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DATA SHEET
MOS INTEGRATED CIRCUIT Bipolar Analog Integrated Circuit
PC1555
TIMER CIRCUIT
The 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 (VCC = 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)
PC1555C
GND 1
8 VCC
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 VREF
Reset 4
EQUIVALENT CIRCUIT
8 VCC
Q6 Q5 Q11
R2 1 k R3 5 k
Q22 6.2
R11
k
Q27 Q28
6
Threshold 2 Q2 Q3 5 (3VCC) Control 1 GND 2 Trigger Reset 7 Discharge 4
Q25
Q1
Q4 Q21 R4
R6 7.5k
R12 3.9 k 3
R1 10 k
5 k
Q15 Q8 Q9 Q16
Q17
R7 4.7 k
Q19 Q18 Q20
Q24
Output
Q7 Q12
Q10 R5
Q23 120
R10 R9 3.3k
Q26
Q13
5 k
R8 100
Q14
Document No. G10649EJ6V0DS00 (6th edition) (Previous No. IC-1979) Date Published November 1995 P Printed in Japan
(c)
1986
PC1555
ABSOLUTE MAXIMUM RATINGS (TA = 25C)
Rated value Parameter Supply voltage Input voltage (trigger, threshold, reset, control) Applicable output voltageNote 4 (output and discharge) Output current Power dissipation Operating temperature Storage temperature IO PT TA Tstg 200Note 1 600Note 2 -20 to +80 -55 to +125 200Note 1 440Note 3 -20 to +80 -55 to +125 mA mW C C Symbol VCC VIN
PC1555C
-0.3 to +18 -0.3 to VCC + 0.3
PC1555G
-0.3 to +18 -0.3 to VCC + 0.3
Unit V V
VO
-0.3 to VCC + 0.3
-0.3 to VCC + 0.3
V
Notes 1. Be sure to use the product within the Power dissipation. 2. For TA 25C, the total loss is derated at TJ (See the PT-TA characteristic curve.) 3. For TA 25C, the total loss is derated at TJ (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 = 25C)
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 VCC = 5 to 15 V VCC = 5 to 15 V VCC = 5 to 15 V VCC = 5 to 15 V Conditions MIN. 4.5 0.1 10 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
MAX MAX
= 125C and -6 mW/C. = 125C 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 F is connected as shown in the application circuit.
2
PC1555
ELECTRICAL CHARACTERISTICS (TA = 25C, VCC = 5 to 15 V)
Parameter Supply voltage Supply current Symbol VCC ICC VCC = 5 V, RL = , VO = "L"Note 6 VCC = 15 V, RL = , VO = "L"Note 6 Threshold voltage Threshold current Trigger voltage Vth Ith Vtr
Note 7
Conditions
MIN. 4.5 0 0
TYP.
MAX. 16
Unit V mA mA V
3 10 2/3 VCC
6 15
0
0.1 5 1.67 0.5
0.25
A
V V
VCC = 15 V VCC = 5 V
Trigger current Reset voltage Reset current Control voltage
Itr Vreset Ireset Vcont VCC = 15 V VCC = 5 V 9.0 2.6 0 0 0
Note 8
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"
VOL
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
0
0.1 12.5
Output saturation voltage "H"
VOH
VCC = 15 V, ISOURCE = 200 mA VCC = 15 V, ISOURCE = 100 mA VCC = 5 V, ISOURCE = 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
tPLH tPHL tW (tr) tW (OUT) VCC = 15 V, Vtr min. = 2.5 V VCC = 15 V, Vtr min. = 2.5 V tW (tr) = 3 s VCC = 15 V, Vtr min. = 0 V Astable multivibrator RA, RB = 1 to 100 k C = 0.1 F
25 6 900
s
ns
Minimum reset pulse width Timing error Initial accuracy Temperature drift Supply voltage drift
tw (reset)
1 50 0.01
% 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
PC1555
CHARACTERISTIC CURVES (TA = 25C, TYP.) Minimum trigger pulse width characteristic
Minimum trigger pulse width tW (tr) (s)
ICC-VCC characteristic
12
1.2 VCC = 15 V 1.0 0.8 0.6 TJ = 125C 0.4 TI = 25C 0.2 Circuit current ICC (mA)
10 8
-20C
TA = 25C 6 70C 4 2 0 5
0
1
2
3
4
5
6
10 Supply voltage VCC (V)
15
Minimum trigger pulse voltage Vtr min. (V)
ISOURCE-(VCC-VOUT) characteristic
Output saturation voltage VCC-VOUT (V) 2 -20C
10
ISINK-VOUT characteristic
Output saturation voltage VOUT (V)
VCC = 5 V
1
25C
20C
3.0 5.0
1
0.1
0
1
3
5
10
30 50 100
0.01 1.0
TA = -
70C TA = 25C
10
70C
30 50 100
Output source current ISOURCE (mA)
Output sink current ISINK (mA)
ISINK-VOUT characteristic
