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STMicroelectronics Electronic Components Datasheet

NE555 Datasheet

GENERAL PURPOSE SINGLE BIPOLAR TIMERS

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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


STMicroelectronics Electronic Components Datasheet

NE555 Datasheet

GENERAL PURPOSE SINGLE BIPOLAR TIMERS

No Preview Available !

Schematic diagrams
1 Schematic diagrams
Figure 1. Block diagram
VCC+
THRESHOLD
CONTROL VOLTAGE
TRIGGER
RESET
5kΩ
COMP
R
FLIP-FLOP
5kΩ
COMP
Q
S
INHIBIT/
RESET
5kΩ
S
Figure 2. Schematic diagram
NE555 - SA555 - SE555
DISCHARGE
OUT
2/20 Doc ID 2182 Rev 6


Part Number NE555
Description GENERAL PURPOSE SINGLE BIPOLAR TIMERS
Maker ST Microelectronics
Total Page 20 Pages
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