TMC2005

TMC2005-JT SMSC | Alldatasheet

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Technical content

Revision 1.0 (01-30-06) DATASHEET TMC2005-JT ARCNET 5 Port HUB Controller

FEATURES

ARCNET HUB Circuit for ARCNET Protocol (Data Rate From 156.25Kbps to 10Mbps) Able to Connect Various Transceivers Directly Device Includes TX/RX Timing Circuit for 5 Port Hub and Direction Control Circuit, Jitter Correct Circuit and Noise Cancel Circuit Easy to Design 8 or 12 Port Hub Can Connect with HYC9088 in Normal Mode Can Connect with RS485 Transceiver, HYC5000/4000/2000, Opt Module and TTL Interface in Backplane Mode Supports both Normal and Backplane Mode at the Same Time for Media Conversion + 5V Single Power GENERAL DESCRIPTION When configuring a network, the maximum number of nodes and the maximum cable length are limited by the electric capacity of the transceiver. In this case, the network is expanded by an equipment called a “HUB” or “repeater”. It maybe necessary to have a converter between coax, T/P and the fiber cable. It is easy to design a HUB or a repeater because the TMC2005 has various features for expanding such network. It can connect with HYC9088, RS485 transceiver, HYC5000/4000/2000 and TTL interface for optical module. It can connect with three different transceivers at the same time and convert the media of each. (The data rate cannot be converted. It is necessary to operate all nodes in the same network at the same data rate). The Hubs can be expanded by connecting two or more TMC2005 chips. By setting one of 5 ports to open-drain output, the Hub can be expanded to either 12 or 16 ports.

ORDERING INFORMATION

Order Number(s): TMC2005-JT for 64 pin TQFP package (green, lead-free)

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 2 SMSC TMC2005-JT DATASHEET

80 Arkay Drive

Hauppauge, NY 11788 (631) 435-6000 FAX (631) 273-3123 Copyright © 2006 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 3 Revision 1.0 (01-30-06) DATASHEET TABLE OF CONTENTS

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 4 SMSC TMC2005-JT DATASHEET PIN CONFIGURATION RXINA0 SA TXENA0 LA MA RXINA1 TXENA1 VDD6 VSS8 RXINB0 SB TXENB0 LB MB RXINB1 VSS5 VSS3 AVSS AGS LP AVDD VDD3 VDD4 VSS4 XTLO XTLI VDD2 nPLLTST RXFLT VSS7 nPULSE1 nPULSE2 nP1BAK VDD5 nCKOEN nRST VSS6 nBJA nBJB nBJE nMBA nMBB nMBE nEXTOD TMC2005-JT TXENB1 HM SE NC LE EXTRX ME VSS1 EXTTX VDD1 CKO VSS2 CKM2 CKM1 CKM0 17 18 19 20 21 22 23 24 25 26 27 28 29 30 64 63 62 NC NC NC NC

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 5 Revision 1.0 (01-30-06) DATASHEET BLOCK DIAGRAM Direction Control Circuit OR Circuit OR Circuit OR Circuit NOT Circuit NOT Circuit NOT Circuit NOT Circuit NOT Circuit NOT Circuit Rx Buffer Output Control Circuit Tx Pulse Gen. DPLL AND Circuit Clock Multiplier PLL TXENA0 TXENA1 TXENB0 TXENB1 EXTTX nP1BAK nPULSE1 nPULSE2 VSS1-8 VDD1-6 C KO nC KO EN RO LP AVSS nPLLTST C KM 2 C KM 1 C KM 0 nRST AVSS AVDD XTLI XTLO RXFLT EXTRX RXINB1 RXINB0 RXINA1 RXINA0 SE SB SA nBJE nBJB nBJA nM BE nM BB nM BA M E M B M A LE LB LA nEXTO D HM

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 6 SMSC TMC2005-JT DATASHEET DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME INPUT/OUTPUT

