IN74HC138AD Integral Corp., IN74HC138AD Datasheet

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IN74HC138AD

Manufacturer Part Number
IN74HC138AD
Description
1-of-8 decoder/demultiplexer, high-performance silicon-gate CMOS
Manufacturer
Integral Corp.
Datasheet
1-of-8 Decoder/Demultiplexer
High-Performance Silicon-Gate CMOS
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
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.
The IN74HC138A is identical in pinout to the LS/ALS138. The
The IN74HC138A decodes a three-bit Address to one-of-eight
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0 A
High Noise Immunity Characteristic of CMOS Devices
LOGIC DIAGRAM
PIN 8 = GND
PIN 16 =V
CC
H = high level (steady state)
L = low level (steady state)
X = don’t care
CS1 CS2 CS3
X X H
X H X
L X X
H L L
H L L
H L L
H L L
H L L
H L L
H L L
H L L
Inputs
FUNCTION TABLE
A2 A1 A0
X X X
X X X
X X X
H H H
L H H
H L H
H H L
L L H
L H L
H L L
L L L
T
A
ORDERING INFORMATION
= -55 to 125 C for all packages
PIN ASSIGNMENT
TECHNICAL DATA
IN74HC138AN Plastic
IN74HC138AD SOIC
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
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 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 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
IN74HC138A
Outputs
141

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IN74HC138AD Summary of contents

Page 1

... Low Input Current: 1.0 A High Noise Immunity Characteristic of CMOS Devices LOGIC DIAGRAM PIN PIN 8 = GND TECHNICAL DATA IN74HC138A ORDERING INFORMATION IN74HC138AN Plastic IN74HC138AD SOIC T = -55 to 125 C for all packages A PIN ASSIGNMENT FUNCTION TABLE Inputs CS1 CS2 CS3 ...

Page 2

IN74HC138A * MAXIMUM RATINGS Symbol V DC Supply Voltage (Referenced to GND Input Voltage (Referenced to GND Output Voltage (Referenced to GND) OUT I DC Input Current, per Pin Output Current, ...

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DC ELECTRICAL CHARACTERISTICS Symbol Parameter V Minimum High-Level IH Input Voltage V Maximum Low - IL Level Input Voltage V Minimum High-Level OH Output Voltage V Maximum Low-Level OL Output Voltage I Maximum Input IN Leakage Current I Maximum Quiescent ...

Page 4

IN74HC138A AC ELECTRICAL CHARACTERISTICS Symbol Parameter Maximum Propagation Delay, Input A to PLH PHL Output Y (Figures 1 and Maximum Propagation Delay , CS1 to PLH PHL Output Y (Figures 2 and 4) ...

Page 5

Figure 3. Switching Waveforms EXPANDED LOGIC DIAGRAM IN74HC138A Figure 4. Test Circuit 145 ...

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