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Электронный компонент: 7445

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2000 Fairchild Semiconductor Corporation
DS006517
www.fairchildsemi.com
September 1986
Revised February 2000
DM7445
BCD t
o
Deci
mal
Decoders
/
Dri
vers
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
(1015) 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:
Connection Diagram
Order Number
Package Number
Package Description
DM7445
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
www.fairchildsemi.com
2
D
M
7445
Function Table
H
=
HIGH Level (OFF)
L
=
LOW Level (ON)
Logic Diagram
No.
Inputs
Outputs
D
C
B
A
0
1
2
3
4
5
6
7
8
9
0
L
L
L
L
L
H
H
H
H
H
H
H
H
H
1
L
L
L
H
H
L
H
H
H
H
H
H
H
H
2
L
L
H
L
H
H
L
H
H
H
H
H
H
H
3
L
L
H
H
H
H
H
L
H
H
H
H
H
H
4
L
H
L
L
H
H
H
H
L
H
H
H
H
H
5
L
H
L
H
H
H
H
H
H
L
H
H
H
H
6
L
H
H
L
H
H
H
H
H
H
L
H
H
H
7
L
H
H
H
H
H
H
H
H
H
H
L
H
H
8
H
L
L
L
H
H
H
H
H
H
H
H
L
H
9
H
L
L
H
H
H
H
H
H
H
H
H
H
L
I
H
L
H
L
H
H
H
H
H
H
H
H
H
H
N
H
L
H
H
H
H
H
H
H
H
H
H
H
H
V
H
H
L
L
H
H
H
H
H
H
H
H
H
H
A
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
L
H
H
H
H
H
H
H
H
H
H
I
H
H
H
H
H
H
H
H
H
H
H
H
H
H
D
3
www.fairchildsemi.com
DM7445
Absolute Maximum Ratings
(Note 1)
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
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
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
Supply Voltage
7V
Input Voltage
5.5V
Output Voltage
30V
Operating Free Air Temperature Range
0
C to
+
70
C
Storage Temperature Range
-
65
C to
+
150
C
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
HIGH Level Input Voltage
2
V
V
IL
LOW Level Input Voltage
0.8
V
V
OH
HIGH Level Output Voltage
30
V
I
OL
LOW Level Output Current
20
mA
T
A
Free Air Operating Temperature
0
70
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
12 mA
-
1.5
V
I
CEX
HIGH Level
V
CC
=
Min, V
O
=
30V
250
A
Output Current
V
IL
=
Max, V
IH
=
Min
V
OL
LOW Level
V
CC
=
Min, I
OL
=
Max
0.2
0.4
Output Voltage
V
IH
=
Min, V
IL
=
Max
V
I
OL
=
80 mA
0.5
0.9
V
CC
=
Min
I
I
Input Current @ Max Input Voltage
V
CC
=
Max, V
I
=
5.5V
1
mA
I
IH
HIGH Level Input Current
V
CC
=
Max, V
I
=
2.4V
40
A
I
IL
LOW Level Input Current
V
CC
=
Max, V
I
=
0.4V
-
1.6
mA
I
CC
Supply Current
V
CC
=
Max (Note 3)
43
70
mA
Symbol
Parameter
Conditions
Min
Max
Units
t
PLH
Propagation Delay Time
C
L
=
15 pF
49.5
ns
LOW-to-HIGH Level Output
R
L
=
100
t
PHL
Propagation Delay Time
49.5
ns
HIGH-to-LOW Level Output
www.fairchildsemi.com
4
DM7445
BCD t
o
Deci
mal
Decoders
/
Dri
vers
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.
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
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.
2. A critical component in any component of a life support
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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