DESCRIPTION

Port B-1 Tx output to media transceiver HM INPUT Setting for traffic release time (It should be open for normal operation.) Pull-up SE INPUT Port EXT. Polar assignment for EXTRX input (0:active Hi, 1:active Low) Pull-up NC Reserved. It should be open. LE INPUT Port EXT. Polar assignment of EXTTX output (0:active Low, 1:active Hi) Pull-up EXTRX INPUT Port EXT. RX-Data input from media transceiver. Pull-up ME INPUT Port EXT. Output mode assignment of EXTTX (0:pulse output, 1:Tx control output) Pull-up VSS1 Ground EXTTX OUTPUT Port EXT. Output to media transceiver. VDD1 Power Supply CKO OUTPUT Clock Output VSS2 Ground CKM2 INPUT Network speed (data rate) setting. Pull-up CKM1 INPUT Pull-up CKM0 INPUT Pull-up NC Reserved. It should be open. RXFLT INPUT Test Pin. It should be open. Pull-up nPLLTST INPUT Test Pin for PLL.. It should connected to VDD (Set to high) VDD2 Power Supply XTLI INPUT X'tal input/External clock input. XTLO OUTPUT X'tal output VSS4 Ground NC Reserved. It should be open. VDD4 Power Supply VDD3 Power Supply AVDD Analog Power Supply RO OUTPUT VCO output for internal PLL. LP OUTPUT Connection pin to loop filter for internal PLL. AGS INPUT Analog sense pin for internal PLL. AVSS Analog Ground VSS3 Ground VSS5 Ground NC Reserved. It should be open. nEXTOD INPUT Port EXT. Open-drain mode (0:open- drain output, 1:normal output) Pull-up nMBE INPUT Port EXT. Noise cut (0:on, 1:off) Pull-up nMBB INPUT Port A0/A1 Noise cut (0:on, 1:off) Pull-up nMBA INPUT Port B0/B1 Noise cut (0:on, 1:off) Pull-up nBJE INPUT Port EXT. Jitters correct mode (0:big jitters mode, 1:normal mode) Pull-up nBJB INPUT Port A0/A1 Jitters correct mode (0:big jitter mode, 1:normal mode) Pull-up nBJA INPUT Port B0/B1 Jitter correct mode (0:big jitter mode, 1:normal mode) Pull-up VSS6 Ground nRST INPUT Internal reset signal (active Low) Pull-up nCKOEN INPUT Enable of CKO output. Pull-up

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 7 Revision 1.0 (01-30-06) DATASHEET PIN NO. NAME INPUT/OUTPUT Power Supply. nP1BAK OUTPUT nPULSE1 output (for backplane mode). nPULSE2 OUTPUT nPULSE2 output (for normal mode). nPULSE1 OUTPUT nPULSE1 output (for normal mode) VSS7 Ground RXINA0 INPUT Port A-0 Rx-data input from media transceiver. Pull-up SA INPUT Port A. Polar assignment for RXINA0/A1 output (0:active Hi, 1:active Low) Pull-up TXENA0 OUTPUT Port A-0 Tx output to media transceiver. LA INPUT Port A. Polar assignment for TXENA0/A1 output (0:active Low, 1:active Hi) Pull-up RXINA1 INPUT Port A-1 Rx-data input from media transceiver. Pull-up MA INPUT Port A. Mode assignment for TXENA0/A1 (0:pulse output, 1:Tx control output) Pull-up TXENA1 OUTPUT Port A-1 Tx output to media transceiver. VDD6 Power Supply NC Reserved. It should be open. VSS8 Ground RXINB0 INPUT Port B-0 Rx-data input from media transceiver. Pull-up SB INPUT Port B. Polar assignment for RXINA0/A1 input (0:active Hi, 1:Active Low) Pull-up TXENB0 OUTPUT Port B-0 Tx output to media transceiver. LB INPUT Port B. Polar assignment for TXENA0/A1 output (0:active Low, 1:active Hi) Pull-up RXINB1 INPUT Port B-1 Rx-data input from media transceiver. Pull-up MB INPUT Port B. Mode assignment for TXENA0/A1 (0:pulse output, 1:TX control output) Pull-up Note: Pull-up: Input with a pull-up resistor 70KΩ ± 30% TX/RX Interface FEATURE NAME INPUT/OUTPUT RXINA [0:1] RXINB [0:1] EXTRX INPUT Setup the polarity by SA, SB, SE. RX Port Polar Assignment SA, SB, SE INPUT Setup the polarity of RXINA [0:1], RXINB [0:1], EXTTX. 0 : active H 1: active L TX Port TX Control TXENA [0:1] TXENB [0:1] EXTTX OUTPUT TX data pulse (Mx=0) or TX enable signal (Mx=1). Setup TX mode by MA, MB, ME. Setup the polarity by LA, LB, LE TX Port TX Data Output nPULSE [1:2] OUTPUT TX pulse data into HYC9068S- SK/9088S-SK when ARCNET chip is at normal mode. The pulse is always active Low. TX Port nP1BAK OUTPUT TX pulse data into RS485 driver or HYC2485S/2488S when ARCNET chip is at backplane

