NE587 Philipss, NE587 Datasheet - Page 6

• Manufacturer Part Number: NE587
• Description: LED decoder/driver
• Manufacturer: Philipss

Philips Semiconductors Linear Products
TYPICAL PERFORMANCE CURVES
These voltages are all for single-diode displays. Some early red
displays had 2 series LEDs per segment; hence the forward voltage
drop was around 3.5V.
Thus, a maximum power dissipation calculation when all segments
are on, is:
Assuming V
P
However, the average power dissipation will be considerably less
than this. Assuming 5 segments are on (the average for all output
code combinations), then
P
Operating temperature range limitations can be deduced from the
power dissipation graph. (See Typical Performance Characteristics.)
August 31, 1994
D MAX
D MAX
(mA)
P
I
CC
LED decoder/driver
I
(%)
OUT
D
Normalized Output Current vs Supply
Supply Current vs Supply Voltage
105
102
100
40.0
35.0
30.0
25.0
20.0
98
95
x K
= 5.25
= 5.0
4.0
4.0
V
Voltage V
CC
DC
V
K
S
F
DC
4.4
mW
x I
= 2.0V
4.5
= V
30 + 3.00
= 100%
50 + 3.25
(25 C)
CC
CC
4.8
O
V
= 5.25V
= 2V, T
5.0
(0 C)
V
CC
CC
(V
5.2
ALL OUTPUTS “ON”
(VOLTS)
S
(70 C)
(VOLTS)
R
5
5.5
NE587
P
7
A
5.6
= 1k
= 25 C
25mW = 525mW
30mW = 945mW
V
R
V
F
OUT
P
6.0
6.0
) x 7 x I
= 1k
= 2V
6.4
SEG
(mW)
P
I
(mA)
OUT
D
1000
Output Current vs Output Voltage
40.0
30.0
20.0
10.0
800
600
400
200
Maximum Power Dissipation vs
0
0
0
(25 C)
1.0
Temperature
2.0
R
25
(0 C)
(70 C)
V
P
535
OUT
3.0
T
= 1k
A
( C)
(VOLTS)
4.0
NOTE:
Decoupling capacitor on V
5.0
D
D
D
D
LE
I
RBI
50
P
3
2
1
0
75
Figure 5. Driving a Single Digit
I
(%)
I
(mA)
CC
OUT
OUT
NE587
Output Current vs Program Resistor
110.0
105.0
100.0
should be 0.01 F ceramic.
95.0
90.0
50.0
40.0
30.0
20.0
10.0
V
0.0
Normalized Output Current vs
CC
0
Temperature V
a
b
c
d
e
f
g
0.01 F
10 20 30 40 50 60 70 80
2.0
4.0
TEMP ( C)
RBO
R
R
P
NE587
CC
P
Product specification
= 1k
(k )
V
V
T
6.0
= 5.0V
A
CC
OUT
= (25 C)
NE587
= 5.0V
= 2V
8.0
V
S
10.0