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Teilenummer | 54LS138 |
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Beschreibung | 1-OF-8 DECODER/ DEMULTIPLEXER | |
Hersteller | Motorola Semiconductors | |
Logo | ||
Gesamt 5 Seiten ( DataSheet : www.DataSheet4U.com )
1-OF-8 DECODER/
DEMULTIPLEXER
The LSTTL / MSI SN54 / 74LS138 is a high speed 1-of-8 Decoder /
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.
• 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
CONNECTION DIAGRAM DIP (TOP VIEW)
V CC O 0 O 1 O 2 O 3 O 4 O 5 O 6
16 15 14 13 12 11 10 9
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1 2 3 4 56
78
A 0 A 1 A 2 E 1 E 2 E 3 O 7 GND
PIN NAMES
LOADING (Note a)
HIGH
LOW
A0 – A2
E1, E2
E3
O0 – O7
Address Inputs
Enable (Active LOW) Inputs
Enable (Active HIGH) Input
Active LOW Outputs (Note b)
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA 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)
Temperature Ranges.
LOGIC DIAGRAM
A2
3
A1
2
A0
1
E1 E2 E3
45
6
V CC = PIN 16
GND = PIN 8
= PIN NUMBERS
7
O7
9
O6
10
O5
11
O4
12
O3
13
O2
14
O1
15
O0
www.DataSheet4U.com
FAST AND LS TTL DATA
5-230
SN54/74LS138
1-OF-8 DECODER/
DEMULTIPLEXER
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
123
456
12 3
A0 A1 A2
E
O0 O1 O2 O3 O4 O5 O6 O7
15 14 13 12 11 10 9
7
V CC = PIN 16
GND = PIN 8
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Seiten | Gesamt 5 Seiten | |
PDF Download | [ 54LS138 Schematic.PDF ] |
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