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Part Number DM7446A

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© 2000 Fairchild Semiconductor Corporation
DS006518
www.fairchildsemi.com
September 1986
Revised February 2000
DM7446A,
DM7447A
BCD t
o
7-
Segment
Decoders
/
Dri
vers
DM7446A, DM7447A
BCD to 7-Segment Decoders/Drivers
General Description
The DM7446A and DM7447A feature active-LOW outputs
designed for driving common-anode LEDs or incandescent
indicators directly. All of the circuits have full ripple-blank-
ing input/output controls and a lamp test input. Segment
identification and resultant displays are shown on a follow-
ing page. Display patterns for BCD input counts above nine
are unique symbols to authenticate input conditions.
All of the circuits incorporate automatic leading and/or trail-
ing-edge, zero-blanking control (RBI and RBO). Lamp test
(LT) of these devices may be performed at any time when
the BI/RBO node is at a HIGH logic level. All types contain
an overriding blanking input (BI) which can be used to con-
trol the lamp intensity (by pulsing) or to inhibit the outputs.
Features
s
All circuit types feature lamp intensity modulation capa-
bility
s
Open-collector outputs drive indicators directly
s
Lamp-test provision
s
Leading/trailing zero suppression
Ordering Code:
Connection Diagram
Order Number
Package Number
Package Description
DM7446AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM7446AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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2
DM
744
6A, DM
744
7A
Function Table
H
=
HIGH level,
L
=
LOW level,
X
=
Don't Care
Note 1: BI/RBO is a wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).
Note 2: The blanking input (BI) must be OPEN or held at a HIGH logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI)
must be OPEN or HIGH if blanking of a decimal zero is not desired.
Note 3: When a LOW logic level is applied directly to the blanking input (BI), all segment outputs are HIGH regardless of the level of any other input.
Note 4: When ripple-blanking input (RBI) and inputs A, B, C, and D are at a LOW level with the lamp test input HIGH, all segment outputs go H and the rip-
ple-blanking output (RBO) goes to a LOW level (response condition).
Note 5: When the blanking input/ripple-blanking output (BI/RBO) is OPEN or held HIGH and a LOW is applied to the lamp-test input, all segment outputs are
L .
Logic Diagram
Decimal or
Inputs
BI/RBO
Outputs
Note
Function
LT
RBI
D
C
B
A
(Note 1)
a
b
c
d
e
f
g
0
H
H
L
L
L
L
H
L
L
L
L
L
L
H
1
H
X
L
L
L
H
H
H
L
L
H
H
H
H
2
H
X
L
L
H
L
H
L
L
H
L
L
H
L
3
H
X
L
L
H
H
H
L
L
L
L
H
H
L
4
H
X
L
H
L
L
H
H
L
L
H
H
L
L
5
H
X
L
H
L
H
H
L
H
L
L
H
L
L
6
H
X
L
H
H
L
H
H
H
L
L
L
L
L
7
H
X
L
H
H
H
H
L
L
L
H
H
H
H
(Note 2)
8
H
X
H
L
L
L
H
L
L
L
L
L
L
L
9
H
X
H
L
L
H
H
L
L
L
H
H
L
L
10
H
X
H
L
H
L
H
H
H
H
L
L
H
L
11
H
X
H
L
H
H
H
H
H
L
L
H
H
L
12
H
X
H
H
L
L
H
H
L
H
H
H
L
L
13
H
X
H
H
L
H
H
L
H
H
L
H
L
L
14
H
X
H
H
H
L
H
H
H
H
L
L
L
L
15
H
X
H
H
H
H
H
H
H
H
H
H
H
H
BI
X
X
X
X
X
X
L
H
H
H
H
H
H
H
(Note 3)
RBI
H
L
L
L
L
L
L
H
H
H
H
H
H
H
(Note 4)
LT
L
X
X
X
X
X
H
L
L
L
L
L
L
L
(Note 5)
3
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DM7446A,
DM7447A
Absolute Maximum Ratings
(Note 6)
Note 6: 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
Supply Voltage
7V
Input Voltage
5.5V
Operating Free Air Temperature Range
0
°
C to
+
70
°
C
Storage Temperature Range
-
65
°
C to
+
150
°
C
Symbol
Parameter
Min
Nom
Max
Units
DM7446A
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 (a thru g)
30
V
I
OH
HIGH Level Output Current (BI/RBO)
-
0.2
µ
A
I
OL
LOW Level Output Current (a thru g)
40
mA
I
OL
LOW Level Output Current (BI/RBO)
8
mA
T
A
Free Air Operating Temperature
0
70
°
C
DM7447A
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 (a thru g)
15
V
I
OH
HIGH Level Output Current (BI/RBO)
-
0.2
µ
A
I
OL
LOW Level Output Current (a thru g)
40
mA
I
OL
LOW Level Output Current (BI/RBO)
8
mA
T
A
Free Air Operating Temperature
0
70
°
C
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4
DM
744
6A, DM
744
7A
DM7446A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 7: All typicals are at V
CC
=
5V, T
A
=
25
°
C.