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 8 SMSC TMC2005-JT DATASHEET FEATURE NAME INPUT/OUTPUT mode. The pulse is always active Low. TX Port Polarity Setup LA, LB, LE INPUT Setup the polarity of TXENA [0:1], TXENB [0:1], EXTTX. 0 : active L 1: active H TX Port Mode Setup MA, MB, ME INPUT Setup the mode of TXENA [0:1], TXENB [0:1], EXTTX. 0: Output TX pulse. (It is equivalent to nTXEN “OR” nP1BAK) 1: Output TX enable Operating Mode Setup FEATURE NAME INPUT/ OUTPUT CKM [0:2] INPUT Terminal to setup the data rate of TMC2005. CKM2 CKM1 CKM0 DIVISOR MULTIPLIER SPEED 0 0 0 16 x1 156.25 Kbps 0 0 1 8 x1 312.5 Kbps 0 1 0 4 x1 625 Kbps 0 1 1 2 x1 1.25 Mbps 1 0 0 1 x1 2.5 Mbps 1 0 1 1 x2 5 Mbps 1 1 0 Reserved Reserved Reserved 1 1 1 1 x4 10 Mbps External clock is 20MHz. Refer to “VARIOUS SETUP” Noise cut mode nMBA nMBB nMBE INPUT 0: Cut off noise from received data 1: Don’t cut off noise Setup “0” normally. Big jitter mode nBJA nBJB nBJE INPUT Setup a jitter filter feature. Select a pulse as reference phase used by DPLL. 0: 2nd pulse (big jitter mode) 1: 1st pulse (normal mode) Open drain mode nEXTOD INPUT Setup a the use of EXTTX port. 0: Set EXTTX as open drain output and use as Ext. 1: Set EXTTX as normal output and use as 5th port. PLL FEATURE NAME INPUT/ OUTPUT Using PLL: Connect to an external condenser “C1” for loop filter. Using no PLL: must be open. RO OUTPUT VCO output Using PLL: Connect to an external resistor “R0” for loop filter. Using no PLL: must be open. AGS INPUT Analog sense input. Using PLL: Connect to loop filter. Using no PLL: Connect to ground.

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 9 Revision 1.0 (01-30-06) DATASHEET FEATURE NAME INPUT/ OUTPUT Test pin for PLL. Must always connect to VDD. AVDD Analog power supply Using PLL: Analog power supply. There are some limits on PCB pattern. Using no PLL: Power supply (+5V) same as VDD1~6. AVSS Analog ground Using PLL: Analog ground. There are some limits on PCB pattern. Using no PLL: Use a ground same as VSS1~8. Other Signals Connect a 20MHz crystal. When supplying an external clock, input the clock to this pin. CRYSTAL INTERFACE XTLO OUTPUT Connect a 20MHz crystal. When supplying an external clock, it must be open. SYSTEM RESET INTERFACE nRST INPUT Reset for initializing TMC2005. (active Low) TEST PIN CKO OUTPUT Output internal clock of TMC2005. TEST PIN nCKOEN INPUT Output control of CKO. 0: Output internal clock on CKO. 1: Always output Low level on CKO. Set “1” Normally. TEST PIN RXFLT INPUT It must be open TEST PIN NC [1:2] It must be open POWER SUPPLY VDD [1:6] Power supply (+5V) GROUND VSS [1:8] Ground

