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Summary
Trigger Mode
Pin 2 is the trigger input, falling edge of pulse triggers. Trigger Pulse should be shorter than RC.

Maximum Frequency
555 Oscillates upto 300 KHz. But use upto 200 KHz only for Temperature stability. 7555 goes upto 1 MHz.


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Trigger Mode and Maximum Frequency - NE555 Page 11

Trigger Mode and Maximum Frequency - NE555 from Signetics - Page 11


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