74LS154 Decoders/Demultiplexers Datasheet

74LS154 Datasheet, PDF, Equivalent


Part Number

74LS154

Description

4-Line to 16-Line Decoders/Demultiplexers

Manufacture

National Semiconductor

Total Page 6 Pages
Datasheet
Download 74LS154 Datasheet


74LS154
May 1989
DM54LS154 DM74LS154 4-Line to 16-Line
Decoders Demultiplexers
General Description
Each of these 4-line-to-16-line decoders utilizes TTL circuit-
ry to decode four binary-coded inputs into one of sixteen
mutually exclusive outputs when both the strobe inputs G1
and G2 are low The demultiplexing function is performed
by using the 4 input lines to address the output line passing
data from one of the strobe inputs with the other strobe
input low When either strobe input is high all outputs are
high These demultiplexers are ideally suited for implement-
ing high-performance memory decoders All inputs are buff-
ered and input clamping diodes are provided to minimize
transmission-line effects and thereby simplify system de-
sign
Features
Y Decodes 4 binary-coded inputs into one of 16 mutually
exclusive outputs
Y Performs the demultiplexing function by distributing data
from one input line to any one of 16 outputs
Y Input clamping diodes simplify system design
Y High fan-out low-impedance totem-pole outputs
Y Typical propagation delay
3 levels of logic 23 ns
Strobe 19 ns
Y Typical power dissipation 45 mW
Connection and Logic Diagrams
Dual-In-Line Package
TL F 6394–1
Order Number DM54LS154J
DM74LS154WM or DM74LS154N
See NS Package Number J24A M24B or N24A
C1995 National Semiconductor Corporation TL F 6394
TL F 6394 – 2
RRD-B30M105 Printed in U S A

74LS154
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS
b55 C to a125 C
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Min
45
2
b55
DM54LS154
Nom
5
Max
55
07
b0 4
4
125
Min
4 75
2
0
DM74LS154
Nom
5
Max
5 25
08
b0 4
8
70
Units
V
V
V
mA
mA
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
Input Clamp Voltage
High Level Output
Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
DM54
DM74
25
27
VOL Low Level Output
Voltage
VCC e Min IOL e Max
VIL e Max VIH e Min
DM54
DM74
IOL e 4 mA VCC e Min
DM74
II
Input Current Max
VCC e Max VI e 7V
Input Voltage
IIH
High Level Input Current
VCC e Max VI e 2 7V
IIL
Low Level Input Current
VCC e Max VI e 0 4V
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b20
b20
ICC Supply Current
VCC e Max (Note 3)
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
Note 3 ICC is measured with all outputs open and all inputs grounded
Typ
(Note 1)
34
34
0 25
0 35
0 25
9
Max
b1 5
04
05
04
01
20
b0 4
b100
b100
14
Units
V
V
V
mA
mA
mA
mA
mA
Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
RL e 2 kX
CL e 15 pF
CL e 50 pF
Min Max Min Max
Units
tPLH
Propagation Delay Time
Data to
Low to High Level Output
Output
30 35 ns
tPHL
Propagation Delay Time
Data to
High to Low Level Output
Output
30 35 ns
tPLH
Propagation Delay Time
Strobe to
Low to High Level Output
Output
20 25 ns
tPHL
Propagation Delay Time
Strobe to
High to Low Level Output
Output
25 35 ns
2


Features DM54LS154 DM74LS154 4-Line to 16-Line De coders Demultiplexers May 1989 DM54LS 154 DM74LS154 4-Line to 16-Line Decoder s Demultiplexers General Description Ea ch of these 4-line-to-16-line decoders utilizes TTL circuitry to decode four b inary-coded inputs into one of sixteen mutually exclusive outputs when both th e strobe inputs G1 and G2 are low The d emultiplexing function is performed by using the 4 input lines to address the output line passing data from one of th e strobe inputs with the other strobe i nput low When either strobe input is hi gh all outputs are high These demultipl exers are ideally suited for implementi ng high-performance memory decoders All inputs are buffered and input clamping diodes are provided to minimize transm ission-line effects and thereby simplif y system design Features Y Y Y Y Y Y Decodes 4 binary-coded inputs into on e of 16 mutually exclusive outputs Perf orms the demultiplexing function by dis tributing data from one input line to any one of 16 outputs Inp.
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