Hysteretic power-up circuit

Details Hysteretic power-up circuit Hysteretic power-up circuit

1996-03-13

1997-04-01

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327205, 327545, H03K 3037

Patent

active

056170483

ABSTRACT:
A power-up circuit with hysteretic characteristics for regulating the activation of one or more output buffers of an extended logic circuit. The hysteresis of the power-up circuit of the invention permits turn on of a switching transistor of the circuit at one threshold voltage level and maintains the active state of that switching transistor until a second lower threshold voltage level. The hysteresis is achieved by providing two separate and electrically isolated control paths that are connected to the control node of the switching transistor. The first control path includes a plurality of diode devices designed to regulate the power supply level required to turn on the switching transistor. The second control path also includes diode devices but in lesser numbers so that, once the switching transistor is turned on by the first control path, it remains on in spite of fluctuations at the power supply rail.

REFERENCES:
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patent: 4405871 (1983-09-01), Buurma et al.
patent: 4481430 (1984-11-01), Houk
patent: 4697103 (1987-09-01), Ferris et al.
patent: 4754158 (1988-06-01), Halberstein
patent: 4967102 (1990-10-01), Mahler
patent: 5051611 (1991-09-01), Kantz
patent: 5111136 (1992-05-01), Kawashima

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