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sy89546u 2.5v, 3.2gbps differential 4:1 lvds multiplexer with 1:2 fanout and internal termination micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com general description the sy89546u is a precision, high-speed 4:1 differential multiplexer that provides two copies of the selected input. the high speed lvds (350mv) compatible outputs with a guaranteed throughput of up to 3.2gbps over temperature and voltage. the sy89546u differential inputs include micrel?s unique 3-pin internal termination design that allows access to the termination network through a vt pin. this feature allows the device to easily interface to different logic standards, both ac- and dc-coupled without external resistor-bias and termination networks. the re sult is a clean, stub-free, low jitter interface solution. the sy89546u operates from a single 2.5v supply, and is guaranteed over the full industrial temperature range (?40c to +85c). for applications that require a 3.3v supply, consider the sy89547l. or, for applications that only require one differential output, consider the sy89544u or sy89545l. the sy89546u is part of micrel?s precision edge? product family. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? selects among four differential inputs ? provides two copies of the selected input ? guaranteed ac parameters over temp/voltage: ? dc-to>3.2gbps data rat throughput ? <620ps in-to-out t pd ? <150ps t r /t f time ? unique input isolation design minimize crosstalk ? ultra-low jitter design: ? <1ps rms random jitter ? <10ps pp deterministic jitter ? <10ps pp total jitter (clock) ? <0.7ps rms corsstalk-induced jitter ? internal input termination ? unique input termination and vt pin accepts dc- coupled and ac-coupled inputs (lvds, lvpecl, cml) ? 350mv lvds output swing ? power supple 2.5v 5% ? ?40c to +85c temperature range ? availabe in 32-pin (5mmx5mm) mlf? package applications ? sonet/sdh multi-channel select applications ? fibre channel applications ? gige application ___________________________________________________________________________________________________________ typical performance april 2011 m9999-041911-b hbwhelp@micrel.com or (408) 955-1690
micrel, inc. sy89546u april 2011 2 m9999-0041911-b hbwhelp@micrel.com functional block diagram
micrel, inc. sy89546u april 2011 3 m9999-0041911-b hbwhelp@micrel.com ordering information (1) part number package type operating range package marking lead finish SY89546UMI mlf-32 industrial sy89546u sn-pb SY89546UMItr 2) mlf-32 industrial sy89546u sn-pb sy89546umg (3) mlf-32 industrial sy89546u with pb-free bar-line indicator pb_free nipdau sy89546umgtr (2,3) mlf-32 industrial sy89546u with pb-free bar-line indicator pb_free nipdau notes: 1. contact factory for die availability. dice are guaranteed at ta = 25c, dc electricals only. 2. tape and reel. 3. recommended for new designs. pin configuration 32-pin mlf?
micrel, inc. sy89546u april 2011 4 m9999-0041911-b hbwhelp@micrel.com pin description pin number pin name pin function 4, 2, 21, 32, 30, 27, 25, 23, 21 in0, /in0 in1, /in1 in2, /in2 in3, /in3 differential inputs: these inputs pairs are the differential signal inputs to the device. inputs accept ac- or dc-coupled signals as small as 100mv. each pin of a pair internally terminates to a v t pin through 50 ? . note that these inputs will default to an indeterminate state if left open. unused differential input pairs can be terminated by connecting one input to v cc and the complementary input to gnd through a 1k ? resistor. the vt pin is to be left open in this configuration. please refer to the ?input in terface applications? section for more details. 3, 31, 26, 22 vt0, vt1, vt2, vt3 input termination center-tap: each side of the differential input pair, terminates to a v t pin. the v ta0 , v ta1 , v tb0 , v tb1 pins provide a center-tap to a termination network for maximum interface flexibility. see ?input interfac e applications? section for more details. 6, 19 sel0, sel1 these single-ended ttl/cmos-compatible inputs se lect the inputs to the multiplexers. note that these inputs are internally connected to a 25k ? pull-up resistor and will default to a logic high state if left open. input switching threshold is v cc /2. 1, 5, 8, 17, 20, 24, 28, 29 vcc positive power supply: bypass with 0.1 f U 0.01 f low esr capacitors. 10, 11, 14, 15 q0, /q0 q1, /q1 differential outputs: these lvds outputs pairs are the outputs of the device. they are a logic function of the ina0, ina1, inb0, inb1 and sela and selb inputs. please refer to the ?truth table? for details. if an output is not used, it must be terminated with 100 ? across the differential pair. 7, 9, 12, 13, 16, 18 gnd, exposed pad ground: ground pin and exposed pad must be connected to the same ground plane.
