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Product details

Parameters

Operating temperature range (C) 0 to 70 open-in-new Find other Other interfaces

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (D) 16 59 mm² 9.9 x 6 SOP (NS) 16 80 mm² 10.2 x 7.8 open-in-new Find other Other interfaces

Features

  • Single 5-V Supply
  • High-Input-Impedance, High-Threshold Receivers
  • Common Driver Strobe
  • TTL-Compatible Driver and Strobe Inputs With Clamp Diodes
  • High-Speed Operation
  • 100-mA Open-Collector Driver Outputs
  • Four Independent Channels
  • TTL-Compatible Receiver Output

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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 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 -55°C to 125°C. The SN75138 is characterized for operation from 0°C to 70°C.

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Technical documentation

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Type Title Date
* Datasheet Quadruple Bus Transceivers datasheet (Rev. B) May 01, 1995

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CAD/CAE symbols

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PDIP (N) 16 View options
SO (NS) 16 View options
SOIC (D) 16 View options

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