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.
http://onsemi.com
DIP−16
N SUFFIX
CASE 648
• Multiplexer Expansion by Tying Outputs Together
• Noninverting 3−State Outputs
16
1
• Outputs Source/Sink 24 mA
• ′ACT257 Has TTL Compatible Inputs
SO−16
w These devices are available in Pb−free package(s). Specifications herein
apply to both standard and Pb−free devices. Please see our website at
www.onsemi.com for specific Pb−free orderable part numbers, or
contact your local ON Semiconductor sales office or representative.
D SUFFIX
CASE 751B
16
1
V
OE
I
I
Z
I
I
Z
d
CC
0c
1c
c
0d
1d
TSSOP−16
DT SUFFIX
CASE 948F
16
15
14
13
12
11
10
9
16
1
EIAJ−16
M SUFFIX
CASE 966
16
1
2
3
4
5
6
7
8
1
S
I
0a
I
1a
Z
I
0b
I
1b
Z
b
GND
a
ORDERING INFORMATION
Figure 1. Pinout: 16−Lead Packages Conductors
Device
Package
Shipping
(Top View)
MC74AC257N
MC74ACT257N
MC74AC257D
MC74ACT257D
MC74AC257DR2
25 Units/Rail
25 Units/Rail
PDIP−16
PDIP−16
SOIC−16
48 Units/Rail
48 Units/Rail
SOIC−16
SOIC−16
2500 Tape & Reel
MC74ACT257DR2
MC74AC257DT
2500 Tape & Reel
96 Units/Rail
SOIC−16
TSSOP−16
MC74ACT257DT
MC74AC257DTR2
96 Units/Rail
TSSOP−16
TSSOP−16
2500 Tape & Reel
MC74ACT257DTR2
MC74ACT257M
2500 Tape & Reel
50 Units/Rail
TSSOP−16
EIAJ−16
MC74AC257MEL
MC74ACT257MEL
2000 Tape & Reel
2000 Tape & Reel
EIAJ−16
EIAJ−16
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
March, 2006 − Rev. 7
MC74AC257/D