Datasheet > MC74HC257N

MC74HC257N

更新时间： 2024-10-01 23:01:35

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		复用器
页数	文件大小	规格书
6页	178K
描述
Quad 2-Input Data Selector/Multiplexer with 3-State Outputs

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MC74HC257N 数据手册

SEMICONDUCTOR TECHNICAL DATA

N SUFFIX

PLASTIC PACKAGE

CASE 648–08

High–Performance Silicon–Gate CMOS

The MC74HC257 is identical in pinout to the LS257. The device inputs are

compatible with standard CMOS outputs; with pullup resistors, they are

compatible with LSTTL outputs.

D SUFFIX

This device selects a (4–bit) nibble from either the A or B inputs as

determined by the Select input. The nibble is presented at the outputs in

noninverted form when the Output Enable pin is at a low level. A high level on

the Output Enable pin switches the outputs into the high–impedance state.

The HC257 is similar in function to the HC157 which do not have 3–state

outputs.

SOIC PACKAGE

CASE 751B–05

ORDERING INFORMATION

MC74HCXXXN

MC74HCXXXD

Plastic

SOIC

•

Output Drive Capability: 15 LSTTL Loads

Outputs Directly Interface to CMOS, NMOS, and TTL

Operating Voltage Range: 2 to 6 V

PIN ASSIGNMENT

Low Input Current: 1 µA

High Noise Immunity Characteristic of CMOS Devices

In Compliance with the Requirements Defined by JEDEC Standard

No. 7A

SELECT

OUTPUT

ENABLE

•

Chip Complexity: 108 FETs or 27 Equivalent Gates

LOGIC DIAGRAM

GND

NIBBLE

A INPUT

FUNCTION TABLE

Inputs

Output

Enable Select

Outputs

NONINVERTING

NIBBLE

OUTPUT

Y0 – Y3

NIBBLE

B INPUT

A0 – A3

B0 – B3

X = don’t care

Z = high impedance

A0–A3, B0–B3 = the levels of the

respective Nibble Inputs.

SELECT

OUTPUT

ENABLE

PIN 16 = V

PIN 8 = GND

10/95

REV 6

Motorola, Inc. 1995

12 3 4 5 6

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