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MC74AC257DR2G

Quad 2-Input Multiplexer with 3-State Outputs

ON Semiconductor 

MC74AC257, MC74ACT257

Quad 2-Input Multiplexer

with 3-State Outputs

The MC74AC257/74ACT257 is a quad 2−input multiplexer with

3−state outputs. Four bits of data from two sources can be selected

using a Common Data Select input. The four outputs present the

selected data in true (noninverted) form. The outputs may be switched

to a high impedance state by placing a logic HIGH on the common

Output Enable (OE) input, allowing the outputs to interface directly

with bus−oriented systems.

• Multiplexer Expansion by Tying Outputs Together

• Noninverting 3−State Outputs

• Outputs Source/Sink 24 mA

• ′ACT257 Has TTL Compatible Inputs

• These are Pb−Free Devices

VCC OE I0c I1c Zc I0d I1d Zd

16 15 14 13 12 11 10 9

12345678

S I0a I1a Za I0b I1b Zb GND

Figure 1. Pinout: 16−Lead Packages Conductors

(Top View)

www.onsemi.com

16

1

16

1

MARKING

DIAGRAMS

16

SOIC−16

D SUFFIX

CASE 751B

1

xxx257G

AWLYWW

TSSOP−16

DT SUFFIX

CASE 948F

16

xxx

257

ALYWG

G

1

xxx

= AC or ACT

A

= Assembly Location

WL or L = Wafer Lot

Y

= Year

WW or W = Work Week

G or G = Pb−Free Package

(Note: Microdot may be in either location)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 7 of this data sheet.

© Semiconductor Components Industries, LLC, 2015

1

March, 2015 − Rev. 8

Publication Order Number:

MC74AC257/D

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