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1 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 description - precision 1:4, 400mv cml fanout buffer - low jitter performance: ? 116fs rms phase jitter (typ) - guaranteed ac performance over temperature/ voltage: ? > 6ghz f max clock ? < 60ps t r /t f times ? < 250ps t pd ? < 15ps max. skew - accepts an input signal as low as 100mv - unique input termination and v t pin accepts dc-coupled and ac-coupled differential inputs: lvpecl, lvds, and cml - 50ohms source terminated cml outputs - power supply 2.5v 5% and 3.3v 10% - industrial temperature range: ?40c to +85c - available in 16-pin (3mm * 3mm) qfn package features 6ghz, 1:4 cml fanout buffer/translator with internal i/o termination precision edge ? sy58020u applications - all sonet and all gige clock distribution - fibre channel clock and data distribution - backplane distribution - data distribution: oc-48, oc-48+fec, xaui - high-end, low skew, multiprocessor synchronous clock distribution rev.: c amendment: /0 issue date: october 2011 the sy58020u is a 2.5v/3.3v precision, high-speed, fully differential 1:4 cml fanout buffer. optimized to provide four identical output copies with less than 15ps of skew and only 116fs rms phase jitter, the sy58020u can process clock signals as fast as 6ghz. the differential input includes micrel?s unique, 3-pin input termination architecture interfaces to differential lvpecl, lvds, and cml signals (ac- or dc-coupled) as small as 100mv without any level-shifting or termination resistor networks in the signal path. for ac-coupled input interface applications, an on-board output reference voltage (v ref - ac ) is provided to bias the v t pin. the outputs are optimized to drive 400mv typical swing into 50ohms loads, with extremely fast rise/fall times guaranteed to be under 60ps. the sy58020u operates from a 2.5v 5% supply or 3.3v 10% supply and is guaranteed over the full industrial temperature range (?40c to +85c). for applications that require lvpecl outputs, consider the sy58021u or sy58022u 1:4 fanout buffer with 800mv and 400mv output swing, respectively. the sy58020u is part of micrel?s high- speed, precision edge ? product line. data sheets and support documentation can be found on micrel?s web site at www.micrel.com. precision edge is a registered trademark of micrel, inc. precision edge ? functional block diagram typical performance in /in q1 /q1 q0 /q0 v t 50 50 v ref-ac q3 /q3 q2 /q2

2 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 package/ordering information pin number pin name pin function 1, 4 in, /in differential input: this input pair receives the signal to be buffered. each pin of this pair internally terminates with 50ohms to the v t pin. note that this input will default to an indeterminate state if left open. see ?input interface applications? section. 2 vt input termination center-tap: each input terminates to this pin. the v t pin provides a center-tap for each input (in, /in) to the termination network for maximum interface flexibility. see ?input interface applications? section. 3 vref-ac reference output voltage: this output biases to v cc ?1.2v. it is used when ac-coupling to differential inputs. connect v ref -ac directly to the v t pin. bypass with 0.01 f low esr capacitor to v cc . see ?input interface applications? section. 8, 13 vcc positive power supply: bypass with 0.1 f//0.01 f low esr capacitors as close to the pins as possible. 5, 16 gnd, ground. exposed pad must be connected to a ground plane that is the same potential exposed pad as the ground pin. 14, 15 /q0, q0, cml differential output pairs: differential buffered output copy of the input signal. the 11, 12 /q1, q1, output swing is typically 400mv into 50ohms load. normally terminate cml output pairs 9, 10 /q2, q2, with 100ohms across q and /q outputs at the receiving end. unused output pairs may be 6, 7 /q3, q3, left floating with no impact on jitter or skew. see ?cml output termination? section. pin description 13 14 15 16 12 11 10 9 1 2 3 4 8 7 6 5 in vt vref-ac /in q1 /q1 q2 /q2 gnd q0 /q0 vcc gnd /q3 q3 vcc 16-pin qfn (qfn-16) ordering information (1) package operating package part number type range marking sy58020umg qfn-16 industrial 020u with pb-free pb-free bar-line indicator sy58020umgtr (2) qfn-16 industrial 020u 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 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (note 1) power supply voltage (v cc ) ....................... ?0.5v to +4.0v input voltage (v in ) ......................................... ?0.5v to v cc cml output voltage (v out ) ........... v cc ?1.0v to v cc +0.5v current (v t ) source or sink current on v t pin........................ 100ma input current source or sink current on in, /in ......................... 50ma current (v ref ) source or sink current on v ref-ac , note 4 ........ 1.5ma operating ratings (note 2) supply voltage (v cc ) ............................ +2.375v to +3.60v operating temperature range (t a ) .......... ?40c to +85c package thermal resistance qfn ( ja ) still-air ............................................................ 60c/w 500lfpm ........................................................... 54c/w qfn ( jb ) (junction-to-board resistance), note 3 ......... 33c/w lead temperature soldering, (20 seconds) ............. 