SN65ALS1176 TI | Alldatasheet
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DIFFERENTIAL BUS TRANSCEIVER SLLS295A – APRIL 1998 – REVISED DECEMBER 1999 1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 /C0068Meets or Exceeds the Requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendations V.11 and X.27 /C0068Recommended for PROFIBUS Applications /C0068Operates at Data Rates up to 35 MBaud /C0068Operating Temperature Range ...– 2 5°C to 85°C /C0068Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments /C0068Low Supply-Current Requirement . . . 30 mA Max /C0068Wide Positive and Negative Input/Output Bus-Voltage Ranges /C0068Thermal-Shutdown Protection /C0068Driver Positive- and Negative-Current Limiting /C0068Receiver Input Hysteresis /C0068Glitch-Free Power-Up and Power-Down Protection /C0068Receiver Open-Circuit Fail-Safe Design /C0068Package Options Include Plastic Small-Outline (D) Package and (P) DIPs
description
The SN65ALS1176 differential bus transceiver is designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and meets TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendations V.11 and X.27. The SN65ALS1176 combines a 3-state differential line driver and a differential input line receiver, both of which operate from a single 5-V power supply. The driver and receiver have active-high and active-low enables, respectively, that can be connected together externally to function as a direction control. The driver differential outputs and the receiver differential inputs are connected internally to form a differential input/output (I/O) bus port that is designed to offer minimum loading to the bus when the driver is disabled or V CC = 0. This port features wide positive and negative common-mode voltage ranges, making the device suitable for party-line applications. The SN65ALS1176 is characterized for operation from –25°C to 85°C. Copyright 1999, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. R RE DE D VCC B A GND D † OR P PACKAGE (TOP VIEW) † The D package is available taped and reeled. Add the suffix R to the device type (e.g., SN65ALS1176DR).
DIFFERENTIAL BUS TRANSCEIVER SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
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DIFFERENTIAL INPUTS ENABLE OUTPUT A–B RE R VID ≥ 0.2 V L H –0.2 V < VID < 0.2 V L ? VID ≤ –0.2 V L L X H Z Inputs open L H H = high level, L = low level, X = irrelevant, ? = Indeterminate, Z = high impedance (off) logic symbol† R D RE DE EN2 EN1 B A † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. logic diagram (positive logic) Bus B A 2RE 3DE
DIFFERENTIAL BUS TRANSCEIVER SLLS295A – APRIL 1998 – REVISED DECEMBER 1999 3POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 schematics of inputs and outputs EQUIVALENT OF EACH INPUT Driver Input: R(eq) = 3 kW NOM Enable Inputs: R(eq) = 8 kW NOM R (eq) = equivalent resistor TYPICAL OF A AND B I/O PORTS TYPICAL OF RECEIVER OUTPUT Output 85 W NOM VCC 180 kW NOM Connected on B Port 1.1 kW NOM 3 kW NOM 18 kW NOM Connected on A Port 180 kW NOM A or B R (eq) VCC Input VCC absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. All voltage values, except differential I/O bus voltage, are with respect to network ground terminal. 2. The package thermal impedance is calculated in accordance with JESD 51. recommended operating conditions MIN NOM MAX UNIT Supply voltage, VCC 4.75 5 5.25 V Input voltage at any bus terminal (separately or common mode) VIor VIC VInput voltage at any bus terminal (separately or common mode), VI or VIC –7 V High-level input voltage, VIH D, DE, and RE 2 V Low-level input voltage, VIL D, DE, and RE 0.8 V Differential input voltage, VID (see Note 3) ± 12 V High level output current IOH Driver –60 mA High-level output current, IOH Receiver –400 mA Low level output current IOL Driver 60 mALow-level output current, IOL Receiver 8 mA Operating free-air temperature, TA –25 85 °C NOTE 3: Differential input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
DIFFERENTIAL BUS TRANSCEIVER SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
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electrical characteristics over recommended ranges of supply voltage and operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS † MIN TYP ‡ MAX UNIT VIK Input clamp voltage II = –18 mA –1.5 V VO Output voltage IO = 0 0 6 V |VOD1 | Differential output voltage IO = 0 1.5 6 V |VOD2 | Differential output voltage R L = 100 W , See Figure 1 1/2VOD 1 or 2§ V |VOD2 | Differential output voltage R L = 54 W , See Figure 1 2.1 2.5 5 V VOD3 Differential output voltage Vtest = –7 V to 12 V,See Figure 2 1.5 5 V D |VOD | Change in magnitude of differential output voltage¶ ± 0.2 V VOC Common mode out put voltage R L =5 4W or 100W See Figure 1 3 VVOC Common -mode output voltage R L = 54 W or 100 W , See Figure 1 –1 V D |VOC | Change in magnitude of common-mode output voltage¶ ± 0.2 V IO Output current Outputs disabled, VO = 12 V 1 mAIO O utput current , See Note 4 VO = –7 V –0.8 mA IIH High-level input current VI = 2.4 V 20 mA IIL Low-level input current VI = 0.4 V –400 mA VO = –4 V –250 IOS Short circuit output current# VO = 0 –150 mAIOS Short-circuit output current# VO = VCC 250 mA VO = 8 V 250 ICC Supply current No load Outputs enabled 23 30 mAICC Supply current No load Outputs disabled 19 26 mA † The power-off measurement in TIA/EIA-422-B applies to disabled outputs only and is not applied to combined inputs and outputs. ‡ All typical values are at VCC = 5 V and TA = 25°C. § The minimum VOD2 with a 100-W load is either 1/2 VOD1 or 2 V, whichever is greater. ¶ D |VOD | and D |VOC | are the changes in magnitude of VOD and VOC , respectively, that occur when the input is changed from one logic state to the other. # Duration of the short circuit should not exceed one second for this test. NOTE 4: This applies for both power on and power off; refer to TIA/EIA-485-A for exact conditions. The TIA/EIA-422-B limit does not apply for a combined driver and receiver terminal.
