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DATA SHEET
MOS INTEGRATED CIRCUIT
Bipolar Analog Integrated Circuit
µPC1555
TIMER CIRCUIT
The µPC1555 is a powerful integrated circuit. Adding a few external parts to it can turn it into various types of
timing signal generators, such as monostable and astable multivibrators. It has trigger, threshold, and control pins.
Inputting a signal to the reset pin can stop the circuit operation easily. In addition, the output can sink current as high
as 200 mA (maximum). So, it can be used to drive relays and lamps.
TYPICAL CHARACTERISTICS
• Supply voltage
: 4.5 to 16 V
• Circuit current (VCC = 5 V) : 3 mA
• Output current capacity : 200 mA
• Temperature stability
: 0.005%/°C
• Rising and falling time : 100 ns
FEATURES
• Monostable and astable oscillation
• Interfacing directly with TTL-level signals
• Variable duty cycle
ORDERING INFORMATION
Part number
Package
µPC1555C 8-pin plastic DIP (300 mil)
µPC1555G2 8-pin plastic SOP (225 mil)
PIN CONFIGURATION (TOP VIEW)
GND 1
8 VCC
Trigger 2 COMP
Flip-flop
Output 3
Output
stage
R 7 Discharge
R
COMP 6 Threshold
R
Reset 4
VREF
5 Control voltage
EQUIVALENT CIRCUIT
8
VCC
R2
1 k
Q6 Q5
Q11
R3
5 k
6
Q1 Q4
Threshold 2 Q2 Q3
5(3VCC)
Control
1
R1
10 k
GND
R4
5 k
Q15 Q16
2
Trigger
Q8 Q9
Q7 Q10
Reset 4
7
Discharge
Q14
Q25
Q12 Q13 R5
5 k
R11
Q22
6.2
k
R6
7.5k
Q21
Q27
R12
3.9
k
Q28
Q17
R7
4.7 k
3
Q24 Output
Q19
Q18
Q20 R10
Q23 120
R8
100
Q26
R9
3.3k
Document No. G10649EJ6V0DS00 (6th edition)
(Previous No. IC-1979)
Date Published November 1995 P
Printed in Japan
©
1986

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µPC1555
ABSOLUTE MAXIMUM RATINGS (TA = 25°C)
Parameter
Supply voltage
Input voltage
(trigger, threshold, reset, control)
Applicable output voltageNote 4
(output and discharge)
Output current
Power dissipation
Operating temperature
Storage temperature
Symbol
VCC
VIN
VO
IO
PT
TA
Tstg
Rated value
µPC1555C
µPC1555G
–0.3 to +18
–0.3 to +18
–0.3 to VCC + 0.3
–0.3 to VCC + 0.3
–0.3 to VCC + 0.3
–0.3 to VCC + 0.3
200Note 1
600Note 2
–20 to +80
–55 to +125
200Note 1
440Note 3
–20 to +80
–55 to +125
Unit
V
V
V
mA
mW
°C
°C
Notes 1. Be sure to use the product within the Power dissipation.
2. For TA 25°C, the total loss is derated at TJ MAX = 125°C and –6 mW/°C.
(See the PT-TA characteristic curve.)
3. For TA 25°C, the total loss is derated at TJ MAX = 125°C and –4.4 mW/°C.
(See the PT-TA characteristic curve.)
4. This is an external voltage that can be applied to the output pin without deteriorating the quality of the
product or causing damage to the product.
Be sure to use the product within the rated value under any conditions where coils are inserted or power
is turned on or off. The output voltage that can be obtained during normal operation is within the output
saturation voltage range.
RECOMMENDED OPERATING CONDITIONS (TA = 25°C)
Parameter
Supply voltage
Oscillation frequency
Output pulse width
Input voltage (trigger, threshold)
Input voltageNote 5 (control)
Reset voltage (high level)
Reset voltage (low level)
Symbol
VCC
f
tW (OUT)
VIN
VIN
Vreset H
Vreset L
Conditions
VCC = 5 to 15 V
VCC = 5 to 15 V
VCC = 5 to 15 V
VCC = 5 to 15 V
MIN.
4.5
0.1
10 µ
0
3.0
1.0
0
MAX.
16
100 k
10
VCC
VCC • 1.5
VCC
0.4
Unit
V
Hz
Sec
V
V
V
V
Note 5.
This parameter defines the voltage that can be applied when a PWM mode application circuit is
configured by applying an external voltage to the control pin. Usually, a capacitance of 0.01 µF is
connected as shown in the application circuit.
2

