Datasheet NE555, SA555, NA555 (Diodes) - 2

NE555/SA555/NA555 PRECISION TIMERS Pin Descriptions Pin Name Pin Number Description
GND 1 Ground TRIG 2 Trigger set 1/3VCC OUT 3 Timer output RESET 4 Reset active low CONT 5 External adjustment of internal threshold and trigger voltages THRES 6 Threshold set to 2/3 VCC
T
DISCH 7 Low impedance discharge path VCC 8 Chip supply voltage
UC Functional Block Diagram NEW PROD RESET can override TRIG, which can override THRESH Functional Table Nominal Trigger Threshold Discharge Pin Name Output Voltage Voltage Switch
GND Irrelevant Irrelevant Low On TRIG <1/3VCC Irrelevant High Off OUT <1/3VCC <2/3VCC Low On RESET <1/3VCC <2/3VCC As previously established NE555/SA555/NA555 2 of 14 February 2012 Document number: DS35112 Rev. 4 - 2
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