DIFFERENTIAL BUS TRANSCEIVER SLLS295A – APRIL 1998 – REVISED DECEMBER 1999 5POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 switching characteristics over recommended ranges of supply voltage and operating free-air temperature range PARAMETER TEST CONDITIONS MIN TYP † MAX UNIT td(OD) Differential output delay time R5 4 W C5 0 F 15 ns tsk(p) Pulse skew‡ R L = 54 W, See Figure 3 C L = 50 pF, 0 2 ns tt(OD) Differential output transition time See Figure 3 8 ns tPZH Output enable time to high level R L = 110 W , See Figure 4 C L = 50 pF, 80 ns tPZL Output enable time to low level R L = 110 W , See Figure 5 C L = 50 pF, 30 ns tPHZ Output disable time from high level R L = 110 W , See Figure 4 C L = 50 pF, 50 ns tPLZ Output disable time from low level R L = 110 W , See Figure 5 C L = 50 pF, 30 ns † All typical values are at VCC = 5 V, TA = 25°C. ‡ Pulse skew is defined as the |tPLH – tPHL | of each channel of the same device. SYMBOL EQUIVALENTS DATA-SHEET PARAMETER TIA/EIA-422-B TIA/EIA-485-A VO Voa, Vob Voa, Vob |VOD1 | Vo Vo |VOD2 | Vt (RL = 100 W ) Vt (RL = 54 W ) |VOD3 | None Vt (test termination measurement 2) VOC |Vos| |Vos| IOS |Isa|, |Isb| None IO |Ixa|, |Ixb| Iia, Iib
DIFFERENTIAL BUS TRANSCEIVER SLLS295A – APRIL 1998 – REVISED DECEMBER 1999
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electrical characteristics over recommended ranges of common-mode input voltage, supply voltage, and operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP † MAX UNIT VIT+ Positive-going input threshold voltage VO = 2.7 V, IO = –0.4 mA 0.2 V VIT– Negative-going input threshold voltage VO = 0.5 V, IO = 8 mA –0.2‡ V Vhys Hysteresis voltage (VIT+ – VIT–) 60 mV VIK Enable-input clamp voltage II = –18 mA –1.5 V VOH High level output voltage VID = 200 mV, IOH = –400 mA, 27 VVOH High-level output voltage ID , See Figure 6 OH m , 2.7 V VOL Low level output voltage VID = –200 mV, IOL = 8 mA, 04 5 VVOL Low-level output voltage ID , See Figure 6 OL , 0.45 V IOZ High-impedance-state output current VO = 0.4 V to 2.4 V ± 20 mA VI Line input current Other input = 0 V,VI = 12 V 1 mAVI Line input current , See Note 5 VI = –7 V –0.8 mA IIH High-level-enable input current VIH = 2.7 V 20 mA IIL Low-level-enable input current VIL = 0.4 V –100 mA rI Input resistance 12 20 kW IOS Short-circuit output current VID = 200 mV, VO = 0 –15 –85 mA ICC Supply current No load Outputs enabled 23 30 mAICC Supply current No load Outputs disabled 19 26 mA † All typical values are at VCC = 5 V, TA = 25°C. ‡ The algebraic convention, in which the less positive (more negative) limit is designated minimum, is used in this data sheet for common-mode input voltage and threshold voltage levels only. NOTE 5: This applies for both power on and power off. Refer to TIA/EIA-485-A for exact conditions. switching characteristics over recommended ranges of supply voltage and operating free-air temperature range PARAMETER TEST CONDITIONS MIN TYP † MAX UNIT tpd Propagation time VID = –1.5 V to 1.5 V,C L = 15 pF, 25 ns tsk(p) Pulse skew§ ID , See Figure 7 L , 0 2 ns tPZH Output enable time to high level 11 18 ns tPZL Output enable time to low level C L =1 5pF See Figure 8 11 18 ns tPHZ Output disable time from high level C L = 15 pF, See Figure 8 50 ns tPLZ Output disable time from low level 30 ns † All typical values are at VCC = 5 V, TA = 25°C. § Pulse skew is defined as the |tPLH – tPHL | of each channel of the same device.
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2.3 VOutput
0 V or 3 V
50 W Voff ≈ 0 VGenerator
NOTES: A. C L includes probe and jig capacitance. Figure 4. Driver Enable and Disable Times NOTES: A. C L includes probe and jig capacitance. Figure 5. Driver Enable and Disable Times
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NOTES: A. CL includes probe and jig capacitance. Figure 8. Receiver Output Enable and Disable Times
DIFFERENTIAL BUS TRANSCEIVER SLLS295A – APRIL 1998 – REVISED DECEMBER 1999 11POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
- • • R T R T NOTE A: The line should terminate at both ends in its characteristic impedance (RT = ZO ). Stub lengths off the main line should be kept as short as possible.
Figure 9. Typical Application Circuit
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