micrel, inc. sy89546u april 2011 5 m9999-0041911-b hbwhelp@micrel.com absolute maximum ratings (1) supply voltage (v cc ) ..................................... ?0.5v to +4.0v input voltage (v in ) .................................................................... ?0.5v to v cc termination current (3) source or sink current on vt............................100ma input current source or sink current on vt..............................50ma lead temperature (solderi ng, 20sec.) ..................... +260c storage temperature (t s).........................?65c to +150c operating ratings (2) supply voltage (v cc )............................. 2.375v to 2.625v ambient temperature (t a ) .......................?40c to +85c package thermal resistance (4) mlf? ( ja ) still air, multi- layer pcb .................................35c/w 500lfpm, multi-la yer pcb ................................28c/w mlf? ( ja ) junction-to- board ...........................................20c/w dc electrical characteristics (5) -40c t a +85c, unless stated otherwise. symbol parameter condition min typ max units v cc power supply 2.375 2.5 2.625 v i cc power supply current no load, max. v cc (6) 75 100 ma r diff_in differential input resistance (in-to-/in) 80 100 120 ? r in input resistance (in-to-v t , /in-to-v t ) 40 50 60 ? v ih input high voltage (in, /in) 1.2 v cc v v il input low voltage (in, /in) 0 v ih -0.1 v v in input voltage swing (in, /in) note 7 0.1 v cc v v diff_in differential input voltage swing |in ? /in| note 7 0.2 v in-to -v t note 7 1.8 v notes: 1. permanent device damage may occur if ?abs olute maximum ratings? are exceeded. this is a stress rating only and functional op eration is not implied at conditions other than those deta iled 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 t he device is operated beyond the operating ratings. 3. due to the limited drive capability use for input of the same package only. 4. package thermal resistance assumes exposed pad is soldered (o r equivalent) to the device?s most negative potential (gnd) on the pcb. ja uses 4-layer ja in still-air unless otherwise stated. 5. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been establishe d. 6. includes current through internal 50 ? pull-ups. 7. see ?single-ended and differential swings? section for v in and v diff_in definition.
micrel, inc. sy89546u april 2011 6 m9999-0041911-b hbwhelp@micrel.com lvds outputs dc electrical characteristics (9) v cc = 2.5v 5%; -40c t a +85c, r l = 100 ? across q and /q, unless stated otherwise. symbol parameter condition min typ max units v oh output high voltage (q, /q) see figure 5a v v ol output low voltage (q, /q) see figure 5a 0.925 v v out output voltage swing (q, /q) see figure 1a, 5a 250 350 mv v diff-out differential output voltage swing |q ? /q| see figure 1b 500 700 mv v ocm output common mode voltage (q, /q) see figure 5b 1.125 1.275 v ? v ocm change in common mode voltage (q, /q) see figure 5b ?50 +50 mv lvttl/cmos dc electri cal characteristics (9) v cc = 2.5v 5%, -40c t a +85c, unless stated otherwise. symbol parameter condition min typ max units v ih input high voltage 2.0 v cc v v il input low voltage 0.8 v i ih input high current 40 a i il input low current ?300 a notes: 1. the circuit is the designed to meet t he dc specifications shown in the above t able after thermal equilibrium has been establ ished.
