DESCRIPTION

· The ACS8522 is a highly integrated, single-chip solution for the Synchronous Equipment Timing Source (SETS) function in SONET or SDH Network Elements.

· It generates SONET or SDH Equipment Clocks (SEC) and Frame Synchronization clocks, fully compliant with international specifications.

· Supports Free-run, Locked, and Holdover modes, with mode selection controlled automatically or manually.

· Accepts up to four independent input SEC reference clock sources and generates independent SEC and BITS clocks.

· Includes a Serial Port for configuration and status registers access, and supports IEEE 1149.1 JTAG boundary scan.

FEATURES

· Suitable for Stratum 3, 4E, 4, and SONET Minimum Clock (SMC) applications.

· Accepts four individual input reference clocks with robust quality monitoring.

· Generates four output clocks and two Sync pulse outputs simultaneously.

· Programmable PLL bandwidth from 0.1 Hz to 70 Hz in 10 steps.

· Automatic hit-less source switchover on loss of input.

· Output phase adjustment in 6 ps steps up to ±200 ns.

· Available in LQFP 64-pin package with single 3.3 V operation, 5 V tolerant.

· Lead (Pb)-free version available, RoHS and WEEE compliant.

APPLICATIONS

· SONET or SDH Network Elements requiring Synchronous Equipment Timing Source (SETS) function.

· Systems needing SONET or SDH Equipment Clocks (SEC) and Frame Synchronization clocks.

· Applications requiring Free-run, Locked, and Holdover modes with robust input clock source quality monitoring.

· Environments needing programmable PLL bandwidth and automatic hit-less source switchover.