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PDF DM74ALS138 Data sheet ( Hoja de datos )
| Número de pieza | DM74ALS138 | |
| Descripción | 3 to 8 Line Decoder/Demultiplexer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 1995
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 appli-
cations 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 intro-
duced by the decoder is negligible
The ALS138 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 inverters when
expanding A 24-line decoder can be implemented 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
Features
Y Designed specifically for high speed
Memory decoders
Data transmission systems
Y 3- to 8-line decoder incorporates 3 enable inputs to
simplify cascading and or data reception
Y Low power dissipation 23 mW typ
Y Switching specifications guaranteed over full tempera-
ture and VCC range
Y Advanced oxide-isolated ion-implanted Schottky TTL
process
Connection Diagram
Dual-In-Line Package
TL F 6111 – 1
Order Number DM74ALS138M DM74ALS138N or DM74ALS138SJ
See NS Package Number M16A M16D or N16A
C1995 National Semiconductor Corporation TL F 6111
RRD-B30M105 Printed in U S A
1 page  
Physical Dimensions inches (millimeters)
Small Outline Package (M)
Order Number DM74ALS138M
NS Package Number M16A
Small Outline Package (SJ)
Order Number DM74ALS138SJ
NS Package Number M16D
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DM74ALS138.PDF ] | |
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