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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
D D D D D D D D D D D D D D
Bidirectional Transceiver Meets or Exceeds the Requirements of ANSI Standards EIA/TIA-422-B and ITU Recommendation V.11 Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Driver and Receiver Outputs Individual Driver and Receiver Enables Wide Positive and Negative Input /Output Bus Voltage Ranges Driver Output Capability . . . 60 mA Max Thermal-Shutdown Protection Driver Positive- and Negative-Current Limiting Receiver Input Impedance . . . 12 k Min Receiver Input Sensitivity . . . 200 mV Receiver Input Hysteresis . . . 50 mV Typ Operates From Single 5-V Supply Low Power Requirements
D OR P PACKAGE (TOP VIEW)
R RE DE D
1 2 3 4
8 7 6 5
VCC B A GND
description
The SN75176A differential bus transceiver is a monolithic integrated circuit designed for bidirectional data communication on multipoint bus-transmission lines. It is designed for balanced transmission lines and meets ANSI Standard EIA/TIA-422-B and ITU Recommendation V.11. The SN75176A 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 externally connected together to function as a direction control. The driver differential outputs and the receiver differential inputs are connected internally to form differential input /output (I/O) bus ports that are designed to offer minimum loading to the bus whenever the driver is disabled or VCC = 0. These ports feature wide positive and negative common-mode voltage ranges making the device suitable for party-line applications. The driver is designed to handle loads up to 60 mA of sink or source current. The driver features positive- and negative-current limiting and thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150C. The receiver features a minimum input impedance of 12 k, an input sensitivity of 200 mV, and a typical input hysteresis of 50 mV. The SN75176A can be used in transmission-line applications employing the SN75172 and SN75174 quadruple differential line drivers and SN75173 and SN75175 quadruple differential line receivers. The SN75176A is characterized for operation from 0C to 70C.
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.
PRODUCTION 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.
Copyright (c) 1995, Texas Instruments Incorporated
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
Function Tables
DRIVER INPUT D H L X ENABLE DE H H L RECEIVER DIFFERENTIAL INPUTS A-B VID 0.2 V - 0.2 V < VID < 0.2 V VID - 0.2 V X Open ENABLE RE L L L H L OUTPUT R H ? L Z ? OUTPUTS A H L Z B L H Z
H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = high impedance (off)
logic symbol
DE RE 3 2 EN1 EN2 6 7
logic diagram (positive logic)
DE D 1 1 A B RE R 3 4 2 1 6 7 A B Bus
D
4
R
1
2
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT VCC R(eq) 16.8 k NOM 960 NOM 960 NOM TYPICAL OF A AND B I/O PORTS VCC TYPICAL OF RECEIVER OUTPUT VCC 85 NOM
Input
Output
GND Driver input: R(eq) = 3 k NOM Enable inputs: R(eq) = 8 k NOM R(eq) = equivalent resistor Input/Output Port
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage range at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 10 V to 15 V Enable input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to 70C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to 150C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260C
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. NOTE 1: All voltage values, except differential input/output bus voltage, are with respect to network ground terminal. DISSIPATION RATING TABLE PACKAGE D P TA 25C POWER RATING 725 mW 1100 mW DERATING FACTOR ABOVE TA = 25C 5.8 mW/C 8.8 mW/C TA = 70_C POWER RATING 464 mW 704 mW TA = 105_C POWER RATING 261 mW 396 mW
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
recommended operating conditions
MIN Supply voltage, VCC Voltage at any bus terminal (separately or common mode), VI or VIC High-level input voltage, VIH Low-level input voltage, VIL D, DE, and RE D, DE, and RE Driver Receiver Driver Receiver 4.75 -7 2 0.8 12 - 60 - 400 60 8 TYP 5 MAX 5.25 12 UNIT V V V V V mA A mA C
Differential input voltage, VID (see Note 2) High-level High level output current IOH current, Low level output current, IOL current Low-level
Operating free-air temperature, TA 0 70 NOTE 2: Differential-input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
DRIVER SECTION electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER VIK VOH VOL |VOD1| |VOD2| |VOD| VOC |VOC| IO IIH IIL IOS Input clamp voltage High-level High level output voltage Low level output voltage Low-level Differential output voltage Differential output voltage Change in magnitude of differential output voltage Common-mode output voltage Change in magnitude of common-mode output g g voltage Output current High-level input current Low-level input current Short-circuit output current Output disabled, , See Note 3 VI = 2.4 V VI = 0.4 V VO = - 7 V VO = VCC VO = 12 V ICC Supply current (total package) No load Outputs enabled Outputs disabled 35 26 VO = 12 V VO = - 7 V RL = 54 or 100 , See Figure 1 TEST CONDITIONS II = - 18 mA VIH = 2 V, , IOH = - 33 mA VIH = 2 V, , IOH = 33 mA IO = 0 RL = 100 , RL = 54 , VIL = 0.8 V, , VIL = 0.8 V, , 3.7 37 11 1.1 2VOD2 See Figure 1 See Figure 1 2 1.5 2.7 2.4 0.2 3 0 2 0.2 1 - 0.8 20 - 400 - 250 250 500 50 40 mA mA MIN TYP MAX - 1.5 UNIT V V V V V V V V mA A A
All typical values are at VCC = 5 V and TA = 25C. |VOD| and |VOC| are the changes in magnitude of VOD and VOC respectively, that occur when the input is changed from a high level to a low level. In ANSI Standard EIA/TIA-422-B, VOC, which is the average of the two output voltages with respect to GND, is called output offset voltage, VOS. NOTE 3: This applies for both power on and off; refer to ANSI Standard EIA/TIA-422-B for exact conditions.
