SN55138 Datasheet, PDF (1/13 Pages) Texas Instruments – QUADRUPLE BUS TRANSCEIVERS

SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
D Single 5-V Supply
D High-Input-Impedance, High-Threshold
Receivers
D Common Driver Strobe
D TTL-Compatible Driver and Strobe Inputs
With Clamp Diodes
D High-Speed Operation
D 100-mA Open-Collector Driver Outputs
D Four Independent Channels
D TTL-Compatible Receiver Output
SN55138 . . . J OR W PACKAGE
SN75138 . . . D OR N PACKAGE
(TOP VIEW)
GND 1
1B 2
1R 3
1D 4
2D 5
2R ⁶
2B ⁷
GND ⁸
16 V_CC
15 4B
14 4R
13 4D
12 S
11 3D
10 3R
9 3B
description
The SN55138 and SN75138 quadruple bus
transceivers are designed for two-way data
communication over single-ended transmission
lines. Each of the four identical channels consists
of a driver with TTL inputs and a receiver with a
TTL output. The driver open-collector output is
designed to handle loads up to 100-mA open
collector. The receiver input is internally
connected to the driver output, and has a high
impedance to minimize loading of the
transmission line. Because of the high driver-
output current and the high receiver-input
impedance, a very large number (typically
hundreds) of transceivers may be connected to a
single data bus.
SN55138 . . . FK PACKAGE
(TOP VIEW)
1R
3 2 1 20 19
4
18
4R
1D ₅
17 ^4D
NC 6
16 NC
2D 7
15 S
2R 8
14 3D
9 10 11 12 13
NC – No internal connection
The receiver design also features a threshold of 2.3 V (typical), providing a wider noise margin than would be
possible with a receiver having the usual TTL threshold. A strobe turns off all drivers (high impedance) but does
not affect receiver operation. These circuits are designed for operation from a single 5-V supply and include a
provision to minimize loading of the data bus when the power-supply voltage is zero.
The SN55138 is characterized for operation over the full military temperature range of – 55°C to 125°C. The
SN75138 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.
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Copyright © 1995, Texas Instruments Incorporated
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