ACS8514 Datasheet | SEMTECH

ACS8514 SETS Buddy .. Synchronous Equipment Timing Source Partner IC for 2nd T4 DPLL, Accurate Monitoring & Input Extender ADVANCED MS & SENSING Description FINAL Features 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). An alternative use for this DPLL is as an input extender such that the ACS8514 automatically selects one of 14 clock sources, its output then feeds the ACS8530/20 which can also select another 13 sources, giving a total input selection range of 27 sources. An additional 13 sources can be added for each ACS8514 added. An additional highly accurate phase and frequency monitor is also available that can be used to carry out more detailed analysis of standby clock reference sources. This extra monitor is actually another DPLL which under software control could be set to sequentially analyze each input. It can check phase from 0.7º to 23000º and frequency from 0.0003ppm to 80 ppm. An approximate MTIE measurement could be calculated for each reference input as an extra quality check. Simultaneous activity and coarse frequency monitoring of all input sources is performed in the same way as on the ACS8520/30. These can be used to automatically qualify and select sources for the extra T4 path or for input selection for the ACS8520/30 when the ACS8514 is used as an input extender. - Partner to the ACS8520 & ACS8530 for use in SONET Minimum Clock (SMC) or SONET/SDH Equipment Clock (SEC) applications, to provide : designed to Figure 5-21 of Bellcore GR253[17], - One Extra independent T4 path for those systems being - 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...