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 10 SMSC TMC2005-JT DATASHEET OPERATIONAL DESCRIPTION Direction Determination All TX ports are set to disable mode in the initial state. When a signal is received from any RX ports, the circuit holds the port on receiving mode (disable TX) and changes the other ports to sending mode (disable RX). One port stays in RX and the rest change into TX after all. The circuit initializes the internal DPLL on the timing of received RX pulse, and the RX buffer circuit stores the RX data and filters its jitter. TX controlling circuit regenerates the stored RX pulse on nPULSE1, nPULSE2 and nP1BAK. The nPULSE1 and nPULSE2 are pulse output pins for transceivers (HYC9088A) of ARCNET normal mode. The nP1BAK is a pulse output pin for transceiver (HYC5000/4000/2000 and RS485 driver) of ARCNET back plane mode. When using optical transceiver, instead of these signals, TXENA [0:1], TXENB [0:1], EXTTX (MA, MB, ME = 0) must be used as TX data inputs of the optical transceiver. Direction Release On ARCNET protocol, each TX message starts with 6-bits of “1” ALERT and each data byte is lead by three bits (1, 1, 0) preamble. To control the HUBs direction, the circuit monitors this bit pattern and holds the state. If the end of the bit pattern comes, all TX ports return receiving mode (disable TX) again. The interval timer detects the end of the bit pattern. During data is on line, silent period is less than 4 uS* because at least one bit “1” among 10-bits is received while receiving the data. The minimum silent interval from the end of received data to the alert of the next data (the minimum time of changing the direction) is the chip turn around time (12.6 uS*) of ARCNET controller. The interval timer to detect the data end is set to 5.6uS by adding some margin to the above interval for neglecting the reflection on a cable. [Note] Numbers marked * are at 2.5Mbps operation. Jitter Filter To build a network with transceivers that introduce big jitter like ones for optical fiber, the old HUB that has direction control only may cause a transmission error because jitters on each HUB are added when several HUBs were connected in serial. The TMC2005 fixes that problem with jitter filtering and wave shaping through the following three steps. Input Sampling The TMC2005 samples a data on a network by eight times clock of the network data. Jitter Filtering (DPLL) The TMC2005 filters the jitter (± 100nS at 2.5Mbps) of network data sampled by 8X clock through the internal digital PLL and stores the data into the buffer. Wave Shaping Output The TMC2005 re-synchronizes and regenerates the network data at the same clock as the data rate. The capability of the jitter filtering is shown below. DATA RATE CAPABILITY OF JITTER FILTERING 10Mbps ± 25nS 5Mbps ± 50nS 2.5Mbps ± 100nS 1.25Mbps ± 200nS 625Kbps ± 400nS 312.5Kbps ± 800nS 156.25Kbps ± 1.6uS

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 11 Revision 1.0 (01-30-06) DATASHEET Option Feature for Jitter Filtering When any RX ports receive the bigger jitter than its allowance, the TMC2005 may fail to receive the data correctly and the network may be down.. However the below method to escape is effective for the case that a momentary big jitter occurs under a special condition like an optical transceiver. Big jitter (BJ) mode The reference phase of the internal DPLL is changed from the first pulse to the second pulse by setting “0” to the big jitter mode pins (nBJX). This setup is effective for the case that a big jitter occurs when rising up from DC state as same as when using an optical transceiver with ATC function (refer to complement). Note: The delay time of the TMC2005 becomes 400nS (at 2.5Mbps) longer than the normal mode. The delay time limits the maximum cable length and maximum node number. [Complement] The big jitter may occur in the case of using an optical transceiver, especially an optical receiver that has an ATC circuit that controls threshold level in proportion to received light strength. The first pulse especially after long time idle has the big jitter but the second pulse is stabilized. Changing polar of RX port In order to filter the jitter of edge in one side, it is effective to set reverse to pin SA, SB, SE to change the polarity of RX port. Note: Changing the polarity of RX port makes the delay time of the TMC2005 circuit a half bit (200nS) longer than original 2.5Mbps, and the delay time affects the maximum cable length and maximum node number. Option Feature for Noise Cut mode The Noise cut mode is enabled by setting pin nMBx sets 0. The noise cut mode is a function to remove the ringing noise and the reflection noise generated on the leading edge side of the input pulse to receive data input RXINx. The position and the width of the “dead band” are shown in the figure below. - Dead band at Normal mode (nMBx=1) - Dead band at Noise cut mode (nMBx=0) Tdr/8 = 1 clock Tdr/8 = 1 clock RXIN RXIN dead band: Noise cut band RXIN edge reference position: Generated by adjacent phase of SYNC character (1,1,0) Period of data rate (Tdr) Ideal waveform (Active High) RXIN edge reference position: Generated by adjacent phase of SYNC character (1,1,0) Ideal waveform Period of data rate (Tdr) dead band (Active High)

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 12 SMSC TMC2005-JT DATASHEET APPLICATION NOTES Example 1: A five ports HUB with HYC4000s in backplane mode. FIGURE 1 - APPLICATION EXAMPLE Only the TMC2005 and five transceivers are indicated in the above figure. Connect the other pins adequately.

