74AC257集成电路（IC）的信号开关多路复用器解码器规格书PDF中文资料

74AC257属于集成电路（IC）的信号开关多路复用器解码器。由安森美半导体制造生产的74AC257信号开关，多路复用器，解码器逻辑型信号开关、多路复用器和编码器 IC 可用于对以数字格式表示数据的电信号进行路由和选择。这些器件与设计用于模拟信号的类似产品有所不同，它们保留的信息表示为两个电状态之一，而不是两个外部界限内的无穷变化量。

Quad 2−Input Multiplexer with 3−State Outputs

The MC74AC257/74ACT257 is a quad 2−input multiplexer with 3−state outputs. Four bits of data from two sources can be selected using a Common Data Select input. The four outputs present the selected data in true (noninverted) form. The outputs may be switched to a high impedance state by placing a logic HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus−oriented systems.

• Multiplexer Expansion by Tying Outputs Together

• Noninverting 3−State Outputs

• Outputs Source/Sink 24 mA

• ′ACT257 Has TTL Compatible Inputs