SN74HCT257 - 具有三态输出的四路 2 线路至 1 线路数据选择器/多路复用器

SN74HCT257是TI德州仪器公司的一款解码器/编码器/多路复用器产品，SN74HCT257是具有三态输出的四路 2 线路至 1 线路数据选择器/多路复用器，本站介绍了SN74HCT257的封装应用图解、特点和优点、功能等，并给出了与SN74HCT257相关的TI元器件型号供参考。

SN74HCT257 - 具有三态输出的四路 2 线路至 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

The ’HCT257 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 (OE)\ input is at the high logic level.

To ensure the high-impedance state during power up or power down, OE\ 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

Operating Voltage Range of 4.5 V to 5.5 V
High-Current 3-State Outputs Interface Directly With System Bus
Typical tpd = 17 ns
Low Power Consumption, 80-µA Max ICC
±6-mA Output Drive at 5 V
Low Input Current of 1 µA Max
Inputs Are TTL-Voltage Compatible
Provide Bus Interface From Multiple Sources in High-Performance Systems
Buffered Inputs and Outputs

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