DATA SHEET
MOS INTEGRATED CIRCUIT
Bipolar Analog Integrated Circuit
µ
PC1555
TIMER CIRCUIT
The
µ
PC1555 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
• Output current capacity
• Temperature stability
• Rising and falling time
: 4.5 to 16 V
: 200 mA
: 0.005%/°C
: 100 ns
• Circuit current (V
CC
= 5 V) : 3 mA
FEATURES
• Monostable and astable oscillation
• Interfacing directly with TTL-level signals
• Variable duty cycle
ORDERING INFORMATION
Part number
Package
8-pin plastic DIP (300 mil)
PIN CONFIGURATION (TOP VIEW)
µ
PC1555C
GND 1
8 V
CC
µ
PC1555G2 8-pin plastic SOP (225 mil)
Trigger 2
COMP
Flip-flop
R
R
COMP
7 Discharge
Output 3
Output
stage
6 Threshold
R
5 Control voltage
V
REF
Reset 4
EQUIVALENT CIRCUIT
8
V
CC
Q
6
Q
5
Q
11
R
2
1 k
Ω
R
3
5 k
Ω
Q
22
6.2
k
Ω
R
11
6
Threshold 2
Q
2
Q
3
5 (3V
CC
)
Control
1
GND
2
Trigger
Reset
7
Discharge
4
Q
25
Q
1
Q
4
Q
21
R
4
R
6
7.5k
Ω
Q
27
Q
28
R
12
3.9
k
Ω
3
R
1
10 k
Ω
5 k
Ω
Q
15
Q
8
Q
9
Q
16
Q
17
R
7
4.7 k
Ω
Q
19
Q
18
Q
20
Q
24
Output
Q
7
Q
12
Q
10
R
5
Q
23
120
R
10
R
9
3.3k
Ω
Q
26
Q
13
5 k
Ω
R
8
100
Ω
Q
14
Document No. G10649EJ6V0DS00 (6th edition)
(Previous No. IC-1979)
Date Published November 1995 P
Printed in Japan
©
1986
µ
PC1555
ABSOLUTE MAXIMUM RATINGS
(T
A
= 25°C)
Rated value
Parameter
Supply voltage
Input voltage
(trigger, threshold, reset, control)
Applicable output voltage
Note 4
(output and discharge)
Output current
Power dissipation
Operating temperature
Storage temperature
I
O
P
T
T
A
T
stg
200
Note 1
600
Note 2
–20 to +80
–55 to +125
200
Note 1
440
Note 3
–20 to +80
–55 to +125
mA
mW
°C
°C
Symbol
V
CC
V
IN
µ
PC1555C
–0.3 to +18
–0.3 to V
CC
+ 0.3
µ
PC1555G
–0.3 to +18
–0.3 to V
CC
+ 0.3
Unit
V
V
V
O
–0.3 to V
CC
+ 0.3
–0.3 to V
CC
+ 0.3
V
Notes 1.
Be sure to use the product within the Power dissipation.
2.
For T
A
≥
25°C, the total loss is derated at T
J
(See the P
T
-T
A
characteristic curve.)
3.
For T
A
≥
25°C, the total loss is derated at T
J
(See the P
T
-T
A
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
(T
A
= 25°C)
Parameter
Supply voltage
Oscillation frequency
Output pulse width
Input voltage (trigger, threshold)
Input voltage
Note 5
(control)
Reset voltage (high level)
Reset voltage (low level)
Symbol
V
CC
f
t
W (OUT)
V
IN
V
IN
V
reset H
V
reset L
V
CC
= 5 to 15 V
V
CC
= 5 to 15 V
V
CC
= 5 to 15 V
V
CC
= 5 to 15 V
Conditions
MIN.
4.5
0.1
10
µ
0
3.0
1.0
0
MAX.
16
100 k
10
V
CC
V
CC •
1.5
V
CC
0.4
Unit
V
Hz
Sec
V
V
V
V
MAX
MAX
= 125°C and –6 mW/°C.
= 125°C and –4.4 mW/°C.
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
µ
F is
connected as shown in the application circuit.
2
µ
PC1555
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C, V
CC
= 5 to 15 V)
Parameter
Supply voltage
Supply current
Symbol
V
CC
I
CC
V
CC
= 5 V, R
L
=
∞,
V
O
= “L”
Note 6
V
CC
= 15 V, R
L
=
∞,
V
O
= “L”
Note 6
Threshold voltage
Threshold current
Trigger voltage
V
th
I
th
V
tr
Note 7
Conditions
MIN.
4.5
0
0
TYP.
MAX.
