7447 [NSC]
BCD to 7-Segment Decoders/Drivers; BCD到7段解码器/驱动器
| 型号： | 7447 |
| 厂家： | 
National Semiconductor |
| 描述： | BCD to 7-Segment Decoders/Drivers |
| 文件： | 总6页 (文件大小：121K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
DM7446A, DM5447A/DM7447A
BCD to 7-Segment Decoders/Drivers
General Description
The 46A and 47A feature active-low outputs designed for
driving common-anode LEDs or incandescent indicators di-
rectly. All of the circuits have full ripple-blanking input/out-
put controls and a lamp test input. Segment identification
and resultant displays are shown on a following page. Dis-
play patterns for BCD input counts above nine are unique
symbols to authenticate input conditions.
an overriding blanking input (BI) which can be used to con-
trol the lamp intensity (by pulsing) or to inhibit the outputs.
Features
Y
All circuit types feature lamp intensity modulation
capability
Y
Open-collector outputs drive indicators directly
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
Y
Lamp-test provision
Y
Leading/trailing zero suppression
Connection Diagram
Dual-In-Line Package
TL/F/6518–1
Order Number DM5447AJ, DM7446AN or DM7447AN
See NS Package Number J16A or N16E
C
1995 National Semiconductor Corporation
TL/F/6518
RRD-B30M105/Printed in U. S. A.
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed. 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.
Supply Voltage
Input Voltage
7V
5.5V
Operating Free Air Temperature Range
DM54
DM74
b
b
a
55 C to 125 C
§
0 C to 70 C
§
a
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
DM7446A
Units
Symbol
Parameter
Min
4.75
2
Nom
Max
V
V
V
V
Supply Voltage
5
5.25
V
V
CC
High Level Input Voltage
IH
Low Level Input Voltage
0.8
30
V
IL
High Level Output Voltage (a thru g)
High Level Output Current (BI/RBO)
Low Level Output Current (a thru g)
Low Level Output Current (BI/RBO)
Free Air Operating Temperature
V
OH
b
I
I
I
0.2
mA
mA
mA
OH
40
OL
OL
8
T
A
0
70
C
§
’46A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
e
e b
Min, I
I
b
1.5
V
V
Input Clamp Voltage
V
V
12 mA
V
V
I
CC
High Level Output
Voltage (BI/RBO)
Min
OH
CC
OH
2.4
3.7
0.3
e
I
Max
e
e
Max, V
O
I
High Level Output
Current (a thru g)
V
V
30V
Min
CEX
CC
250
0.4
1
mA
V
e
e
Max, V
IH
IL
e
e
Max
V
OL
Low Level Output
Voltage
V
V
Min, I
OL
CC
e
e
Min, V
Max
IH
IL
@
Input Current Max
e e
Max, V
I
I
I
I
V
5.5V
I
CC
mA
mA
mA
Input Voltage
(Except BI/RBO)
e
e
2.4V
High Level Input
Current
V
Max, V
I
IH
IL
CC
(Except BI/RBO)
40
e
b
4
Low Level Input
Current
V
V
Max
BI/RBO
Others
CC
e
0.4V
I
b
1.6
e
e
I
I
Short Circuit
V
Max (BI/RBO)
OS
CC
CC
b
4
mA
mA
Output Current
Supply Current
V
CC
Max
60
103
(Note 2)
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
is measured with all outputs open and all inputs at 4.5V.
