XRT91L32：STS-12/STM-4 or STS-3/STM-1 SONET/SDH Transceiver _ BDTIC 中国领先电子元器件代理商

XRT91L32：STS-12/STM-4 or STS-3/STM-1 SONET/SDH Transceiver

The XRT91L32 is a fully integrated SONET/SDH transceiver for SONET/SDH 622.08 Mbps STS-12/STM-4 or 155.52 Mbps STS-3/STM-1 applications. The transceiver includes an on-chip Clock Multiplier Unit (CMU), which uses a high frequency Phase-Locked Loop (PLL) to generate the high-speed transmit serial clock from a slower external clock reference. It also provides Clock and Data Recovery (CDR) function by synchronizing its on-chip Voltage Controlled Oscillator (VCO) to the incoming serial data stream. The internal CDR unit can be disabled and bypassed in lieu of an externally recovered received clock from the optical module. Either the internally recovered clock or the externally recovered clock can be used for loop timing applications. The chip provides serial-to-parallel and parallel-to-serial converters using an 8-bit wide LVTTL system interface in both receive and transmit directions. The transmit section includes an option to accept a parallel clock signal from the framer/mapper to synchronize the transmit section timing. The device can internally monitor Loss of Signal (LOS) condition and automatically mute received data upon LOS. An on-chip SONET/SDH frame byte and boundary detector and frame pulse generator offers the ability recover SONET/SDH framing and to byte align the receive serial data stream into the 8-bit parallel bus.

技术特性

Targeted for SONET STS-12/STS-3 and SDH STM-4/STM-1 Applications
Selectable full duplex operation between STS-12/STM-4 standard rate of 622.08 Mbps or STS-3/STM-1 155.52 Mbps
Single-chip fully integrated solution containing parallel-to-serial converter, clock multiplier unit (CMU), serial-to-parallel converter, clock data recovery (CDR) functions, and a SONET/SDH frame and byte boundary detection circuit
Ability to disable and bypass onchip CDR for external based received reference clock recovery thru Differential LVPECL input pins XRXCLKIP/N
8-bit LVTTL parallel data bus paths running at 77.76 Mbps in STS-12/STM-4 or 19.44 Mbps in STS-3/STM-1 mode of operation
Uses Differential LVPECL or Single-Ended LVTTL CMU reference clock frequencies of either 19.44 MHz or 77.76 MHz for both STS-12/STM-1 or STS-3/STM-1 operations
Optional use of 77.76 MHz Single-Ended LVTTL input for independent CDR reference clock operation
Able to Detect and Recover SONET/SDH frame boundary and byte align received data on the parallel bus
Diagnostics features include LOS monitoring and automatic received data mute upon LOS
Provides Local, Remote and Split Loop-Back modes as well as Loop Timing mode
Optional flexibility to re-configure the transmit parallel bus clock output to a clock input and accept timing signal from the framer/mapper device to permit the framer/mapper device time domain to be synchronized with the transceiver transmit timing.
Meets Telcordia, ANSI, Bellcore TR-NWT-000253 and GR-253-CORE, and G.783 ITU-T jitter requirements
Operates at 3.3V with 3.3V I/O
Less than 660mW in STS-3/STM-1 mode or 800mW in STS-12/STM-4 mode Typical Power Dissipation
Package: 10 x 10 x 2.0 mm 100-pin QFP
Pb-Free, RoHS Compliant Versions Offered