发明名称 |
Overvoltage control circuitry |
摘要 |
Output overvoltage protection circuitry for circuits operating at low voltages (e.g., 3 v) interfacing to a higher voltage operating circuit (e.g., 5 v bus). To prevent problems with a pull-up PMOS device at the output when the bus is pulled-up to the higher voltage, a voltage node is provided in the circuit which follows the output voltage or the low supply voltage, whichever is higher, and a sub-circuit is provided to generate logic signals indicating when the bus is pulled too high. The PMOS device is then shut-down to prevent damage to the circuit.
|
申请公布号 |
US5654858(A) |
申请公布日期 |
1997.08.05 |
申请号 |
US19940332621 |
申请日期 |
1994.10.31 |
申请人 |
NORTH AMERICAN PHILIPS CORPORATION |
发明人 |
MARTIN, BRIAN C.;ANDERSON, ALMA;HANSON, HAROLD G. |
分类号 |
H02H9/04;H03K17/082;H03K19/003;(IPC1-7):H02H9/00 |
主分类号 |
H02H9/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|