10
Output saturation voltage VOUT (V)
ISINK-VOUT characteristic
10
Output saturation voltage VOUT (V)
VCC = 10 V -20C 1 25C 70C
VCC = 10 V -20C
1 TA = 25C 0.1
70 C -20 C
TA = 25C 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 ISINK (mA)
Output sink current ISINK (mA)
4
PC1555
Propagation delay characteristic
Discharge pin saturation voltage VSAT (mV) 1.2 TA = 25C
Propagation delay (s)
Discharge pin ISINK-VSAT characteristic
1000 VCC = 5 V
1.0 0.8 0.6 0.4 0.2 0 VCC = 10 V,15 V VCC = 5 V
100
TA = 70C
10
25C -20C
0.1
0.2
0.3
1.0 0.01
0.1
1
10
100
Minimum trigger pulse voltage (xVCC)
Discharge pin (pin 7) sink current ISINK (mA)
PT-TA characteristic
700
v tW-tW (tr) characteristic
5
Minimum output pulse width trigger pulse width vtW ( s)
600
C
VCC = 15 V Vtr min = 2.5 V 4 3 2 1 0
Total loss PT (mW)
500 G 400 300 200 100 10 20 40 60 80 100
2
4
6
8
10
Ambient temperature TA (C)
Trigger pulse width tW (tr) ( s)
v tW-ttr min. characteristic
7 6 VCC = 15 V tW(tr) = 5 s
Minimum output pulse width trigger pulse width vtW ( s)
5 4 3 2 1 0 1 2 3 4 5
Minimum trigger pulse voltage Vtr min. (V)
5
PC1555
PIN FUNCTIONS 1. Trigger pin (pin 2) 2. Output pin (pin 3) 3. Reset pin (pin 4) : Supplying one-third of VCC to the trigger pin triggers the circuit, changing the output voltage from low to high. : The maximum output current is 200 mA. Be careful not to exceed the total loss (see the PT-TA characteristic curve). : Supplying 0.4 V or less to the reset pin stops the circuit operation (such as monostable or astable multivibrator operation). When not used, the reset pin should be clamped at 1 V to VCC. 4. Control voltage (pin 5) : This voltage determines the threshold level of the comparator. It is set to two-thirds of VCC. It is possible to configure a PWM (pulse width modulation) or PPM (pulse position modulation) mode application circuit by supplying a control voltage from the outside. When this pin is not in use, it should be bypassed using a capacitor of approximately 0.01 F for more table circuit operation. 5. Threshold pin (pin 6) 6. Discharge pin (pin 7) : The values of an external capacitor (C) and resistor (R) connected to this pin determine the width of the output pulse. : This pin is used to discharge an external capacitor (if connected). It operates, when the internal flip-flop circuit is turned on, or a reset signal is applied.
6
PC1555
APPLICATION CIRCUITS (1) Monostable multivibrator Fig. a Monostable Multivibrator Example
VCC = 5 to 15 V
Note 10
Fig. b Monostable Response Waveform
t = 0.1 ms/DIV Trigger input voltage: 5 V/DIV
RL TRIGGER 2 4 8 7
R1
Output voltage: 5 V/DIV "H"
"H"
PC1555
3 OUTPUT 1
6 5
C1
"L" "L"
Capacitor (C1) voltage: 2 V/DIV
Control voltage 0.01 F
When the PC1555 is configured as shown in Fig. a, it functions as a monostable multivibrator. Applying a voltage one-third as high as VCC or less (trigger pulseNote 9) to pin 2 (trigger pin) drives the output to a high level. Under this condition, capacitor C1 starts charging through resistor R1. When C1 is charged up to two-thirds as high as VCC, pin 6 (threshold
Capacitor C1 capacitance (F)
(R1 = 9.1 k, C1 = 0.01 F, RL = 1 k)
Fig. c Interrelationships among Output Pulse Width, R1, and C1 (approximate value obtained by calculation)
100 t = 1.1 C1 R1 10 1.0 0.1 0.01 0.001 10 s (R1)
pin) is turned on and inverted to a low level. At this point, C1 starts discharging through pin 7. When a trigger 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 VCC), the circuit operation can be stopped by switching it from 2 V or higher to a GND level. The output pulse width (delay) is determined theoretically by (see Fig. c):
t = 1.1 * C1 * R1
k
k
k
M 1
0
10
0
100 1.0 s ms
10 100 1.0 ms ms s
10
10
10 s
1.
