At any rate

Micrel Semiconductor has introduced its 2.7Gbps AnyRate chipset family that’s targeted at Metro Area Network communications system manufacturers.

Micrel Semiconductor has introduced its 2.7Gbps AnyRate chipset family that’s targeted at Metro Area Network (MAN) communications system manufacturers.

The chip set comprises the SY87721L Clock and Data Recovery (CDR), SY87724L MUX/DEMUX, and the SY87729L AnyClock Fractional N Synthesizer chip. The devices operate at any rate and any protocol from 28 Mbps to 2.7Gbps.

The AnyRate SY87721L CDR is capable of recovering data from serial streams running from 28Mbps up to 2.7Gbps, while the SY87724L is a programmable data multiplexer and de-multiplexer that can handle 4, 5, 8, or 10 bits at rates up to 2.7Gbps.

For its part, the SY87729L AnyClock is claimed to be the industry’s first high performance Fractional N Synthesizer. It generates any frequency from 10MHz to 365MHz within 400ppm from an inexpensive, single 27MHz reference source and exceeds the SONET jitter generation specification. The part enables the SY87721L CDR to lock to any possible frequency in its range.

The AnyRate chipset can handle all of the commonly used communications speeds and protocols including OC-3/STM-1, OC-12/STM-4, OC-48/STM-16 with or without FEC, Fast Ethernet, Gigabit Ethernet, FDDI, ESCON, FEC, Fibre Channel, 2x Fibre Channel, as well as digital video rates outlined in SMPTE 259 and 292.

‘Metro Area Network communications system manufacturers must efficiently transport many protocols to enable multi-service platforms for their customers,’ said Zhong Li, Product Marketing Manager. ‘The AnyRate chipset, using the AnyClock Fractional N Synthesizer, enables them to build only one linecard with a low-frequency reference input for all their protocol requirements,’ he added.

The AnyRate chipset can be used for transponders and section repeaters, multiplexers (add-drop and access), SONET/SDH based transmission systems, Terabit routers and broadband crossconnects, and fibre optic test equipment for Metro Area applications.

The SY87721L is packaged in a 64-pin TQFP, SY87724L in an 80-pin LQFP and SY87729L in a 32-pin TQFP. Samples of the three devices are currently available now, and production quantities are stock to 8 weeks ARO. The SY87721L, SY87724L and SY87729L are priced at $48.00, $66.00 and $38.40 respectively, in 1,000-piece quantities.