ACS8530T

Overview

The Semtech ACS8530T is a single-chip Synchronous Equipment Timing Source (SETS) designed for SONET and SDH Network Elements. It generates SEC, BITS, Frame Sync, and Multi-Frame Sync clocks while supporting Free-run, Locked, and Holdover modes. The device accepts up to 14 reference inputs and produces nine output clocks plus two sync pulses. It features programmable PLL bandwidth, automatic hit-less source switching, and phase transient protection. Operating on a single 3.3 V supply with 5 V tolerant inputs, the ACS8530T is compliant with Telcordia GR-1244-CORE Stratum 3E, GR-253, ITU-T G.812 Type III, and G.813 specifications.

Feature Summary

• Accepts 14 individual input reference clocks with robust quality monitoring
• Generates independent T0/T4 clocks, 8 kHz Frame Sync, and 2 kHz Multi-Frame Sync
• Absolute holdover accuracy better than 3 x 10^-10 (manual) and 7.5 x 10^-14 (instantaneous)
• Programmable PLL bandwidth from 0.5 mHz to 70 Hz in 18 steps

Applications

• Stratum 2, 3E, 3, 4E, and 4 network synchronization
• SONET Minimum Clock (SMC) applications
• SONET/SDH Equipment Clock (SEC) implementations

Procurement Notes

Verify that the ordering suffix 'T' corresponds to the lead-free version of the ACS8530. Confirm RoHS and WEEE compliance status through official documentation or manufacturer certification before procurement. Ensure the package matches the LQFP 100 specification required for the target application.

Selection Notes

Select the ACS8530T when a fully integrated SETS solution is required for SONET/SDH environments. The device supports Master/Slave redundancy configurations using two units. Consider the microprocessor interface options (Intel, Motorola, Serial, Multiplexed, or EPROM boot) based on system control architecture requirements.

Part Context

The ACS8530T is the lead-free variant of the ACS8530 SETS. It utilizes Digital Phase Locked Loop (DPLL) technology for stable performance across temperature and voltage variations. The component replaces traditional analog PLL solutions by providing precise frequency synthesis and repeatable jitter/wander attenuation characteristics.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. System compatibility should be verified against existing designs requiring Stratum 3E timing sources.

FAQ

What is the absolute holdover accuracy of the ACS8530T?

The device provides an absolute holdover accuracy better than 3 x 10^-10 in manual mode and 7.5 x 10^-14 in instantaneous mode.

How many input reference clocks does the ACS8530T support?

The ACS8530T accepts 14 individual input reference clocks, all equipped with robust input clock source quality monitoring.

What standards does the ACS8530T comply with?

It complies with Telcordia GR-1244-CORE Stratum 3E, GR-253, ITU-T G.812 Type III, and G.813 specifications.