SN74HC257 - 具有三态输出的四路 2 线路到 1 线路数据选择器/多路复用器

SN74HC257是TI德州仪器公司的一款解码器/编码器/多路复用器产品，SN74HC257是具有三态输出的四路 2 线路到 1 线路数据选择器/多路复用器，本站介绍了SN74HC257的封装应用图解、特点和优点、功能等，并给出了与SN74HC257相关的TI元器件型号供参考。

SN74HC257 - 具有三态输出的四路 2 线路到 1 线路数据选择器/多路复用器 - 解码器/编码器/多路复用器 - 特殊逻辑 - 德州仪器

产品描述

These devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (G\) input is at a high logic level.

To ensure the high-impedance state during power up or power down, (G\) should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

产品特性

Wide Operating Voltage Range of 2 V to 6 V
High-Current Inverting Outputs Drive up to 15 LSTTL Loads
Low Power Consumption, 80-µA Max ICC
’HC257 ...Typical tpd = 9 ns
’HC258 ...Typical tpd = 12 ns
±6-mA Output Drive at 5 V
Low Input Current of 1 µA Max
Provides Bus Interface from Multiple Sources in High-Performance Systems

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