_________________________________________________________ maxim integrated products 1 some revisions of this device may incorporate deviations from published specifications known as errata . multiple revisions of any device may be simultaneously available through various sales channels. for information about device errata, go to: www.maxim - ic.com/errata . for pricing, delivery, and ordering info rmation, please contact maxim direct at 1 - 888- 629- 4642, or visit maxim?s website at www.maxim - ic.com. abridged data sheet max 24188 low - cost ieee 1588 clock general description the MAX24188 is a flexible , low - cost ieee 1588 clock designed to be the central 1 588 time base in a multiport system. in such systems (typically boundary clocks or transp arent clocks) timestampers at the ports must all have a common time and frequency reference. the MAX24188 serves as that common reference. as the system exchanges 1588 packets with an external 1588 master and calculates its time offset vs. the master, the MAX24188 can be adjusted by system software to zero out the time offset and thereby achieve time and frequency synchronization with the master. as the MAX24188 is adjusted, its output frequency and time alignment signals are correspondingly adjusted. all t imestampers (and other time - aware components) that receive those signals then follow the adjustment to maintain synchronization with the MAX24188. in this way all 1588 elements in the system maintain a common sense of time and frequency. the MAX24188 can b e a standalone central timing function for 1588 systems. it can also be used in conjunction with one of maxim?s clock synchronization ics in multimode systems designed to be clocked by 1588, 1588 plus frequency (such as synchronous ethernet ) , or frequency only. applications central time - clock for 1588- enabled equipment with timestamping on multiple ports wireless base s tations and controllers switches, routers, dslams, pon equipment pseudowire circuit emulation equipment test and measurement systems medica l, industrial , and factory automation equipment ordering information part temp range pin - package max241 88etk+ -40 c to +85 c 68 tqfn - ep* + denotes a lead - free/rohs - compliant package. *ep = exposed pad. spi is a trademark of motorola, inc . hig hlighted features ? complete hardware support for ieee 1588 ? flexible block for any 1588 architecture ? enables ordinary , boundary , and transparent clocks ? steered by software to follow an external 1588 m aster ? 2 - 8 ns time resolution and 2 - 32 ns period resolution ? 1 ns input t imestamp accuracy and output edge placement accuracy ? three time/frequency controls: direct time write, time adjustment, and high - resolution frequency adjustment ? programmable c l ock and time - alignment i/o to synchronize all 1588 elements in the system ? can p rovide an output clock s ignal to slave components (125mhz / n , 1 n 255) ? ca n provide an output time alignment signal to slave components (e.g. , 1 pps) ? can frequency - lock to an input clock signal from elsewhere in the s ystem ? can t imestamp an input ti me alignment signal to time - lock to a master elsewhere in the s ystem (e.g. , 1 pps ) ? input event timestamper detects incoming time alignment (e.g. , 1 pps ) or clock edges , can timestamp rising and/or falling edges ? flexible programmable event ge nerator ( peg) can output 1 pps (one pulse per period) or a w i de variety of clock s ignals ? built - in support for telecom equipment timing architecture s with dual redundant timing cards ? full support to enable switches and routers to be transparent clocks and/ or boun dary clocks ? full support for 1588 and synchronous ethernet ? operates from a 10 mhz , 12.8 mhz , 25 mhz , or 125mhz r ef erence c lock ? spi? processor interface ? 1.2v operation with 3.3v i/o 19 - 6003 ; rev 0; 8 /11
MAX24188 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no cir cuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. m axim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408 - 737 - 7600 2 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products . abridged data sheet application examples example 1: multiport system with central 1588 softwar e central switching function MAX24188 1588 clock processor 1588 sw 1588 time alignment, e.g . 1 pps clock sync function system clock e.g. 25mhz line card 1 ethernet ports ethernet ports ts ts line card n ts ts example: max24288 example: ds31400. optional. can provide holdover, clock selection and frequency translation. optional: 1pps from gps receiver example 2: multiport system with distributed 1588 software central switching function MAX24188 1588 clock processor 1588 sw 1588 time alignment, e.g. 1 pps clock sync function system clock e.g. 25mhz line card 1 ethernet ports ethernet ports ts ts line card n ts ts up 1588 sw up 1588 sw example: max24288 example: ds31400. optional. can provide holdover, clock selection and frequency translation. optional: 1pps from gps receiver block diagram 1588 time engine ts3 time stamper time peg1 prog. event generator control and status jtag gpio control reference clock pll refclk 125mhz jtclk jtms jtdi jtdo rst_n gpio1 gpio2 gpio3 gpo1 gpo2 sclk sdi sdo cs_n MAX24188 peg2 prog. event generator gpio4 gpio5 gpio6 gpio7 output clock generator 125mhz, 8 phases ts2 time stamper ts1 time stamper jtrst_n note to readers: this document is an abridged version of the full data sheet. to request the full data sheet, go to www.maxim - ic.com/MAX24188 and click on request full data sheet .
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