LS138 System Logic Semiconductor, LS138 Datasheet
LS138
Manufacturer Part Number
LS138
Description
Manufacturer
System Logic Semiconductor
Datasheet
1.LS138.pdf
(3 pages)
3-to-8-Line
Decoder/Demultiplexer
high-performance memory-decording or data-routing applications
requiring very short propagation delay time. In high-performance
memory systems this decode can be used to minimize the effects of
system decoding. When employed with high-speed memories utilizing
a fast enable circuit the delay times of this decorder and the enable time
of the memory are usually less than the typical access times of the
memory. This means that the effective system delay introduced by the
schottky-clampled system decoder is negligible.
SLS
This schottky-clamped TTL MSI circuit is designed to be used in
Designed Specifically for High Speed Memory Decoders and Data
Transmission Systems
Incorporate 3 Enabler Inputs to Simplify Cascading AND/OR Data
Reception
Schottky Clamped for High Performance
System Logic
Semiconductor
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
A2 A1 A0
FUNCTION TABLE
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
ORDERING INFORMATION
PIN ASSIGNMENT
SL74LS138N Plastic
SL74LS138D SOIC
T
for all packages
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
A
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
= 0 to 70 C
SL74LS138
Outputs
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LS138 Summary of contents
Page 1
... Incorporate 3 Enabler Inputs to Simplify Cascading AND/OR Data Reception Schottky Clamped for High Performance LOGIC DIAGRAM PIN PIN 8 = GND System Logic SLS Semiconductor ORDERING INFORMATION SL74LS138N Plastic SL74LS138D SOIC T A for all packages PIN ASSIGNMENT FUNCTION TABLE Inputs CS1 CS2 CS3 ...
Page 2
... SL74LS138 * MAXIMUM RATINGS Symbol V Supply Voltage CC V Input Voltage IN V Output Voltage OUT Tstg Storage Temperature Range * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol ...
Page 3
... 5 pF Level Min Figure 2. Switching Waveforms NOTES A. C includes probe and jig capacitance All diodes are 1N916 or 1N3064. Figure 4. Test Circuit SL74LS138 = =15 r Max Unit ...