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。由意法半导体集团制造生产的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。

DESCRIPTION

The AC257 is an advanced high-speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power applications mantaining high speed operation similar to equivalent Bipolar Schottky TTL.

■ HIGH SPEED: tPD =4.5 ns (TYP.) at VCC = 5V

■ LOW POWER DISSIPATION: ICC =8 µA (MAX.) at TA =25 oC

■ HIGH NOISE IMMUNITY: VNIH = VNIL = 28 VCC (MIN.)

■ 50Ω TRANSMISSIONLINE DRIVING CAPABILITY

■ SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN)

■ BALANCED PROPAGATIONDELAYS: tPLH ≅ tPHL

■ OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V

■ PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257

■ IMPROVEDLATCH-UP IMMUNITY