Patent ID: 6909204

Claim:
A sequencing system for sequencing a first node voltage at a first node and a second node voltage at a second node which is less than the first node voltage, comprising: a bias circuit configured to provide a bias current in response to the first node voltage beginning to change to a first supply voltage, wherein the bias circuit includes a voltage reference circuit configured to provide a reference voltage; and a switch having an input configured to receive the reference voltage, wherein the switch is configured to provide a low impedance path between the first node and the second node when the bias circuit is providing the bias current, wherein the switch is configured to provide a high impedance path when the second node voltage is within a range of a second supply voltage which is less than the first supply voltage, wherein the reference voltage is equal to or less than the second supply voltage, wherein the range is equal to or greater than a difference between the second supply voltage and the reference voltage.