Patent ID: 7872495

Claim:
A unit cell for a programmable termination circuit, comprising: a first transistor having a first source node coupled to a first input node, having a first drain node coupled to a second input node, and having a first gate coupled to receive a first float control signal; a second transistor having a second source node coupled to the second input node, having a second drain node coupled to the first input node, and having a second gate coupled to receive a second float control signal; a third transistor having a third drain node coupled to the first input node, having a third source node coupled to a first termination voltage node, and having a third gate coupled to receive a first termination voltage control signal; a fourth transistor having a fourth drain node coupled to the second input node, having a fourth source node coupled to the first termination voltage node, and having a fourth gate coupled to receive the first termination voltage control signal; a fifth transistor having a fifth drain node coupled to the second input node, having a fifth source node coupled to a second termination voltage node, and having a fifth gate coupled to receive a second termination voltage control signal; and a sixth transistor having a sixth drain node coupled to the first input node, having a sixth source node coupled to the second termination voltage node, and having a sixth gate coupled to receive the second termination voltage control signal; wherein the first float control signal and the second float control signal are a first pair of complementary signals.