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µPC1555
ELECTRICAL CHARACTERISTICS (TA = 25°C, VCC = 5 to 15 V)
Parameter
Supply voltage
Supply current
Threshold voltage
Threshold current
Trigger voltage
Trigger current
Reset voltage
Reset current
Control voltage
Output saturation voltage “L”
Output saturation voltage “H”
Propagation delay (L H)
Propagation delay (H L)
Minimum trigger pulse width
Minimum output pulse width
Minimum reset pulse width
Timing error
Initial accuracy
Temperature drift
Supply voltage drift
Symbol
VCC
ICC
Vth
Ith
Vtr
Itr
Vreset
Ireset
Vcont
VOL
VOH
tPLH
tPHL
tW (tr)
tW (OUT)
tw (reset)
Conditions
VCC = 5 V, RL = , VO = “L”Note 6
VCC = 15 V, RL = , VO = “L”Note 6
MIN.
4.5
0
0
Note 7
VCC = 15 V
VCC = 5 V
0
Note 8
0.4
VCC = 15 V
VCC = 5 V
VCC = 15 V, ISINK = 10 mA
VCC = 15 V, ISINK = 50 mA
VCC = 15 V, ISINK = 100 mA
VCC = 15 V, ISINK = 200 mA
VCC = 5 V, ISINK = 5 mA
VCC = 15 V, ISOURCE = 200 mA
VCC = 15 V, ISOURCE = 100 mA
VCC = 5 V, ISOURCE = 100 mA
9.0
2.6
0
0
0
0
12.75
2.75
VCC = 15 V, Vtr min. = 2.5 V
VCC = 15 V, Vtr min. = 2.5 V
tW (tr) = 3 µs
VCC = 15 V, Vtr min. = 0 V
Astable multivibrator
RA, RB = 1 to 100 k
C = 0.1 µF
TYP.
3
10
2/3 VCC
0.1
5
1.67
0.5
0.7
0.1
10
3.33
0.1
0.4
2.0
2.5
0.1
12.5
13.3
3.3
200
200
25
6
900
1
50
0.01
MAX.
16
6
15
0.25
1.0
11
4
0.25
0.75
2.5
0.35
15.0
5.0
Unit
V
mA
mA
V
µA
V
V
µA
V
mA
V
V
V
V
V
V
V
V
V
V
ns
ns
ns
µs
ns
%
ppm/°C
%/V
Notes 6. When the output is “H”, the circuit current decreases by approximately 1 mA (when VCC = 5 V).
7. The maximum allowable value for RA + RB is determined for a supply voltage of 15 V. The maximum
value is 20 M.
8. When the reset pin is driven to a low level, discharge TrQ14 is turned on, stopping oscillation (the output
state is undefined).
3

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CHARACTERISTIC CURVES (TA = 25°C, TYP.)
Minimum trigger pulse width characteristic
1.2
VCC = 15 V
1.0
0.8
0.6
TJ = 125°C
0.4
TI = 25°C
0.2
0123456
Minimum trigger pulse voltage Vtr min. (V)
ISOURCE-(VCC-VOUT) characteristic
2
–20°C
1 70°C TA = 25°C
0
1
3 5 10
30 50 100
Output source current ISOURCE (mA)
ISINK-VOUT characteristic
10
VCC = 10 V
–20°C
1
25°C
70°C
TA = 25°C
0.1 70°C–20°C
0.01
1.0
3.0 5.0 10
30 50 100
Output sink current ISINK (mA)
4
µPC1555
ICC-VCC characteristic
12
10
–20°C
8
TA = 25°C
6
70°C
4
2
0
5 10 15
Supply voltage VCC (V)
ISINK-VOUT characteristic
10
VCC = 5 V
1
0.1
0.01
1.0
3.0 5.0 10
30 50 100
Output sink current ISINK (mA)
ISINK-VOUT characteristic
10
VCC = 10 V
1 –20°C
TA = 25°C
0.1
70°C
–20°C
0.01
1.0
3.0 5.0 10
30 50 100
Output sink current ISINK (mA)

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Propagation delay characteristic
1.2
TA = 25°C
1.0
0.8
VCC = 5 V
0.6
0.4
VCC = 10 V,15 V
0.2
0
0.1 0.2 0.3
Minimum trigger pulse voltage (×VCC)
PT-TA characteristic
700
600 C
500
G
400
300
200
100
10
20 40 60 80 100
Ambient temperature TA (°C)
vtW-ttr min. characteristic
7
VCC = 15 V
tW(tr) = 5 sµ
6
5
4
3
2
1
0
12345
Minimum trigger pulse voltage Vtr min. (V)
µPC1555
Discharge pin ISINK-VSAT characteristic
1000
VCC = 5 V
100 TA = 70°C
10 25°C
–20°C
1.0
0.01 0.1 1 10 100
Discharge pin (pin 7) sink current ISINK (mA)
vtW-tW (tr) characteristic
5
VCC = 15 V
Vtr min = 2.5 V
4
3
2
1
0
2 4 6 8 10
Trigger pulse width tW (tr) (µs)
5