Description
The ACS8515 is a highly integrated, single-chip solution for ‘hit-less’ protection switching of SEC clocks from Master and Slave SETS clockcards in a SONET or SDH Network Element. The ACS8515 has fast activity monitors on the inputs and will implement automatic system protection switching against master clock failure.

Features
• Suitable for Stratum 3, 4E and 4 SONET or SDH Equipment Clock (SEC) applications
• Meets AT&T, ITU-T, ETSI and Telcordia specifications
• Three SEC input clocks, from 2 kHz to 155.52 MHz
• Generates two SEC output clocks, up to 311.04 MHz
• Frequency translation of SEC input clock to a different local line card clock
• Robust input clock source frequency and activity monitoring on all inputs
• Supports Free-run, Locked and Holdover modes of operation
• Automatic ‘hit-less’ source switchover on loss of input
• External force fast switch between SEC inputs
• Phase build out for output clock phase continuity during input switchover
• SPI(1) compatible serial microprocessor interface
• Programmable wander and jitter tracking attenuation 0.1 Hz to 20 Hz
• Single +3.3 V operation. +5 V I/O compatible
• Operating temperature (ambient) -40°C to +85°C
• Available in 64 pin LQFP package
• Lead (pb)-free version available (ACS8515 Rev2.1T) RoHS and WEEE compliant.