ACS8595T

Overview

The ACS8595T is a line card protection switch for SONET/SDH AdvancedTCA systems. It provides hit-less protection switching of SEC and Sync clock groups from Master, Slave, and Stand-by sources. The device features three input groups with activity monitors and supports frequency translation to generate up to six independent output clocks ranging from 2 kHz to 311.04 MHz. It utilizes Digital Phase Locked Loop (DPLL) technology for precise performance across temperature and voltage variations. The component operates on a single 3.3 V supply with 5 V I/O compatibility and is housed in a 100-pin LQFP package.

Feature Summary

• Hit-less automatic source switchover between Master, Slave, and Stand-by inputs
• Frequency translation supporting spot frequencies from 2 kHz to 311.04 MHz
• Digital Phase Locked Loop (DPLL) architecture for stable jitter performance
• SPI compatible serial interface with IEEE 1149.1 JTAG Boundary Scan support

Applications

• SONET/SDH line cards in AdvancedTCA Network Elements
• SEC and Sync clock group protection switching
• Distribution of timing signals to Advanced Mezzanine Cards (AMCs)

Procurement Notes

Verify the 'T' suffix indicates the lead-free, RoHS and WEEE compliant version as specified in the product brief. Confirm the package type is the 100-pin LQFP. Ensure the application environment meets the -40°C to +85°C operating temperature range. Check that the design accommodates the single 3.3 V digital supply and optional 5 V clamping requirements.

Selection Notes

Select this component for applications requiring hit-less switching of grouped SEC and Sync inputs in SONET/SDH environments. It supports OC-3/STM-1 bit rates and allows independent programming of six output ports. Consider the DPLL bandwidth options (18, 35, or 70 Hz) and damping factors for specific jitter requirements. Ensure the system can provide the necessary 12.800 MHz reference clock input.

Part Context

The ACS8595T complements Semtech SETS devices by extending protection switching functionality to the line card level. It is part of the ACS85xx series designed for AdvancedTCA equipment. The device replaces traditional analog PLL solutions with digital synthesis to ensure consistent performance across manufacturing variations and environmental conditions.

Replacement Considerations

The datasheet notes that the pinout is similar but not identical to the Semtech ACS8525. Verify register set backward compatibility if replacing an ACS8525. No other direct substitute part numbers are listed in the provided documentation.