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sy55859l 3.3v, 3.2gbps dual 2x2 crosspoint switch superlite is a trademark of micrel, inc . micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com january 2010 m99 99 - 0121 10 -a hbw help@micrel.com or (408) 955 - 1690 general description the sy55859l is a dual cml 2x2 crosspoint switch optimized for high - speed data and/or clock applications (up to 3.2gbps or 2.7ghz) where low jitter and skew are critical. this device is pin - for - pin, plug - in compatible to the max3840. each 2x2 of the sy55859l routes any input to any output, and thus can distribute or multiplex a clock or data stream. the i/o architecture is fully differential and cml compatible. both inputs and outputs are optimized for 50? transmission lines. the in puts (da 0 - 1 and db 0 - 1) are internally terminated with 50?, thus eliminating external termination, and the outputs (qa0 - 1 and qb0 - 1) include 50? source termination. furthermore, a power - saving output enable feature is provided which powers - down unused o utputs. the sy5859l operates from a +3.3v 10% supply, and is guaranteed over the industrial ( C 40c to +85c) temperature range. it is available in a 32 - pin (5mm x 5mm) qfn package. for applications that require either lower voltage operation or a more fl exible input interface (for applications such as ac C coupled lvpecl inputs), consider the sy55858u. data sheets and support documentation can be found on micrels web site at : www.micrel.com. superlite tm features ? pin - for - pin, plug - in compatible to the ma x3840 ? supply voltage operation: +3.3v10% ? low jitter: - 2ps rms random jitter - 5ps pp deterministic jitter ? power saving output disable feature ? 15ps channel - to - channel skew ? fast cml outputs: <100ps t r /t f ? available in a small (5mm x 5mm) 32 - pin epad - qfn package applications ? sonet/sdh optical transport ? high - speed backplane redundancy ? add - drop multiplexers ___________________________________________________________________________________________________________ typical applications typical performance downloaded from: http:///
micrel , inc. sy55859l january 2010 2 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead finish sy55859lmi h32 -1 industrial sy55859lmi sn-pb sy55859lmitr (2) h32 -1 industrial sy55859lmi sn-pb SY55859LMG (3) h32 -1 industrial SY55859LMG with pb- free bar - line indicator pb-free nipdau SY55859LMGtr (2,3) h32 -1 industrial SY55859LMG with pb - free bar - line indicator pb-free nipdau note s: 1. contact factory for die availability. dice are guaranteed at t a = 25 c, dc electricals only. 2. tape and reel. 3. pb - free package recommended for new designs. cross reference table micrel semiconductor maxim sy55859lmi max3840egj pin configuration 32 - pin epad - qfn downloaded from: http:///
micrel , inc. sy55859l january 2010 3 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 pin description pin number pin name pin function 1 enb1 ttl input. channel b1 output enable. setting this pin inactive low powers down qb1 and /qb1. do not leave floating. 2 db1 cml input. channel b1 true input. 3 /db1 cml input. channel b1 complement input. 4 enb0 ttl input. channel b0 output enable. setting this pin inactive low powers down qb0 and /qb. do not leave floating. 5 selb0 ttl input. channel b0 output select. please refer to table 2. do not leave floating. 6 db0 cml input. channel b0 true input. 7 /db0 cml input. channel b0 complement input. 8 selb1 ttl input. channel b1 output select. please refer to table 2. do not leave floating. 9, 24 gnd supply ground. most negative supply voltage. 10, 13, 16, 17, 20, 23 vcc positive supply. 11 /qb0 cml output. channel b0 complement output. 12 qb0 cml output. channel b0 true outp ut. 14 /qb1 cml output. channel b1 complement output. 15 qb1 cml output. channel b1 true output. 18 /qa1 cml output. channel a1 complement output. 19 qa1 cml output. channel a1 true output. 21 /qa0 cml output. channel a0 complement output. 22 qa0 cml output. channel a0 true output. 25 sela1 ttl input. channel a1 output select. please refer to table 1. do not leave floating. 26 da0 cml input. channel a0 true input. 27 /da0 cml input. channel a0 complement input. 28 sela0 ttl input. channel a0 output select. please refer to table 1. do not leave floating. 29 ena0 ttl input. channel a0 output enable. setting this pin inactive low powers down qa0 and /qa0. do not leave floating. 30 da1 cml input. channel a1 true input. 31 /da1 cml input. channel a1 complement input. 32 ena1 ttl input. channel a1 output enable. setting this pin inactive low powers down qa1 and / qa1. do not leave floating. ep exposed pad ground. this must be soldered to circuit board ground for proper electrical and thermal operatio n. downloaded from: http:///
