The SY87721L is a complete Clock Recovery and Data retiming integrated circuit for data rates from 28Mbps up to 2.7Gbps NRZ including SONET FEC data rates. Included in the device, is a fully integrated Clock Multiplier Unit (CMU) that is capable of generating frequencies that cover the same data rate range as the CDR. The device is ideally suited for SONET/SDH/ATM, Fibre Channel, and Gigabit Ethernet applications, as well as other high-speed data transmission applications.