ACS8520: Synchronous Equipment Timing Source (SETS) for Stratum 3/4E/4 and SMC Systems

• Highly integrated single-chip solution for the synchronous equipment timing source (SETS) function in a SONET or SDH network
• Suitable for Stratum 3, 4E, and 4, and SONET minimum clock (SMC) or SONET/SDH equipment clock (SEC) applications
• Meets specifications
  • Telcordia (Bellcore) 1244-CORE
  • Stratum 3
  • GR-253
  • ITU-T G.813 Options I and II
• Accepts 14 individual input reference clocks, all with robust input clock source quality monitoring
• Simultaneously generates nine output clocks, plus two sync-pulse outputs
• Absolute holdover accuracy better than 3 x 10^-10 (manual), 7.5 x 10^-14 (instantaneous); holdover stability defined by choice of external XO
• Programmable PLL bandwidth, for wander and jitter tracking/attenuation, 0.1 Hz to 70 Hz in 10 steps
• Automatic hit-less source switchover on loss of input
• Phase transient protection and phase build-out on locked-to reference and on reference switching
• Microprocessor interface
  • Intel
  • Motorola
  • Serial
  • Multiplexed
  • Boot from EPROM
• Output phase adjustment in 6 ps steps up to ± 200 ns
• IEEE 1149.1 JTAG boundary scan
• Single 3.3 V operation; 5 V tolerant
• LQFP-100 package
• Lead (Pb) - free version available (ACS8520T), RoHS and WEEE compliant.

Block Diagram

Click diagram to enlarge

LQFP100

• ACS8520 : NCNR, 90 per tray, ok to order partial tray quantities
• ACS8520T: Lead-free, RoHS and WEEE compliant, NCNR, 90 per tray, ok to order partial tray quantities