MC54-74HC251 datasheet, PDF - EEWORLD Datasheet

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MC54-74HC251: Description8-Input Data Selector/Multiplexer with 3-State Outputs; File Size96KB，7 Pages; ManufacturerMotorola ( NXP ); Websitehttps://www.nxp.com

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MC54-74HC251 Overview

8-Input Data Selector/Multiplexer with 3-State Outputs

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MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

8-Input Data Selector/

Multiplexer with

3-State Outputs

High–Performance Silicon–Gate CMOS

The MC54/74HC251 is identical in pinout to the LS251. The device inputs

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

compatible with LSTTL outputs.

This device selects one of the eight binary Data Inputs, as determined by

the Address Inputs. The Output Enable pin must be a low level for the

selected data to appear at the outputs. If Output Enable is high, both the Y

and the Y outputs are in the high–impedance state. This 3–state feature

allows the HC251 to be used in bus–oriented systems.

The HC251 is similar in function to the HC151 which does not have

3–state outputs.

•

Output Drive Capability: 10 LSTTL Loads

Outputs Directly Interface to CMOS, NMOS, and TTL

Operating Voltage Range: 2 to 6 V

Low Input Current: 1

µA

High Noise Immunity Characteristic of CMOS Devices

In Compliance with the Requirements Defined by JEDEC Standard

No. 7A

•

Chip Complexity: 134 FETs or 33.5 Equivalent Gates

MC54/74HC251

J SUFFIX

CERAMIC PACKAGE

CASE 620–10

N SUFFIX

PLASTIC PACKAGE

CASE 648–08

D SUFFIX

SOIC PACKAGE

CASE 751B–05

ORDERING INFORMATION

MC54HCXXXJ

MC74HCXXXN

MC74HCXXXD

Ceramic

Plastic

SOIC

PIN ASSIGNMENT

VCC

LOGIC DIAGRAM

DATA

INPUTS

5 Y

DATA

OUTPUTS

6 Y

OUTPUT

ENABLE

GND

D4 15

D5 14

D6 13

D7 12

A0 11

A2 9

PIN 16 = VCC

PIN 8 = GND

FUNCTION TABLE

Inputs

A1 A0

Output

Enable

Outputs

ADDRESS

INPUTS

OUTPUT ENABLE

Z = high impedance

D0, D1,

…,

D7 = the level of the respective

D input.

10/95

Motorola, Inc. 1995

REV 6

MC54-74HC251 Related Products

	MC54-74HC251	MC74HC251	MC54HC251
Description	8-Input Data Selector/Multiplexer with 3-State Outputs	8-Input Data Selector/Multiplexer with 3-State Outputs	8-Input Data Selector/Multiplexer with 3-State Outputs

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