描述 Description

The ACS8514 is an optional partner integrated circuit for applications using the ACS8520/30. It adds an additional BITS clock (T4 path) DPLL to a clock synchronization system, for applications needing two T4 paths (e.g. to GR-253 figure 5-21).

特性 Features

? Partner to the ACS8520 & ACS8530 for use in SONET Minimum Clock (SMC) or SONET/SDH Equipment Clock (SEC) applications, to provide :

? One Extra independent T4 path for those systems being designed to Figure 5-21 of Bellcore GR253[17],

? An additional DPLL for accurate phase, average phase, frequency and average frequency measuring of any clock source.

? Phase measurement accuracy to 0.7 degrees.

? Frequency measurement accuracy to 3x10-10

? Aids in enhancing Phase Build-out performance to absorb phase disturbances when switching between noisy input sources, via s/w control.

? Provides the facility to have long term frequency measuring and averaging for BOTH the main and any standby clock source so that the holdover frequency is always accurate for both main and standby clock selections.

? Accepts 14 individual input reference clocks, all with robust input clock source quality monitoring.

? Microprocessor interface - Intel, Motorola, Serial, Multiplexed, or boot from EPROM

? IEEE 1149.1[5] JTAG Boundary Scan

? Single 3.3 V operation. 5 V tolerant

? Lead (Pb)-free version available (ACS8514T), RoHS and WEEE compliant