ACS8527 Datasheet | SEMTECH

Line Card Protection Switch for PDH, SONET or SDH Systems ADVANCED MUNICATIONS .. Description FINAL Features ACS8527 MUXPLL The ACS8527 is a highly integrated, single-chip, MUX with PLL solution for protection switching between two SECs (SDH/SONET Equipment Clocks) from Master and Slave SETS (Synchronous Equipment Timing Source) clock cards, for line cards in a PDH, SONET or SDH Network Element. The ACS8527 has fast activity monitors on the inputs and will raise a flag on a pin if there is a loss of activity on the currently selected input. The protection switching between the input reference clock sources is controlled by an external pin. The ACS8527 has two SEC reference clock input ports, configured for expected frequency by setting hardware pins. The ACS8527 can perform frequency translation, converting, for example, an 8 k Hz SEC input clock from a backplane into a 155.52 MHz clock for local line cards. The ACS8527 generates two independent SEC clock outputs, one on a LVDS port and one on a TTL/CMOS port, at spot frequencies configured by hardware pins. The spot frequencies range from 1.544 MHz up to 155.52 MHz. The ACS8527 also provides an 8 k Hz Frame Sync output and 2 k Hz Multi-Frame Sync output. ‹ Line card protection switch - partners Semtech SETS devices for Stratum 3E/3/4E/4 PDH, SONET or SDH applications ‹ High performance DPLL/APLL solution ‹ Output jitter pliant to STM-1 ‹ Two independent SEC inputs ports (TTL) ‹ Four independent output ports: Two clock ports: one LVDS, one TTL ‹ Two Syncs (TTL): 8 k Hz Fr Sync & 2 KHz MFr Sync ‹ I/O frequencies configurable via hardware pins: ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Block Diagram Figure 1 Block Diagram of the ACS8527 MUXPLL IP_FREQ SONSDHB SRCSW 2 x SEC TTL inputs SEC1 SEC Inputs: Input Frequencies 8k Hz 1.544 MHz SEC2 2.048 MHz 6.48 MHz 19.44 MHz 25.92 MHz 38.88 MHz 51.84 MHz TCK 77.76 MHz TDI TMS TRST TDO Input SEC Port Selector TTL I/O ports: spot frequencies 1.544 MHz to 77.76 MHz...