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| S4850 Dual OC-48 SONET/SDH CRU with FEC Rate Support Product Brief PB2006_v1.00_01/26/05 www..com Overview S485 0 The dual S4850 supports clock recovery for the OC-48 (+ FEC) data rates. The differential serial data is input to the chip and clock recovery is performed on the incoming data stream. An external reference clock is required to minimize the PLL lock time and provide a stable output clock source in the absence of serial input data. Retimed data and clock are output from the S4850. The S4850 is divided into two independent clock recovery modules. Individual channel power off capability. Complies with Bellcore and ITU-T specifications for jitter tolerance, jitter transfer, and jitter generation. Suggested Interface Device * SONET/SDH OC-192/4xOC-48 Framer/ Pointer Processor * FPGAs * ASIC * SERDES without CDR - At a Glance - Features * * CMOS 0.13 micron technology Complies with Bellcore and ITU-T specifications for jitter tolerance, jitter transfer, and jitter generation On-chip high-frequency PLLs for clock generation and clock recovery Supports clock recovery for 2.488 Gbps (OC-48) with FEC Selectable reference clock source (155.52 MHz for SONET or equivalent for FEC) Directly compatible with 1.2 V CML I/O 1.2 V, 3.3 V, 2.5 V and 1.8 V supply Lock detect Signal detect input (SD[B:A]) Bypass Mode Individual channel power off capability Typical 400 mW 121 Plastic Ball Grid Array Package Description The function of the S4850 clock and data recovery unit is to derive high speed timing signals for SONET/SDHbased equipment. The S4850 receives an OC-48 scrambled NRZ signal and recovers the clock from the data. The chip outputs a differential bit clock and retimed data. Figure 1 shows a typical network application. The S4850 utilizes two on-chip PLLs which consist of a phase detector, a loop filter, and a voltage controlled oscillator (VCO). The phase detector compares the phase relationship between the VCO output and the serial data input. A loop filter converts the phase detector output into a smooth DC voltage, and the DC voltage is input to the VCO whose frequency is varied by this voltage. The S4850 is packaged in a 121 Plastic Ball Grid Array (PBGA), offering designers a small package outline. * * * * * * * * * * * Applications * * * * SONET/SDH/ATM/OC-48 with FEC rate Support SONET/SDH modules SONET/SDH test equipment Repeaters OTX ORX DATA DATA CLOCK Framer with Integrated SERDES or ASIC FPGA DATA CLOCK DATA ORX OTX S4850 DATA OTX ORX S4850 DATA CLOCK DATA CLOCK DATA ORX OTX Framer with Integrated SERDES or ASIC FPGA Figure 1. System Block Diagram Empowering Intelligent Optical Networks 1 S4850 Dual OC-48 SONET/SDH CRU with FEC Rate Support Product Brief PB2006_v1.00_01/26/05 www..com Prefix S - Integrated Circuit Device 4850 Package PB -121 PBGA X Prefix XXXX Device XX Package Figure 2. S4850 Ordering Information AMCC reserves the right to make changes to its products, its datasheets, or related documentation, without notice and warrants its produts solely pursuant to its terms and conditions of sale, only to sustantially comply with the latest available datasheet. Please consult AMCC's Term and Conditions of Sale for its warranties and other terms, conditions and limitations. AMCC may discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information is current. AMCC does not assume any liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. AMCC reserves the right to ship devices of higher grade in place of those of lower grade. AMCC SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. AMCC is a registered Trademark of Applied Micro Circuits Corporation. Copyright (c) 2005 Applied Micro Circuits Corporation. Distribute only on a need-to-know basis, and subject to applicable NDA. Not to be disclosed to or used by any other person without prior authorization. Confidential and Proprietary 6290 Sequence Drive * San Diego, CA 92121 * Tel: 858 450-9333 * Fax: 858 450-9885 * http://www.amcc.com 2 Empowering Intelligent Optical Networks |
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