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National Semiconductor Electronic Components Datasheet

DS8880 Datasheet

High Voltage 7-Segment Decoder Driver

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DS8880 pdf
March 1988
DS7880 DS8880 High Voltage 7-Segment Decoder Driver
General Description
The DS7880 DS8880 is custom designed to decode four
lines of BCD and drive a gas-filled seven-segment display
tube
Each output constitutes a switchable adjustable current
sink which provides constant current to the tube segment
even with high tube anode supply tolerance or fluctuation
These current sinks have a voltage compliance from 3V to
at least 80V typically the output current varies 1% for out-
put voltage changes of 3 to 50V Each bit line of the decod-
er switches a current sink on or off as prescribed by the
input code Each current sink is ratioed to the b-output cur-
rent as required for even illumination of all segments
Output currents may be varied over the 0 2 to 1 5 mA range
for driving various tube types or multiplex operation The
output current is adjusted by connecting an external pro-
gram resistor (RP) from VCC to the Program input in accord-
ance with the programming curve The circuit design pro-
vides a one-to-one correlation between program input cur-
rent and b-segment output current
The Blanking Input provides unconditional blanking of any
output display while the Ripple Blanking pins allow simple
leading- or trailing-zero blanking
Features
Y Current sink outputs
Y Adjustable output current 0 2 to 1 5 mA
Y High output breakdown voltage 110V typ
Y Suitable for multiplex operation
Y Blanking and Ripple Blanking provisions
Y Low fan-in and low power
Logic Diagram
C1995 National Semiconductor Corporation TL F 5845
TL F 5845 – 1
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

DS8880 Datasheet

High Voltage 7-Segment Decoder Driver

No Preview Available !

DS8880 pdf
Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
VCC
Input Voltage (Except BI)
7V
6V
Input Voltage (BI)
Segment Output Voltage
VCC
80V
Power Dissipation
600 mW
Maximum Power Dissipation at 25 C
Cavity Package
Molded Package
1509 mW
1476 mW
Derate cavity package 10 06 mW C above 25 C derate molded package
11 81 mW C above 25 C
Transient Segment Output Current
(Note 4)
Storage Temperature Range
Lead Temperature (Soldering 4 sec )
Operating Conditions
Min
Supply Voltage (VCC)
DS7880
DS8880
45
4 75
Temperature (TA)
DS7880
DS8880
b55
0
50 mA
b65 C to a150 C
260 C
Max
55
5 25
a125
a70
Units
V
V
C
C
Electrical Characteristics (Notes 2 and 3)
Symbol
Parameter
Conditions
Min Typ Max Units
VIH
VIL
VOH
VOL
IIH
IIL
Logical ‘‘1’’ Input Voltage
Logical ‘‘0’’ Input Voltage
Logical ‘‘1’’ Output Voltage
Logical ‘‘0’’ Output Voltage
Logical ‘‘1’’ Input Current
Logical ‘‘0’’ Input Current
VCC e Min
VCC e Min
VCC e Min IOUT e b200 mA RBO
VCC e Min IOUT e 8 mA RBO
VCC e Max Except BI
VIN e 2 4V
VIN e 5 5V
VCC e Max VIN e 0 4V
Except BI
BI
20 V
08 V
24 37
V
0 13 0 4
V
2 15 mA
4 400 mA
b300 b600 mA
b1 2 b2 0 mA
ICC Power Supply Current
VCC e Max Rp e 2 2k All Inputs e 0V
27 43 mA
VCD Input Diode Clamp Voltage VCC e Max TA e 25 C IIN e 12 mA
b0 9 b1 5 V
IO
SEGMENT OUTPUTS
All Outputs e 50V
‘‘ON’’ Current Ratio
IOUTb e Ref
Outputs a f and g 0 84
Outut c
1 12
0 93
1 25
1 02
1 38
Output d
0 90 1 00 1 10
Output e
0 99 1 10 1 21
Ib ON
VSAT
ICEX
VBR
tpd
Output b ‘‘ON’’ Current
Output Saturation Voltage
Output Leakage Current
Output Breakdown Voltage
Propagation Delays BCD
Input to Segment Output
VCC e 5V VOUTb e 50V
All Other Outputs t 5V
TA e 25 C
Rp e 18 1k
Rp e 7 03k
Rp e 3 40k
Rp e 2 20k
VCC e Min Rp e 1kg5% IOUTb e 2 mA (Note 5)
VOUT e 75V BI e 0V Rp e 2 2k
IOUT e 250 mA BI e 0V Rp e 2 2k
VCC e 5V TA e 25 C
0 15 0 20
0 45 0 50
0 90 1 00
1 35 1 50
08
0 003
80 110
0 25
0 55
1 10
1 65
25
3
0 4 10
mA
mA
mA
mA
V
mA
V
ms
BI to Segment Output
0 4 10 ms
RBI to Segment Output
0 7 10 ms
RBI to RBO
0 4 10 ms
Note 1 ‘‘Absolute Maximum Rating’’ 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
Note 2 Unless otherwise specified min max limits apply across the b55 C to a125 C temperature range for the DS7880 and across the 0 C to a70 C range for
the DS8880 All typical values are for TA e 25 C and VCC e 5V
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
as max or min or absolute value basis
Note 4 In all applications transient segment output current must be limited to 50 mA This may be accomplished in dc applications by connecting a 2 2k resistor
from the anode-supply filter capacitor to the display anode or by current limiting the anode driver in multiplex applications
Note 5 For saturation mode the segment output currents are externally limited and ratioed
2


Part Number DS8880
Description High Voltage 7-Segment Decoder Driver
Maker National Semiconductor
Total Page 6 Pages
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