micrel , inc. sy55859l january 2010 4 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) supply voltage (v cc ) ..................................... - 0.5v to +6.0v cml input voltage (v in ). ............................... - 0.5v to +6.0v ttl control input voltage (v in ). ............. - 0.5v to v cc +0.5v cml output voltage (v out ) ............. v cc - 1.0v to v cc +0.5v cml output current (i out ) .......................................... 22ma lead temperature (soldering, 20sec.) ..................... +260c storage temperature (t s ) ......................... C 65 c to + 150 c operating ratings (2) supply voltage (v cc ) .................................. + 3.0 to + 3.6 v ambient temperature (t a ) ..................... C 40 c to + 85 c junction temperature (t j ) .................................... 160c package thermal resistance qfn ( ja ) still -air....28c/w 500lfpm..20c/w qfn ( jc )4c/w dc electrical characteristics t a = C 40c to +85c . symbol parameter condition min typ max units v cc power supply voltage 3.0 3.3 3.6 v i cc power supply cur rent no load, over supply voltage; all outputs enabled 160 190 ma cml dc electrical characteristics v cc = 3.0v to 3.6v; gnd = 0v; t a = C 40c to +85c (note 3 ) symbol parameter condition min typ max units v out cml differential output swing r l = 50 ? to v cc , figure 3 640 800 1000 mv pp r out differential output impedance figure 2 85 100 115 ? v ocm cml output common mode voltage r l = 50 ? to v cc , figure 3 v cc - 0.2 v v is cml input voltage range figure 4 v cc - 0.8 v cc +0.4 v v diff cml differential input volt age swing figure 5 300 1600 mv pp cml single - ended input impedance figure 1 42.5 50 57.5 ? ttl control electrical characteristics v cc = 3.0v to 3.6v; gnd = 0v; t a = C 40c to +85c (note 3 ) symbol parameter condition min typ max units v ih ttl input high voltage 2.0 v v il ttl input low voltage 0.8 v i ih ttl input high current - 10 +10 a i il ttl input low current - 10 +10 a notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a str ess 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 rating c onditions for extended periods may affect reliability. 2. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. the device is guaranteed to meet the dc specifications, shown in the table above, after ther mal equilibrium has been established. the device is tested in a socket such that transverse airflow of 500lfpm is maintained. downloaded from: http:///
micrel , inc. sy55859l january 2010 5 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 ac electrical characteristics v cc = 3.0v to 3.6v; gnd = 0v; t a = C 40c to +85c (note 1 ) symbol parameter condition min typ max units f max maximum nrz data rate 3.2 gbps f max maximum clock rate 2.7 ghz t pd propagation delay from input - to - output 275 ps r j random jitter note 2 2 ps rms d j deterministic jitter note 3 5 20 ps pp t skdiff cml output differential skew any differential pair - duty cycle distortion 7 25 ps t skew cml output channel - to - channel note 4 , any two outputs 15 40 ps t r , t f cml output rise/fall times (20% to 80%) 80 135 ps notes: 1. ac characteristics are guaranteed by design and characterization. tested using environmen t of figure 6, 50 ? equivalent load. 2. measured with 100mvp - p noise (f 2mhz) on the power supply. 3. deterministic jitter (d j ) is the arithmetic sum of pattern - dependent jitter pulse width distortion. 4. this represents the skew on a qa and qb output with their inputs receiving the same signal . downloaded from: http:///
micrel , inc. sy55859l january 2010 6 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics downloaded from: http:///
micrel , inc. sy55859l january 2010 7 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 typical characteristics figure 1. input structure figure 4. input range figure 2. output structure figure 5a. input levels figure 3a. output levels figure 5b. input levels figure 3b. output levels figure 6. output interface downloaded from: http:///
