QUADRUPLE BUS TRANSCEIVERS
SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
D Single 5-V Supply D High-In...
Description
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 VCC 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 driveroutput 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)
1B GND NC VCC 4B
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
2B GND
NC 3B 3R
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 wi...
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