SN751177, SN751178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
†
SN751177 . . . N OR NS PACKAGE
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
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1B
1A
1R
RE
2R
2A
V
CC
Designed for Multipoint Bus Transmission
on Long Bus Lines in Noise Environments
1D
1Y
1Z
DE
2Z
2Y
2D
Driver Positive- and Negative-Current
Limiting
Thermal Shutdown Protection
Driver 3-State Outputs
2B
GND
Receiver Common-Mode Input Voltage
Range of –12 V to 12 V
†
SN751178 . . . N OR NS PACKAGE
(TOP VIEW)
Receiver Input Sensitivity . . . ±200 mV
Receiver Hysteresis . . . 50 mV Typ
Receiver Input Impedance . . . 12 kΩ Min
Receiver 3-State Outputs (SN751177 Only)
Operate From Single 5-V Supply
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
1B
1A
1R
1DE
2R
2A
CC
1D
1Y
1Z
2DE
2Z
description
The SN751177 and SN751178 dual differential
drivers and receivers are monolithic integrated
circuits that are designed for balanced multipoint
bustransmissionatratesupto10Mbit/s. Theyare
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.
2Y
2D
2B
GND
†
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.
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.
Copyright 1999, Texas Instruments Incorporated
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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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265