UPC1555 Datasheet, PDF (1/12 Pages) NEC – TIMER CIRCUIT

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 kΩ
Q6 Q5
Q11
R3
5 kΩ
6
Q1
Q4
Threshold ₂ Q2 Q3
5(3V_CC)
Control
1
R1
10 kΩ
GND
R4
5 kΩ
Q15
Q16
2
Trigger
Q8 Q9
Q7
Q10
Reset ⁴ _Q25
7
Discharge
Q14
Q12
Q13
R5
5 kΩ
R11
Q22
6.2
kΩ
R6
7.5kΩ
Q21
Q27
Q28
R12
3.9
kΩ
Q17
R7
4.7 kΩ
3
Q24 _Output
Q19
Q18
Q20
R10
Q23 120
R8
100
Ω
Q26
R9
3.3kΩ
Document No. G10649EJ6V0DS00 (6th edition)
(Previous No. IC-1979)
Date Published November 1995 P
©
Printed in Japan
1986