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KK74HC251AD Datasheet

  • KK74HC251AD

  • KODENSHI KOREA CORP. [8-Input Data Selector/Multiplexer wit...

  • KODENSHI

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TECHNICAL DATA
KK74HC251A
8-Input Data Selector/Multiplexer
with 3-State Outputs
High-Performance Silicon-Gate CMOS
The KK74HC251A is identical in pinout to the LS/ALS251. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
The device selects one of the eight binary Data Inputs, as determined
by the Address Inputs. The Output Enable pin must be at a low level for
the selected data to appear at the outputs. If Output Enable is high, the Y
and the Y outputs are in the high-impedance state. This 3-State feature
allows the KK74HC251A to be used in bus-oriented systems.
鈥?/div>
Outputs Directly Interface to CMOS, NMOS, and TTL
鈥?/div>
Operating Voltage Range: 2.0 to 6.0 V
鈥?/div>
Low Input Current: 1.0
碌A(chǔ)
鈥?/div>
High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
KK74HC251AN Plastic
KK74HC251AD SOIC
T
A
= -55擄 to 125擄 C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
A2
X
L
L
L
L
PIN 16 =V
CC
PIN 8 = GND
H
H
H
A1
X
L
L
H
H
L
L
H
A0
X
L
H
L
H
L
H
L
OE
H
L
L
L
L
L
L
L
Outputs
Y
Z
D0
D1
D2
D3
D4
D5
D6
Y
Z
D0
D1
D2
D3
D4
D5
D6
H H
H
L
D7
D7
D0,D1...D7=the level of the respective D
input
Z = high-impedance state
X = don鈥檛 care
1

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