UPC1555C Renesas Electronics America, UPC1555C Datasheet - Page 9

• Manufacturer Part Number: UPC1555C
• Manufacturer: Renesas Electronics America

Specifications of UPC1555C

• Lead Free Status / Rohs Status: Not Compliant

APPLICATION CIRCUITS
(1) Monostable multivibrator
Fig. a, it functions as a monostable multivibrator.
Applying a voltage one-third as high as V
(trigger pulse
output to a high level. Under this condition, capacitor
C
charged up to two-thirds as high as V
pin) is turned on and inverted to a low level. At this point,
C
pulse is applied to pin 2 again, the same operation is
repeated. Fig. b shows this operation. A capacitor
connected to pin 5 functions as a nose filter for the
control voltage. If pin 4 (reset pin) is connected to 1 V
or higher (for example, by being connected to V
circuit operation can be stopped by switching it from 2
V or higher to a GND level.
retically by (see Fig. c):
output pulse width, determine R
as required. Moreover, R
1
1
When the
The output pulse width (delay) is determined theo-
The value obtained by this equation is only an approximate value, however. If it is necessary to obtain an accurate
The application circuits and their parameters are for references only and are not intended for use in actual
design-in's.
starts charging through resistor R
starts discharging through pin 7. When a trigger
Fig. a Monostable Multivibrator Example
Notes 9. Keep the trigger pulse width smaller than the output pulse width.
Note 10
V
R
CC
L
= 5 to 15 V
TRIGGER
10. If the load is connected across the output and GND pins, a “staircase” occurs in the output waveform.
OUTPUT
Note 9
PC1555 is configured as shown in
) to pin 2 (trigger pin) drives the
t = 1.1
2
3
4
PC1555
1
•
1
C
should be 300
1
•
8
R
1
1
and C
7
6
5
CC
, pin 6 (threshold
1
. When C
1
through actual measurement and confirmation; a trimmer should be used
Control voltage
CC
0.01 F
or higher.
R
CC
C
or less
1
1
), the
1
is
Fig. b Monostable Response Waveform
Fig. c Interrelationships among Output
Trigger input voltage: 5 V/DIV
Output voltage: 5 V/DIV
Capacitor (C
(R
0.001
0.01
1
100
1.0
0.1
10
= 9.1 k , C
10
Pulse Width, R
mate value obtained by calculation)
"L"
s
(R
t = 1.1 C
1
1
) voltage: 2 V/DIV
)
100
t = 0.1 ms/DIV
1
s
Output pulse width t
= 0.01 F, R
1
R
1.0
"H"
ms
1
1
, and C
10
ms
L
"L"
= 1 k )
100
ms
1
(approxi-
PC1555
1.0
"H"
s
10
s
7