switching characteristics, VCC = 5 V, TA = 25C
PARAMETER td(OD) tt(OD) tPZH tPZL tPHZ tPLZ Differential-output delay time Differential-output transition time Output enable time to high level Output enable time to low level Output disable time from high level Output disable time from low level TEST CONDITIONS RL = 60 , RL = 110 , RL = 110 , RL = 110 , RL = 110 , See Figure 3 See Figure 4 See Figure 5 See Figure 4 See Figure 5 MIN TYP 40 65 55 30 85 20 MAX 60 95 90 50 130 40 UNIT ns ns ns ns ns ns
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
RECEIVER SECTION electrical characteristics over recommended ranges of common-mode input voltage, supply voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER VIT + VIT- Vhys VIK VOH VOL IOZ II IIH IIL ri IOS ICC Positive-going input threshold voltage Negative-going input threshold voltage Input hysteresis voltage (VIT + - VIT -) Enable clamp voltage High-level High level output voltage Low-level Low level output voltage High-impedance-state output current Line input current High-level enable input current Low-level enable input current Input resistance Short-circuit output current Supply current (total package) No load Outputs enabled Outputs disabled II = - 18 mA VID = 200 mV, , See Figure 2 VID = - 200 mV, , See Figure 2 VO = 0.4 V to 2.4 V Other input = 0 V, , See Note 3 VIH = 2.7 V VIL = 0.4 V 12 - 15 35 26 - 85 50 40 VI = 12 V VI = - 7 V IOH = - 400 , A, IOL = 8 mA, , 2.7 27 0.45 0 45 20 1 - 0.8 20 - 100 TEST CONDITIONS VO = 2.7 V, VO = 0.5 V, IO = - 0.4 mA IO = 8 mA MIN - 0.2 50 - 1.5 TYP MAX 0.2 UNIT V V mV V V V A mA A A k mA mA
All typical values are at VCC = 5 V, TA = 25C. 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 3: This applies for both power on and power off. Refer to ANSI Standard EIA/TIA-422-B for exact conditions.
switching characteristics, VCC = 5 V, CL = 15 pF, TA = 25C
PARAMETER tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation delay time, low-to-high-level output Propagation delay time, high-to-low-level output Output enable time to high level Output enable time to low level Output disable time from high level Output disable time from low level TEST CONDITIONS VID = - 1.5 V to 1.5 V, 15 15V See Figure 7 See Figure 7 See Figure 6 MIN TYP 21 23 10 12 20 17 MAX 35 35 30 30 35 25 UNIT ns ns ns ns ns ns
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
RL VOD2 2 RL 2 VOC
VID VOH 0V VOL +IOL - IOH
Figure 1. Driver VOD and VOC
Figure 2. Receiver VOH and VOL
3V Input CL = 50 pF (see Note B) Output td(OD) Output CL 50% 10% 90% 1.5 V 1.5 V 0V td(OD) 2.5 V 50% 10% - 2.5 V tt(OD)
Generator (see Note A)
RL = 60 50 3V
tt(OD)
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr 6 ns, tf 6 ns, ZO = 50 . B. CL includes probe and jig capacitance.
Figure 3. Driver Test Circuit and Voltage Waveforms
Output S1 0 or 3 V CL = 50 pF (see Note B) RL = 110 tPZH Output 2.3 V tPHZ VOLTAGE WAVEFORMS Input 1.5 V 1.5 V 0V 0.5 V VOH Voff 0 V 3V
Generator (see Note A)
50
TEST CIRCUIT
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr 6 ns, tf 6 ns, ZO = 50 . B. CL includes probe and jig capacitance.