CC
A
Note 2: I
CC
2
’46A Switching Characteristics
5V and T
e
e
25 C (See Section 1 for Test Waveforms and Output Load)
at V
§
CC
A
Symbol
Parameter
Conditions
Min
Max
Units
e
e
t
t
Propagation Delay Time
Low to High Level Output
C
15 pF
PLH
L
100
ns
R
120X
L
Propagation Delay Time
High to Low Level Output
PHL
100
ns
Recommended Operating Conditions
DM5447A
DM7447A
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
Nom
Max
V
V
V
V
Supply Voltage
5
5.5
4.75
2
5
5.25
V
V
V
CC
High Level Input Voltage
Low Level Input Voltage
IH
0.8
15
0.8
15
IL
High Level Output
Voltage (a thru g)
OH
V
I
I
I
High Level Output
Current (BI/RBO)
OH
b
b
0.2
0.2
mA
mA
mA
Low Level Output
Current (a thru g)
OL
OL
40
40
Low Level Output
Current (BI/RBO)
8
8
b
T
A
Free Air Operating Temperature
55
125
0
70
C
§
’47A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
e
e b
Min, I
I
b
1.5
V
V
Input Clamp Voltage
V
V
12 mA
V
V
I
CC
High Level Output
Voltage (BI/RBO)
Min
OH
CC
OH
2.4
3.7
0.3
e
I
Max
e
e
Max, V
O
I
High Level Output
Current (a thru g)
V
V
15V
Min
CEX
CC
250
0.4
mA
e
e
Max, V
IH
IL
e
e
Max
V
OL
Low Level Output
Voltage
V
V
Min, I
OL
CC
V
e
e
Min, V
Max
IH
IL
@
Input Current Max
e
e
e
I
V
Max, V
5.5V
I
CC
I
1
mA
mA
mA
Input Voltage
e
e
I
I
High Level Input Current
V
Max, V
Max
2.4V
40
IH
IL
CC
CC
I
b
4
Low Level Input
Current
V
V
BI/RBO
Others
e
0.4V
I
b
1.6
e
I
I
Short Circuit
V
Max (BI/RBO)
OS
CC
CC
b
4
mA
mA
Output Current
e
(Note 2)
Supply Current
V
CC
Max
DM54
DM74
60
60
85
103
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
is measured with all outputs open and all inputs at 4.5V.
CC
A
Note 2: I
CC
3
’47A Switching Characteristics
5V and T
e
e
25 C (See Section 1 for Test Waveforms and Output Load)
at V
§
CC
A
Symbol
Parameter
Conditions
Min
Max
Units
e
e
t
t
Propagation Delay Time
Low to High Level Output
C
15 pF
PLH
PHL
L
100
ns
R
120X
L
Propagation Delay Time
High to Low Level Output
100
ns
Function Table
46A, 47A
Decimal or
Inputs
D
BI/RBO
(Note 1)
Outputs
d
Note
Function
LT
RBI
C
B
A
a
b
c
e
f
g
0
1
H
H
H
X
L
L
L
L
L
L
L
H
H
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
2
3
H
H
X
X
L
L
L
L
H
H
L
H
H
L
L
L
L
H
L
L
L
L
H
H
L
L
H
H
4
5
H
H
X
X
L
L
H
H
L
L
L
H
H
H
L
L
L
L
H
L
H
H
L
L
L
L
H
H
6
7
H
H
X
X
L
L
H
H
H
H
L
H
H
H
L
H
L
L
L
L
L
L
L
H
H
H
H
H
(2)
8
9
H
H
X
X
H
H
L
L
L
L
L
H
H
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
10
11
H
H
X
X
H
H
L
L
H
H
L
H
H
H
H
H
H
H
L
L
L
L
H
H
L
L
H
H
12
13
H
H
X
X
H
H
H
H
L
L
L
H
H
H
L
L
H
H
H
L
H
H
L
L
L
L
H
H
14
15
H
H
X
X
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
L
L
L
H
H
H
H
H
BI
RBI
LT
X
H
L
X
L
X
X
L
X
X
L
X
X
L
X
X
L
X
L
L
H
H
L
H
H
L
H
H
L
H
H
L
H
H
L
H
H
L
H
H
L
(3)
(4)
(5)
H
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 ripple-
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 .
e
e
e
Low level, X Don’t Care
H
High level, L
4
Logic Diagram
TL/F/6518–2
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number DM5447AJ
NS Package Number J16A
5
Physical Dimensions inches (millimeters) (Continued)
16-Lead Molded Dual-In-Line Package (N)
Order Number DM7446AN or DM7447AN
NS Package Number N16E
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into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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