Integratable solid state reset circuit operable over a wide temperature range
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United States of America Patent
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-
Mar 12, 1996
Grant Date -
N/A
app pub date -
Jun 20, 1994
filing date -
Jun 20, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reset circuit asserts, de-asserts and re-asserts a reset signal in response to a voltage applied between first and second nodes to which the reset circuit is connected. The reset signal includes a plurality of transistor switches connected together with positive feedback to achieve latching of the reset signal in either a high or a low state. The different inherent conductivity characteristics of the transistor switches causes the switches to begin closing when the applied voltage is at a first predetermined level and causes the transistor switches to begin opening when the applied voltage achieves a second predetermined lower level. The conductivity characteristics of the transistor switches cause the first and second predetermined levels to slightly vary over temperatures in the range of approximately -50.degree. C. to 150.degree. C., allowing reliable operation over a wide range of temperatures. The reset circuit may be integrated with the circuit which it resets.
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