SNAS548C – FEBRUARY 2000 – REVISED MARCH 2013
LM555 Timer
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FEATURES
Direct Replacement for SE555/NE555
Timing from Microseconds through Hours
Operates in Both Astable and Monostable
Modes
Adjustable Duty Cycle
Output Can Source or Sink 200 mA
Output and Supply TTL Compatible
Temperature Stability Better than 0.005% per
°C
Normally On and Normally Off Output
Available in 8-pin VSSOP Package
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.
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APPLICATIONS
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Precision Timing
Pulse Generation
Sequential Timing
Time Delay Generation
Pulse Width Modulation
Pulse Position Modulation
Linear Ramp Generator
Schematic Diagram
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Copyright © 2000–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
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necessarily include testing of all parameters.
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