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PDF NE587D Data sheet ( Hoja de datos )
| Número de pieza | NE587D | |
| Descripción | LED decoder/driver | |
| Fabricantes | Philipss | |
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Philips Semiconductors Linear Products
LED decoder/driver
Product specification
NE587
DESCRIPTION
The NE587 is a latch/decoder/driver for 7-segment common anode
LED displays. The NE587 has a programmable current output up to
50mA which is essentially independent of output voltage, power
supply voltage, and temperature. The data (BCD) inputs and LE
(latch enable) input are low-loading so that they are compatible with
any data bus system. The 7-segment decoding is implemented with
a ROM so that alternative fonts can be made available.
FEATURES
• Latched BCD inputs
• Low loading bus-compatible inputs
• Ripple-blanking on leading- and/or trailing-edge zeros
APPLICATIONS
• Digital panel motors
• Measuring instruments
• Test equipment
• Digital clocks
• Digital bus monitoring
PIN CONFIGURATIONS
N Package
D1 1
D2 2
LE 3
BI/RBO 4
RBI 5
D3
D0
IP
DIG GND
6
7
8
9
18 VCC
17 f
16 g
15 a
14 b
13 c
12 d
11 e
10 POWER GND
D1 Package
D1 1
D2 2
LE 3
BI/RBO 4
RBI 5
NC 6
D3 7
D0 8
IP 9
DIG GND 10
20 VCC
19 f
18 g
17 a
16 b
15 NC
14 c
13 d
12 e
11 POWER GND
NOTE:
1. SOL and non-standard pinout.
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Small Outline Large (SOL) Package
18-Pin Plastic Dual In-Line Package (DIP)
NOTES:
1. SOL and non-standard pinout
ABSOLUTE MAXIMUM RATINGS
TA=25°C unless otherwise specified.
SYMBOL
PARAMETER
VCC
VIN
VOUT
Supply voltage
Input voltage
(D0-D3, LE, RBI)
Output voltage
(a-g, RBO)
PD Power dissipation (25°C)1
TA Ambient temperature range
TJ Junction temperature
TSTG
Storage temperature range
TSOLD
Soldering temperature (10sec max)
NOTES:
1. Derate power dissipation as indicated
N package—95°C/W above 55°C
TEMPERATURE RANGE
0 to +70°C
0 to +70°C
ORDER CODE
NE587D1
NE587N
DWG #
0172D
0407A
RATING
-0.5 to +7
-0.5 to +15
-0.5 to +7
1000
0 to 70
150
-65 to +150
300
UNIT
V
V
V
mW
°C
°C
°C
°C
August 31, 1994
530 853-1095 13721
1 page  
Philips Semiconductors Linear Products
LED decoder/driver
Product specification
NE587
VCC
1:20
BAND GAP
REFERENCE
PIN 8
IP
RP
IO
VrP 1.3V
IP + RP + RP
Figure 1.
TIMING DIAGRAMS
D0–D3
OUTPUT
tPLH
tPHL
LE = L
Figure 2. tP Data to Output
LE tPLH
tPHL
D0–D3
OUTPUT
Figure 3. tP Latch Enable to Output
a
f gb
ec
d
Segment Identification
An output current of 10 to 50mA was chosen so that it would be
suitable for multiplexed operation of large-size LED digits. When
designing a display system, particular care must be taken to
minimize power dissipation within the IC display driver. Since the
output is a constant-current source, all the remaining supply voltage,
which is not dropped across the LED (and the digit driver, if used),
will appear across the output. Thus, the power dissipation will go up
sharply if the display power supply voltage rises. Clearly, then, it is
good design practice to keep the display supply voltage as low as
possible, consistent with proper operation of the supply output
current sources. Inserting a resistor or diode in series with the
display supply is a good way of reducing the power dissipation
within the integrated circuit segment driver, although, of course, total
system power remains the same.
Power dissipation may be calculated as follows. Referring to Figure
6, the two system power supplies are VCC and VS. In many cases,
these will be the same voltage. Necessary parameters are:
VCC
VS
ICC
ISEG
VF
KDC
Supply voltage to driver
Supply voltage to display
Quiescent supply current of driver
LED segment current
LED segment forward voltage at ISEG
% Duty cycle
VF, the forward LED drop, depends upon the type of LED material
(hence the color) and the forward current. The actual forward
voltage drops should be obtained from the LED display
manufacturer’s literature for the peak segment current selected;
however, approximate voltages at nominal rated currents are:
Red 1.6 to 2.0V
Orange 2.0 to 2.5V
Yellow 2.2 to 3.5V
Green 2.5 to 3.5V
DOL0EU–DTÉÉÉÉP3UT ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉtÉÉÉÉÉÉÉW ÉÉÉÉtS tHÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
Figure 4. Setup and Hold Times
August 31, 1994
534
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NE587D.PDF ] | |
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