SP322

SP322 SIPEX | Alldatasheet

Document overview

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Technical content

■ +5V Only Operation ■ Programmable V.11 or V.35 Selection ■ Three Differential V.11 Transceivers in V.11 Mode ■ Three Differential V.35 Transceivers in V.35 Mode ■ No External Resistor Termination for Compliant V.35 Operation ■ V.11 Cable Termination (approx. 120Ω) Internally Configured in V.11 Mode ■ Tri-State capability on drivers and receivers ■ Ideal low cost solution for X.25 or Frame Relay Serial Ports

DESCRIPTION

The SP322 is a programmable V.11 or V.35 transceiver IC. The SP322 contains three drivers and three receivers when selected in each mode. The selection is done by the V.11/V.35 select pin. The V.11 transceivers can typically operate at 10Mbps while adhering to the ITU V.11 specifications. The V.35 transceivers can operate up to 10Mbps while adhering to the ITU V.35 specifications. The SP322 contains internal resistor termination for compliant V.35 operation as well as the V.11 termination on the receiver inputs for optional cable termination. Each SP322 driver contains a control pin which disables the output and places the output pins in a high impedance state. Each receiver also has a control pin which places the receiver outputs in a high impedance state. The enable pins will disconnect the internal termination network for whichever mode the SP322 is selected. For the receivers, the enable pin will place the input pins in a high impedance (approx. 15kΩ). This allows for convenient DTE-DCE configuration by connecting the driver outputs to the receiver inputs, thus allowing the enable pins to select the desired DTE or DCE operation. SP322 Programmable V.11/V.35 Transceiver EIA-530 WAN V.35

Rev. 7/9/03 SP322 V.11/V.35 Serial Transceiver © Copyright 2003 Sipex Corporation SPECIFICATIONS Typically 25°C @ Vcc = +5V unless otherwise noted. MIN. TYP. MAX. UNITS CONDITIONS LOGIC INPUTS VIL 0.8 Volts VIH 2.0 Volts LOGIC OUTPUTS VOL 0.4 Volts I OUT = -3.2mA VOH 2.4 Volts I OUT = 1.0mA V.35 DRIVER DC Characteristics Outputs Test Terminated Voltage±0.44 ±0.55 ±0.66 Volts per Figure 10 Source Impedance 50 100 150 Ω per Figure 11 Short Circuit Impedance 135 150 165 Ω per Figure 12 Offset ±0.6 Volts per Figure 10 AC Characteristics Outputs Transition Time 40 ns per Figure 13; 10% to 90% Propagation Delay t PHL 40 70 100 ns per Figures 18 and 19 tPLH 40 70 100 ns per Figures 18 and 19 Max. Transmission Rate 10 Mbps per Figures 18 and 19 V.35 RECEIVER DC Characteristics Inputs Input Sensitivity +80 mV Input Impedance 90 100 110 Ω per Figure 14 Short Circuit Impedance 135 150 165 Ω per Figure 15 AC Characteristics Inputs Propagation Delay t PHL 50 100 150 ns per Figures 18 and 21 tPLH 50 100 150 ns per Figures 18 and 21 Max. Transmission Rate 10 Mbps per Figure 18 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. V Power Dissipation Package Derating: 44-pin Plastic QFP ø

V.11 DRIVER DC Characteristics Outputs Open Circuit Voltage ±6.0 Volts per Figure 1 Test Terminated Voltage ±2.0 ±5.0 Volts per Figure 2 0.5VOC 0.67VOC Volts Balance ±0.4 Volts per Figure 2 Offset ±3.0 Volts per Figure 2 Short-Circuit Current ±150 mA per Figure 3 Power-Off Current ±100 µA per Figure 5 AC Characteristics VCC = +5V for AC parameters Outputs Transition Time 20 ns per Figure 4; 10% to 90% Propagation Delay Using C L=50pF tPHL 50 80 100 ns per Figures 18 and 19 tPLH 50 80 100 ns per Figures 18 and 19 Differential Skew 20 40 ns per Figures 18 and 19 Max. Transmission Rate 10 Mbps V.11 RECEIVER DC Characteristics Inputs Common Mode Range –7 +7 Volts Sensitivity ±0.3 Volts Input Current ±3.25 mA per Figures 6 and 7 Current w/ 100Ω Term. ±60.75 mA per Figures 8 and 9 AC Characteristics VCC = +5V for AC parameters Inputs Propagation Delay Using C L=50pF tPHL 50 110 150 ns per Figures 18 and 21 tPLH 50 110 150 ns per Figures 18 and 21 Differential Skew 20 ns per Figure 18 Max. Transmission Rate 10 Mbps ENABLE TIMING Driver Enable Time See Figures 16 and 20 Enable to Low 90 500 ns C L=15pF, S1 Closed Enable to High 90 500 ns C L=15pF, S2 Closed Disable Time See Figures 16 and 20 Disable From Low 90 500 ns C L=15pF, S1 Closed Disable From High 90 500 ns C L=15pF, S2 Closed Receiver Enable Time See Figures 17 and 22 Enable to Low 90 500 ns C L=15pF, S1 Closed Enable to High 90 500 ns C L=15pF, S2 Closed Disable Time See Figures 17 and 22 Disable From Low 90 500 ns C L=15pF, S1 Closed Disable From High 90 500 ns C L=15pF, S2 Closed POWER REQUIREMENTS Supply Voltage VCC +4.75 +5.25 Volts Supply Current ICC Shutdown 4 µA V.35 Mode 45 mA Driver outputs loaded with 100 Ω V.11 Mode 95 mA Driver outputs loaded with 100 Ω SPECIFICATIONS Typically 25°C @ Vcc = +5V unless otherwise noted. MIN. TYP. MAX. UNITS CONDITIONS

