Voltage drop circuit enabling ROM to read data with high reliabi

Details Voltage drop circuit enabling ROM to read data with high reliabi Voltage drop circuit enabling ROM to read data with high reliabi

1999-05-04

2000-05-30

Nelms, David

Static information storage and retrieval

Powering

365229, G11C 800

Patent

active

060698330

ABSTRACT:
A voltage drop circuit for generating an active voltage to be supplied to a ROM by dropping a supply voltage. The voltage drop circuit inhibits an access of a CPU to the ROM for a predetermined time period immediately after the ROM shifts from a standby mode to an active mode. This makes it possible to solve a problem of a conventional voltage drop circuit in that it is not unlikely that the CPU cannot read data correctly from the ROM for a moment immediately after the ROM shifts from the standby mode to the active mode because of fluctuations of the active voltage in that moment.

REFERENCES:
patent: 5212797 (1993-05-01), Miyake et al.
patent: 5898621 (1999-04-01), Takahashi et al.

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