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. 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 55C to 125C. The SN75138 is characterized for operation from 0C to 70C. By Texas Instruments
SN55138 's PackagesSN55138 's pdf datasheet

SN55138 Pinout, Pinouts
SN55138 pinout,Pin out
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