260c storage temperature range (t store ) ... ?65c to +150c t a = ?40c to +85c symbol parameter condition min typ max units v cc power supply voltage v cc = 2.5v 2.375 2.5 2.625 v v cc = 3.3v 3.0 3.3 3.60 v i cc power supply current no load, v cc = max. 150 180 ma (includes internal 50ohms pull-up) v ih input high voltage note 6 v cc ?1.6 v cc v v il input low voltage 0 v ih ?0.1 v v in input voltage swing see figure 1a 0.1 1.7 v v diff_in differential input voltage swing see figure 1b 0.2 3.4 v r in in-to-v t resistance 40 50 60 ohms v ref-ac output reference voltage v cc ?1.3 v cc ?1.2 v cc ?1.1 v v t in in-to-v t voltage 1.28 v dc electrical characteristics (notes 5) v cc = 3.3v 10% or 2.5v 5%; r l = 100y across each output pair or equivalent; t a = ?40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v oh output high voltage v cc ?0.020 v cc ?0.010 v cc v v out output voltage swing see figure 1a 325 400 500 mv v diff_out differential output voltage swing see figure 1b 650 800 1000 mv r out output source impedance 40 50 60 ohms note 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 a bsolute maximum ratings conditions for extended periods may affect device reliability. note 2. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. note 3. thermal performance assumes exposed pad is soldered (or equivalent) to the device?s most negative potential on the pcb. note 4. due to the limited drive capability, use for input of the same package only. note 5. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been established. note 6. v ih (min.) not lower than 1.2v. cml dc electrical characteristics (notes5)
4 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 v cc = 2.5v 5% or 3.3v 10%; t a = ?40c to +85c; r l = 100ohms across each output pair or equivalent, unless otherwise stated. symbol parameter condition min typ max units f max maximum operating frequency v out ? 200mv clock 6 ghz nrz data 10 gbps t pd propagation delay 110 180 260 ps t chan channel-to-channel skew note 7 415ps t skew part-to-part skew note 8 50 ps t jitter rms phase jitter output = 622mhz 116 fs(rms) integration range: 12khz - 20mhz t r , t f output rise/fall time 20% to 80% at full swing 20 40 60 ps note 7. skew is measured between outputs of the same bank under identical transitions. note 8. skew is defined for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the respective inputs. rms phase jitter (random) 12khz to 20mhz = 116fs (typical) offset frequency (hz) phase noise plot: 622mhz @ 3.3v noise power (dbc/hz) ac electircal characteristics phase noise
5 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 timing diagram single-ended and differential swings v in , v out 400mv figure 1a. single-ended voltage swing v diff_in , v diff_out 800mv figure 1b. differential voltage swing /in in /q q t pd
6 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 typical operating characteristics 0 50 100 150 200 250 300 350 400 450 500 0 2000 4000 6000 8000 10000 12000 amplitude (v) frequency (mhz) amplitude vs. frequency 0 1 2 3 4 5 6 7 -60 -40 -20 0 20 40 60 80 100 skew (ps) temperature ( c) skew vs. temperature v cc = 2.5v, gnd = 0, v in = 100mv, t a = 25c, unless otherwise stated. 165 170 175 180 185 190 195 0 200 400 600 800 1000 1200 propagation delay (ps) input voltage swing (mv) propagation delay vs. input voltage swing 176 177 178 179 180 181 182 183 184 -60 -40 -20 0 20 40 60 80 100 propagation delay (ps) temperature ( c) propagation delay vs. temperature
7 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 functional characteristics v cc = 2.5v, gnd = 0, v in = 100mv, t a = 25c, unless otherwise stated. 5ghz output time (25ps/div.) amplitude (100mv/div.) 200mhz output time (600ps/div.) amplitude (100mv/div.)
8 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 input stage gnd v cc /in 50 in v t 50 figure 2. simplified differential input buffer input interface applications lvpecl in /in vt sy58020u v cc r pd v cc v ref-ac nc 0.01 f for v cc = 2.5v, r pd = 19 for v cc = 3.3v, r pd = 50 figure 3d. lvpecl input interface in /in vt sy58020u v cc v cc v cc 0.01 f r pd r pd v ref-ac lvpecl r pd = 100 for a 3.3v system r pd = 50 for a 2.5v system figure 3e. ac-coupled lvpecl input interface cml in /in vt nc sy58020u v cc v cc v ref-ac nc (option: may connect v t to v cc ) figure 3a. dc-coupled cml input interface cml in /in vt 0.01 f sy58020u v cc v cc v cc v ref-ac figure 3b. ac-coupled cml input interface lvds in /in vt nc sy58020u v cc v cc v ref-ac nc figure 3c. lvds input interface
9 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 part number function data sheet link sy58020u 6ghz, 1:4 cml fanout buffer/translator http://www.micrel.com/product-info/products/sy58020u.shtml with internal i/o termination sy58021u 4ghz, 1:4 lvpecl fanout buffer/translator http://www.micrel.com/product-info/products/sy58021u.shtml with internal termination sy58022u 5.5ghz, 1:4 fanout buffer/translator w/400mv http://www.micrel.com/product-info/products/sy58022u.shtml lvpecl outputs and internal input termination 16-mlf? manufacturing guidelines www.amkor.com/products/notes_papers/mlf_appnote_0902.pdf exposed pad application note m-0317 hbw solutions http://www.micrel.com/product-info/as/solutions.shtml related micrel products and support documentation cml output termination figures 4 and 5 illustrate how to terminate a cml output using both the ac-coupled and dc-coupled configuration. all outputs of the sy58020u are 50y with a 16ma current source. gnd v cc q /q 50 50 100 16ma figure 4. cml dc-coupled
figure 5. cml ac-coupled termination
10 precision edge ? sy58020u micrel, inc. m9999-102811 hbwhelp@micrel.com or (408) 955-1690 16 lead qfn (qfn-16) package ep- exposed pad die compside island heat dissipation heavy copper plane heavy copper plane v ee v ee heat dissipation pcb thermal consideration for 16-pin qfn package (always solder, or equivalent, the exposed pad to the pcb) package notes: note 1. package meets level 2 qualification. note 2. all parts are dry-packaged before shipment. note 3. exposed pads must be soldered to a ground for proper thermal management. micrel, inc. 2180 fortune drive san jose, ca 95131 us a tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual p roperty right micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are in tended 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 si gnificant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s 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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