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National Semiconductor Electronic Components Datasheet

54LS42 Datasheet

BCD/Decimal Decoders

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June 1989
54LS42 DM54LS42 DM74LS42 BCD Decimal Decoders
General Description
These BCD-to-decimal decoders consist of eight inverters
and ten four-input NAND gates The inverters are connect-
ed in pairs to make BCD input data available for decoding
by the NAND gates Full decoding of input logic ensures
that all outputs remain off for all invalid (10–15) input condi-
tions
Connection Diagram
Dual-In-Line Package
TL F 6365 – 1
Order Number 54LS42DMQB 54LS42FMQB
DM54LS42J DM54LS42W DM74LS42M or DM74LS42N
See NS Package Number J16A M16A N16E or W16A
Logic Diagram
Features
Y Diode clamped inputs
Y Also for applications as 4-line-to-16-line decoders 3-
line-to-8-line decoders
Y All outputs are high for invalid input conditions
Y Alternate Military Aerospace device (54LS42) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Function Table
No BCD Inputs
Decimal Outputs
DCBA0 1 2 3 4 5 6 7 8 9
0 L L L L LHHHHHHHHH
1 L L LHHLHHHHHHHH
2 L LHLHHLHHHHHHH
3 L LHHHHHLHHHHHH
4 LHL LHHHHLHHHHH
5 LHLHHHHHHLHHHH
6 LHHLHHHHHHLHHH
7 LHHHHHHHHHHLHH
8 HL L LHHHHHHHHLH
9 HL LHHHHHHHHHHL
I
N
V
A
L
I
D
H L H L HHHHHHHHHH
H L HHHHHHHHHHHH
HHL LHHHHHHHHHH
HH L HHHHHHHHHHH
HHH L HHHHHHHHHH
HHHHHHHHHHHHHH
H e High Level
L e Low Level
C1995 National Semiconductor Corporation TL F 6365
TL F 6365 – 2
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

54LS42 Datasheet

BCD/Decimal Decoders

No Preview Available !

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 and 54LS
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
DM54LS42
Nom
5
Max
55
07
b0 4
4
125
Min
4 75
2
0
DM74LS42
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
7
Max
b1 5
04
05
04
01
20
b0 4
b100
b100
13
Units
V
V
V
mA
mA
mA
mA
mA
2


Part Number 54LS42
Description BCD/Decimal Decoders
Maker National Semiconductor
Total Page 6 Pages
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