CD74AC251屬于集成電路（IC）的信號開關多路復用器解碼器。由美國德州儀器公司制造生產(chǎn)的CD74AC251信號開關，多路復用器，解碼器邏輯型信號開關、多路復用器和編碼器 IC 可用于對以數(shù)字格式表示數(shù)據(jù)的電信號進行路由和選擇。這些器件與設計用于模擬信號的類似產(chǎn)品有所不同，它們保留的信息表示為兩個電狀態(tài)之一，而不是兩個外部界限內(nèi)的無窮變化量。

1 Features

? Buffered inputs

? Typical propagation delay

– 6ns at VCC = 5V, TA = 25°C, CL = 50pF

? Exceeds 2kV ESD protection MIL-STD-883,

method 3015

? SCR-latchup-resistant CMOS process and circuit

design

? Speed of bipolar FAST?/AS/S with significantly

reduced power consumption

? Balanced propagation delays

? AC types feature 1.5V to 5.5V operation and

balanced noise immunity at 30% of the supply

? ±24mA output drive current

– Fanout to 15 FAST? ICs

– Drives 50Ω transmission lines

2 Description

The CD74AC251 8-input multiplexers that utilize

the Harris Advanced CMOS Logic technology. This

multiplexer features both true (Y) and complement

Y) outputs as well as an Output Enable (OE) input.

The OE must be at a LOW logic level to enable this

device. When the OE input is HIGH, both outputs are

in the high-impedance state. When enabled, address

information on the data select inputs determines

which data input is routed to the Y and Y outputs.