CD74AC139M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

CD74AC139M属于集成电路（IC）的信号开关多路复用器解码器。由德州仪器制造生产的CD74AC139M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。

AC Types Feature 1.5-V to 5.5-V Operation

and Balanced Noise Immunity at 30% of the

Supply Voltage

Buffered Inputs

Incorporate Two Enable Inputs to Simplify

Cascading and/or Data Reception

Speed of Bipolar F, AS, and S, With

Significantly Reduced Power Consumption

Balanced Propagation Delays

±24-mA Output Drive Current

– Fanout to 15 F Devices

SCR-Latchup-Resistant CMOS Process and

Circuit Design

Exceeds 2-kV ESD Protection Per

MIL-STD-883, Method 3015

description/ordering information

The ’AC139 devices are dual 2-line to 4-line decoders/demultiplexers designed for 1.5-V to 5.5-V VCC operation.

These devices are designed to be used in high-performance memory-decoding or data-routing applications

requiring very short propagation delay times. In high-performance memory systems, these decoders can be

used to minimize the effects of system decoding. When used with high-speed memories utilizing a fast enable

circuit, the delay times of these decoders and the enable time of the memory usually are less than the typical

access time of the memory. This means that the effective system delay introduced by the decoders is negligible.

The active-low enable (G) input can be used as a data line in demultiplexing applications. These

decoders/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its

driving circuit.