SN74AS138 - 3 线路至 8 线路解码器/多路解复用器

SN74AS138是TI德州仪器公司的一款解码器/编码器/多路复用器产品，SN74AS138是3 线路至 8 线路解码器/多路解复用器，本站介绍了SN74AS138的封装应用图解、特点和优点、功能等，并给出了与SN74AS138相关的TI元器件型号供参考。

SN74AS138 - 3 线路至 8 线路解码器/多路解复用器 - 解码器/编码器/多路复用器 - 特殊逻辑 - 德州仪器

产品描述

The ´ALS138A and ´AS138 are 3-line to 8-line decoders/demultiplexers designed for high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance systems, these devices can be used to minimize the effects of system decoding. When employed with high-speed memories with a fast enable circuit, the delay times of the decoder and the enable time of the memory are usually less than the typical access time of the memory. The effective system delay introduced by the Schottky-clamped system decoder is negligible.

The conditions at the binary-select (A, B, and C) inputs and the three enable (G1, , and ) inputs select one of eight output lines. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications.

The SN54ALS138A and SN54AS138 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS138A and SN74AS138 are characterized for operation from 0°C to 70°C.

产品特性

Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems
Incorporate Three Enable Inputs to Simplify Cascading and/or Data Reception
Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

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