Figure 4. Driver Test Circuit and Voltage Waveforms
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
5V RL = 110 Output tPZL CL = 50 pF (see Note B) 50 Output 2.3 V tPLZ Input 1.5 V 1.5 V
3V 0V
S1 3 V or 0
Generator (see Note A)
5V 0.5 V VOL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr 6 ns, tf 6 ns, ZO = 50 . B. CL includes probe and jig capacitance.
Figure 5. Driver Test Circuit and Voltage Waveforms
3V Generator (see Note A) 51 1.5 V CL = 15 pF (see Note B) 0V tPLH Output 1.3 V tPHL VOH 1.3 V VOL TEST CIRCUIT VOLTAGE WAVEFORMS NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr 6 ns, tf 6 ns, ZO = 50 . B. CL includes probe and jig capacitance. Output Input 1.5 V 1.5 V 0V
Figure 6. Receiver Test Circuit and Voltage Waveforms
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
1.5 V -1.5 V
S1 2 k S2 5V
CL = 15 pF (see Note B) Generator (see Note A) 50
5 k
1N916 or Equivalent
S3 TEST CIRCUIT 3V Input 1.5 V S1 to 1.5 V 0 V S2 Open S3 Closed VOH Output 1.5 V 0V Output 1.5 V VOL 3V Input 1.5 V 0V tPHZ VOH Output 1.3 V VOLTAGE WAVEFORMS NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr 6 ns, tf 6 ns, ZO = 50 . B. CL includes probe and jig capacitance. 0.5 V VOL tPLZ 1.3 V S1 to 1.5 V S2 Closed S3 Closed Input 1.5 V 0V 3V S1 to - 1.5 V S2 Closed S3 Closed 4.5 V Input 3V 1.5 V S1 to -1.5 V 0 V S2 Closed S3 Open
tPZH
tPZL
0.5 V Output
Figure 7. Receiver Test Circuit and Voltage Waveforms
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
TYPICAL CHARACTERISTICS
DRIVER DRIVER
HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT
5 VOH VOH - High-Level Output Voltage - V 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0 - 20 - 40 - 60 - 80 - 100 IOH - High-Level Output Current - mA - 120 VCC = 5 V TA = 25C VOL - Low-Level Output Voltage - V 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0
LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT
VCC = 5 V TA = 25C
20 40 60 80 100 IOL - Low-Level Output Current - mA
120
Figure 8
DRIVER
Figure 9
RECEIVER
DIFFERENTIAL OUTPUT VOLTAGE vs OUTPUT CURRENT
4 VOD VOD - Differential Output Voltage - V VOL - Low-Level Output Voltage - V VOL 3.5 3 2.5 2 1.5 1 0.5 0 VCC = 5 V TA = 25C 0.6
LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT
VCC = 5 V TA = 25C 0.5
0.4
0.3
0.2
0
10
20
30 40 50 60 70 80 IO - Output Current - mA
90 100
Figure 10
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AA AA AA
0.1
0 0 5 10 15 20 25 IOL - Low Level Output Current - mA 30
Figure 11
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
TYPICAL CHARACTERISTICS
RECEIVER RECEIVER
LOW-LEVEL OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE
0.5 VOL VOL - Low-Levcel Output Voltage - V VCC = 5 V VID = - 0.2 V IOL = 8 mA VO VO - Output Voltage - V 5
OUTPUT VOLTAGE vs ENABLE VOLTAGE
VID = 0.2 V Load = 8 k to GND TA = 25C
0.4
4
VCC = 5.25 V
0.3
3
VCC = 5 V
VCC = 4.75 V
0.2
2
0.1
0 0 10 70 20 30 50 40 60 TA - Free-Air Temperature - C 80
Figure 12
RECEIVER
OUTPUT VOLTAGE vs ENABLE VOLTAGE
6 VCC = 5.25 V 5 VO - Output Voltage - V VO VCC = 4.75 V 4 VCC = 5 V VID = 0.2 V Load = 1 k to VCC TA = 25C
3
2
1
0 0 0.5 1 1.5 2 VI - Enable Voltage - V 2.5 3
Figure 14
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AA AA AA AA
AA AA AA
1
0 0 0.5 2 1 1.5 VI - Enable Voltage - V 2.5 3
Figure 13
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SN75176A DIFFERENTIAL BUS TRANSCEIVER
SLLS100A - JUNE 1984 - REVISED MAY 1995
APPLICATION INFORMATION
SN65176A SN65176A RT RT
Up to 32 Transceivers
NOTE A: The line should be terminated at both ends in its characteristic impedance (RT = ZO). Stub lengths off the main line should be kept as short as possible.
Figure 15. Typical Application Circuit
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Copyright (c) 1998, Texas Instruments Incorporated

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