Patent ID: 8896349

Claim:
A low voltage detector including terminals for coupling to a first power supply terminal and to a second power supply terminal of a power supply, the low voltage detector comprising: a power supply voltage monitor circuit for monitoring a voltage at the first power supply terminal and for producing a voltage V sp related to the voltage at the first power supply terminal, the power supply voltage monitor circuit having a temperature variation coefficient; a voltage generator, for generating a reference voltage V xm related to a voltage at the second power supply terminal, the voltage generator including a single array of a plurality of self-cascode MOSFET (SCM) structures arranged in a cascade configuration, the voltage generator having a temperature variation coefficient that is similar to the temperature variation coefficient of the power supply voltage monitor circuit; and a voltage comparator, having a first comparator input coupled to the power supply voltage monitor circuit for coupling the voltage V SP to the first comparator input, and having a second comparator input coupled to the voltage generator for coupling the voltage V xm to the second comparator input, the voltage comparator for outputting a low voltage detect output signal in response to a differential voltage between V xm and V SP , wherein the voltages V xm and V sp have a substantially same voltage rate of change and in a same direction with respect to temperature based on the similar temperature variation coefficient of the power supply voltage monitor circuit and the voltage generator, wherein the low voltage detect output signal changes state when the voltage V SP equals the voltage V xm .