74AC257 Просмотр технического описания (PDF) - ON Semiconductor
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74AC257 Datasheet PDF : 12 Pages
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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
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.
VCC OE I0c I1c Zc I0d I1d Zd
16 15 14 13 12 11 10 9
http://onsemi.com
16
1
16
1
16
1
DIP−16
N SUFFIX
CASE 648
SO−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
12345678
S I0a I1a Za I0b I1b Zb GND
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
16
1
EIAJ−16
M SUFFIX
CASE 966
ORDERING INFORMATION
Device
Package
Shipping
MC74AC257N
PDIP−16 25 Units/Rail
MC74ACT257N
MC74AC257D
PDIP−16
SOIC−16
25 Units/Rail
48 Units/Rail
MC74ACT257D
MC74AC257DR2
SOIC−16 48 Units/Rail
SOIC−16 2500 Tape & Reel
MC74ACT257DR2 SOIC−16 2500 Tape & Reel
MC74AC257DT TSSOP−16 96 Units/Rail
MC74ACT257DT TSSOP−16 96 Units/Rail
MC74AC257DTR2 TSSOP−16 2500 Tape & Reel
MC74ACT257DTR2 TSSOP−16 2500 Tape & Reel
MC74ACT257M
EIAJ−16 50 Units/Rail
MC74AC257MEL EIAJ−16 2000 Tape & Reel
MC74ACT257MEL EIAJ−16 2000 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 7
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 8 of this data sheet.
1
Publication Order Number:
MC74AC257/D
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