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 13 Revision 1.0 (01-30-06) DATASHEET Example 2: A five ports HUB with HYC9088s and a optical transceiver(TODX270A) links the two physical layers; dipulse and fiber optics. FIGURE 2 - APPLICATION EXAMPLE 2 Only the TMC2005 and five transceivers are indicated in the above figure. Connect the other pins adequately.

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 14 SMSC TMC2005-JT DATASHEET Example 3: A five ports HUB with two optical transceivers, two HYC9088s, and a HYC4000 links three physical layers; fiber optics, dipulse, and AC-485. FIGURE 3 - APPLICATION EXAMPLE 3 Only the TMC2005 and five transceivers are indicated in the figure above. Connect the other pins properly.

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 15 Revision 1.0 (01-30-06) DATASHEET Example 4: An on-board type HUB with a COM20020 and four optical transceivers in backplane mode. FIGURE 4 - APPLICATION EXAMPLE 4 Only the TMC2005 and four transceivers with the COM20020 are indicated in the above figure. Connect the other pins adequately.

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 16 SMSC TMC2005-JT DATASHEET Example 5: An on-board type HUB with a COM20020 and four RS485 transceivers. FIGURE 5 - APPLICATION EXAMPLE 5 Only the TMC2005 and four transceivers with the COM20020 are indicated in the above figure. Connect the other pins adequately.

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 17 Revision 1.0 (01-30-06) DATASHEET Example 6: An on-board type HUB with a COM20020, two HYC4000s, and two HYC9088s links two different physical layers; dipulse and AC-485. FIGURE 6 - APPLICATION EXAMPLE 6 Only the TMC2005 and four transceivers with the COM20020 are indicated in the above figure. Connect the other pins adequately.

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 18 SMSC TMC2005-JT DATASHEET Example 7: An eight ports HUB are composed by using two TMC2005. Two TMC2005 connects the EXTTX signal with the EXTRX signal. FIGURE 7 - APPLICATION EXAMPLE 7 Only the two TMC2005s are indicated in the above figure. Connect the other pins adequately.

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 19 Revision 1.0 (01-30-06) DATASHEET Example 8: A sixteen ports HUB are composed by using four TMC2005. The EXT port between TMC2005 is made an open-drain mode and it connects it (left example). Or put standard logic IC such as 74LS22 outside (right example). This connected method is excellent in noised respect compared with connected method of open-drain mode. FIGURE 8 - APPLICATION EXAMPLE 8 Only the four TMC2005s are indicated in the above figure. Connect the other pins adequately. Note: Use the wiring pattern length that connects between four TMC2005s by five inches or less in open-drain mode. Four TMC2005s is maximum in open-drain mode. Data rate: 5Mbps and below Data rate: 10Mbps and below or

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 20 SMSC TMC2005-JT DATASHEET PORT GROUP The five ports can be divided into three groups (group A: two ports, group B: two ports, extension port: one port) and each group can select TX/RX polar, noise cut mode, and big jitter mode respectively. Select pins for each group are as follows: FUNCTION GROUP A GROUP B EXTENSION RECEIVE RXINA0, 1 RXINB0, 1 EXTRX TRANSMIT TXENA0, 1 TXENB0, 1 EXTTX RX POLARITY SA SB SE TX POLARITY LA LB LE TX CONTROL MA MB ME NOISE CUT nMBA nMBB nMBE BIG JITTER nBJA nBJB nBJE EXTENSION nEXTOD Various Setup Example For Operation Mode Setup To Each Port SA, SB, SE LA, LB, LE MA, MB, ME RX POLAR TX POLAR TRANSCEIVER Active Low Active Low HYC2485S/HYC2488S Active High Active High Optical Transceiver Active High Active Low HYC9088/HYC9068 Active Low Active High RS485 Transceiver Note for Unused port Unused ports can be left open because RX port (RX input), RX polar (S input), TX polar (L input), TX control (M input) pins have internal pull-up resistors. Because of internal pull-up resistors, select pins for noise cut (nMB input), big jitter (nBJ input) can be left open when used for setting “OFF”. Example for Power-On Reset Circuit FIGURE 9 - POWER-ON RESET