Output pulse width t
The value obtained by this equation is only an approximate value, however. If it is necessary to obtain an accurate output pulse width, determine R1 and C1 through actual measurement and confirmation; a trimmer should be used as required. Moreover, R1 should be 300 or higher. Notes 9. Keep the trigger pulse width smaller than the output pulse width. 10. If the load is connected across the output and GND pins, a "staircase" occurs in the output waveform.
The application circuits and their parameters are for references only and are not intended for use in actual design-in's.
M
7
PC1555
(2) Astable multivibrator example Fig. d Astable Multivibrator Example
VCC = 5 to 15 V
Note 10
Fig. e Astable Multivibrator Response Waveform
t = 0.5 ms/DIV Output voltage: 5 V/DIV
RL 4 3 OUTPUT 5 1 Control voltage 0.01 F 2
PC1555
R1 8 7 R2 6 C1
"H"
"H" "L"
"H" "L"
Capacitor (C1) voltage: 1.7 V/DIV
(R1 = R2 = 4.8 k, C1 = 0.1 F, RL = 1 k)
When the PC1555 is used in a circuit configuration shown in Fig. d, the circuit is triggered by itself to operate as an astable multivibrator, because pin 2 (trigger pin) and pin 6 (threshold pin) are connected to each other. When the output voltage is high, capacitor C1 is charged through R1 and R2. When C1 is charged
Capacitor C1 capacitance ( F)
Fig. f Interrelationships among Oscillation Frequency, R1, R2, and C1 (approximate value obtained by calculation)
100 10
up to a voltage two-thirds as high as VCC, the threshold pin is turned on, and the output pin becomes low. At this point C1 starts discharging through R2. When C1 discharges, and the voltage across C1 decreases to a voltage one-third as high as VCC, the trigger pin is turned on, and the output voltage becomes high, causing the charge current to flow into C1 through R1 and R2 again. This operation is shown in Fig. e. Because C1 repeats charging and discharging between one-third as high as VCC and two-thirds as high as VCC, the oscillation frequency is not affected by the supply voltage. Oscillation is represented theoretically using the following expressions. When the output voltage is high, the charge time is Adding expressions (1) and (2) determines period T Therefore, the oscillation frequency is (see Fig. f for reference) The duty cycle is determined by the equation (5)
1.0
10
1. 0 M
10 M
0.1 0.01 0.001 0.1 1.0
10
10 k
0 k
k
(R1 + 2R2)
10
100 1.0 k 10 k 100 k
Oscillation frequency f (Hz) (Free running frequency)
: t1 = 0.693 (R1 + R2) C1 .......................................... (1) : T = t1 + t2 = 0.693 (R1 + 2R2) C1 .......................... (3) 1 T 1.44 (R1 + 2R2) C1 R2 R1 + 2R2
When the output voltage is low, the discharge time is : t2 = 0.693 * R2 * C1 ................................................. (2)
: f= : D=
=
...................................... (4)
........................................................ (5)
The values obtained this way are approximate values, however. If it is necessary to obtain an accurate oscillation frequency, determine R1, R2, and C1 through actual measurement and confirmation; a trimmer should be used as required. Moreover, R1 and R2 should be 300 or higher. Note 10. If the load is connected across the output and GND pins, a "staircase" occurs in the output waveform.
8
PC1555
8PIN PLASTIC DIP (300 mil)
8 5
1
A I
4
K P L
J
H G F D N
M
C B M R
NOTES 1) Each lead centerline is located within 0.25 mm (0.01 inch) of its true position (T.P.) at maximum material condition. 2) ltem "K" to center of leads when formed parallel.
