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What is 555?

This electronic component, produced by the manufacturer "STMicroelectronics", performs the same function as "General-purpose single bipolar timers".


555 Datasheet PDF - STMicroelectronics

Part Number 555
Description General-purpose single bipolar timers
Manufacturers STMicroelectronics 
Logo STMicroelectronics Logo 


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NE555
SA555 - SE555
General-purpose single bipolar timers
Features
Low turn-off time
Maximum operating frequency greater than
500 kHz
Timing from microseconds to hours
Operates in both astable and monostable
modes
Output can source or sink up to 200 mA
Adjustable duty cycle
TTL compatible
Temperature stability of 0.005% per °C
Description
The NE555, SA555, and SE555 monolithic timing
circuits are highly stable controllers capable of
producing accurate time delays or oscillation. In
the time delay mode of operation, the time is
precisely controlled by one external resistor and
capacitor. For a stable operation as an oscillator,
the free running frequency and the duty cycle are
both accurately controlled with two external
resistors and one capacitor.
The circuit may be triggered and reset on falling
waveforms, and the output structure can source
or sink up to 200 mA.
N
DIP8
(Plastic package)
D
SO8
(Plastic micropackage)
Pin connections
(top view)
1
2
3
4
1 - GND
2 - Trigger
3 - Output
4 - Reset
8
7
6
5
5 - Control voltage
6 - Threshold
7 - Discharge
8 - VCC
January 2012
Doc ID 2182 Rev 6
1/20
www.st.com
20

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555 equivalent
NE555 - SA555 - SE555
Electrical characteristics
Table 3.
Symbol
Tamb = +25° C, VCC = +5 V to +15 V (unless otherwise specified) (continued)
Parameter
SE555
NE555 - SA555
Min. Typ. Max. Min. Typ. Max.
Unit
VOH
High level output voltage
VCC = +15 VIO(sink) = 200 mA
IO(sink) = 100 mA
VCC = +5 V IO(sink) = 100 mA
12.5
13 13.3
3 3.3
12.7
5
2.75
12.5
13.3
3.3
V
Idis(off)
Discharge pin leakage current
(output high) Vdis = 10 V
Vdis(sat)
Discharge pin saturation voltage
(output low) (4)
VCC = +15V, Idis = 15 mA
VCC = +5V, Idis = 4.5 mA
tr Output rise time
tf Output fall time
toff Turn off time (5) (Vreset = VCC)
20 100
180 480
80 200
100 200
100 200
0.5
20 100 nA
180 480
80 200
100 300
100 300
0.5
mV
ns
µs
1. Tested at VCC = +5 V and VCC = +15 V.
2. This will determine the maximum value of RA + RB for 15 V operation. The maximum total (RA + RB) is 20 MΩ for +15 V
operation and 3.5 MΩ for +5 V operation.
3. Specified with trigger input high.
4. No protection against excessive pin 7 current is necessary, providing the package dissipation rating is not exceeded.
5. Time measured from a positive pulse (from 0 V to 0.8 x VCC) on the threshold pin to the transition from high to low on the
output pin. Trigger is tied to threshold.
Doc ID 2182 Rev 6
5/20


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1. Single Timer ( PDF )

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