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IN74ACT251

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

IN74ACT251

The IN74ACT251 is identical in pinout to the LS/ALS251,

HC/HCT251. The IN74ACT251 may be used as a level converter for

interfacing TTL or NMOS outputs to High Speed CMOS inputs.

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 IN74ACT251 to be used in bus-

oriented systems.

• TTL/NMOS Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 4.5 to 5.5 V

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

• Outputs Source/Sink 24 mA

ORDERING INFORMATION

IN74ACT251N Plastic

IN74ACT251D SOIC

TA = -40° to 85° C for all

packages

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 16 =VCC

PIN 8 = GND

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

341

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