The SN75138N quadruple bus transceiver is 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.
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 SN75138N is characterized for operation from 0°C to 70°C.
Single 5-V Supply
High-Input-Impedance, High-Threshold Receivers
Common Driver Strobe
TTL-Compatible Driver and Strobe Inputs With Clamp Diodes
100-mA Open-Collector Driver Outputs
Four Independent Channels
TTL-Compatible Receiver Output
Datasheet Available:Texas Instruments SN75138N
16 pin DIP. Manufactured by Texas Instruments.