Semiconductor integrated circuit and IC card using the same

Details Semiconductor integrated circuit and IC card using the same Semiconductor integrated circuit and IC card using the same

1993-09-08

1996-05-14

Nguyen, Tan T.

Static information storage and retrieval

Addressing

Sync/clocking

36518901, 36518905, 235380, 235451, 235492, G11C 700

Patent

active

055174604

ABSTRACT:
A semiconductor integrated circuit includes: a writable non-volatile memory; a writing voltage-generating circuit for generating a writing voltage and supplying it to the non-volatile memory; an oscillating circuit for generating a first clock signal and supplying it to the writing voltage-generating circuit; a timer for measuring a time the writing voltage generated in the writing voltage-generating circuit is applied to the non-volatile memory; a control circuit for controlling writing in the non-volatile memory; and a switching device for selecting one of the first clock signal generated in the oscillating circuit and a second clock signal input from outside the integrated circuit in response to a control signal from the control circuit, thereby supplying the selected signal to the timer and the control circuit as a clock.

REFERENCES:
patent: 4752871 (1988-06-01), Spark et al.
patent: 4780602 (1988-10-01), Kawana et al.
patent: 5036460 (1991-07-01), Takahira et al.
patent: 5109359 (1992-04-01), Sakakibara et al.
patent: 5375083 (1994-12-01), Yamaguchi
patent: 5386539 (1995-01-01), Nishi
patent: 5406064 (1995-04-01), Takahashi
Data Sheets for MY5802-XXXF Smart Card, Mitsubishi Electric Company, 1992.
Jones, "Intelligent EEPROM Adds New Dimensions To Nonvolatile Memory", WESCON/83, 1983, pp. 1-4.
Cioaca et al, "A Million Cycle CMOS 256K EEPROM", IEEE Journal of Solid-State Circuits, vol. SC-22, No. 5, 1987, pp. 684-692.

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