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 21 Revision 1.0 (01-30-06) DATASHEET CONNECTING THE TMC2005 WITH INTERNAL PLL When using the TMC2005 at data rate 2.5Mbps or lower, it is not necessary to use internal PLL. Leave the loop filter pins (RO, LP) open and connect AGS to the Ground. The pins for the analog power supply (AVSS, AVDD) may connect to digital power supply. When using the TMC2005 at data rate 5Mbps or higher, the internal PLL has to be used as a clock multiplier. PCB layout must follow the guidelines at Figure 10, refer to Notes 1 through 5. FIGURE 10 - PLL PATTERN LAYOUT Note 1: Prohibit the patterns for LP and RO from occupying the area of digital power supply. Use the area of analog power supply between VAA and AVSS. Note 2: Encircle the pattern between LP, RO and AGS with wide pattern of analog ground. Note 3: Connect the analog power supply “VAA” with 0.1 uF condenser (a) with in 1/8 inch (~ 3.2mm) from VAA pin. Note 4: In order to filter the jitter of low frequency, connect a 10 uF condenser (b) in parallel with the condenser (a). Note 5: Place 0.1 uF bypass condenser (c) within ¼ inch (~ 6.4mm) from VDD3 and VSS3. Connect the ground side of a condenser (c) at the place (*) where AVSS returns to GND plane.

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 22 SMSC TMC2005-JT DATASHEET Method To Connect A Crystal Clock Connect with external parts as follows: FIGURE 11 - CONNECTING THE CRYSTAL CLOCK Note 1: When designing a printed circuit board, keep the patterns as short as possible and don’t cross with other patterns. Note 2: When using an external clock like an oscillator module, connect it to XTLI pin and leave XTLO pin open. When designing a printed circuit board, wire between XTLI pin and oscillator should be short as possible. nPLLTST pin nPLLTST must be connect toVDD. The rest of input pins have pull-up resistors built in, but nPLLTST pin does not have the pull-up resistor. Clock signal cannot ditributed into the TMC2005 if nPLLTST pin is connected GND or is left open.

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 23 Revision 1.0 (01-30-06) DATASHEET CASCADING CONNECTION HUBs can be connected in cascade by using the ports as Fig. 12. In the case of cascade connection, it is necessary to consider how many HUBs can exist in serial. The maximum delay between input port and output port is 650ns @2.5Mbps at the TMC2005. It is equivalent to the propagation delay when a cable length is 135m. For example, if every cable length is 10m in Figure 12, the longest distance is physically 50m but it is electrically 590m because of multiplying 10m by 5 and 135m by 4, and the total propagation delay becomes 2.8uS. For analyzing the network timing, consider the delay caused by HUBs. In the ARCNET protocol, it is defined that the longest distance between nodes is the maximum 6.4Km. For example, if 20 TMC2005s exist between nodes in the longest distance, the actual cable length is 3.7Km because of deducting 135m by 20 in converting to cable length from 6.4Km. FIGURE 12 - CASCADE CONNECTION OF 4 HUBS Two examples of eight ports HUBs using two TMC2005s are shown in Fig. 13 and 14. If connecting as in Fig. 13, eight TMC2005s exist between the nodes at both far ends. On the other hand, when assigning two ports for cascading connection to the same TMC2005, the number of TMC2005 in serial connection can be down to the number of HUBs plus two, which can reduce the propagation delay. TMC2005 Port 5 Port 4 Port 3 Port 2 Port 1 TMC2005 Port 5 Port 4 Port 3 Port 2 Port 1 TMC2005 Port 5 Port 4 Port 3 Port 2 Port 1 TMC2005 Port 5 Port 4 Port 3 Port 2 Port 1 NODE NODE

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 25 Revision 1.0 (01-30-06) DATASHEET Fig.15 shows a 16 ports HUB with four TMC2005s connected by open–drain ports. When assigning two ports for cascade connection to the same TMC2005, the number of TMC2005s for serial connection can be reduced to the number of HUBs plus two. FIGURE 15 - CASCADE CONNECTION OF 16 PORT HUB Note: When connecting TMC2005 by open-drain output on a board, connecting TMC2005s must be four or less, and the data rate must be 5Mbps or slower. The pattern of open-drain output has to be as short as possible (less than 15cm). NODE NODE TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 TMC2005 HUB2 HUB 3 HUB 1 HUB 4

