advanced comms product group product brief topsync ? acs9520tpb_us, revision 01, 2nd november 2012 ?2012 semtech corp. www.semtech.com page 1 acs9520t this is the product brief for the topsync ? assp acs9520t. the datasheet should be read in conjunction with the acs9520t user guide, api documentation and other information available at the topsync ? resource center. there are many applications in which it is necessary to lock a remote clock signal to a central frequency source, and there are other applications which re quire the alignment of a clock to a central source of time. the acs9520t combines semtech's synchronous equipment timing source (sets) functionality and topsync ? technology and can therefore be used for both applications. in this datasheet, the words sets and tdm block are synonymous, and both terms are used. sets functionality is used for frequency-locking applications in sdh/sonet and ethernet equipment. topsync ? technology combines the ieee 1588 v2 prot ocol with semtech's patented packet delay filtering algorithms, which allow a reference clock to be transported across a packet switched network without special adaptations of switches or routers in the network. it is ideal for carrying timing across a legacy packet switched network. ieee 1588 is often known as precision time protocol (ptp), the acronym that is generally used in this document. the acs9520t supports: timebase derived from: ptp slave, sonet/sdh recovered clock, bits/ssu input, synce recovered clock, gps, 1pps, precision holdover. physical layer clock sources are jitter and wander attenuated according to g.813, g.823, gr1244, gr253, g.8261, g.8262(draft) etc. technology bridging: derive timing from one input technology (sonet, sdh, synce, ptp) and provide timing to all output technologies simultaneously. ptp grandmaster: ptp grandmaster functions provided based on the timebase including support for utc, tai, gps time epochs. ptp slave: multi-hop locking (ordinary clock) or interworking with boundary clocks or transparent clocks with sophisticated packet delay filters and adaptation algorithms. tdm/clocks: includes all semtech sets fa mily functions for physical layer input and output synchronization. synce: integrates semtech esets technology for the physical layer input and output synchronization of ethernet phy devices. self test - in which the device self-checks for consistency, checks the external sdram for faults, and performs rudimentary checks of the external ethernet phys. ptp timing features ? ptp grandmaster selection - automatic or manual ptp master/slave mode selection. ? powerful network delay analysis - full time-alignment in the slave over hostile networks (layer 2 or layer 3 networks). ? dynamic adaptation - to network delay variations. network loading change tolerant (e.g., ramps and steps). ? time alignment - better than 1 s on a managed 10-switch gbe network under g.8261 test conditions.* ? frequency alignment - better than 10 ppb on a managed 5-switch gbe network under g.8261 test conditions.* tdm timing features ? programmable tdm timing bandwidth - for wander and jitter tracking/attenuation, 0.1 hz to 70 hz in 10 steps. ? automatic hit-less source switchover - on loss of input. ? output clock phase adjustment - in 6 ps steps to 200 ns. device features ? fully integrated - integrates hardware precision timestamping with on-the-fly in sertion. powerful integrated processor and clock recovery algorithm. ? ecc - provision for optional ecc memory. ? ultra low noise clock generation - interface to the semtech sx1790 ultra low noise frequency synthesizer. ? timing synchronization on a chip - supporting transitions from legacy circuit networks to new packet technology. ? suitable applications - stratum 3, 3e, 4e, 4, sonet minimum clock (smc) or so net/sdh equipment clock (sec) or ethernet, ieee1588 ptp and synchronous ethernet. ? clocks - 9 clock inputs and 5 clock outputs. ? precision holdover - in all modes. ? ports - 2 x sgmii, sdram, serial interface and jtag. ? time-of-day - ppns top-of-second signal plus current-time-since-epoch message on a uart. ? output characteristics: time-aligned output pair: 1 pps and 125 mhz divided by n (n = 4 to 125000). frequency-aligned outputs: 1 hz and programmable frequency 1 khz to 180 mhz. low jitter frequency-aligned outputs: sonet and sdh oc-n rates: 3.84 mhz to 155.52 mhz. synce rates: 25 mhz, 50 mhz, 62.5 mhz and 125 mhz ? local oscillator : 20 ppm or better. ? bga package : 256 pin, 14 mm x 14 mm. lead-free - rohs and weee compliant. a simplified system diagram is shown in figure 1 . * this is an indication of semtech tested performance and is not guaranteed across all types of sw itches and network conditions. please contact semtech topsync ? support for further details. about the topsync ? acs9520t features
acs9520tpb_us, revision 01, 2nd november 2012 ?2012 semtech corp. topsync ? www.semtech.com page 2 acs9520t advanced comms product group product brief figure 1 simplified system diagram - acs9520t topsync ? in ptp grandmaster and slave modes system diagram
acs9520tpb_us, revision 01, 2nd november 2012 ?2012 semtech corp. topsync ? www.semtech.com page 3 acs9520t advanced comms product group product brief figure 2 bga package, 1 mm pitch, 14 mm x 14 mm, 256 balls the acs9520t is rated for full temperature range when this package is used with a pcb of four layers or more. copper coverage must exceed 50%. a ll balls must be soldered to the pcb. maximum operating temperature must be reduced when the acs9520t is used with a pcb that does not meet these requirements. thermal conditions pin 1 index (laser mark 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 d e t r p n m l k j h g f e d c b a d1 e1 see detail b see detail a b a a a2 a1 aaa c c seating plane a1 corner a a1 a2 b d d1 e e1 e f m n aaa bbb ccc min --- 0.25 1.01 0.35 13.90 13.90 --- --- --- --- nom --- 0.30 1.06 0.40 14.00 14.00 1.00 --- --- --- max 1.46 0.35 1.11 0.45 14.10 14.10 --- 0.10 0.20 0.10 12.00 bsc 12.00 bsc 16 256 dimensions millimeters dim 0.80 bsc notes 1 controlling dimensions are in mm (angles in degrees). 2 m represents the basic solder ball matrix size and n is the number of attached solder balls. detail a scale: 2/1 detail b scale: 2/1 f f e bbb m c ccc m c bxn ab
advanced comms product group product brief topsync ? semtech corporation advanced communications product group e-mail: sales@semtech.comacsupport@semtech.cominternet: http://www.semtech.com usa 200 flynn road, camarillo, ca 93012-8790. tel: +1 805 498 2111 fax: +1 805 498 3804 far east 12f, no. 89 sec. 5, nanking e. road, taipei, 105, twn, r.o.c. tel: +886 2 2748 3380 fax: +886 2 2748 3390 europe semtech ltd., units 2 & 3, park court, premier way, abbey park industrial estate, romsey, hampshire, so51 9dn. tel: +44 (0)1794 527 600 fax: +44 (0)1794 527 601 acs9520tpb_us, revision 01, 2nd november 2012 ?2012 semtech corp. www.semtech.com page 4 acs9520t disclaimers life support - this product is not designed or inte nded for use in life support equipment, devices or systems, or other critical applications, and is not authorized or warranted for such use. right to change - changes may be made to this product without notice. cu stomers are advised to obtain the latest version of the relevant information before placing orders. compliance to relevant standards - operation of this device is subject to the user ?s implementation and design practices. it is the responsibility of users to ensure that equipment using this device is compliant to all relevant standards. contact information for se mtech international ag
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