Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1994-03-15
1996-01-09
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327198, H03K 17284
Patent
active
054831873
ABSTRACT:
A power-on reset circuit is disclosed comprising a capacitor for being charged to a desired voltage and then being discharged; a Schmitt trigger circuit for discriminating the voltage discharged from the capacitor and transitioning instantaneously its output when the discharged voltage reaches a predetermined level to output a reset signal, and then transitioning its output again after the lapse of a predetermined time period to maintain a constant voltage; a state latch circuit for inputting the output of the Schmitt trigger circuit, the state latch circuit being transitioned after the lapse of a predetermined time period from generation of the reset signal by the Schmitt trigger circuit and then remaining at the transitioned state; and an inverter for inverting an output voltage of the state latch circuit and applying the inverted output voltage to the capacitor. In accordance with the invention, the power-on reset circuit generates a reset pulse regardless of a voltage rise time, consumes little or no appreciable power after generation of the reset pulse, occupies a small space due to its efficient construction, and has a readily adjustable reset time.
REFERENCES:
patent: 4419596 (1983-12-01), Kikuchi
patent: 4716322 (1987-12-01), D'Arrigo et al.
patent: 5148051 (1992-09-01), Deierling et al.
patent: 5323066 (1994-06-01), Feddeler et al.
Callahan Timothy P.
Englund Terry L.
Hyundai Electronics Industries Co,. Ltd.
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