IN74AC251D Просмотр технического описания (PDF) - Integral Corp.

Номер в каталоге

Компоненты Описание

Список матч

IN74AC251D

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

Integral Corp. 

TECHNICAL DATA

8-Input Data Selector/Multiplexer

with 3-State Outputs

High-Speed Silicon-Gate CMOS

IN74AC251

The IN74AC251 is identical in pinout to the LS/ALS251,

HC/HCT251. The device inputs are compatible with standard CMOS

outputs; with pullup resistors, they are compatible with LS/ALS

outputs.

The device selects one of the eight binary Data Inputs, as

determined by the Address Inputs. The Output Enable pin must be at a

low level for the selected data to appear at the outputs. If Output

Enable is high, the Y and the Y outputs are in the high-impedance

state. This 3-State feature allows the IN74AC251 to be used in bus-

oriented systems.

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2.0 to 6.0 V

• Low Input Current: 1.0 µA; 0.1 µA @ 25°C

• High Noise Immunity Characteristic of CMOS Devices

• Outputs Source/Sink 24 mA

ORDERING INFORMATION

IN74AC251N Plastic

IN74AC251D SOIC

TA = -40° to 85° C for all

packages

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 16 =VCC

PIN 8 = GND

336

FUNCTION TABLE

Inputs

Outputs

A2 A1 A0 Output Y Y

Enable

XX X

H

ZZ

LL L

L D0 D0

LL H

L D1 D1

LH L

L D2 D2

LH H

L D3 D3

HL L

L D4 D4

HL H

L D5 D5

HH L

L D6 D6

HH H

L D7 D7

D0,D1...D7=the level of the respective D

input

Z = high-impedance state

X = don’t care

Share Link: