November 1992

Revised April 1999

© 1999 Fairchild Semiconductor Corporation

DS011536.prf

www.fairchildsemi.com

74VHC157

Quad 2-Input Multiplexer

General Description

The VHC157 is an advanced high speed CMOS Quad 2-

Channel Multiplexer fabricated with silicon gate CMOS

technology. It achieves the high speed operation similar to

equivalent Bipolar Schottky TTL while maintaining the

CMOS low power dissipation.

It consists of four 2-input digital multiplexers with common

select and enable inputs. When the ENABLE input is held

“H” level, selection of data is inhibited and all the outputs

become “L” level. The SELECT decoding determines

ing outputs.

An Input protection circuit ensures that 0V to 7V can be

applied to the input pins without regard to the supply volt-

age. This device can be used to interface 5V to 3V systems

and on two supply systems such as battery back up. This

circuit prevents device destruction due to mismatched sup-

ply and input voltages.

Features

s Power down protection is provided on all inputs

s Pin and function compatible with 74HC157

Ordering Code:

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

Order Number

Package Number

Package Description

74VHC157M

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow

74VHC157SJ

M16D

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74VHC157MTC

MTC16

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74VHC157N

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Pin Names

Description

Source 0 Data Inputs

Source 1 Data Inputs

E

Enable Input

S

Select Input

Outputs