描述 Description

The ACS8509 is a highly integrated, single-chip solution for the Synchronous Equipment Timing Source (SETS) function in a SONET or SDH Network Element. The device generates SONET or SDH Equipment Clocks (SEC) and Frame Synchronization clocks. The ACS8509 is fully compliant with the required international specifications and standards.

The device supports Free-run, Locked and Holdover modes. It also supports all three types of reference clock source: recovered line clock, PDH network, and node synchronization. The ACS8509 generates independent SEC and BITS/SSU clocks, an 8 kHz Frame Synchronization clock and a 2 kHz Multi-Frame Synchronization clock.

Two ACS8509 devices can be used together in a Master/Slave configuration mode allowing system protection against a single ACS8509 failure.

特性 Features

? Suitable for Stratum 3E*, 3, 4E, 4 and SONET Minimum Clock (SMC) or SONET/SDH Equipment Clock (SEC) applications

? Meets AT&T, ITU-T, ETSI and Telcordia specifications

? Accepts four individual input reference clocks

? Generates six output clocks

? Supports Free-run, Locked and Holdover modes of operation

? Robust input clock source quality monitoring on all inputs

? Automatic “hit-less” source switchover on loss of input

? Phase build-out for output clock phase continuity during input switchover and mode transitions

? Microprocessor interface - Intel, Motorola, Serial, Multiplexed, EPROM

? Programmable wander and jitter tracking attenuation 0.1 Hz to 20 Hz

? Support for Master/Slave device configuration alignment and hot/standby redundancy

? IEEE 1149.1 JTAG Boundary Scan

? Single +3.3 V operation, +5 V I/O compatible

? Operating temperature (ambient) -40°C to +85°C

? Available in 100 pin LQFP package.

? Lead (Pb)-free version available (ACS8509T), RoHS and WEEE compliant.