ACS8595 Datasheet | SEMTECH

Line Card Protection Switch for SONET/SDH Advanced TCA Systems ADVANCED MUNICATIONS .. Description FINAL Features PRODUCT BRIEF ACS8595 ATCA The ACS8595 ATCA is a highly integrated, single-chip solution for “Hit-less” protection switching of SEC (SDH/SONET Equipment Clock) + Sync clock “Groups”, from Master and Slave SETS clock cards and a third (Stand-by) source, for line cards/blades in a SONET or SDH ATCA (Advanced Telemuncications puting Architecture) Network Element. The ACS8595 has fast activity monitors on the SEC clock inputs and will implement automatic system protection switching against the Master clock failure. The selection of the Master/Slave input can be forced by a Force Fast Switch pin. If both the Master and Slave input clocks fail, the Stand-by “Group” is selected or, if no Stand-by is available, the device enters Digital Holdover mode. The ACS8595 can perform frequency translation, converting, for example, an 8 k Hz SEC input clock from the ATCA backplane into a range of spot frequencies from 2 k Hz up to 311.04 MHz (up to 77.76 MHz on the TTL/CMOS ports). The output frequency is independently programmable on each of the six SEC output ports, so the ACS8595 ATCA has the potential to supply simultanously up to six different SEC frequencies, for example, to meet the individual requirements of several Advanced Mezzanine Cards (AMCs). The ACS8595 has one PECL/LVDS output port and five TTL/CMOS ports. It also provides an 8 k Hz Frame Sync and a 2 k Hz Multi-Frame Sync TTL/CMOS signal output with programmable pulse width and polarity. The ACS8595 includes a Serial Port, which can be SPI patible, providing access to the configuration and status registers for device setup. Block Diagram Figure 1 Block Diagram of the ACS8595 ATCA 3 x SEC/Sync Input Groups SEC1 & SEC2: TTL/PECL/LVDS, SEC3 and all Syncs TTL only SEC1 Master SYNC1 SEC2 Slave SYNC2 SEC3 Stand-by SYNC3 SEC Inputs: Programmable Frequencies 2 k Hz, 4 k Hz, TCK N x 8 k...