Low voltage inhibit circuit and integrated circuit using same

Details Low voltage inhibit circuit and integrated circuit using same Low voltage inhibit circuit and integrated circuit using same

1995-08-29

1997-04-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327206, 327539, 327544, H03K 1722, H03K 1730, H02H 324

Patent

active

056191561

ABSTRACT:
An integrated circuit (20) includes a low voltage inhibit (LVI) circuit (21) to protect an internal circuit (22) against losses in power supply voltage. The LVI circuit (21) includes primary (30) and secondary (35) LVI circuits. The primary LVI circuit (30) is a high-precision analog circuit which is selectively enabled when the secondary LVI circuit (35) senses that the power supply voltage is approaching a critical range. The primary LVI circuit (30) resets an internal circuit (22) of the integrated circuit (20) when it senses the power supply voltage falling below a critical level. Thus, the higher current primary LVI circuit (30) need only be enabled when a more precise power supply voltage measurement is required. The LVI circuit (21) also includes a disabling circuit (40) which latches an active output of the primary LVI circuit (30) and then disables the primary LVI circuit (30).

REFERENCES:
patent: 4296338 (1988-03-01), Thomas
patent: 4764839 (1988-08-01), Laud
patent: 4902910 (1990-02-01), Hsieh
patent: 5166546 (1992-11-01), Savignac et al.
patent: 5199032 (1993-03-01), Sparks et al.

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