Rev. 7/9/03 SP322 V.11/V.35 Serial Transceiver © Copyright 2003 Sipex Corporation THEORY OF OPERATION The SP322 is a programmable V.11 or V.35 transceiver IC. It contains three driver and three receivers which can be configured to either V.11 or V.35 physical layer electrical characteristics. The transceivers within the SP322 include all the necessary termination resistor networks required for compliant V.11 and V.35 signals. This simplifies serial port designs using V.11 or V.35 where the engineer does not have to configure V.11 cable termination resistors and the V.35 network. The SP322 contains four basic blocks: the charge pump, differential drivers, differential receivers, termination network circuitry. Each block is described in the following. Charge–Pump The SP322 charge pump is smaller version of the Sipex–patented design (U.S. 5,306,954). The charge pump still requires four external capacitors and uses a four–phase voltage shift- ing technique to attain symmetrical 10V power supplies. But the pump is only used for provid- ing internal biasing for the transceivers and the termination circuitry. The V DD and VSS outputs provide only 3mA of output current and should not be connected to bias other external circuitry. Recommended charge pump capacitor values are 1µF or greater. The internal oscillator pro- vides a clock rate for the charge pump which typically operates at 15kHz. Drivers The SP322 has three differential drivers. There are two types of drivers includes within the SP322 : V.11 drivers and V.35 drivers. When configured in V.11 mode, the V.11 driv- ers produce a differential output compliant with the V.11 and RS-422 electrical specifications. This includes the all the DC electrical param- eters such as V OC, VT, VOS, etc. The strength of the SP322 drivers allow them to also drive signals per the RS-485 standard. The V T mini- mum of ±1.5V is provided by the driver output given a load of 54Ω as opposed to ±2.0V with a 100Ω load for RS-422. However, the drivers are not intended to operate over the RS-485 com- mon mode range of +12V to -7V. The common mode range for the V.11 drivers is +7V to -7V which is in accordance to the ITU V.11 specifi- cation. When in V.35 mode, the drivers provide V.35 signals compliant to the ITU V.35 electrical specification. Specifically, the V.35 driver is designed to supply a differential output of ±0.55V with an offset of less than 0.6V. With Sipex's patent-pending V.35 driver design, the driver also adheres to impedance measurements such as driver output source impedance (100Ω ±50Ω) and driver output short-circuit impedance (150Ω ±15Ω). Traditional V.35 drivers require a resis- tor network to provide the proper V.35 imped- ance specifications for the driver outputs. The SP322 V.35 driver does this without the aid of any external components attached to the driver output. Its unique design contains internal resistance matching and switching to provide compliant V.35 signals. Each driver includes an enable pin for added convenience. The driver enable pins are low active and will tri-state the driver outputs if a logic "1" is applied. During this state, the drivers are high impedance. The enable pins include a pull-down resistor so that the pin can be unconnected where the driver will always be enabled. Regardless of physical protocol, the drivers can operate to at least 10Mbps. Receivers The SP322 has three differential receivers which are used for either V.11 or V.35. The receivers have a 200mV sensitivity and operate over the common mode range of +7V to -7V. The receiver itself is the same in either V.11 or V.35 mode. The receiver input termination is config- ured differently for each mode (V.11/V.35 pin). The receivers also include enable pins for con- venience. The receiver enable pins are high active where a logic "0" will tri-state the re- ceiver outputs. During tri-state, the receiver inputs are approximately 12k Ω. Any termina- tion associated with the operating mode is dis- connected during tri-state of that receiver. The receiver enable pins have a pull-up resistor that allows the pins to be unconnected. The receiver will always be active in this case. The differen- tial receiver can operate to at least 10Mbps.

