The SY58620L is a low jitter, high-speed transceiver with a variable swing CML transmitter buffer and a CML high-gain receiver optimized for precision telecom and enterprise server transmission line and backplane data management. T he S Y58620L d istributes d ata t o 4.25Gbps guaranteed over temperature and voltage. The SY58620L transmitter differential input includes Micrel's unique, 3-pin input termination architecture that directly i nterfaces t o a ny ( AC- o r D C-coupled) differential signal as small as 100mV (200mVPP) without any termination resistor network in the signal path. The receiver d ifferential i nput i s o ptimized t o i nterface directly t o A C-coupled s ignals a s s mall a s 1 0mV (20mVPP). The outputs are 50 source-terminated CML with extremely fast rise/fall time. To support remote self-testing, the SY58620L features a high-speed loopback test mode. The input control signal LOOPBACK enables an internal loopback path from the transmitter input to the receiver output. The SY58620L operates from a 3.3V 10% supply and is guaranteed over the full industrial temperature range of 40C to +85C. The SY58620L is part of Micrel's