Integrated circuit with both battery-powered and signal-line-pow

Details Integrated circuit with both battery-powered and signal-line-pow Integrated circuit with both battery-powered and signal-line-pow

1991-07-10

1994-03-22

Pascal, Robert J.

Static information storage and retrieval

Powering

Data preservation

365226, 365177, 36518901, G11C 700

Patent

active

052970990

ABSTRACT:
An integrated circuit, in which some areas of the chip are powered from battery, but at least two other areas of the chip can draw power from independent on-chip power-storage capacitors (which are diode-isolated to accumulate charge from an external signal line). The signal line's input buffer draws power from one capacitor, and the decoder logic draws power from another. Thus, even if the first capacitor is depleted by the signal line's staying in the high-current regime, it will be powered up again when the signal line is again driven high; and the charge stored in the second capacitor will permit the decoding logic to operate. Preferably the second capacitor also powers circuitry which encodes a unique serial number for the chip. Thus, even after the battery has died, the chip can be interrogated to ascertain its unique serial number.

REFERENCES:
patent: 3859638 (1975-01-01), Hume, Jr.
patent: 4399524 (1983-08-01), Muguruma
patent: 5111058 (1992-05-01), Martin
patent: 5121359 (1992-06-01), Steele

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