The SY87729L is a complete rate independent frequency synthesizer integrated circuit. From a single reference source, this device generates a differential PECL reference frequency for Micrel's SY87721L 10Mbps to 2.7Gbps combined CDR and CMU. The SY87729L generates an exactly correct reference frequency for common data transport protocols. This is especially important in transponder applications, where a standards compliant protocol data unit must be generated downstream, even in the absence of any signal from the associated upstream interface. In addition, SY87729L will generate exactly correct reference frequencies for common data transport protocols augmented by forward error correction codes. SY87729L accepts configuration via a MicroWire™ interface.Fractional synthesizer from 10MHz to 365MHz from a single 27MHz reference oscillator Generates exactly the correct frequency for common transport protocols with or without FEC Directly enables SY87721L to lock onto any data rate within its range Exceeds BellCore and ITU jitter generation specifications Programmable via MicroWire™ interface Available in 32-Pin EPAD-TQFP package