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KK74HC138A Datasheet(PDF) 1 Page - KODENSHI_AUK CORP.

Part # KK74HC138A
Description  1-of-8 Decoder/Demultiplexer
Download  6 Pages
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Manufacturer  KODENSHI [KODENSHI_AUK CORP.]
Direct Link  http://www.kodenshi.co.kr
Logo KODENSHI - KODENSHI_AUK CORP.

KK74HC138A Datasheet(HTML) 1 Page - KODENSHI_AUK CORP.

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TECHNICAL DATA
KK74HC138A
1-of-8 Decoder/Demultiplexer
ORDERING INFORMATION
KK74HC138AN Plastic
KK74HC138AD SOIC
TA = -55° to 125° C for all packages
The KK74HC138A is identical in pinout to the LS/ALS138. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
The KK74HC138A decodes a three-bit Address to one-of-eight active-
low outputs. This device features three Chip Select inputs, two active-low
and one active-high to facilitate the demultiplexing, cascading, and chip-
selecting functions. The demultiplexing function is accomplished by using
the Address inputs to select the desired device output; one of the Chip
Selects is used as a data input while the other Chip Selects are held in
their active states.
• 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
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =VCC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
CS1CS2CS3
A2 A1A0
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X H
X H X
L X X
X X X
X X X
X X X
H H H H H H H H
H H H H H H H H
H H H H H H H H
H L L
H L L
H L L
H L L
L L L
L L H
L H L
L H H
L H H H H H H H
H L H H H H H H
H H L H H H H H
H H H L H H H H
H L L
H L L
H L L
H L L
H L L
H L H
H H L
H H H
H H H H L H H H
H H H H H L H H
H H H H H H L H
H H H H H H H L
H = high level (steady state)
L = low level (steady state)
X = don’t care
1


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