发明名称 |
Power supply voltage step-down circuitry |
摘要 |
Power supply voltage step-down circuitry comprises a control unit for enabling either a first voltage step-down unit or a second voltage step-down unit according to a control signal applied thereto, a voltage checking unit for checking whether or not the value of a voltage generated by a power supply is equal to or greater than a predetermined value, and for furnishing a checking result signal at a predetermined level when the value of the voltage generated by the power supply is equal to or greater than a predetermined value, and a switching unit for connecting either the power supply or an output of the first step-down unit with a receiver, such as a ROM, according to whether or not the checking result signal from the voltage checking unit is at the predetermined level. The voltage checking unit includes a Schmidt circuit that furnishes the checking result signal at a level corresponding to the value of an output of a checking unit for furnishing the output having a value corresponding to the power supply voltage.
|
申请公布号 |
US6111395(A) |
申请公布日期 |
2000.08.29 |
申请号 |
US19990436245 |
申请日期 |
1999.11.09 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
HIRADE, TAKUYA;KOURA, MASATO;HONGO, KATSUNOBU |
分类号 |
G05F1/00;G05F1/10;G05F1/46;(IPC1-7):G05F1/445 |
主分类号 |
G05F1/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|