Patent ID: 8559492

Claim:
A transmitter-only integrated circuit (IC) chip with an external loopback test function, comprising: drivers mounted on the transmitter-only IC chip for transmitting data through transmit pads that are installed in correspondence to a plurality of channels; and a loopback test circuit for receiving data as external loopback data through one of the transmit pads set as a receive pad for a test, the data being transmitted through one of the remaining transmit pads, and then comparing the received external loopback data with original transmit data, wherein the loopback test circuit comprises: a receive buffer connected to one of the transmit pads and enabled to receive data transmitted through one of the remaining transmit pads when a corresponding driver is disabled; and a monitoring unit for comparing external loopback data outputted from the receive buffer with the original transmit data to generate a test result signal.