LM555 Timer

Description: 1 Features 3 Description 1 The LM555 is a highly stable device for generating • Direct Replacement for SE555/NE555 accurate time delays or oscillation. Additional • Timing from Microseconds through Hours terminals are provided for triggering or resetting if • Operates in Both Astable and Monostable Modes desired. In the time delay mode of operation, the time • Adjustable Duty Cycle is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the • Output Can Source or Sink 200 mA free running frequency and duty cycle are accurately • Output and Supply TTL Compatible controlled with two external resistors and one • Temperature Stability Better than 0.005% per °C capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source • Normally On and Normally Off Output or sink up to 200 mA or drive TTL circuits. • Available in 8-pin VSSOP Package Device Information(1) 2 Applications PART NUMBER PACKAGE BODY SIZE (NOM) • Precision Timing SOIC (8) 4.90 mm × 3.91 mm • Pulse Generation LM555 PDIP (8) 9.81 mm × 6.35 mm • Sequential Timing VSSOP (8) 3.00 mm × 3.00 mm • Time Delay Generation (1) For all available packages, see the orderable addendum at the end of the datasheet. • Pulse Width Modulation • Pulse Position Modulation • Linear Ramp Generator

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