High voltage detector to control a power supply voltage pump for a 2.5 volt semiconductor process device
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United States of America Patent
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-
Dec 19, 2000
Grant Date -
N/A
app pub date -
Mar 26, 1999
filing date -
Mar 27, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high voltage detector circuit (FIG. 2) maintains a voltage (V.sub.2) on a reference line driven by a charge pump by turning the charge pump on with a signal (PUMPON) when the reference line voltage (V.sub.2) drops below a reference voltage (V.sub.1) plus a CMOS transistor threshold voltage. The high voltage detector is further configured to use transistors which have a maximum gate to drain, or gate to source voltage which exceeds the pin supply voltage to the chip. The high voltage detector includes comparators made up of a series of current mirrors driven by weak current sources enabling the circuit to use a minimum amount of power.
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