Memory card circuit
US5016223A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1990 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Apr 17, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C5/143
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.