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Summary
Control Voltage
Pin 5, used for filtering in noisy environs. By imposing a voltage at 5, it is possible to vary the timing independent of RC. The CV can be from 45% to 90% of Vcc in Monostable mode.
Formulas of 555
Monostable - T = 1.1RC

Astable -
 F = 1.44/(Ra+2Rb)C


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Control Voltage and Formulas - NE555 Page 16

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