Philips 74HC158
The 74HC/HCT158 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. The 74HC/HCT158 are quad 2-input multiplexers which select 4 bits of data from two sources and are controlled by a common data select input (S).| Part No. | 74HC158 |
|---|---|
| Datasheet | 74HC158 Download |
| Manufacturer |  Philips |
| Description | Quad 2-input multiplexer inverting |
| Buy | Stock & Price |
FEATURES
● Inverting data path● Output capability: standard
● ICC category: MSI
GENERAL DESCRIPTION
7A. 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. QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns 74HC/HCT158 Moving the data from two groups of registers to four common output buses is a common use of the “158”. 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 ”158” 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 “158” is identical to the “157” but has inverting outputs.
