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| sy58620l pr ecision 4.25gbps cml backplane transceiver with integrated loopback precision edge is a registered 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 2006 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 general description the sy58620l is a low jitter, high - speed transceiver with a variable swing cml transmitter buffer and a cml high - gain receiver optimized for precision telecom and enterprise server transmission line and backplane data management. the sy 58620l distributes data to 4.25gbps guaranteed over temperature and voltage. the sy58620l transmitter differential input includes micrel?s unique, 3 - pin input termination architecture that directly interfaces to any (ac - or dc - coupled) differential signal as small as 100mv (200mv pp ) without any termination resistor network in the signal path. the receiver differential input is optimized to interface directly to ac - coupled signals as small as 10mv (20mv pp ). the outputs are 50 ? source - terminated cml with extr emely fast rise/fall time. to support remote self - testing, the sy58620l features a high - speed loopback test mode. the input control signal loopback enables an internal loopback path from the transmitter input to the receiver output. the sy58620l operates f rom a 3.3v 10% supply and is guaranteed over the full industrial temperature range of ? 40c to +85c. the sy58620l is part of micrel?s high - speed, precision edge ? product line. all support documentation can be found on micrel?s web site at: www.micrel.com . applications ? backplane management ? active cable transceivers ? sonet/sdh data/clock applications ? 4x fibre channel applications typical applications precision edge ? features ? guaranteed ac p erformance over temperature and voltage: - maximum throughput 4.25gbps - <120ps t r /t f time ? transmitter - patented input termination directly interfaces to ac - or dc - coupled differential inputs - variable swing cml output ? receiver - 32db high - gain inpu t - internal 50 ? input termination - accepts ac - coupled input signals as small as 10mv (20mv pp ) - 400mv (800mv pp ) differential cml output swing ? loss - of - signal (los) - high - gain, ttl - compatible los output with internal 4.75k ? pull - up - programmable lo s level set ? ultra - low jitter design - <5ps rms random jitter ? patent - pending mux isolates the receiver and the transmitter channels minimizing on crosstalk ? selectable loopback diagnostic mode ? output enable ? power supply +3.3v 10% ? industrial temperature r ange - 40c to +85c ? available in 24 - pin (4mm x 4mm) qfn markets ? precision telecom ? enterprise server ? ate ? test and measurement
micrel, inc. sy58620l january 2006 2 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 functional block diagram note: it is recommended that r loslvl 10k ? . see the ?typical operating characteristics? section for more details. micrel, inc. sy58620l january 2006 3 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead finish sy58620lmg qfn -24 industrial 620l with pb - free bar - line indicator nipdau pb - fr ee sy58620lmgtr (2) qfn -24 industrial 620l with pb - free bar - line indicator nipdau pb - free notes: 1. contact factory for die availability. dice are guaranteed at t a = 25 o c, dc electricals only. 2. tape and reel. pin configuration 24- pin qfn micrel, inc. sy58620l january 2006 4 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 pin de scription inputs pin number pin name pin description 23 loopback loopback mode control. ttl/cmos control input. loopback is an active high signal used to control the loopback mux. loopback is inte r nally connected to a 25k ? pull - down resistor and will def ault to a low state if left open. v th = v cc /2. 20 /rxen receiver output control. ttl/cmos control input. /rxen is an active low signal used to enable the receiver outputs. /rxen is inte r nally connected to a 25k ? pull - down resistor and will default to a l ow state if left open. v th = v cc /2. 1, 2 rxin, /rxin receiver differential input. input accepts ac differential signals as small as 10mv (20mv pp ). each pin internally terminates to v cc_rxin - 1.3v (internal voltage reference) through 50 ? . input will defa ult to an indeterm i nate state if rxin inputs are left open. see figure 6b. 7 /txen transmitter output control. ttl/cmos control input. /txen is an active low signal used to enable the transmitter output. /txen is inte r nally connected to a 25k ? pull - down resistor and will default to a low state if left open. v th = v cc /2. 