74AHC157 판매점 - Quad 2-input multiplexer

Philips Semiconductors

Quad 2-input multiplexer

Product speciﬁcation

74AHC157;

74AHCT157

FEATURES

• ESD protection: HBM EIA/JESD22-A114-A

exceeds 2000 V MM EIA/JESD22-A115-A

exceeds 200 V CDM EIA/JESD22-C101

exceeds 1000 V

• Balanced propagation delays

• All inputs have Schmitt-trigger actions

• Multiple input enable for easy expansion

• Ideal for memory chip select decoding

• Inputs accept voltages higher than VCC

• For AHC only: operates with CMOS input levels

• For AHCT only: operates with TTL input levels

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

FUNCTION TABLE

See note 1.

INPUT

OUTPUT

E S nI0 nI1

HXXX

LLLX

L LHX

L HX L

LHXH

Note

1. H = HIGH voltage level;

L = LOW voltage level;

X = don’t care.

DESCRIPTION

The 74AHC/AHCT157 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 74AHC/AHCT157 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 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 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 ‘157’ is the logic implementation of a 4-pole, 2-position

switch, where the position of the switch is determine by the

logic levels applied to S.

The logic equations are:

1Y = E × (1I1 × S + 1I0 × S);

2Y = E × (2I1 × S + 2I0 × S);

3Y = E × (3I1 × S + 3I0 × S);

4Y = E × (4I1 × S + 4I0 × S).

The ‘157’ is identical to the ‘158’ but has non-inverting

(true) outputs.

ORDERING INFORMATION

OUTSIDE NORTH

AMERICA

NORTH AMERICA

74AHC157D

74AHC157PW

74AHCT157D

74AHCT157PW

74AHC157D

74AHC157PW DH

74AHCT157D

74AHCT157PW DH

PINS

PACKAGES

PACKAGE

MATERIAL

TSSOP

plastic

CODE

SOT109-1

SOT403-1

SOT109-1

SOT403-1

1999 Sep 24

74AHC157 반도체 회로 부품 판매점

Quad 2-input multiplexer

국내 전력반도체 판매점

일반적인 전자부품 판매점

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