ACS8520BT

Application Specific Clock/Timing Overview

The ACS8520BT is a Synchronous Equipment Timing Source (SETS) designed for SONET and SDH Network Elements. Manufactured by Semtech, this single-chip solution generates SONET or SDH Equipment Clocks (SEC) and Frame Synchronization clocks. It supports Free-run, Locked, and Holdover modes with reference sources including recovered line clock, PDH network, and node synchronization. The device provides independent SEC and BITS/SSU clocks, an 8 kHz Frame Synchronization clock, and a 2 kHz Multi-Frame Synchronization clock. It features a Serial Port compatible with SPI for configuration and status register access, alongside IEEE 1149.1 JTAG boundary scan support.

Application Specific Clock/Timing Feature Summary

• Generates independent SEC, BITS/SSU, 8 kHz Frame Sync, and 2 kHz Multi-Frame Sync clocks
• Supports Stratum 3, 4E, 4, and SMC applications compliant with Telcordia GR-1244-CORE and ITU-T G.813
• Accepts up to four independent input SEC reference clock sources
• Includes SPI-compatible Serial Port and IEEE 1149.1 JTAG boundary scan

Application Specific Clock/Timing Applications

• SONET Network Element timing
• SDH Network Element timing
• Stratum 3/4E/4 synchronization systems
• SMC (SONET Minimum Clock) implementations

Application Specific Clock/Timing Part Context

The ACS8520BT belongs to the ACS852x family of SETS devices from Semtech. While specific electrical parameters for the 'B' suffix variant are not detailed in the provided documentation, it shares the core architecture with the ACS8520A and ACS8522. The 'T' suffix typically indicates tape-and-reel packaging, whereas the base model data specifies a 100-pin LFQFP package.