Datasheet NE555, SA555, NA555 (Diodes)

NE555/SA555/NA555 PRECISION TIMERS Description Pin Assignments
These devices are precision timing circuits capable of
(Top View)
producing accurate time delays or oscillation. In the time- delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. GND V CC In the astable mode of operation, the frequency and duty TRIG DISCH cycle can be controlled independently with two external resistors and a single external capacitor. OUT THRES The threshold and trigger levels normally are two-thirds and RESET CONT one-third, respectively, of VCC. These levels can be altered
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by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the output
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goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, and the output goes low. When the output is low, a low- impedance path is provided between discharge (DISCH) and
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ground. The output circuit is capable of sinking or sourcing current up to 200mA. Operation is specified for supplies of 5V to 15V. With a 5-V supply, output levels are compatible with TTL

inputs.
Features
• Timing from microseconds to hours • Astable or monostable operation • Adjustable duty cycle • TTL compatible output can source or sink up to 200mA • “Green” Molding Compound (No Br, Sb) • Lead Free Finish/ RoHS Compliant (Note 1) Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.

NE555/SA555/NA555 1 of 14 February 2012 Document number: DS35112 Rev. 4 - 2
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