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LM555 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM555
Description  Timer
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM555
Timer
General Description
The LM555 is a highly stable device for generating accurate
time delays or oscillation. Additional terminals are provided
for triggering or resetting if desired. In the time delay mode of
operation, the time is precisely controlled by one external
resistor and capacitor. For astable operation as an oscillator,
the free running frequency and duty cycle are accurately
controlled with two external resistors and one capacitor. The
circuit may be triggered and reset on falling waveforms, and
the output circuit can source or sink up to 200mA or drive
TTL circuits.
Features
n
Direct replacement for SE555/NE555
n
Timing from microseconds through hours
n
Operates in both astable and monostable modes
n
Adjustable duty cycle
n
Output can source or sink 200 mA
n
Output and supply TTL compatible
n
Temperature stability better than 0.005% per ˚C
n
Normally on and normally off output
n
Available in 8-pin MSOP package
Applications
n
Precision timing
n
Pulse generation
n
Sequential timing
n
Time delay generation
n
Pulse width modulation
n
Pulse position modulation
n
Linear ramp generator
Schematic Diagram
00785101
July 2006
© 2006 National Semiconductor Corporation
DS007851
www.national.com




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