SN65176B, SN75176B
DIFFERENTIAL BUS TRANSCEIVERS
SLLS101B – JULY 1985 – REVISED JUNE 1999
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Bidirectional Transceivers
Meet or Exceed the Requirements of ANSI
Standards TIA/EIA-422-B and TIA/EIA-485-A
and ITU Recommendations V.11 and X.27
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 kΩ Min
Receiver Input Sensitivity . . .
±
200 mV
Receiver Input Hysteresis . . . 50 mV Typ
Operate From Single 5-V Supply
D OR P PACKAGE
(TOP VIEW)
R
RE
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8
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CC
B
A
GND
description
The SN65176B and SN75176B differential bus transceivers are monolithic integrated circuits designed for
bidirectional data communication on multipoint bus transmission lines. They are designed for balanced
transmission lines and meet ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations
V.11 and X.27.
The SN65176B and SN75176B combine 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 differential input/output
(I/O) bus ports that are designed to offer minimum loading to the bus when the driver is disabled or V
CC
= 0.
These ports feature wide positive and negative common-mode voltage ranges, making the device suitable for
party-line applications.
The driver is designed for 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 150°C. The receiver features a minimum input impedance of 12 kΩ,
an input sensitivity of
±
200 mV, and a typical input hysteresis of 50 mV.
The SN65176B and SN75176B 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 SN65176B is characterized for operation from – 40°C to 105°C and the SN75176B is characterized for
operation from 0°C to 70°C.
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
©
1999, Texas Instruments Incorporated
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