IN74ACT251 查看數據表（PDF） - Integral Corp.

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IN74ACT251

8-INPUT DATA SELECTOR/MULTIPLEXER WITH 3-STATE OUTPUTS

Integral Corp. 

IN74ACT251

8-INPUT DATA SELECTOR/MULTIPLEXER

WITH 3-STATE OUTPUTS

High-Speed Silicon-Gate CMOS

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

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