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 26 SMSC TMC2005-JT DATASHEET Ring Network With the TMC2005 The reliability of the network can be improved by connecting every node in a ring, because the communication is maintained through the reverse route even if the cable is cut at a point. However ARCNET controller alone can not support ring, because ARCNET is a half-duplex communication system. Using HUBs makes possible for ARCNET to built a ring network as in Fig.16. This configuration is available only for using fiber optics. (Refer to the application note for details.) FIGURE 16 - RING CONFIGURATION Note 1: Noise may cause an endless loop in a ring system, and the network may hang up. Therefore take care of designing the patterns between TMC2005 and transceiver or cabling of system. Example for system hang-up A noise occurs only at “A” point in Figure 16. The noise propagates clockwise on the network. TMC2005 detects the noise that came back through the ring. The noise causes an endless loop in the ring. Example for no hang-up Any noise occurs at “A” and “B” points in Figure 16 at the same time. The noise propagates to both directions in the network. An endless loop doesn’t occur because TMC2005s in the middle absorb the noise from both sides. Note 2: Place a watch dog timer on one of the TMC2005 in at least one ring. To protect from hang-up the detecting time of the watch dog timer should be set to longer than 2.7 mS (@ 2.5Mbps) that is the burst time in the ARCNET protocol. Note 3: Consider that a total of each segment delay time (cable delay, TMC2005 delay, driver delay and receiver delay) between HUBs in a network is less than 5.6uS (@ 2.5Mbps). The maxmimum distance between HUBs is approximiately 1000m (@ 2.5Mbps). TMC2005 COM20020 nRESET CK CT TMC2005 COM20020 TMC2005 COM20020 TMC2005 COM20020 Optical Fiber A B Optical Transceiver TXEN of any port TXEN nRST

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 27 Revision 1.0 (01-30-06) DATASHEET OPERATIONAL DESCRIPTION MAXIMUM GUARANTEED RATINGS* Stresses above those listed may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other condition above those indicated in the operational sections of this specification is not implied. (Note) When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes or “glitches” on their output when the AC power is switch on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists it is suggested that a clamp circuit be used. Vss = 0V ITEM SYMBOL RATING UNIT POWER SUPPLY VOLTAGE VDD -0.3 +7.0 V INPUT VOLTAGE VIN -0.3 VDD +0.3 V OUTPUT VOLTAGE VOUT -0.3 VDD +0.3 V AMBIENT TEMPERATURE Tstg -40 +125 STANDARD OPERATING CONDITION Vss = 0V ITEM SYMBOL RATING UNIT POWER SUPPLY VOLTAGE VDD 4.5 – 5.5 V AMBIENT TEMPERATURE Ta 0 - +85 DC CHARACTERISTIC - INPUT PIN SYMBOL ITEM CONDITION MIN MAX UNIT XTLI, nPLLTST 3.5 V VIH High Level Input Voltage Others 2.2 V VIL Low Level Input Voltage 0.8 V IIH High Level Input Current VIN=VDD -10 uA IIL Low Level Input Current VIN=VSS -10 uA IIL With pull-up Vin=VSS -200 -10 uA IOZ Output Leak Current VOUT=VDD or VSS -10 uA IDD Dissipation Current Operating 100 mA

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 28 SMSC TMC2005-JT DATASHEET DC CHARACTERISTIC - OUTPUT PIN SYMBOL ITEM CONDITION MIN MAX UNIT PIN VOH High Level Output Voltage IOH=-4mA 2.4 V 1,9,46,51, 55,61 VOH High Level Output Voltage IOH=-8mA 2.4 V 11,45,47 VOL Low Level Output Voltage IOL=4mA 0.4 V 1,9,46,51, 55,61 VOL Low Level Output Voltage IOL=8mA 0.4 V 11,45,47 AC CHARACTERISTIC - CLOCK and RESET ITEM SYMBOL MIN TYP MAX UNIT CONDITION Generating Static Time tx mS Clock Cycle tCYC nS Note 1 Clock Frequency Deflection tCDF -100 100 ppm Note 1 Clock Pulse Width tCW nS Note 1 Reset Pulse Width ttRSW 200 nS Note 1 Note 1: Use only F=20MHz Note 2: VDD=4.5V FIGURE 17 - CLOCK AND RESET XTLI tCW tCYC tCW nRST tRSW

