Input/output circuit for IC card

Details Input/output circuit for IC card Input/output circuit for IC card

1989-02-02

1990-03-27

James, Andrew J.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 3072964, 365228, H03K 1730, H03K 19092

Patent

active

049123467

ABSTRACT:
An input/output IC gate circuit inserted in the input or output lines of an IC memory card contains at least one input stage, for one of the input or output lines, in which a first MOSFET, a second MOSFET and a third MOSFET are connected in series between an external power source line and a grounding line. The first MOSFET is in an ON state when the voltage of the input or output line is in the vicinity of that of a power source and in an OFF state when the voltage is at 0 V. The second MOSFET is in an OFF state when the voltage of the input or output line is in the vicinity of the power source and in an ON state when the voltage is at 0 V. The third MOSFET is on/off controlled by a control signal delivered from a level detection circuit. The third MOSFET is turned on when the voltage of the external power source line exceeds a predetermined value which is one-half the voltage of the data backup battery or above.

REFERENCES:
patent: 3859638 (1975-01-01), Hume, Jr.
patent: 4587640 (1986-05-01), Saitoh
patent: 4612461 (1986-09-01), Sood
patent: 4791323 (1988-12-01), Austin
patent: 4849660 (1989-07-01), Hayashi et al.

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