dm74als138 Fairchild Semiconductor, dm74als138 Datasheet
dm74als138
Manufacturer Part Number
dm74als138
Description
Dm74als138 3 To 8 Line Decoder/demultiplexer
Manufacturer
Fairchild Semiconductor
Datasheet
1.DM74ALS138.pdf
(6 pages)
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dm74als138N
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© 2000 Fairchild Semiconductor Corporation
DM74ALS138M
DM74ALS138SJ
DM74ALS138N
DM74ALS138
3 to 8 Line Decoder/Demultiplexer
General Description
These Schottky-clamped circuits are designed to be used
in high-performance memory-decoding or data-routing
applications, requiring very short propagation delay times.
In high-performance memory systems these decoders can
be used to minimize the effects of system decoding. When
used with high-speed memories, the delay times of these
decoders are usually less than the typical access time of
the memory. This means that the effective system delay
introduced by the decoder is negligible.
The DM74ALS138 decodes one-of-eight lines, based upon
the conditions at the three binary select inputs and the
three enable inputs. Two active-LOW and one active-HIGH
enable inputs reduce the need for external gates or invert-
ers when expanding. A 24-line decoder can be imple-
mented with no external inverters, and 32-line decoder
requires only one inverter. An enable input can be used as
a data input for demultiplexing applications.
This decoder/demultiplexer features fully buffered inputs,
presenting only one normalized load to its driving circuit. All
inputs are clamped with high-performance Schottky diodes
to suppress line-ringing and simplify system design.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Order Number
Package Number
M16A
M16D
N16E
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DS006111
Features
Function Table
Note 1: G2
G1
H
H
H
H
H
H
H
H
X
L
Designed specifically for high speed:
3- to 8-line decoder incorporates 3 enable inputs to sim-
plify cascading and/or data reception
Low power dissipation…23 mW typ
Switching specifications guaranteed over full tempera-
ture and V
Advanced oxide-isolated, ion-implanted Schottky TTL
process
Enable
Inputs
Memory decoders
Data transmission systems
(Note 1)
Package Description
G2
H
X
L
L
L
L
L
L
L
L
G2A
CC
C
X
X
H
H
H
H
L
L
L
L
range
G2B
Select
Inputs
B
X
X
H
H
H
H
L
L
L
L
A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X
X
H
H
H
H
L
L
L
L
H
H
H
H
H
H
H
H
H
L
September 1986
Revised February 2000
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
www.fairchildsemi.com
Outputs
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
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Datasheet:
dm74als138 Summary of contents
Page 1
... This means that the effective system delay introduced by the decoder is negligible. The DM74ALS138 decodes one-of-eight lines, based upon the conditions at the three binary select inputs and the three enable inputs. Two active-LOW and one active-HIGH enable inputs reduce the need for external gates or invert- ers when expanding ...
Page 2
Logic Diagram www.fairchildsemi.com 2 ...
Page 3
Absolute Maximum Ratings Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package Recommended Operating Conditions Symbol Parameter V Supply Voltage CC V HIGH Level Input Voltage IH V LOW Level Input ...
Page 4
Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow www.fairchildsemi.com Package Number M16A 4 ...
Page 5
Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 5 www.fairchildsemi.com ...
Page 6
Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right ...