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© Semiconductor Components Industries, LLC, 2015
March, 2015 − Rev. 8
1
Publication Order Number:
MC74AC257/D
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
15
16
14
13
12
11
10
2
1
345
67
VCC
9
8
OE
I0c
I1c
Zc
I0d
I1d
Zd
SI0a
I1a
Za
I0b
I1b
Zb
GND
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
www.onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
ORDERING INFORMATION
SOIC−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
1
16
1
16
MARKING
DIAGRAMS
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
1
16
xxx257G
AWLYWW
xxx
257
ALYW
G
G
1
16
(Note: Microdot may be in either location)


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