Note 8: I
CC
is measured with all outputs OPEN and all inputs at 4.5V.
DM7446A Switching Characteristics
at V
CC
=
5V and T
A
=
25
°
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 7)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
12 mA
-
1.5
V
V
OH
HIGH Level Output
V
CC
=
Min
2.4
3.7
V
Voltage (BI/RBO)
I
OH
=
Max
I
CEX
HIGH Level Output
V
CC
=
Max, V
O
=
30V
250
µ
A
Current (a thru g)
V
IL
=
Max, V
IH
=
Min
V
OL
LOW
Level V
CC
=
Min, I
OL
=
Max
0.3
0.4
V
Output Voltage
V
IH
=
Min, V
IL
=
Max
I
I
Input Current @ Max
V
CC
=
Max, V
I
=
5.5V
1
mA
Input Voltage
(Except BI/RBO)
I
IH
HIGH Level Input
V
CC
=
Max, V
I
=
2.4V
40
µ
A
Current
(Except BI/RBO)
I
IL
LOW Level Input
V
CC
=
Max
BI/RBO
-
4
mA
Current
V
I
=
0.4V
Others
-
1.6
I
OS
Short Circuit
V
CC
=
Max
-
4
mA
Output Current
(BI/RBO)
I
CC
Supply Current
V
CC
=
Max
60
103
mA
(Note 8)
Symbol
Parameter
Conditions
Min
Max
Units
t
PLH
Propagation Delay Time
C
L
=
15 pF
100
ns
LOW-to-HIGH Level Output
R
L
=
120
t
PHL
Propagation Delay Time
100
ns
HIGH-to-LOW Level Output
5
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DM7446A,
DM7447A
DM7447A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 9: All typicals are at V
CC
=
5V, T
A
=
25
°
C.
Note 10: I
CC
is measured with all outputs OPEN and all inputs at 4.5V.
DM7447A Switching Characteristics
at V
CC
=
5V and T
A
=
25
°
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 9)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
12 mA
-
1.5
V
V
OH
HIGH Level Output
V
CC
=
Min
2.4
3.7
V
Voltage (BI/RBO)
I
OH
=
Max
I
CEX
HIGH Level Output
V
CC
=
Max, V
O
=
15V
250
µ
A
Current (a thru g)
V
IL
=
Max, V
IH
=
Min
V
OL
LOW Level Output
V
CC
=
Min, I
OL
=
Max
0.3
0.4
V
Voltage
V
IH
=
Min, V
IL
=
Max
I
I
Input Current @ Max
V
CC
=
Max, V
I
=
5.5V
1
mA
Input Voltage
I
IH
HIGH Level Input Current
V
CC
=
Max, V
I
=
2.4V
40
µ
A
I
IL
LOW Level Input
V
CC
=
Max
BI/RBO
-
4
mA
Current
V
I
=
0.4V
Others
-
1.6
I
OS
Short Circuit
V
CC
=
Max
-
4
mA
Output Current
(BI/RBO)
I
CC
Supply Current
V
CC
=
Max
60
103
mA
(Note 10)
Symbol
Parameter
Conditions
Min
Max
Units
t
PLH
Propagation Delay Time
C
L
=
15 pF
100
ns
LOW-to-HIGH Level Output
R
L
=
120
t
PHL
Propagation Delay Time
100
ns
HIGH-to-LOW Level Output