74HC/HCT157

General description

The 74HC/HCT157 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. 7A.

The 74HC/HCT157 are quad 2-input multiplexers which select 4 bits of data from two sources under the control of a common data select input (S). The four outputs present the selected data in the true (non-inverted) form. The enable input (E) is active LOW. When E is HIGH, all of the outputs (1Y to 4Y) are forced LOW 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 '157'. The state of the common data select input (S) determines the particular register from which the data comes. It can also be used as 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 '157' 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 are:

1Y = E.(1l₁.S + 1l₀.S)
2Y = E.(2l₁.S + 2l0₀.S)
3Y = E.(3l₁.S + 3l₀.S)
4Y = E.(4l₁.S + 4l₀.S)

The '157' is identical to the '158' but has non-inverting (true) outputs.

Features

• Non-inverting data path
• Output capability: standard
• I_CC category: MSI

Products/packages

Pricing/ordering/availability

Applications

• Thin and thick film circuits
• General purpose fast switching applications.

Design support

Application Notes

AN99055_1; TDA8798HL - DUAL 8-BIT A/D CONVERTER WITH DPGA DEMONSTRATION BOARD (01-Oct-99)

Support Documents

HCT_USER_GUIDE; HC/T User Guide (1997-11-01)

75013486; Philips Logic Competitive Cross Reference Guide (2004-09-14)

Parametrics/similar products

Similar products
74HC/HCT157 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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