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SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015 LM555 Timer
1 Features 3 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 a stable 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 200 mA or drive TTL circuits. 1 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 …
