3-state bidirectional buffer and portable semiconductor storage device incorporating the same
US5248908A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1991 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Jun 13, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4072
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A 3-state bidirectional buffer is directly connected with a data bus for a PROM, and it comprises a voltage dropping means which inputs the program power-supply voltage supplied to the PROM, then drops the input program power-supply voltage, and a bidirectional bus control means which controls the direction of the data bus on the basis of the program power-supply voltage dropped and the program input signal supplied to the PROM. A portable semiconductor storage device comprises such a 3-state bidirectional buffer inserted in a data bus for at least one PROM, and a buffer means through which a program input signal is supplied from an external circuit to the PROM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.