Power up detection circuit

A device to produce a first power detection signal comprising:

• a reference generator circuit for producing a reference voltage;
• detection circuit coupled to said reference generator circuit to detect said reference voltage as power is being applied to said device;
• power-up circuitry coupled to said detection circuity to produce said first power-up detection signal based on said reference voltage;
• reset circuitry coupled to said power-up circuitry to reset said power-up circuitry by establishing a DC current path to ground to conduct DC current on said DC current path after said first power up detection signal has been produced in order to reset said power-up circuitry to produce a second power-up detection signal after said first power-up detection, wherein said reset circuitry includes a transistor to conduct said DC current along said DC current path after said first power-up detection signal has been produced, wherein said reset circuitry includes storage circuitry to provide a source of power as said reference voltage is turned off.

A power-up detection circuitry to produce first power-up detection signal comprising:

• input circuitry to receive a reference voltage;
• detection circuitry coupled to said input circuitry to detect said reference voltage as power is being applied to said power-up detection circuitry;
• power-up circuitry coupled to said detection circuitry to produce said first power-up detection signal based on said reference voltage;
• reset circuitry coupled to said power-up circuitry to reset said power-up circuit by establishing a DC current path from said power-up circuitry to ground to conduct DC current on said DC current path after said first power-up detection has been produced and only after the reference voltage has reached a threshold voltage of a transistor of said reset circuit in order to reset said power-up circuit to produce a second power-up detection signal on said power-up circuitry.

A power-up detection circuit to produce a first power detection signal, comprising:

• input circuitry to receive a reference voltage;
• detection circuitry coupled to said input circuitry to detect said reference voltage as power is being applied to said power-up detection circuitry;
• power-up circuitry coupled to said detection circuitry to produce said first power-up detection signal based on said reference voltage;
• reset circuitry coupled to said power-up circuitry to reset said power-up circuit by establishing a DC current path to ground to conduct DC current on said DC current path after said first power-up detection has been produced in order to reset said power-up circuit to produce a second power-up detection signal on said power-up circuitry;
• wherein said reset circuitry includes a transistor to conduct said DC current along said DC current path after said first power-up detection signal has been produced, wherein said reset circuitry include storage circuitry to provide a source of power as said reference voltage is turned off.