发明授权
US6069833A Voltage drop circuit enabling ROM to read data with high reliability
失效
电压降电路使ROM能够高可靠性地读取数据
- 专利标题： Voltage drop circuit enabling ROM to read data with high reliability
- 专利标题（中）： 电压降电路使ROM能够高可靠性地读取数据
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申请号： US304666申请日： 1999-05-04
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公开(公告)号： US6069833A公开(公告)日： 2000-05-30
- 发明人: Masato Koura
- 申请人： Masato Koura
- 申请人地址： JPX Tokyo
- 专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人： Mitsubishi Denki Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX11-000736 19990105
- 主分类号： G06F12/16
- IPC分类号： G06F12/16 ; G05F1/56 ; G11C5/14 ; G11C8/00
摘要：
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.
公开/授权文献
- US5495278A Image forming apparatus including a pulse width modulator 公开/授权日：1996-02-27