National Semiconductor DM5445, DM7445 Technical data
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DM5445/DM7445 BCD to Decimal Decoders/Drivers
DM5445/DM7445 BCD to Decimal Decoders/Drivers
June 1989
General Description
These BCD-to-decimal decoders/drivers 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 BCD input
logic ensures that all outputs remain off for all invalid
(10–15) binary input conditions. These decoders feature
high-performance, NPN output transistors designed for use
as indicator/relay drivers, or as open-collector logic-circuit
drivers. The high-breakdown output transistors are compatible for interfacing with most MOS integrated circuits.
Connection Diagram
Dual-In-Line Package
TL/F/6517– 1
Order Number DM5445J, DM5445W or DM7445N
See NS Package Number J16A, N16E or W16A
Features
Y
Full decoding of input logic
Y
80 mA sink-current capability
Y
All outputs are off for invalid BCD input conditions
Function Table
Inputs Outputs
No.
DCBA0123456789
0 L L L L LHHHHHHHHH
1 L L LHH L HHHHHHHH
2 L L H L HHLHHHHHHH
3 L L HHHHH L HHHHHH
4 LHL LHHHH L HHHHH
5 LHL HHHHHH L HHHH
6 LHHLHHHHHHLHHH
7 LHHHHHHHHHHL HH
8 H L LLHHHHHHHH L H
9 H L LHHHHHHHHHHL
I H L H LHHHHHHHHHH
N H L HHHHHHHHHHHH
V HHL L HHHHHHHHHH
A HHL HHHHHHHHHHH
L HHH L HHHHHHHHHH
I HHHHHHHHHHHHHH
D
HeHigh Level (Off), LeLow Level (On)
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
TL/F/6517
Absolute Maximum Ratings (Note)
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
Output Voltage 30V
Operating Free Air Temperature Range
DM54
DM74 0
Storage Temperature Range
b
55§Ctoa125§C
Ctoa70§C
§
b
65§Ctoa150§C
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
V
CC
V
IH
V
IL
V
OH
I
OL
T
A
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
High Level Input Voltage 2 2 V
Low Level Input Voltage 0.8 0.8 V
High Level Output Voltage 30 30 V
Low Level Output Current 20 20 mA
Free Air Operating Temperature
DM5445 DM7445
Min Nom Max Min Nom Max
b
55 125 0 70
Units
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
e
V
I
CEX
V
I
I
I
IH
I
IL
I
CC
I
OL
Input Clamp Voltage V
High Level Output V
Current V
Low Level Output V
Voltage V
Input Current@Max V
Input Voltage
High Level Input Current V
Low Level Input Current V
Supply Current V
CC
CC
e
IL
CC
e
IH
e
I
OL
V
CC
CC
CC
CC
CC
(Note 2)
eb
e
Max, V
e
Min, V
Min, I
Min, V
Min, I
12 mA
I
e
30V
O
e
Min
IH
e
Max
OL
e
Max
IL
80 mA
e
Min
e
e
e
e
e
Max, V
Max, V
Max, V
5.5V
I
e
2.4V 40 mA
I
e
0.4V
I
Max DM54 43 62
DM74 43 70
Typ
(Note 1)
0.2 0.4
0.5 0.9
Max Units
b
1.5 V
250 mA
1mA
b
1.6 mA
mA
C
§
V
Switching Characteristics at V
CC
e
5V and T
e
25§C (See Section 1 for Test Waveforms and Output Load)
A
Symbol Parameter Conditions Min Max Units
t
PLH
t
PHL
Note 1: All typicals are at V
Note 2: I
is measured with all inputs grounded and all outputs open.
CC
Propagation Delay Time C
Low to High Level Output R
Propagation Delay Time
High to Low Level Output
e
e
5V, T
CC
25§C.
A
e
15 pF
L
e
100X
L
49.5 ns
49.5 ns
2
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