1 precision edge ? sy58031u micrel, inc. m9999-073010 hbwhelp@micrel.com or (408) 955-1690 description precision 1:8, 400mv cml fanout buffer low-jitter performance: ? 75fs rms phase jitter (typ) guaranteed ac performance over temperature and voltage: ? clock frequency range: dc to >6ghz ? <60ps t r / t f time ? <270ps t pd ? <20ps ouput-to-output skew 50 source-terminated cml outputs 400mv cml output swing into 50 load fully differential i/o accepts an input signal as low as 100mv unique, patent-pending input termination and vt pin accepts dc-coupled and ac-coupled differential inputs: (lvpecl, lvds, and cml) power supply 2.5v 5% or 3.3v 10% industrial temperature range: C40c to +85c available in 32-pin (5mm x 5mm) qfn package features ultra-precision 1:8 cml fanout buffer with internal i/o terminatio n precision edge ? sy58031u applications all sonet and all gige clock distribution all fibre channel clock and data distribution network routing engine timing distribution high-end, low-skew multiprocessor synchronous clock distribution rev.: f amendment: /0 issue date: october 2011 the sy58031u is a 2.5v/3.3v precision, high-speed, fully differential cml 1:8 fanout buffer. the sy58031u is optimized to provide eight identical output copies with less than 20ps of skew and only 75fs rms phase jitter. it can process clock signals as fast as 6ghz. the differential input includes micrels unique, 3-pin input termination architecture that allows the sy58031u to directly interface to cml, lvpecl, and lvds differential signals (ac- or dc-coupled) without any level-shifting or termination resistor networks in the signal path. the result is a clean, stub-free, low-jitter interface solution. the cml outputs feature 400mv typical swing into 50 loads and provide an extremely fast rise/fall time guaranteed to be less than 60ps. the sy58031u operates from a 2.5v 5% supply or 3.3v 10% supply and is guaranteed over the full industrial temperature range (C40c to +85c). for applications that require high-speed 1:8 lvpecl fanout buffers, consider the sy58032u and sy58033u. the sy58031u is part of micrels high-speed, precision edge ? product line. all support documentation can be found on micrels web site at www.micrel.com. functional block diagram precision edge is a registered trademark of micrel, inc. precision edge ?
2 precision edge ? sy58031u micrel, inc m9999-073010 hbwhelp@micrel.com or (408) 955-1690 pin number pin name pin function 3, 6 in, /in differential signal input: each pin of this pair internally terminates with 50 to the vt pin. note that this input will default to an indeterminate state if left open. see input interface applications section. 4 vt input termination center-tap: each input terminates to this pin. the vt pin provides a center-tap for each input (in, /in) to the termination network for maximum interface fexibility. see input interface applications section. 2, 7, 17, 24 gnd, ground. exposed pad must be connected to a ground plane that is the same potential exposed pad as the ground pin. 1, 8, 9, 16 vcc positive power supply: bypass with 0.1f||0.01f low esr capacitors as close to the 18, 23, 25, 32 pins as possible. 31, 30, 29, 28, 27, q0, /q0, q1, /q1, cml differential output pairs: differential buffered output copy of the input 26, 22, 21, 20, 19, q2, /q2, q3, /q3, signal. the cml output swing is typically 400mv into 50. unused output pairs may be 15, 14, 13, 12, q4, /q4, q5, /q5, left foating with no impact on jitter. see cml output termination section. 11, 10 q6, /q6, q7, /q7 5 vref-ac bias reference voltage: equal to v cc C1.2v (typical), and used for ac-coupled applications. see input interface applications section. when using v ref-ac , bypass with 0.01f capacitor to v cc . maximum sink/source current is 0.5ma. pin description pac k age/ordering information ordering information (1) package operating package part number type range marking sy58031umg (3) qfn-32 industiral sy58031u with pb-free pb-free bar-line indicator sy58031umgtr (2, 3) qfn-32 industrial sy58031u with pb-free pb-free bar-line indicator notes: 1. contact factory for die availability. dice are guaranteed at t a = 25c, dc electricals only. all devices are pb-free. 2. tape and reel. 3. pb-free package recommended for new designs. 32-pin qfn (qfn-32)
3 precision edge ? sy58031u micrel, inc. m9999-073010 hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) power supply voltage (v cc ) ....................... C0.5v to +4.0v input voltage (v in ) ........................................... C0.5v to v cc current (v t ) source or sink current on v t pin ......................... 100ma input current (v t ) source or sink current on in, /in .......................... 50ma current (v ref ) source or sink current on v ref-ac (3) ................... 1.5ma lead temperature soldering, (20 sec.) ..................... 260c storage temperature range (t s ) ............ C65c to +150c operating ratings (2) power supply voltage (v cc ) ................. +2.375v to +3.60v ambient temperature range (t a ) .............. C40c to +85c package thermal resistance (4) qfn ( ja ) still-air ............................................................. 35c/w qfn ( jb ) junction-to-board ............................................ 