SN75138
description
The SN55138 and SN75138 quadruple bus transceivers are designed for two-way data munication 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-m A 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
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
- 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...
