1. General description

The 74HC158 is a high-speed Si-gate CMOS device and is pin compatible with low power

Schottky TTL (LSTTL). The 74HC158 is specified in compliance with JEDEC

standard no. 7A.

The 74HC158 is a quad 2-input multiplexer which select 4 bits of data from two sources

and are controlled by a common data select input (S). The four outputs present the

selected data in the inverted form. The enable input (E) is active LOW.

When E is HIGH, all the outputs (1Y to 4Y) are forced HIGH regardless of all other input

conditions.

Moving the data from two groups of registers to four common output buses is a common

use of the 74HC158. The state of S determines the particular register from which the data

comes. It can also be used as a function generator.

The device is useful for implementing highly irregular logic by generating any four of the

16 different functions of two variables with one variable common.

The 74HC158 is the logic implementation of a 4-pole, 2-position switch, where the

position of the switch is determined by the logic levels applied to S.

The logic equations for the output are:

1Y = E.(1l1.S  1l0.S)

2Y = E.(2l1.S  2l0.S)

3Y = E.(3l1.S  3l0.S)

4Y = E.(4l1.S  4l0.S)

The 74HC158 is identical to the 74HC157 but has inverting outputs.

2. Features and benefits

 Low-power dissipation

 Inverting data path

 Complies with JEDEC standard no. 7A

 ESD protection:

 HBM JESD22-A114F exceeds 2 000 V

 MM JESD22-A115-A exceeds 200 V

 Multiple package options



74HC158

Quad 2-input multiplexer; inverting

Rev. 4 — 23 December 2015 Product data sheet

Specified from −40° C to +85 °C and −40 °C to +125 °C

74HC158属于集成电路（IC） > 信号开关，多路复用器，解码器。安世半导体(中国)有限公司制造生产的74HC158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。