DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
D Meet or Exceed the Requirements of ANSI
Standards TIA/EIA-422-B and TIA/EIA-485-A
and ITU Recommendations V.10 and V.11
D Designed for Multipoint Bus Transmission
on Long Bus Lines in Noise Environments
D Driver Positive- and Negative-Current
D Thermal Shutdown Protection
D Driver 3-State Outputs
D Receiver Common-Mode Input Voltage
Range of –12 V to 12 V
D Receiver Input Sensitivity . . . ±200 mV
D Receiver Hysteresis . . . 50 mV Typ
D Receiver Input Impedance . . . 12 kΩ Min
D Receiver 3-State Outputs (SN751177 Only)
D Operate From Single 5-V Supply
The SN751177 and SN751178 dual differential
drivers and receivers are monolithic integrated
circuits that are designed for balanced multipoint
bus transmission at rates up to 10 Mbit/s. They are
designed to improve the performance of
full-duplex data communications over long bus
lines and meet ANSI Standards TIA/EIA-422-B
and TIA/EIA-485-A and ITU Recommendations
V.10 and V.11.
SN751177 . . . N OR NS† PACKAGE
SN751178 . . . N OR NS† PACKAGE
† The NS package is only available taped and reeled.
The SN751177 and SN751178 driver outputs provide limiting for both positive and negative currents and
thermal-shutdown protection from line-fault conditions on the transmission bus line.
The receiver features high input impedance of at least 12 kΩ, an input sensitivity of ±200 mV over a
common-mode input voltage range of –12 V to 12 V, and typical input hysteresis of 50 mV. Fail-safe design
ensures that if the receiver inputs are open, the receiver outputs always will be high.
The SN751177 and SN751178 are characterized for operation from –20°C to 85°C.
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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.
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