Information card with dual power detection signals to memory decoder

Claim 1

An information card comprising: a plurality of volatile memory circuits for storing data; an internal battery for backing up data stored in the volatile memory circuits when a voltage supplied by an external power supply is below a predetermined voltage; power supply detecting means for outputting a power detection signal at a power detection output terminal when the voltage supplied by the external power supply exceeds the predetermined voltage; memory circuit enabling means for enabling changing of data stored in at least one of the volatile memory circuits, the memory circuit enabling means including a first enabling input terminal and a second enabling input terminal for receiving first and second enabling signals, respectively, for controlling the memory circuit enabling means, the second enabling input terminal receiving the power detection signal; and reducing means serially connected between the power detection output terminal and the first enabling input terminal for reducing high frequencies in the power detection signal and for preventing an electrostatic discharge from changing data stored in the volatile memory circuits.