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Summary
Threshold Voltage
On trigger, Output goes high, timing cap charges, at 2/3 Vcc the pin 6 of an internal comparator senses it & trips. Pin 7 goes low discharging the cap. Pin 3 goes low too.
Trigger Voltage
The pulse/level at pin 2 should drop below 1/3 Vcc before the timer triggers.


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Threshold Voltage and Trigger Voltage - NE555 Page 13

Threshold Voltage and Trigger Voltage - NE555 from Signetics - Page 13


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