Fast power-on detect circuit with accurate trip-points

Details Fast power-on detect circuit with accurate trip-points Fast power-on detect circuit with accurate trip-points

2007-10-30

2009-08-04

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S198000, C327S539000

Reexamination Certificate

active

07570090

ABSTRACT:
A power-on reset circuit includes a first PNP transistor having an emitter, a base, and a collector coupled to ground; a second PNP transistor having an emitter coupled to the base of the first transistor, and a base and collector coupled to ground; a third PNP transistor having an emitter, a base coupled to the base of the first transistor, and a collector coupled to ground; a first resistor coupled between VDD and an internal node; a second resistor coupled between VDD and the emitter of the first transistor; a third resistor coupled between the internal node and the emitter of the third transistor; and a comparator having a first input coupled to the internal node and a second input coupled to the emitter of the first transistor for generating a power-on reset signal.

REFERENCES:
patent: 5070295 (1991-12-01), Morigami
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patent: 5867047 (1999-02-01), Kraus
patent: 6744291 (2004-06-01), Payne et al.
patent: 6847240 (2005-01-01), Zhou
patent: 6972602 (2005-12-01), Akamatsu
patent: 5-226995 (1993-09-01), None
Ramtron; “Preliminary FM1105 Nonvolatile 5V Dual State Saver”; Ramtron International Corporation; Rev. 1.0; May 2007; pp. 1-8; Colorado Springs, CO US.
Ramtron; “FM1106 Nonvolatile 3V Dual State Saver”; Ramtron International Corporation; Rev. 1.0; May 2007; pp. 1-8; Colorado Springs, CO US.
Ramtron; “FM1107 Nonvolatile 3V Dual State Saver”; Ramtron International Corporation; Rev. 1.0; May 2007; pp. 1-8; Colorado Springs, CO US.
Ramtron; “Preliminary FM1110 Nonvolatile 5V Quad State Saver”; Ramtron International Corporation; Rev. 1.0; Aug. 2007; pp. 1-8; Colorado Springs, CO US.
Ramtron; “FM1112 Nonvolatile 3V Quad State Saver”; Ramtron International Corporation; Rev. 1.0; Aug. 2007; pp. 1-8; Colorado Springs, CO US.
Ramtron; “FM1114 Nonvolatile 3V Quad State Saver”; Ramtron International Corporation; Rev. 1.0; Aug. 2007; pp. 1-8; Colorado Springs, CO US.

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