54LS138 Motorola, 54LS138 Datasheet

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54LS138

Manufacturer Part Number
54LS138
Description
Decoders/Demultiplexers 54LS1383-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS 54LS1381-OF-8 DECODER/ DEMULTIPLEXER
Manufacturer
Motorola
Datasheet

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1-OF-8 DECODER/
DEMULTIPLEXER
Demultiplexer. This device is ideally suited for high speed bipolar memory
chip select address decoding. The multiple input enables allow parallel ex-
pansion to a 1-of-24 decoder using just three LS138 devices or to a 1-of-32
decoder using four LS138s and one inverter. The LS138 is fabricated with the
Schottky barrier diode process for high speed and is completely compatible
with all Motorola TTL families.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
LOGIC DIAGRAM
PIN NAMES
A 0 – A 2
E 1 , E 2
E 3
O 0 – O 7
Temperature Ranges.
The LSTTL / MSI SN54 / 74LS138 is a high speed 1-of-8 Decoder /
Demultiplexing Capability
Multiple Input Enable for Easy Expansion
Typical Power Dissipation of 32 mW
Active Low Mutually Exclusive Outputs
Input Clamp Diodes Limit High Speed Termination Effects
V CC
A 0
16
1
3
A 2
O 0
15
A 1
7
2
O 7
CONNECTION DIAGRAM DIP (TOP VIEW)
2
O 1
14
A 2
A 1
3
9
Address Inputs
Enable (Active LOW) Inputs
Enable (Active HIGH) Input
Active LOW Outputs (Note b)
O 6
1
O 2
13
E 1
4
A 0
10
O 5
O 3
12
E 2
5
11
O 4
O 4
E 3
11
6
12
4
O 5
E 1 E 2 E 3
O 3
10
O 7
7
5
13
GND
O 6
9
8
O 2
6
FAST AND LS TTL DATA
14
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
O 1
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
LOADING (Note a)
HIGH
V CC = PIN 16
GND = PIN 8
15
= PIN NUMBERS
O 0
5-230
5 (2.5) U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
LOW
16
16
SN54/74LS138
ORDERING INFORMATION
16
LOW POWER SCHOTTKY
1
1
SN54LSXXXJ
SN74LSXXXN Plastic
SN74LSXXXD SOIC
1-OF-8 DECODER/
O 0 O 1 O 2 O 3 O 4 O 5 O 6 O 7
15 14 13 12 11 10 9
DEMULTIPLEXER
1
LOGIC SYMBOL
A 0 A 1 A 2
1 2 3
V CC = PIN 16
GND = PIN 8
Ceramic
CASE 751B-03
CASE 620-09
CASE 648-08
CERAMIC
N SUFFIX
D SUFFIX
J SUFFIX
PLASTIC
4 5 6
1 2 3
SOIC
E
7

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54LS138 Summary of contents

Page 1

... LS138 devices 1-of-32 decoder using four LS138s and one inverter. The LS138 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families. Demultiplexing Capability Multiple Input Enable for Easy Expansion ...

Page 2

FUNCTIONAL DESCRIPTION The LS138 is a high speed 1-of-8 Decoder/Demultiplexer fabricated with the low power Schottky barrier diode process. The decoder accepts three binary weighted inputs ( and when enabled provides eight ...

Page 3

GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High I OL Output Current — Low DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE Symbol Symbol Parameter Parameter V IH Input ...

Page 4

G - 0.25 (0.010 - SEATING -T- PLANE 0.25 (0.010) ...

Page 5

... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “ ...

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