Power supply voltage level sensing circuit

Details Power supply voltage level sensing circuit Power supply voltage level sensing circuit

Filed on

1987-11-17

Date issued

1990-02-20

Examiner

Miller, Stanley D.

Patent Class

Electrical transmission or interconnection systems

SubClass

Nonlinear reactor systems

SubSubClass

Parametrons

Other Related Categories

3072965, 307350, 307363, H03K 301, H03K 5153, H03K 5159

Type

Patent

Status

active

Patent number

049029100

Description

ABSTRACT:
A power supply voltage level sensing circuit on an integrated circuit generates a reset signal that holds the components of the integrated circuit in a defined state when the power supply voltage level drops below a predetermined voltage. The reset signal is released when the power supply voltage level returns to above the predetermined voltage.
The voltage level sensing circuit is comprised of two inverters and a filter circuit. The inverters start to conduct at different power supply voltage levels and have different trigger point characteristics.
The power supply voltage level sensing circuit may be coupled with a power-on reset circuit to create a voltage sensing power-on reset circuit which generates a reset signal not only when the power supply voltage is first supplied to the circuit, but also when the power supply voltage level temporarily falls below a selected value.

REFERENCES:
patent: 4697097 (1987-09-01), Rusznyak

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