Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
An IC card having means for protecting erroneous operation comprising: a plastic card having a plurality of terminal pads located on the surface thereof, said plurality of terminal pads including a positive power supply terminal pad, a ground terminal pad, a reset signal input terminal pad, and a clock signal input terminal pad; an IC chip locating in said plastic IC card and being connected to said plurality of terminal pads; a potential reducing circuit connected between said positive power supply terminal pad and said reset terminal pad; and means for protecting erroneous operation of said IC chip comprising a first circuit for detecting incomplete contact between said power supply terminal pad and an external device to output a detecting signal, and a second circuit for generating a reset signal to stop operation of said IC chip in response to said detecting signal.
Claim 2
Dependent Claim
143 words
An IC card having means for protecting erroneous operation comprising: a plastic card having a plurality of terminal pads located on the surface thereof, said plurality of terminal pads including a positive power supply terminal pad, a ground terminal pad, a reset signal input terminal pad, and a clock signal input terminal pad; an IC chip locating in said plastic IC card and being connected to said plurality of terminal pads; a potential reducing circuit connected between said positive power supply terminal pad and said reset terminal pad; and means for protecting erroneous operation of said IC chip comprising a first circuit for detecting incomplete contact between said power supply terminal pad and an external device to output a detecting signal, and a second circuit for generating a reset signal to stop operation of said IC chip in response to said detecting signal.
Claim 3
Dependent Claim
51 words
An IC card according to claim 1, wherein the said first circuit has a transistor having a gate electrode receiving a potential on said power supply terminal pad, a source electrode connected to said reset signal input terminal pad, a drain electrode connected to an input of said reset signal generator.
Claim 4
Dependent Claim
81 words
An IC card according to claim 1, wherein said first circuit has a resistive potential divider connected between said positive power supply terminal pad and said ground terminal pad to produce a divided potential,and a transistor having a gate electrode receiving said divided potential, a drain electrode connected to said power supply terminal pad through a resistor and connected to an input of said reset signal input terminal pad, and a source electrode connected to said clock signal input terminal pad.
Claim 5
Dependent Claim
132 words
An IC card according to claim 1, wherein the said detector for said positive power supply terminal pad and said first circuit has a transistor having a gate electrode receiving a potential on said power supply terminal pad, a source electrode connected to said reset signal input terminal pad, a drain electrode connected to an input of said reset signal generator, and has a resistive potential divider connected between said positive power supply terminal pad and said ground terminal pad to produce a divided potential,and a transistor having a gate electrode receiving said divided potential, a drain electrode connected to said power supply terminal pad through a resistor and connected to an input of said reset signal input terminal pad, and a source electrode connected to said clock signal input terminal pad.
Claim 6
Dependent Claim
19 words
An IC card according to claim 1, wherein said potential reducing circuit comprises a plurality of diodes serially connected.
Claim 7
Dependent Claim
15 words
An IC card according to claim 1, wherein said second circuit comprises a flip-flop circuit.