Memory card circuit

Details Memory card circuit Memory card circuit

1990-04-17

1991-05-14

Moffitt, James W.

Static information storage and retrieval

Powering

Data preservation

365 52, 36518905, 365226, G11C 514

Patent

active

050162233

ABSTRACT:
A memory card circuit for a portable memory card includes a unidirectional non-inverting buffer with an analog switch connected to an input terminal of a semiconductor memory and a bidirectional 3-state buffer with an analog switch connected to an input/output terminal of the memory card. An analog switch connected is series to a terminal signal of the semiconductor memory and a second analog switch connected in parallel to ground in parallel interfaces the card to a terminal unit. A transistor connected in series between a power supply input from the terminal unit and an internal power supply of the memory card, a supply voltage detecting circuit having inputs of a card insertion and extraction signal and a supply voltage of the memory card produces an output signal for turning ON or OFF the series transistor, the unidirectional non-inverting buffer with the analog switch and the bidirectional 3-state buffer with the analog switch.

REFERENCES:
patent: 4587640 (1986-05-01), Saitoh
patent: 4654829 (1987-03-01), Jiang et al.
patent: 4677593 (1987-06-01), Davis
patent: 4831595 (1989-05-01), Bone
patent: 4858196 (1989-08-01), Hein

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