The 74F138 54F138 1-of-8 Decoder/Demultiplexer is a high-speed 1-of-8 decoder/demultiplexer produced by National Semiconductor Corporation. This device is ideally suited for high-speed bipolar memory chip select address decoding. Multiple input enables allow parallel expansion to a 1-of-24 decoder using just three 'F138 devices or a 1-of-32 decoder using four 'F138 devices and one inverter.
This document is a technical datasheet for the National Semiconductor 54F/74F138, a high-speed bipolar 1-of-8 decoder/demultiplexer. The device is designed for applications such as memory chip select address decoding and offers features like multiple input enables to facilitate parallel expansion.
| Device Type | 1-of-8 Decoder/Demultiplexer |
|---|---|
| ESD Protection | 4000V minimum |
| Supply Voltage (Commercial) | +4.5V to +5.5V |
| Operating Temperature (Military) | -55°C to +125°C |
| Input HIGH Voltage | 2.0V minimum |
It is ideally suited for high-speed bipolar memory chip select address decoding.
It requires four 'F138 devices and one inverter.
The device features two active LOW enables (Ej, Ex) and one active HIGH enable (Eg).