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 29 Revision 1.0 (01-30-06) DATASHEET AC CHARACTERISTIC – Rx waveforms and Tx waveforms FIGURE 18 - RX WAVEFORMS AND TX WAVEFORMS ITEMS MARK MIN TYP MAX UNIT REMARK RXIN Low Pulse Width nS RXIN High Pulse Width nS Tdr RXIN Period (400) nS (Value at 2.5Mbps) 2/8Tdr 3/8Tdr+50 RXIN First Active Edge to TXEN Active (100) (200) nS Note1 (Value at 2.5Mbps) 111/8Tdr 112/8Tdr+50 RXIN Last Active Edge to TXEN Inactive (5,550) (5,650) nS Note1 (Value at 2.5Mbps) 9/8Tdr 10/8Tdr+50 RXIN First Active Edge to nP1BAK/TXEN First Active Edge (450) (550) nS Note2, Note3 (Value at 2.5Mbps) 1/2Tdr nP1BAK/TXEN Low Pulse Width (200) nS Note2 (Value at 2.5Mbps) 1/2Tdr nP1BAK/TXEN High Pulse Width (200) nS Note2 (Value at 2.5Mbps) Tdr nP1BAK/TXEN Period (400) nS Note2 (Value at 2.5Mbps) 5/8Tdr 9/8Tdr+50 14/8Tdr+50 RXIN Active Edge to nP1BAK/TXEN Active Edge (Except First Edge of RXIN) t10 (250) (500) (750) nS Note2, Note3 (Value at 2.5Mbps) RXINx (S=1) TXENy (M=1, L=0) nP1BAK /TXENy (M=0, L=0) nPULSE1 nPULSE2 t10 t11 t12 t13 t14 t15 t16 t17 t18 t19 * 4 ports except received port (Received port) * 4 ports except received port

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 30 SMSC TMC2005-JT DATASHEET ITEMS MARK MIN TYP MAX UNIT REMARK 9/8Tdr 10/8Tdr+50 RXIN First Active Edge to nPULSE1 First Active Edge t11 (450) (550) nS Note3 (Value at 2.5Mbps) 1/4Tdr nPULSE1 Low Pulse Width t12 (100) nS (Value at 2.5Mbps) 3/4Tdr nPULSE1 High Pulse Width t13 (300) nS (Value at 2.5Mbps) Tdr nPULSE1 Period t14 (400) nS (Value at 2.5Mbps) 5/8Tdr 9/8Tdr+50 14/8Tdr+50 RXIN Active Edge to nPULSE1 Active Edge (Except First Edge of RXIN) t15 (250) (500) (750) nS Note3 (Value at 2.5Mbps) nPULSE1 to nPULSE2 Overlap t16 -10 +10 nS 1/4Tdr nPULSE2 Low Pulse Width t17 (100) nS (Value at 2.5Mbps) 3/4Tdr nPULSE2 High Pulse Width t18 (300) nS (Value at 2.5Mbps) Tdr nPULSE2 Period t19 (400) nS (Value at 2.5Mbps) Tdr: Period of data rate, ex) Tdr=400nS at 2.5Mbps Note1: Applied to TXENx which is set to Mx=1. (Tx Control mode) Note2: Applied to TXENx which is set to Mx=0. (Pulse output mode) Note3: Extra one “Tdr” time to be added at RXINx is set to nBJx=0. (Big Jitter mode)

ARCNET 5 Port HUB Controller Datasheet SMSC TMC2005-JT Page 31 Revision 1.0 (01-30-06) DATASHEET TMC2005-JT 64 PIN TQFP PACKAGE OUTLINE Zd Ze E1 E D SYMBOL MIN (mm) TYP (mm) MAX (mm) D 11.8 12.0 12.2 9.9 10.0 10.1 E 11.8 12.0 12.2 9.9 10.0 10.1 Ze 1.25 typ Zd 1.25 typ

ARCNET 5 Port HUB Controller Datasheet Revision 1.0 (01-30-06) Page 32 SMSC TMC2005-JT DATASHEET SYMBOL MIN (mm) TYP (mm) MAX (mm) A 1.6 0.95 0.1 0.15 1.35 1.4 1.45 B 0.17 0.22 0.27 E

0.5 BSC

0.08 bbb 0.08 SYMBOL MIN (mm) TYP (mm) MAX (mm) c 0.9 0.145 0.2 L 0.45 0.6 0.75 A e b bbb M aaa c L