CD74HCT138中文资料高速 CMOS 逻辑 3 至 8 线路解码器/多路解复用器（反向和同向）数据手册TI规格书

描述 Description

The ’HC138, ’HC238, ’HCT138, and ’HCT238 are high speed silicon gate CMOS decoders well suited to memory address decoding or data routing applications. Both circuits feature low power consumption usually associated with CMOS circuitry, yet have speeds comparable to low power Schottky TTL logic. Both circuits have three binary select inputs (A0, A1 and A2). If the device is enabled, these inputs determine which one of the eight normally high outputs of the HC/HCT138 series will go low or which of the normally low outputs of the HC/HCT238 series will go high.

Two active low and one active high enables (E1\\, E2\\, and E3) are provided to ease the cascading of decoders. The decoder’s 8 outputs can drive 10 low power Schottky TTL equivalent loads.

特性 Features

• Select One Of Eight Data Outputs Active Low for 138, Active High for 238
• Three Enable Inputs to Simplify Cascading
• Fanout (Over Temperature Range)
• Bus Driver Outputs . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . –55°C to 125°C
• Significant Power Reduction Compared to LSTTL Logic ICs
• 2V to 6V Operation
• HCT Types
• Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
• CMOS Input Compatibility, Il 1µA at VOL, VOH

Data sheet acquired from Harris Semiconductor

简介

CD74HCT138属于集成电路（IC）的信号开关多路复用器解码器。由TI制造生产的CD74HCT138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。