16
Unit
V
mA
mA
V
3
10
2/3 V
CC
6
15
0
0.1
5
1.67
0.5
0.25
µ
A
V
V
V
CC
= 15 V
V
CC
= 5 V
Trigger current
Reset voltage
Reset current
Control voltage
I
tr
V
reset
I
reset
V
cont
V
CC
= 15 V
V
CC
= 5 V
9.0
2.6
0
0
0
Note 8
µ
A
1.0
V
mA
11
4
0.25
0.75
2.5
V
V
V
V
V
V
0.35
V
V
15.0
5.0
V
V
ns
ns
ns
0.4
0.7
0.1
10
3.33
0.1
0.4
2.0
2.5
Output saturation voltage “L”
V
OL
V
CC
= 15 V, I
SINK
= 10 mA
V
CC
= 15 V, I
SINK
= 50 mA
V
CC
= 15 V, I
SINK
= 100 mA
V
CC
= 15 V, I
SINK
= 200 mA
V
CC
= 5 V, I
SINK
= 5 mA
0
0.1
12.5
Output saturation voltage “H”
V
OH
V
CC
= 15 V, I
SOURCE
= 200 mA
V
CC
= 15 V, I
SOURCE
= 100 mA
V
CC
= 5 V, I
SOURCE
= 100 mA
12.75
2.75
13.3
3.3
200
200
Propagation delay (L
→
H)
Propagation delay (H
→
L)
Minimum trigger pulse width
Minimum output pulse width
t
PLH
t
PHL
t
W (tr)
t
W (OUT)
V
CC
= 15 V, V
tr min.
= 2.5 V
V
CC
= 15 V, V
tr min.
= 2.5 V
t
W (tr)
= 3
µ
s
V
CC
= 15 V, V
tr min.
= 0 V
Astable multivibrator
R
A
, R
B
= 1 to 100 kΩ
C = 0.1
µ
F
25
6
900
µ
s
ns
Minimum reset pulse width
Timing error
Initial accuracy
Temperature drift
Supply voltage drift
t
w (reset)
1
50
0.01
%
ppm/°C
%/V
Notes 6.
When the output is “H”, the circuit current decreases by approximately 1 mA (when V
CC
= 5 V).
7.
The maximum allowable value for R
A
+ R
B
is determined for a supply voltage of 15 V. The maximum
value is 20 MΩ.
8.
When the reset pin is driven to a low level, discharge T
r
Q
14
is turned on, stopping oscillation (the output
state is undefined).
3
µ
PC1555
CHARACTERISTIC CURVES
(T
A
= 25°C, TYP.)
Minimum trigger pulse width characteristic
Minimum trigger pulse width t
W (tr)
(
µ
s)
I
CC
-V
CC
characteristic
12
1.2
V
CC
= 15 V
1.0
0.8
0.6
T
J
= 125°C
0.4
T
I
= 25°C
0.2
Circuit current I
CC
(mA)
10
8
–20°C
T
A
= 25°C
6
70°C
4
2
0
5
0
1
2
3
4
5
6
10
Supply voltage V
CC
(V)
15
Minimum trigger pulse voltage V
tr min.
(V)
I
SOURCE
-(V
CC
-V
OUT
) characteristic
Output saturation voltage V
CC
-V
OUT
(V)
2
–20°C
10
I
SINK
-V
OUT
characteristic
Output saturation voltage V
OUT
(V)
V
CC
= 5 V
1
25
°
C
20
°
C
3.0 5.0
1
0.1
0
1
3
5
10
30 50 100
0.01
1.0
T
A
= –
70°C T
A
= 25°C
10
70
°
C
30 50 100
Output source current I
SOURCE
(mA)
Output sink current I
SINK
(mA)
I
SINK
-V
OUT
characteristic
10
Output saturation voltage V
OUT
(V)
I
SINK
-V
OUT
characteristic
10
Output saturation voltage V
OUT
(V)
V
CC
= 10 V
–20°C
1
25°C
70°C
V
CC
= 10 V
–20°C
1
T
A
= 25°C
0.1
70
°
C
–20
°
C
T
A
= 25°C
0.1
C
70
°
°
C
–20
0.01
1.0
3.0 5.0
10
30 50 100
0.01
1.0
3.0 5.0
10
30 50 100
Output sink current I
SINK
(mA)
Output sink current I
SINK
(mA)
4
µ
PC1555
Propagation delay characteristic
Discharge pin saturation voltage V
SAT
(mV)
1.2
T
A
=
25°C
Propagation delay (
µ
s)
Discharge pin I
SINK
-V
SAT
characteristic
1000
V
CC
=
5 V
1.0
0.8
0.6
0.4
0.2
0
V
CC
=
10 V,15 V
V
CC
=
5 V
100
T
A
=
70°C
10
25°C
–20°C
0.1
0.2
0.3
1.0
0.01
0.1
1
10
100
Minimum trigger pulse voltage (×V
CC
)
Discharge pin (pin 7) sink current I
SINK
(mA)
P
T
-T
A
characteristic
700
v
t
W
-t
W (tr)
characteristic
5
Minimum output pulse width -
trigger pulse width
vt
W
(
µ
s)
600
C
V
CC
= 15 V
V
tr min
= 2.5 V
4
3
2
1
0
Total loss P
T
(mW)
500
G
400
300
200
100
10
20
40
60
80
100
2
4
6
8
10
Ambient temperature T
A
(°C)
Trigger pulse width t
W (tr)
(
µ
s)
v
t
W
-t
tr min.
characteristic
7
6
V
CC
= 15 V
t
W(tr)
= 5 s
µ
Minimum output pulse width -
trigger pulse width
vt
W
(
µ
s)
5
4
3
2
1
0
1
2
3
4
5
Minimum trigger pulse voltage V
tr min.
(V)
5
Microcontroller MCU
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