QUAD 2-INPUT MULTIPLEXER
Quad 2-Input Multiplexer with 3-State Outputs
MC74AC257, MC74ACT257
The MC74AC257/74ACT257 is a quad 2−input multiplexer...
Description
Quad 2-Input Multiplexer with 3-State Outputs
MC74AC257, MC74ACT257
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
DATA SHEET www.onsemi.com
16 1
16 1
MARKING DIAGRAMS
16 SOIC−16 D SUFFIX CASE 751B
1
XXXXXXG AWLYWW
TSSOP−16 DT SUFFIX CASE 948F
16
XXX XXX ALYWG
G
1
XXX A WL, L Y WW, W G or G
= Specific Device Code = Assembly Location = Wafer Lot = Year = Work Week = 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.
12345678 S I0a I1a Za I0b I1b Zb GND Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
© Semiconductor Components Industries, LLC, 2015
1
February, 2024 − Rev. 9
Publication Order Number: MC74AC257/D
MC74AC257, MC74ACT257
PIN NAME PIN S OE I0a−I0d I1a−I1d Za−Zd
FUNCTION Common Data Select Input 3−State Output Enable ...
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