micrel , inc. sy55859l january 2010 8 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 functional characteristics sy55859l is a dual cross point with excellent pin - to - pin and part - to - part skew matching. as shown in table 1, based on the logic value at ttl input sela0, output qa0 replicates either input da0 or da1. ttl input sela1 selects whether output qa1 replicates input da0 or da1. as shown in table 2, ttl inputs selb0 and selb1 perform similarly for outputs qb0 and qb1 respectively, choosing between inputs db0 or db1. if the two control inputs are tied together, sy55859l behaves as a redundant distribution device. depending on the state of the combined control inputs, qa0 and qa1 will both replicate either da0 or da1. if the two control inputs are made the logical complement of each other, the sy55859l functions as a crosspoint, either sending da0 to qa0 and da1 to qa1, or sending da0 to qa1 and da1 to qa0. the same applies to channel b. sy85859ls cml outputs are source terminated to 50? individually, 100? differe ntially. the cml inputs are parallel terminated, also to 50?. this improves signal integrity. with all terminations on chip, high - speed interfacing is greatly simplified, eliminating the need for external termination passive components. figures 1 and 2 show the input and output structures. sela0 sela1 qa0 qa1 function 0 0 da0 da0 fanout buffer 0 1 da0 da1 dual buffer 1 0 da1 da0 dual buffer 1 1 da1 da1 fanout buffer ctl ctl same same redundant distribution ctl /ctl opposite opposite crosspoint ta ble 1. input to output connectivity, crosspoint a sela0 sela1 qa0 qa1 function 0 0 da0 da0 fanout buffer 0 1 da0 da1 dual buffer 1 0 da1 da0 dual buffer 1 1 da1 da1 fanout buffer ctl ctl same same redundant distribution ctl /ctl opposite opposite c rosspoint table 2. input to output connectivity, crosspoint b downloaded from: http:///
micrel , inc. sy55859l january 2010 9 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 functional block diagram downloaded from: http:///
micrel , inc. sy55859l january 2010 10 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 application information the eight ttl compliant inputs to sy55859l are ena0, ena1, enb0 enb1, sela0, sela1, selb0 and selb1. these high impedance inputs do not default to a stable logic state when left unconnected. therefore, these ttl compliant inputs cannot be left floating. connect these inputs to a valid control signal, or hardwire to v cc or gnd. the four enable ttl inputs, when driven low, disable the co rresponding output stage. this reduces power consumption. disabled output stages do not go into a high impedance state. rather, each pin of a disabled output stage pair goes high through its respective 50 ? source termination. the delay from a logic transition on an enable input to the corresponding effect on the cml output is not defined in the tables of this data sheet. this delay is 3ns typical, and 10ns maximum. please note that, for cases where highly capacitive lines are being driven, the rc effects of the line may make this delay longer. the delay from a logic transition on a select input to the corresponding cml output is also not defined in the tables. it is 300psec typical, 500psec maximum. for best performance, use good high frequency layout techniques, filter v cc supplies, and keep ground connections short. use multiple vias where possible. also, use controlled impedance transmission lines to interface with the sy55859l data inputs and outputs. downloaded from: http:///
micrel , inc. sy55859l january 2010 11 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 related product and support documentation part number function data sheet link sy55854u 2x2 cml crosspoint www.micrel.com/product - info/products/sy55854u.shtml sy55858u dual 2x2 cml crosspoint www.micrel.com/product - info/products/sy55858u.shtml downloaded from: http:///
micrel , inc. sy55859l january 2010 12 m9999 - 0121 10 -a hbwhelp@micrel.com or (408) 955 - 1690 package information 32 - pin epad - qfn 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 the information furnished by micrel in this data sheet is believed to be accurate and reliable. however, no responsibility is assumed by micrel for i ts use. micrel reserves the right to change circuitry and specifications at any time without notification 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 device s or systems that (a) are intended for surgical im plant 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 purchasers use or sale of micrel products for use in life support appliances, devices or systems i s a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 200 5 micrel, incorporated. downloaded from: http:///

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