SN74LS138_01 datasheet(2/8 Pages) ONSEMI

Part #	SN74LS138

Description	1-of-8 Decoder/ Demultiplexer

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Manufacturer	ONSEMI [ON Semiconductor]

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SN74LS138

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2

CONNECTION DIAGRAM DIP (TOP VIEW)

Address Inputs

Enable (Active LOW) Inputs

Enable (Active HIGH) Input

Active LOW Outputs

A0 - A2

E1, E2

E3

O0 - O7

0.5 U.L.

10 U.L.

0.25 U.L.

5 U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.

HIGH

LOW

(Note a)

LOADING

PIN NAMES

NOTE:

The Flatpak version has the same

pinouts (Connection Diagram) as

the Dual InLine Package.

14

13

12

11

10

9

123

45

6

7

16

15

8

VCC O0

GND

O1

O2

O3

O4

O5

O6

A0

E1

E2

E3

O7

A1

A2

LOGIC SYMBOL

VCC = PIN 16

GND = PIN 8

15 14 13 12 11 10 9

12 3

4 5 6

12 3

A0 A1 A2

E

O0 O1 O2 O3 O4 O5 O6 O7

7

LOGIC DIAGRAM

A2

A1

A0

E1 E2 E3

O7

O6

O5

O4

O3

O2

O1

O0

VCC = PIN 16

GND = PIN 8

= Pin Numbers

3

2

1

4

5

6

7

9

15

14

13

12

11

10

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