DM7445 BCD to Decimal Decoders/Drivers
September 1986
Revised February 2000
DM7445
BCD to Decimal Decoders/Drivers
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 com-
patible for interfacing with most MOS integrated circuits.
Features
s
Full decoding of input logic
s
80 mA sink-current capability
s
All outputs are off for invalid BCD input conditions
Ordering Code:
Order Number
DM7445
Package Number
N16E
Package Description
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram
© 2000 Fairchild Semiconductor Corporation
DS006517
www.fairchildsemi.com
DM7445
Function Table
No.
D
0
1
2
3
4
5
6
7
8
9
I
N
V
A
L
I
D
H
=
HIGH Level (OFF)
L
=
LOW Level (ON)
Inputs
C
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
B
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
A
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
0
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
1
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
2
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
3
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
Outputs
4
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
5
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
6
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
7
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
8
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
9
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
Logic Diagram
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DM7445
Absolute Maximum Ratings
(Note 1)
Supply Voltage
Input Voltage
Output Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
5.5V
30V
0°C to
+70°C
−65°C
to
+150°C
Note 1:
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 tables 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
V
CC
V
IH
V
IL
V
OH
I
OL
T
A
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
LOW Level Output Current
Free Air Operating Temperature
0
Min
4.75
2
0.8
30
20
70
Nom
5
Max
5.25
Units
V
V
V
V
mA
°C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
V
I
I
CEX
V
OL
Parameter
Input Clamp Voltage
HIGH Level
Output Current
LOW Level
Output Voltage
Conditions
V
CC
=
Min, I
I
= −12
mA
V
CC
=
Min, V
O
=
30V
V
IL
=
Max, V
IH
=
Min
V
CC
=
Min, I
OL
=
Max
V
IH
=
Min, V
IL
=
Max
I
OL
=
80 mA
V
CC
=
Min
I
I
I
IH
I
IL
I
CC
Input Current @ Max Input Voltage
HIGH Level Input Current
LOW Level Input Current
Supply Current
V
CC
=
Max, V
I
=
5.5V
V
CC
=
Max, V
I
=
2.4V
V
CC
=
Max, V
I
=
0.4V
V
CC
=
Max (Note 3)
43
0.2
0.5
Min
Typ
(Note 2)
Max
−1.5
250
0.4
V
0.9
1
40
−1.6
70
mA
µA
mA
mA
Units
V
µA
Note 2:
All typicals are at V
CC
=
5V, T
A
=
25°C.
Note 3:
I
CC
is measured with all inputs grounded and all outputs OPEN.
Switching Characteristics
at V
CC
=
5V and T
A
=
25°C
Symbol
t
PLH
t
PHL
Parameter
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Conditions
C
L
=
15 pF
R
L
=
100Ω
Min
Max
49.5
49.5
Units
ns
ns
3
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DM7445 BCD to Decimal Decoders/Drivers
Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
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device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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