Power-on reset circuit

Details Power-on reset circuit Power-on reset circuit

1998-11-12

2000-12-12

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, H03K 1722

Patent

active

061604291

ABSTRACT:
A fabrication- and temperature-independent power-on reset circuit for providing improved control over live insertion of integrated circuitry. The reset circuit includes a comparator having an output terminal and two input terminals, one positive and one negative. One of the two terminals is coupled to a first threshold turn-on branch and the other terminal is coupled to a second threshold turn-on branch. Both threshold branches are referenced to ground but they supply different initial potentials to the terminals of the comparator. As a result, one terminal acting as the reference terminal holds the circuit output of the present invention at a potential designed to halt circuit power-on regardless of independent enable control pin signals. The other of the two terminals does not trigger switching of the comparator output until after a common supply power rail reaches a desired potential at initial turn-on. Referencing of the two threshold branches of the circuit to ground ensures that fabrication and temperature vagaries are effectively cancelled out.

REFERENCES:
patent: 4309627 (1982-01-01), Tabata
patent: 4874965 (1989-10-01), Campardo et al.
patent: 5378936 (1995-01-01), Kokubo et al.

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