MC74HC251A(2010) View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
MC74HC251A Datasheet PDF : 9 Pages
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MC74HC251A
8-Input Data Selector/
Multiplexer with
3-State Outputs
High−Performance Silicon−Gate CMOS
The MC54/74HC251 is identical in pinout to the LS251. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LSTTL outputs.
This device selects one of the eight binary Data Inputs, as
determined by the Address Inputs. The Output Enable pin must be a
low level for the selected data to appear at the outputs. If Output
Enable is high, both the Y and the Y outputs are in the
high−impedance state. This 3−state feature allows the HC251 to be
used in bus−oriented systems.
The HC251 is similar in function to the HC251 which does not have
3−state outputs.
Features
• Output Drive Capability: 10 LSTTL Loads
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2 to 6 V
• Low Input Current: 1 mA
• High Noise Immunity Characteristic of CMOS Devices
• These are Pb−Free Devices
http://onsemi.com
16
1
MARKING
DIAGRAMS
16
SOIC−16
D SUFFIX
CASE 751B
HC251AG
AWLYWW
1
16
TSSOP−16
HC
16
DT SUFFIX
251A
CASE 948F
ALYWG
G
1
1
A
WL, L
YY, Y
WW, W
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
D3 1
D2 2
16 VCC
15 D4
D1 3
14 D5
D0 4
13 D6
Y5
12 D7
Y6
OUTPUT
ENABLE
7
GND 8
11 A0
10 A1
9 A2
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
1
January, 2010 − Rev. 0
Publication Order Number:
MC74HC251A/D
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