This is a 3-to-8 line decoder/demultiplexer designed for high-performance memory decoding or data routing applications requiring very short propagation delay time. It can be used in high-performance memory systems to minimize the effects of system decoding. When used with high-speed memories utilizing a fast enable circuit, the delay times of this decoder and the enable time of the memory are usually less than the typical access times of the memory. This means that the effective system delay introduced by the schottky-clamped system decoder is negligible.
The document provides technical specifications for the IN74LS138, a Schottky-clamped TTL MSI circuit intended for use in high-performance memory decoding or data-routing systems. It is designed to minimize system decoding effects by offering very short propagation delay times.
Key features include three enable inputs to simplify cascading and Schottky clamping for high performance across various plastic packages (N, D). The datasheet details maximum ratings, recommended operating conditions, DC electrical characteristics, AC electrical characteristics, and includes logic diagrams and function tables.
| Supply Voltage (Max) | 7.0 V |
|---|---|
| Input Voltage (Max) | 7.0 V |
| Output Voltage (Max) | 5.5 V |
| Storage Temperature Range | -65 to +150 °C |
| Ambient Temperature Range | 0 to +70 °C |
| Maximum Propagation Delay (Input A to Output Y2) | 41 ns |
It is designed for use in high-performance memory-decoding or data-routing applications requiring very short propagation delay time.
The recommended operating conditions specify a supply voltage range of 4.75 V to 5.25 V.
The device can handle a maximum low level output current of 8.0 mA.