DS8973 [NSC]
DS8973 9-Digit LED Driver; DS8973 9位数字LED驱动器
| 型号： | DS8973 |
| 厂家： | 
National Semiconductor |
| 描述： | DS8973 9-Digit LED Driver |
| 文件： | 总4页 (文件大小：86K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 1986
DS8973 9-Digit LED Driver
General Description
The DS8973 is a 9-digit driver designed to operate from
3-cell battery supplies. Each driver will sink 100 mA to less
than 0.7V when driven by only 0.1 mA. Each input is blocked
by diodes so that the input can be driven below ground with
virtually no current drain. This is especially important in cal-
culator systems employing a DC-to-DC converter on the
negative side of the battery. If the converter were on the
positive side of the battery, the converter would have to
handle all of the display current, as well as the MOS calcula-
tor chip current. But if it is on the negative side, it only has
to handle the MOS current. The DS8973 is designed for the
more efficient operating mode.
Features
Y
Nine complete digit drivers
Y
Built-in low battery indicator
Y
High current outputsÐ100 mA
Y
Straight through pin out for easy board layout
Equivalent Circuit Diagrams
Typical Driver Circuit
Typical D.P. Out Circuit
TL/F/5851–2
TL/F/5851–1
Connection Diagram
Dual-In-Line Package
TL/F/5851–3
Top View
Order Number DS8973N
See NS Package Number N22A
C
1995 National Semiconductor Corporation
TL/F/5851
RRD-B30M105/Printed in U. S. A.
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Operating Conditions
Min
Max
5.5
Units
Supply Voltage (V )
B
3.0
3.0
0
V
V
Supply Voltage (V
)
9.5
CC1
Supply Voltage
10V
10V
10V
a
Temperature (T )
A
70
C
§
Input Voltage
Output Voltage
b
a
65 C to 150 C
Storage Temperature Range
§
§
Maximum Power Dissipation* at 25 C
Molded Package
§
1673 mW
Lead Temperature (Soldering, 4 seconds)
260 C
§
*Derate molded package 13.39 mW/ C above 25 C.
§
§
Electrical Characteristics
Symbol
Parameter
Conditions
Min
3.9
0.1
Typ
Max
Units
V
e
V
IH
Logical ‘‘1’’ Input Voltage
Logical ‘‘1’’ Input Current
Logical ‘‘0’’ Input Voltage
Logical ‘‘0’’ Input Current
High Battery Threshold
V
V
V
V
Max
CC
CC
CC
CC
OT
e
e
e
I
Max, V
Max
3.9V
0.5V
0.3
0.5
40
mA
V
IH
IH
e
V
IL
e
I
Max, V
mA
IL
IL
s
e
25 C, V (Pin 2)
b
50 mA,
V
BH
V
T
(Pin 1)
1V, I
DS8973
DS8973
OT
3.6
V
V
e
e
3.9V
§
A
IH
s
e
b
V
BL
Low Battery Threshold
V
(Pin 1)
OT
e
2.1V, I
6 mA,
e
3.9V
OT
3.2
T
25 C, V (Pin 2)
IH
§
A
e
e
e
e
e
e
I
Logical ‘‘1’’ Output Current
Logical ‘‘0’’ Output Voltage
Supply Current
V
CC
V
CC
V
CC
V
CC
Min, V
OH
9.5V, V
IL
0.5V
50
0.7
6
mA
V
CEX
e
e
3.9V
V
Min, I
OL
100 mA, V
OL
CC1
B
IH
I
I
Max, One Input ‘‘ON’’
mA
mA
e
Pin 21 (High Battery Supply)
Max, V
Max
1.2
B
Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation.
a
Note 2: Unless otherwise specified, min/max limits apply across the 0 C to 70 C range. All typicals are given for T
e
25 C.
§
§
§
Note 3: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown
A
as max or min on absolute value basis.
2
3
Physical Dimensions inches (millimeters)
Molded Dual-In-Line Package (N)
Order Number DS8973N
NS Package Number N22A
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