| 摘要 |
<p>A protection circuit (1) comprising a first and second supply line (8, 9) at a first and second supply voltage (VCC, VPP) respectively; a reference voltage source (3); a comparator (2) connected to the first supply line (8) and the source; and a switch (30) controlled by the comparator via a control terminal and located between the second supply line (9) and the output (31) of the circuit (1). To reduce static consumption of the comparator (2) under normal operating conditions, the circuit (1) comprises enabling control elements (4-6, 29) connected to the two supply lines (8, 9) and to the comparator (2) for disabling the comparator and turning on the switch (30) when the two supply voltages differ by a value below a predetermined threshold, but are greater than a reference value. <IMAGE></p> |