20c/w symbol parameter condition min typ max units v cc power supply voltage 2.5v nominal 2.375 2.5 2.625 v 3.3v nominal 3.0 3.3 3.6 v i cc power supply current v cc = max. no lead. includes current 265 330 ma through 50 pull-ups. v ih input high voltage in1, /in1, note 6 v cc C1.6 v cc v v il input low voltage in1, /in1 0 v ih C0.1 v v in input voltage swing in1, /in1, see figure 1a. 0.1 1.7 v v diff_in differential input voltage swing in1, /in1, see figure 1b. 0.2 v |in0, /in0|, |in1, /in1| r in in-to-v t resistance 40 50 60 v t in max. in-to-v t (in, /in) 1.28 v v ref-ac v cc C1.3 v cc C1.2 v cc C1.1 v dc electrical characteristics (5) t a = C40c to +85c v cc = 2.5v 5% or 3.3v 10%; r l = 100 across q and /q; t a = C40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v oh output high voltage v cc C0.020 v cc v v out output voltage swing see figure 1a. 325 400 mv v diff_out differential voltage swing see figure 1b. 650 800 mv r out output source impedance 40 50 60 notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ratings conditions for extended periods may affect device reliability. 2. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. due to the limited drive capability, use for input of the same package only. 4. thermal performance assumes exposed pad is soldered (or equivalent) to the device s most negative potential (gnd) on the pcb. jb uses 4-layer ja in still-air number unless otherwise stated. 5. the circuit is designed to meet the dc specifcations shown in the above tables after thermal equilibrium has been established. 6. v ih (min) not lower tha 1.2v. cml dc e lectrical characteristics (5)
4 precision edge ? sy58031u micrel, inc m9999-073010 hbwhelp@micrel.com or (408) 955-1690 v cc = 2.5v 5% or 3.3v 10%; r l = 100 across each output pair or equivalent; t a = C40c to +85c, unless otherwise stated. symbol parameter condition min typ max units f max maximum operating frequency v out 200mv clock 6 ghz t pd propagation delay (in-to-q) 120 230 270 ps t pd tempco differential propagation delay 35 fs/c temperature coeffcient t skew output-to-output (within device) note 8 7 20 ps part-to-part note 9 100 ps t jitter rms phase jitter output: 622mhz integration range: 12khz - 20mhz 75 fs t r , t f output rise/fall time 20% to 80%, at full output swing 20 45 60 ps notes: 7. high frequency ac electricals are guaranteed by design and characterization. all outputs loaded, v in 100mv. 8. output-to-output skew is measured between outputs under identical transitions. 9. part-to-part skew is defned for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the respective inputs. part-to-part skew includes variation in t pd . ac electrical characteristics (7) phase noise phase noise plot: 622mhz @ 3.3v rms phase jitter (random) 12khz to 20mhz: 75fs (typical)
5 precision edge ? sy58031u micrel, inc m9999-073010 hbwhelp@micrel.com or (408) 955-1690 single-ended and differential swings figure 1a. single-ended voltage swing figure 1b. differential voltage swing timing diagram
6 precision edge ? sy58031u micrel, inc. m9999-073010 hbwhelp@micrel.com or (408) 955-1690 typical operating characteristics v cc = 2.5v, gnd = 0, v in = 100mv, t a = 25c, unless otherwise stated.
7 precision edge ? sy58031u micrel, inc m9999-073010 hbwhelp@micrel.com or (408) 955-1690 input interface applications figure 3d. ac-coupled lvpecl input interface figure 3e. lvds input interface figure 3a. dc-coupled cml input interface option: may connect v t to v cc . figure 3c. lvpecl input interface figure 3b. ac-coupled cml input interface figure 2. simplifed differential input buffer input buffer
8 precision edge ? sy58031u micrel, inc. m9999-073010 hbwhelp@micrel.com or (408) 955-1690 cml o utput t ermination figure 4 and figure 5 illustrate how to terminate a cml output using both the ac- and dc-coupled confguration. all outputs of the sy58031u are 50 with a 16ma current source. figure 4. cml dc-coupled termination figure 5. cml ac-coupled termination part number function data sheet link sy58031u ultra-precision 1:8 cml fanout buffer with http://www.micrel.com/product-info/products/sy58031u.shtml internal i/o termination sy58032u ultra-precision 1:8 lvpecl fanout buffer with http://www.micrel.com/product-info/products/sy58032u.shtml internal termination sy58033u ultra-precision 1:8 400mv fanout buffer with http://www.micrel.com/product-info/products/sy58033u.shtml internal termination 32-mlf ? manufacturing guidelines exposed pad www.amkor.com/products/notes_papers mlf_appnote.pdf application note hbw solutions http://www.micrel.com/product-info/as/solutions.shtml related m icrel products and support documentation
9 precision edge ? sy58031u micrel, inc m9999-073010 hbwhelp@micrel.com or (408) 955-1690 32-pin qfn (qfn-32) pcb thermal consideration for 32-pin qfn package (always solder, or equivalent, the exposed pad to the pcb) package notes: 1. package meets level 2 qualifcation. 2. all parts are dry-packaged before shipment. 3. exposed pads must be soldered to a ground for proper thermal management. micrel, inc. 2180 fortune drive san jose, ca 95131 usa t e l + 1 (408) 944-0800 f a x + 1 (408) 474-1000 w e b http://www.micrel.com the information furnished by micrel in this data sheet is believed to be accurate and reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifcations at any time without notifcation to the customer . micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signifcant injury to the user . a purchasers use or sale of micrel products for use in life support appliances, devices or systems is at purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2005 micrel, incorporated.
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