Patent ID: 7579871

Claim:
A current drive circuit comprising: a differential voltage detector configured to detect a voltage level of a drive node, configured to compare the voltage level of the drive node with a voltage level of a reference voltage to determine whether the voltage level of the drive node is smaller or larger than the voltage level of the reference voltage, and configured to generate a comparison signal according to a result of the determination; a control logic circuit configured to generate a control signal to provide a current to the drive node based on the comparison signal; and a current driver configured to provide the current for the drive node based on the control signal, wherein the control logic circuit comprises: a control signal generator configured to activate a first bit of the control signal using a state transition of a first bit of the comparison signal when a mode of a current mode bus interface system transitions from a suspend mode to a normal operation mode, and configured to activate a second bit of the control signal using a state transition of a second bit of the comparison signal when the mode of the current mode bus interface system transitions from the normal operation mode to the suspend mode; and a control signal reset circuit configured to deactivate the first bit of the control signal using the state transition of the first bit of the comparison signal after the first bit of the control signal is activated, and configured to deactivate the second bit of the control signal using the state transition of the second bit of the comparison signal after the second bit of the control signal is activated.