micrel, inc. sy89546u april 2011 7 m9999-0041911-b hbwhelp@micrel.com ac electrical characteristics (10) v cc = 2.5v 5%; -40c t a +85c, r l = 100 ? across q and /q, unless stated otherwise. symbol parameter condition min typ max units nrz data 3.2 gbps f max maximum operating frequency v out 200mv clock 3 4 ghz in-to-q 330 430 530 ps t pd differential propagation delay sel-to-q 200 400 700 ps note 11 4 20 ps note 12 8 20 ps t skew input-to-input skew output-to- output skew part-to-park skew note 13 200 ps note 14 1 ps rms data random jitter (rj) deterministic jitter (dj) note 15 10 ps pp note 16 10 ps pp t jitter clock total jitter (tj) cycle-to-cycle jitter note 17 1 ps rms crosstalk crosstalk-induced jitter note 18 0.7 ps rms t r, t f output rise/fall time (20% to 80%) at full output swing 35 80 150 ps notes: 1. measured with 100mv input swing. see ?timing diagrams? se ction for definition of parameters. high frequency ac parameters ar e guaranteed by design and characterization. 2. input-to-input skew is the difference in time from an input-t o-output in comparison to any other input-to-output. in additio n, the input-to-input skew does not include the output skew. 3. output-to-output skew is measured between two different outputs under identical input transitions. 4. part-to-part skew is defined for two parts with identical pow er supply voltages at the same temperature and with no skew of the edges at the respective inputs. total skew is calculated as the rms (root mean square) of the input skew and output skew. 5. random jitter is measured with a k28.7 comma dete ct character pattern, meas ured at 1.25gbps and 3.2gbps. 6. deterministic jitter is measured at 1.25gbps and 3.2gbps, with both k28.5 and 2 23 ?1 prbs pattern. total jitter definition: with an ideal clock input of frequency f max , no more than one output edge in 10 12 output edges will deviate by more than the specified peak-to-peak jitter value. 7. cycle-to-cycle jitter definition: the vari ation of periods between adjacent cycles, t-t n-1 where t is the time between rising edges of the output cycle. 8. crosstalk is measured at the output while applying two simila r clock frequencies to adjacent inputs that are asynchronous wi th respect to each other at the inputs.
micrel, inc. sy89546u april 2011 8 m9999-0041911-b hbwhelp@micrel.com single-ended and di fferential swings figure 1a . single-ended voltage swing figure 1b . differential voltage swing timing diagram figure 2. timing diagrams
micrel, inc. sy89546u april 2011 9 m9999-0041911-b hbwhelp@micrel.com truth table in0 in1 in2 in3 sel0 sel1 q /q 0 x x x 0 0 0 1 1 x x x 0 0 1 0 x 0 x x 1 0 0 1 x 1 x x 1 0 1 0 x x 0 x 0 1 0 1 x x 1 x 0 1 1 0 x x x 0 1 1 0 1 x x x 1 1 1 1 0
micrel, inc. sy89546u april 2011 10 m9999-0041911-b hbwhelp@micrel.com functional characteristics v cc = 2.5v, gnd = 0v, v in = 100mv, t a = 25c.
micrel, inc. sy89546u april 2011 11 m9999-0041911-b hbwhelp@micrel.com input and output stage internal termination figure 3 . simplified differential input stage
micrel, inc. sy89546u april 2011 12 m9999-0041911-b hbwhelp@micrel.com input interface applications
micrel, inc. sy89546u april 2011 13 m9999-0041911-b hbwhelp@micrel.com output interface applications related micrel products a nd support documentation part number function data sheet link sy89542u 2.5 v, 3.2gbps dual, differential 2:1 lvds multiplexer with internal input termination http://www.micrel.com/_ pdf/hbw/sy89542u.pdf sy89543l 3.3v, 3.2gbps dual, differential 2:1 lvds multiplexer with internal input termination http://www.micrel.com/_pdf/hbw/sy89543l.pdf sy89544u 2.5v, 3.2gbps, differentia l 4:1 lvds multiplexer with internal input termination http://www.micrel.com/_ pdf/hbw/sy89544u.pdf sy89545l 3.3v, 3.2gbps 4:1 lvds multiplexer with internal input termination http://www.micrel.com/_pdf/hbw/sy89545l.pdf sy89547l 3.3v, 3.2gbps, differentia l 4:1 lvds multiplexer with 1:2 fanout and internal input termination http://www.micrel.com /_pdf/hbw/sy89547l.pdf mlf? application note www.amkor.com/products/notes _papers/mlf_appnote_0902.pdf hbw solutions new products and applications www.micrel.com/product-info/products/solutions.shtml
micrel, inc. sy89546u april 2011 14 m9999-0041911-b hbwhelp@micrel.com package information pcb thermal consideration for 32-pin mlf? package (always solder, or equivalent, the exposed pad to the pcb micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com micrel makes no representations or warranties with respect to t he 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 it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether expre ss, 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 an y patent, copyright or other intellectual p roperty right. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in pers onal injury. life support devices or system s 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 significant injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchaser?s own risk a nd purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2010 micrel, incorporated.

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