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Summary
Reset Voltage
Its an Inhibit, When pin 4 Reset is > 1V, device is ON. When Pin 4 is < 0.4V  Output goes Low. When Reset goes high, Output is Low till 555 Triggered.
Initial Accuracy
Value is Typ 1%. Timing Repeatability from Device to Device. Also same device with age. The RC and Vcc being the same.


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Reset Voltage and Initial Accuracy - NE555 Page 12

Reset Voltage and Initial Accuracy - Signetics NE555 Page 12


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