IC card input/output control circuit

Details IC card input/output control circuit IC card input/output control circuit

1993-05-11

1995-01-03

Westin, Edward P.

Electronic digital logic circuitry

Interface

365206, 365 52, 36518905, 326 21, 326105, H03K 190175, H03K 1716

Patent

active

053789440

ABSTRACT:
An input/output control circuit for an IC card equipped with one-time programmable read only memory integrated circuits (PROM-ICs) includes a read data bus buffer connected between the one-time PROM-ICs and a data bus; a write data bus buffer connected between the one time PROM-ICs and the data bus; and a selection device for detecting the power supply voltage supplied to the one-time PROM-ICs and selecting one of the read data bus buffer and the write data bus buffer in response to the detected power supply voltage. The input/output control circuit improves the ability of the IC card to withstand electrostatic discharge and prevents the electrical characteristics of an IC card from changing with a change in the number of one-time PROM-ICs mounted thereon.

REFERENCES:
patent: 4498022 (1985-02-01), Koyama et al.
patent: 4916662 (1990-04-01), Mizuta
patent: 5016223 (1991-05-01), Kimura et al.
patent: 5025415 (1991-06-01), Masuyama et al.
patent: 5202852 (1993-04-01), Mizuta
patent: 5241662 (1993-08-01), Maniwa et al.

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