Semiconductor device
AssigneeRenesas Electronics Corporation
InventorsShigeyuki SUZUKI, Masato SUZUKI
Life of this patent
Estimating the term…
Abstract
Provided is a semiconductor device with an output circuit in which a variation of a common voltage is suppressed in an idling mode and in a normal mode. The output circuit provided in the semiconductor device includes a first termination resistor and a second termination resistor and a drive circuit which flows current through the termination resistors. The output circuit is configured so as to be able to adjust the value of current which flows through the first termination resistor and the second termination resistor or the value of resistance of the first termination resistor and the second termination resistor.
Claims4
A semiconductor device comprising:
- a first power node;
- a second power node, a power supply voltage being applied between the first power node and the second power node;
- and
- an output circuit which has a normal mode and an idling mode,
- wherein the output circuit comprises:
- a first output node;
- a second output node;
- a first termination resistor with variable resistance, coupled between the first power node and the first output node;
- a second termination resistor with variable resistance, coupled between the first power node and the second output node;
- and
- a drive circuit operable to flow a constant current between the first power node and the second power node via at least one of the first termination resistor and the second termination resistor,
- wherein, in the normal mode, when the drive circuit flows a constant current through one of the first termination resistor and the second termination resistor in response to a differential input signal, the output circuit outputs a differential signal corresponding to the input signal from the first output node and the second output node,
- wherein, in the idling mode, when the drive circuit flows a constant current through both of the first termination resistor and the second termination resistor, the output circuit outputs an idling voltage from the first output node and the second output node, and
- wherein the value of resistance of each of the first termination resistor and the second termination resistor in the idling mode is smaller than the value of resistance of each of the first termination resistor unit and the second termination resistor in the normal mode.
Dependencies are inferred from the claim text.