SN75138

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...