ITEM A B C D F G H I J K L M N P R
MILLIMETERS 10.16 MAX. 1.27 MAX. 2.54 (T.P.) 0.500.10 1.4 MIN. 3.20.3 0.51 MIN. 4.31 MAX. 5.08 MAX. 7.62 (T.P.) 6.4 0.25 +0.10 -0.05 0.25 0.9 MIN. 0~15
INCHES 0.400 MAX. 0.050 MAX. 0.100 (T.P.) 0.020 +0.004 -0.005 0.055 MIN. 0.1260.012 0.020 MIN. 0.170 MAX. 0.200 MAX. 0.300 (T.P.) 0.252 0.010 +0.004 -0.003 0.01 0.035 MIN. 0~15
P8C-100-300B,C-1
9
PC1555
8 PIN PLASTIC SOP (225 mil)
8 5
detail of lead end
1 A
4
G
P
H I J
F
K
E
B C D M
M
L N
NOTE Each lead centerline is located within 0.12 mm (0.005 inch) of its true position (T.P.) at maximum material condition.
ITEM A B C D E F G H I J K L M N P
MILLIMETERS 5.37 MAX. 0.78 MAX. 1.27 (T.P.) 0.40 +0.10 -0.05 0.10.1 1.8 MAX. 1.49 6.50.3 4.4 1.1 0.15 +0.10 -0.05 0.60.2 0.12 0.10 3 +7 -3
INCHES 0.212 MAX. 0.031 MAX. 0.050 (T.P.) 0.016 +0.004 -0.003 0.0040.004 0.071 MAX. 0.059 0.2560.012 0.173 0.043 0.006 +0.004 -0.002 0.024 +0.008 -0.009 0.005 0.004 3 +7 -3 S8GM-50-225B-4
10
PC1555
RECOMMENDED SOLDERING CONDITIONS The conditions listed below shall be met when soldering the PC1555. Please consult with our sales offices in case any other soldering process is used, or in case soldering is done under different conditions. Surface-Mount Devices For details of the recommended soldering conditions, refer to our document SMD Surface Mount Technology
Manual (IEI-1207).
PC1555G2
Soldering process Infrared reflow Soldering conditions Peak package's surface temperature: 230C Reflow time: 30 seconds or less (at 210C or more) Maximum allowable number of reflow processes: 1 Exposure limit: NoneNote VPS Peak package's surface temperature: 215C Reflow time: 40 seconds or less (at 200C or more) Maximum allowable number of reflow processes: 1 Exposure limit: NoneNote Temperature in the soldering vessel: 260C or less Soldering time: 10 seconds or less Maximum allowable number of reflow processes: 1 Exposure limit: NoneNote Pin temperature: 300C or less Flow time: 10 seconds or less Exposure limit: NoneNote VP15-00 Symbol IR30-00
Wave soldering
WS60-00
Partial heating method
Note Exposure limit before soldering after dry-pack package is opened. Storage conditions: Temperature of 25C or less and maximum relative humidity of 65% or less Caution Do not apply more than a single process at once, except for "Partial heating method." Through-Hole Mount Devices
PC1555C
Soldering process Wave soldering Soldering conditions Temperature in the soldering vessel: 260C or less Soldering time: 10 seconds or less
REFERENCE
Document name NEC Semiconductor Device Reliability/Quality Control System Quality Grade on NEC Semiconductor Devices Semiconductor Device Mounting Technology Manual Semiconductor Device Package Manual Guide to Quality Assurance for Semiconductor Devices Semiconductor Selection Guide Document No. IEI-1212 IEI-1209 IEI-1207 IEI-1213 MEI-1202 MF-1134
11
PC1555
[MEMO]
No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Corporation or others. While NEC Corporation has been making continuous effort to enhance the reliability of its semiconductor devices, the possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or property arising from a defect in an NEC semiconductor device, customer must incorporate sufficient safety measures in its design, such as redundancy, fire-containment, and anti-failure features. NEC devices are classified into the following three quality grades: "Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a customer designated "quality assurance program" for a specific application. The recommended applications of a device depend on its quality grade, as indicated below. Customers must check the quality grade of each device before using it in a particular application. Standard: Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) Specific: Aircrafts, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices in "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact NEC Sales Representative in advance. Anti-radioactive design is not implemented in this product.
M4 94.11

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