Reset Timing Circuit of Power Supply Connection

Published:2011/7/25 23:39:00 Author:Michel | Keyword: Power Supply, Reset Timing Circuit | From:SeekIC

Picture 1 is reset circuit of power supply connection.The function of NE555 feet 4 is that it works when it is connected to high PWL and it resets when it is connected to low PWL.R3 and C2 are connected to feet 4,this circuit has time constant functions. Therefore, the power supply is connected,feet 4 won't rise to + Ucc immediately,which needs R3 and C2 constant delay.In this period, even if feet 2 inputs pulse, feet 3 trigger output still remains low level.R2 and R4 are ME555 current limiting resistance and TTL level triggering pulse triggers NE555 feet 2 directly via R2.VD1 is the diode which makes C2 discharge fast when the power supply is off and it outputs pulse width T=R5C4.



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