Unique to Sipex, the SP322 provides internal resistor networks for V.35 as well as the cable termination for V.11. The resistor network for the V.35 receivers are configured as a typical V.35 receiver using two 51Ω resistors in series tied to the A and B inputs with a 124Ω center-tap resistor to ground. The network is internally switched on during V.35 mode (V.11/V.35 = V CC) using high performance, low r ON transis- tors. The transistors can operate efficiently over +7V to -7V, and can tolerate over +10V to -10V without damage. This termination provides the proper V.35 receiver input impedance of 100Ω and short-circuit impedance at 2V of 150Ω with 10% accuracy. The configuration for the V.11 receiver input resistor network is similar to the V.35 network except that the 124 Ω resistor is disconnected (V.11/V.35 = 0V). A series resistor is also added increase the input impedance to over 120Ω for the V.11 cable termination. The minimum resistance per the ITU V.11 specifica- tion is 100 Ω. The V.11 termination can be switched off using the V.11_TERM pin. For a terminated V.11 receiver, this pin is at a logic "1". A logic "0" will inform the switches to disconnect the V.11 termination. Shutdown The SP322 includes a shutdown pin (SD) which disables the charge pump and all power con- suming circuitry to provide low I CC. A logic "1" to the SD pin will shut down the SP322 where it will draw less than 20µA of current. NET1/2 European Compliancy As with all of Sipex's previous multi-protocol transceiver ICs, the SP322 drivers and receivers have been designed to meet all electrical specifications for ITU V.11 and V.35. Furthermore, it is internally tested and will pass the NET1/2 physical layer testing requirements. Please note that although the SP322 adheres to NET1/2 testing, any complex or unusual configuration should be double-checked to ensure NET compliance. Consult factory for details. Applications Information The SP322 is designed for serial port applica- tions needing V.11 and V.35 transceivers. The SP322 supports a variety of physical layer protocols such as EIA-530, EIA-530A, RS-449, and V.36 where V.11 transceivers are used for clock and data signals. The termination resistors are recommended for crosstalk and reflections elimination under higher speed operation. Internal termination solves many headaches and configuration hassles with implementing V.11 and V.35. The SP322 provides a simple, low- cost solution for the clock and data lines for synchronous serial ports. The handshaking lines such as CTS, DTR, etc. can be implemented using discrete RS-422 or RS-232 transceivers, depending on the mode supported. Sipex supplies either differential (V.11) or single- ended (V.28) discrete transceiver products to mate with the SP322 .

Rev. 7/9/03 SP322 V.11/V.35 Serial Transceiver © Copyright 2003 Sipex Corporation

44 PIN MQFP (MS-022 BC)

5°-16° 0° MIN. 0°–7° 5°-16° L 0.30" RAD. TYP . 0.20" RAD. TYP . c D CL CL -B- -D- -A- E e Seating PlaneA1 AA b DIMENSIONS Minimum/Maximum (mm) SYMBOL A b D E e N 44–PIN MQFP JEDEC MS-022 (AB) Variation MIN NOM MAX 2.45 0.00 0.25 1.80 2.00 2.20 0.29 0.45

13.20 BSC

10.00 BSC

8.00 REF

0.80 BSC

c 0.11 23.00 L 0.73 0.88 1.03 L1 1.60 BASIC PACKAGE: 44 Pin MQFP

44 PIN LQFP

L 11° - 13° 0° Min 11° - 13° 0°–7° DIMENSIONS Minimum/Maximum (mm) SYMBOL A b D e E N 44–PIN LQFP JEDEC MS-026 (BCB) Variation MIN NOM MAX 1.60 0.05 0.15 1.35 1.40 1.45 0.30 0.37 0.50

12.00 BSC

c b e COMMON DIMENTIONS SYMBL MIN NOM MAX c 0.11 23.00 L 0.45 0.60 0.75 L1 1.00 BASIC 0.2 RAD. MAX. 0.08 RAD. MIN. Seating PlaneA1 AA D 1 D CL CL -D- Pin 1 E PACKAGE: 44 Pin LQFP

Rev. 7/9/03 SP322 V.11/V.35 Serial Transceiver © Copyright 2003 Sipex Corporation

ORDERING INFORMATION

Model Temperature Range Package Types Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office

233 South Hillview Drive

Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office

22 Linnell Circle

Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Please consult the factory for pricing and availability on a Tape-On-Reel option.