SN74LS138
1-of-8 Decoder/
Demultiplexer
The LSTTL/MSI SN74LS138 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 expansion 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 ON Semiconductor
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
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
IOL
Parameter
Supply Voltage
Operating Ambient
Temperature Range
Output Current – High
Output Current – Low
Min
4.75
0
Typ
5.0
25
Max
5.25
70
–0.4
8.0
Unit
V
°C
mA
mA
16
1
http://onsemi.com
LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
SOIC
D SUFFIX
CASE 751B
16
1
SOEIAJ
M SUFFIX
CASE 966
ORDERING INFORMATION
Device
SN74LS138N
SN74LS138D
SN74LS138DR2
SN74LS138M
SN74LS138MEL
Package
16 Pin DIP
SOIC–16
SOIC–16
SOEIAJ–16
SOEIAJ–16
Shipping
2000 Units/Box
38 Units/Rail
2500/Tape & Reel
See Note 1
See Note 1
1. For ordering information on the EIAJ version of
the SOIC package, please contact your local
ON Semiconductor representative.
©
Semiconductor Components Industries, LLC, 2001
1
October, 2001 – Rev. 7
Publication Order Number:
SN74LS138/D