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PDF IN74HC138A Data sheet ( Hoja de datos )
| Número de pieza | IN74HC138A | |
| Descripción | 3-8 Decoder/Demultiplexer | |
| Fabricantes | IK Semiconductor | |
| Logotipo |  |
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1-of-8 Decoder/Demultiplexer
TECHNICAL DATA
IN74HC138A
The IN74HC138A is identical in pinout to the LS/ALS138. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
The IN74HC138A decodes a three-bit Address to one-of-eight active-
low outputs. This device features three Chip Select inputs, two active-low
and one active-high to facilitate the demultiplexing, cascading, and chip-
selecting functions. The demultiplexing function is accomplished by using
the Address inputs to select the desired device output; one of the Chip
Selects is used as a data input while the other Chip Selects are held in
their active states.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
IN74HC138AN Plastic
IN74HC138AD SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =VCC
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FUNCTION TABLE
Inputs
Outputs
CS1CS2CS3 A2 A1A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
XXH
XHX
LXX
XXX
XXX
XXX
H H H HHHHH
H H H HHHHH
H H H HHHHH
HLL
HLL
HLL
HLL
LLL
LLH
LHL
LHH
L H H HHHHH
H L H HHHHH
H H L HHHHH
H H H LHHHH
HLL
HLL
HLL
HLL
HLL
HLH
HHL
HHH
H H H HLHHH
H H H HHLHH
H H H HHHLH
H H H HHHHL
H = high level (steady state)
L = low level (steady state)
X = don’t care
1
1 page  
IN74HC138A
Figure 3. Switching Waveforms
Figure 4. Test Circuit
EXPANDED LOGIC DIAGRAM
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5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IN74HC138A.PDF ] | |
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