1 Features

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

• Temperature Stability Better than 0.005% per °C

• Normally On and Normally Off Output

• Available in 8-pin VSSOP Package

2 Applications

• Precision Timing

• Pulse Generation

• Sequential Timing

• Time Delay Generation

• Pulse Width Modulation

• Pulse Position Modulation

• Linear Ramp Generator

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.