KK74HC251A Datasheet, PDF (1/6 Pages) KODENSHI KOREA CORP. – 8-Input Data Selector/Multiplexer with 3-State Outputs High-Performance Silicon-Gate CMOS

TECHNICAL DATA
8-Input Data Selector/Multiplexer
with 3-State Outputs
High-Performance Silicon-Gate CMOS
KK74HC251A
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.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
KK74HC251AN Plastic
KK74HC251AD SOIC
T_A = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =V_CC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
A2 A1 A0 OE Y Y
XX X
H
ZZ
LL L
L D0 D0
LL H
L D1 D1
LH L
L D2 D2
LH H
L D3 D3
HL L
L D4 D4
HL H
L D5 D5
HH L
L D6 D6
HH H
L D7 D7
D0,D1...D7=the level of the respective D
input
Z = high-impedance state
X = don’t care
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