IN74HC138AD IK Semiconductor, IN74HC138AD Datasheet

IN74HC138AD

Manufacturer Part Number

IN74HC138AD

Description

Manufacturer

IK Semiconductor

Datasheet

1.IN74HC138AD.pdf (6 pages)

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1-of-8 Decoder/Demultiplexer

device inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LS/ALSTTL outputs.

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

The IN74HC138A is identical in pinout to the LS/ALS138. The

The IN74HC138A decodes a three-bit Address to one-of-eight active-

LOGIC DIAGRAM

PIN 8 = GND

PIN 16 =V

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

Inputs

FUNCTION TABLE

A2 A1 A0

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

ORDERING INFORMATION

= -55° to 125° C for all packages

PIN ASSIGNMENT

IN74HC138AN Plastic

IN74HC138AD SOIC

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

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

TECHNICAL DATA

IN74HC138A

Outputs

Rev. 00

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IN74HC138AD Summary of contents

Page 1

... 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

MAXIMUM RATINGS Symbol Parameter 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, ...

Page 3

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

Page 4

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) t ...

Page 5

Figure 3. Switching Waveforms EXPANDED LOGIC DIAGRAM IN74HC138A Figure 4. Test Circuit Rev. 00 ...

Page 6

0.25 (0.010 NOTES: 1. Dimensions “A”, “B” do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side ...

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