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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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STC5455 Datenblatt(PDF) 1 Page - Connor-Winfield Corporation |
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STC5455 Datenblatt(HTML) 1 Page - Connor-Winfield Corporation |
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1 / 56 page  Page 1 of 56 TM121 Rev: P1.3 Date: October 24, 2011 © Copyright the Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice STC5455 Synchronous Clock for SETS Functional Specification Data sheet Preliminary Figure 1:Functional Block Diagram Description The RoHS 6/6 compliant STC5455 is a single chip clock synchronization solution for applications in SDH/SETS, SONET, and Synchronous Ethernet network elements. The device is fully compliant with ITU-T G.813 option 1 and 2, G.8262 EEC option 1and 2, Telcordia GR1244 and GR253. The STC5455 accepts 5 clock reference inputs, three exter- nal frame sync inputs (EX_SYNC1, 2, 3) and generates 4 synchronized clock outputs. Synchronized outputs may be programmed for wide variety of frequencies from 1MHz up to 156.25MHz, in 1kHz steps. Reference inputs are individ- ually monitored for activity and quality. Reference selection may be automatic, manual, or hard-wired manual. Two independent timing generators, T0 and T4, may oper- ate in the Freerun, Synchronized, Pseudo Holdover, and Holdover mode. Synchronization is operated in external timing mode while freerun and holdover are operated in self-timing mode. Each timing generator includes a DSP- based PLL. DSP-based PLL technology removes any exter- nal component except the oscillator. It provides excellent performance and reliability to STC5455. The STC5455 is clocked by an external oscillator (TCXO or OCXO). Using a well-chosen external oscillator ensures the STC5455 meet the required specifications and standards. Features - Complies with ITU-T G.813 opt1/2, G.8262 EEC opt1/2, Telcordia GR1244 and GR253 (Stratum3/4E/4/SMC) - Two timing generators, T0 and T4; T4 locks indepen- dently or locks to T0 - Supports Multiple-Master redundant application (T0 tim- ing generator only) - Accepts external oscillator at frequency of 10MHz, 12.8MHz, 19.2MHz, or 20MHz with programming - Accepts 5 clock reference inputs - Provides three 2kHz or 8kHz external frame sync inputs - Each reference input is monitored for activity and quality - Supports automatic frequency detection or manually acceptable frequency. - Automatic, manual, and hard-wired manual reference selection - Outputs 4 synchronized clock outputs, including 2 frame pulse outputs - 4 programmable clock synthesizers - Phase-align locking or hit-less reference switching - Programmable loop bandwidth, from 0.1Hz to 100Hz - Programmable phase skew in synthesizer level - SPI bus interface - Single 3.3V operation - IEEE 1149.1 JTAG boundary scan - Available in TQFP 64 package 5 Synth F Frame8K Frame2K EX_SYNC 1 T0 Timing SPI Interface CLK1, LVPECL/LVDS CLK8K Ref Monitor CLK2K 3 LVCMOS + 2 LVPECL/LVDS OCXO TCXO Generator T4 Timing Generator SRCSW Synthesizer G1 Ref Clk Synthesizer G2 Synthesizer GT4 CLK2 EX_SYNC 2 EX_SYNC 3 1MHz ~ 156.25MHz 1MHz ~ 156.25MHz 2.048MHz |
Ähnliche Teilenummer - STC5455 |
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Ähnliche Beschreibung - STC5455 |
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