Power down detector

Details Power down detector Power down detector

1980-09-22

1982-12-28

Stellar, George G.

Static information storage and retrieval

Powering

Data preservation

307200A, 307200B, 3072383, 307362, 307279, 340663, 361 92, 365 95, 365154, H02H 324, G08B 2100, H03K 500, H03K 326

Patent

active

043665608

ABSTRACT:
A circuit for detecting power supply variations in which a first and second transistor are connected in a cross-coupled mode. A load device is connected to each transistor and to a source of power. The loads are unbalanced such that upon application of power to the circuit a first state is always assumed. The cell is forced to its second state. A charge transfer device is connected between first and second nodes formed at the connection between the first transistor and its load and the second transistor and its load. Upon reduction of power supply voltage below that of the active node, a charge transfer takes place which allows the cell to return to its initial state. Detection of the initial state indicates loss or reduction of power has occurred.

REFERENCES:
patent: 3753011 (1973-08-01), Faggin
patent: 4013902 (1977-03-01), Payne

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