Memory card control device

Details Memory card control device Memory card control device

1994-05-17

1995-09-12

Nelms, David C.

Static information storage and retrieval

Powering

36518911, 235441, 235492, 348231, G11C 700, G06K 706

Patent

active

054503655

ABSTRACT:
In a memory card control device for interfacing an electronic still camera or similar electronic equipment and a memory card removably mounted on the equipment, a data processing device operates only at a supply voltage of 5 volts while a logic circuit operates at a supply voltage of 3 volts. A first level shifter converts the level of signals output from the memory card to a level matching the logic circuit. A second level shifter converts the level of signals output from the logic circuit to 5 volts and transfers it to the processing device, while converting the level of signals output from the processing device to 3 volts and feeding it to the logic circuit. The control device accommodates various kinds of memory cards each having a particular rated supply voltage.

REFERENCES:
patent: 5031149 (1991-07-01), Matsumoto et al.
patent: 5058063 (1991-10-01), Wada et al.
patent: 5202855 (1993-04-01), Morton
patent: 5297095 (1994-03-01), Sato et al.

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