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US 7,126,371 B2Granted
Multi-function IC card
AssigneeKabushiki Kaisha Toshiba
InventorsHiroo Nakano, Shinichi Hasebe
Life of this patent
Estimating the term…
Abstract
When a reset signal /RESET is “L”, a flip-flop circuit holds “1”; on the other hand, a flip-flop circuit holds “0”. When the reset signal /RESET becomes “H”, the flip-flop circuits captures data in synchronous with a clock signal. When a power supply voltage returns to the initial value after an instantaneous blackout occurs, the data of the flip-flop circuits have the same value. An output signal of an exclusive-OR gate circuit becomes “L”, the output is held in a flip-flop circuit. As a result, an instantaneous blackout detection signal becomes “H”.
Claims7
An instantaneous blackout detecting circuit comprising:
- a plurality of flip-flop circuits connected like a ring;
- and
- logic circuits making an exclusive-OR operation of output signals of mutually adjacent two flip-flop circuits of said plurality of flip-flop circuits,
- wherein the initial condition is set so that data of mutually adjacent two flip-flop circuits of the several flip-flop circuits becomes mutually different value.
1 more element
Dependencies are inferred from the claim text.