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Exar multifunction, multichannel PHY interface chips debut

Posted: 27 May 2002 ?? ?Print Version ?Bookmark and Share

Keywords:xrt75lxx? xrt75l06? xrt75l12? xrt75l04d? xrt75l02d?

Exar Corp. has launched four single-chip PHY ICs that combine an LIU with a desynchronizer and a jitter attenuator, and four additional LIU ICs with just the jitter attenuator.

The XRT75Lxx products take the capabilities previously available in single-channel devices from Exar and extend them to as many as 12 channels.

Separately, the company added two low-power, multichannel devices, the XRT73L06 and the XRT73L12, to its line of high-density ICs for DS3/E3/STS-1 transmission. The six- and 12-channel products target multiservice access equipment, digital cross-connect systems and channelized data aggregation units, where board space and power dissipation are critical design elements.

Exar's XRT75Lxx LIU and desynchronizer products include the two-channel XRT75L02D, four-channel XRT75L04D, six-channel XRT-75L06D and 12-channel XRT75L12D. Each addresses the desynchronization tasks required when data is being exchanged between synchronous Sonet/SDH and asynchronous DS3/E3 networking environments.

Target applications include access equipment, digital cross-connect systems, routers, and DSL access multiplexers.

Exar's two-, four-, six- and 12-channel XRT75L02, XRT75L04, XRT75L06 and XRT75L12 products are designed for applications that require jitter attenuation but not desynchronization.

XRT75Lxx devices integrate a transmitter, receiver and clock and data recovery (CDR) circuits, and a crystal-less jitter attenuator. They also include a B3ZS/HDB3 encoder/decoder, a tristate output capability for the transmit drivers, line-monitoring circuitry for redundancy applications and a pseudo-random binary sequence generator and detector with the ability to insert and detect single-bit errors.

The D series also includes circuitry for desynchronizing the clock when converting from the SONET/SDH environment to DS3 or E3.

Each channel of each device can be configured independently to support DS3 (44.736Mbps), E3 (34.368Mbps) or SONET STS-1 (51.84Mbps). In 1,000-piece quantities, the two-channel XRT75L02 and XRT-75L02D, each in 100-pin low-profile QFP, are priced at $52.06 and $97.07, respectively.

The four-channel XRT75L04 and XRT75L04D are each packaged in a 144-pin LQFP and priced at $93.16 and $140, respectively.

The six-channel XRT75L06 and XRT75L06D each come in a 208-pin QFP and are priced at $147.96 and $200, respectively.

The 12-channel XRT75L and XRT75L12D, in a 432-pin ball grid array, are priced at $295.92 and $400, respectively. The XRT73L06, in a 208-pin QFP, is priced at $96.28 in 1,000-piece quantities. Samples are available now with production set for August.

The XRT73L12 is available in a 432-pin BGA package and is priced at $192.56.

EE Times





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