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TL/F/6516
5442A/DM5442A/DM7442A BCD to Decimal Decoders
June 1989
5442A/DM5442A/DM7442A
BCD to Decimal Decoders
General Description
These BCD-to-decimal decoders consist of eight inverters
and ten, four-input NAND gates. The inverters are connected 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 conditions.
Features
Y
Diode clamped inputs
Y
Also for application as 4-line-to-16-line decoders; 3-lineto-8-line decoders
Y
All outputs are high for invalid input conditions
Y
Typical power dissipation 140 mW
Y
Typical propagation delay 17 ns
Y
Alternate Military/Aerospace device (5442A) is available. Contact a National Semiconductor Sales Office/
Distributor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6516– 1
Order Number 5442ADMQB, 5442AFMQB, DM5442AJ, DM5442AW or DM7442AN
See NS Package Number J16A, N16E or W16A
Function Table
No.
BCD Input Decimal Output
DCBA0123456789
0 L L L L LHHHHHHHHH
1 L L L HHLHHHHHHHH
2 L L HL HHLHHHHHHH
3 L L HHHHHL HHHHHH
4 LHL L HHHHLHHHHH
5 LHL HHHHHHL HHHH
6 LHHLHHHHHHLHHH
7 LHHHHHHHHHHL HH
8 H L L L HHHHHHHHL H
9 H L LHHHHHHHHHHL
I H LHL HHHHHHHHHH
N H LHHHHHHHHHHHH
V HHL LHHHHHHHHHH
A HHL HHHHHHHHHHH
L HHH LHHHHHHHHHH
I HHHHHHHHHHHHHH
D
HeHigh Level
L
e
Low Level
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
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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 5.5V
Operating Free Air Temperature Range
DM54 and 54
b
55§Ctoa125§C
DM74 0
§
Ctoa70§C
Storage Temperature Range
b
65§Ctoa150§C
Note:
The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaranteed. 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 Parameter
DM5442A DM7442A
Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V
IH
High Level Input Voltage 2 2 V
V
IL
Low Level Input Voltage 0.8 0.8 V
I
OH
High Level Output Current
b
0.8
b
0.8 mA
I
OL
Low Level Output Current 16 16 mA
T
A
Free Air Operating Temperature
b
55 125 0 70
§
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units
(Note 1)
V
I
Input Clamp Voltage V
CC
e
Min, I
I
eb
12 mA
b
1.5 V
V
OH
High Level Output V
CC
e
Min, I
OH
e
Max
2.4 3.4 V
Voltage V
IL
e
Max, V
IH
e
Min
V
OL
Low Level Output V
CC
e
Min, I
OL
e
Max
0.2 0.4 V
Voltage V
IH
e
Min, V
IL
e
Max
I
I
Input Current@Max V
CC
e
Max, V
I
e
5.5V
1mA
Input Voltage
I
IH
High Level Input Current V
CC
e
Max, V
I
e
2.4V 40 mA
I
IL
Low Level Input Current V
CC
e
Max, V
I
e
0.4V
b
1.6 mA
I
OS
Short Circuit V
CC
e
Max DM54
b
20
b
55
mA
Output Current (Note 2)
DM74
b
18
b
55
I
CC
Supply Current V
CC
e
Max DM54 28 41
mA
(Note 3)
DM74 28 56
Note 1: All typicals are at V
CC
e
5V, T
A
e
25§C.
Note 2: Not more than one output should be shorted at a time.
Note 3: I
CC
is measured with all outputs open and all inputs grounded.
2
Page 3
Switching Characteristics at V
CC
e
5V and T
A
e
25§C (See Section 1 for Test Waveforms and Output Load)
Symbol Parameter Conditions Min Max Units
t
PHL
Propagation Delay Time C
L
e
15 pF
High to Low Level Output R
L
e
400X
25 ns
from A, B, C or D through
2 Levels of Logic
t
PHL
Propagation Delay Time
High to Low Level Output
30 ns
from A, B, C or D through
3 Levels of Logic
t
PLH
Propagation Delay Time
Low to High Level Output
25 ns
from A, B, C or D through
2 Levels of Logic
t
PLH
Propagation Delay Time
Low to High Level Output
30 ns
from A, B, C or D through
3 Levels of Logic
Logic Diagram
Tl/F/6516– 2
3
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4
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Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 5442ADMQB or DM5442AJ
NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM7442AN
NS Package Number N16E
5
Page 6
5442A/DM5442A/DM7442A BCD to Decimal Decoders
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 5442AFMQB or DM5442AW
NS Package Number W16A
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