14, 13 txin, /txin transmitter differential input. input accepts ac - or dc - coupled differential signals as small as 100mv (200mv pp ). each pin terminates to the txvt pin through 50 ? . in put will default to an indeterminate state if txin inputs are left open. see figure 6a. 9 txvctrl transmitter output swing control. input that controls the output amplitude of the transmitter. the operating range of the control input is from v ref_ctrl (ma x swing) to v cc (min swing). control of the output swing is obtained with a variable resistor between v ref_ctrl and v cc_txq through a wiper driving txvctrl. setting txvctrl to v cc_txq sets the output swing to min swing. refer to the ?interface applications ? and ?output stage? sections for more details. 11 txvt input termination center - tap. each side of the transmitter differential input pair terminates to the txvt pin. the txvt pin provides a center - tap to a termination network for maximum interface flexib ility. refer to the ?input stage? section for more details. micrel, inc. sy58620l january 2006 5 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 outputs pin number pin name pin description 22 los loss -of - signal output. ttl- compatible output with internal 4.75k ? pull - up resistor. loss -of - signal a s serts to logic high when the receiver in put amplitudes falls below the threshold set by loslvl. 19 loslvl rx loss -of - signal level set. a resistor (r loslvl ) connected between loslvl and v cc sets the threshold for the data input a m pl i tude at which the los output is asserted. default is max sensitivity. loslvl is used to set the loss -of - signal (los) voltage. it is internally connected to a 2.8k ? pull - down resistor to an internal v ref voltage source. see ?typical operating characteristics,? and ?application implementation? sections for more d etails. 17, 16 rxq, /rxq receiver differential output. output is cml compatible. refer to the ?truth table? and ?output stage? sections for more details. u n used output pair may be left open. the output is designed to drive 400mv (800mv pp ) into 50 ? to v c c or 100 ? across the pair. 5, 6 txq, /txq transmitter differential variable swing output. output is cml compatible. please refer to the ?truth table? and ?output stage? sections for more details. unused output pair may be left open. the output is d e signe d to drive 80mv (160mv pp ) min swing to 400mv (800mv pp ) typ. swing into 50 ? to v cc_txq or drive 100 ? across the pair depen d ing on txvctrl. 8 vref_ctrl transmitter output reference voltage. output biases to v cc _ txq - 1.3v. connecting v ref_ctrl to txvctrl sets the transmitter output swing to max swing. 10 txvref -ac transmitter input reference voltage. this output biases to v cc - 1.3v. it is used when ac coupling the transmitter input. for ac - coupled applications, connect txvref - ac to the txvt pin and bypass w ith a 0.01f low esr capacitors to v cc . see ?input stage? section for more details. maximum sink/source current is 1.5ma. power pins pin number pin name pin description 3, 24 gnd, exposed pad ground. gnd pins and exposed pad must be connected to t he same ground plane. 12, 15, 18 vcc 3.3v 10% positive power supply. bypass with 0.1f//0.01f low esr capacitors and place as close to each v cc pins as possible. power pins are not connected internally and must be connected to the same power supply exte rnally. 21 vcc_rxin 3.3v 10% receive input power supply. bypass with 0.1f//0.01f low esr capacitors and place as close to the v cc_rxin pin as possible. power pins are not connected internally and must be connected to the same power supply externally. 4 vcc_txq 3.3v 10% output transmit power supply. bypass with 0.1f//0.01f low esr capacitors and place as close to the v cc_txq pin as possible. power pins are not connected internally and must be connected to the same power supply externally. truth ta ble loopback rxq txq 0 rxin txin 1 txin rxin micrel, inc. sy58620l january 2006 6 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) supply voltage (v cc , v cc _ txq , v cc _ rxin ) ....................... ? 0.5v to +4.0v input voltage loslvl ........................................... v ref ? 1.2v to v cc loopback ............................................. ? 0.5v to v cc /txen, /rxen ......................................... ? 0.5v to v cc txvctrl ............................. vref_ctrl - 1.2v to v cc txin, /txin .............................................. ? 0.5v to v cc source or sink current on txvt ............................................................... 100ma los ..................................................................... 5ma rxq, /rxq ....................................................... 25ma txq, /txq ........................................................ 25ma rxin, /rxin ...................................................... 10ma txin, /txin ....................................................... 50ma txvref - ac, vref - ctrl ................................. 2ma lead temperature (soldering, 20sec.) ..................... 260c storage temperature (t s ) ....................... ? 65c to +150c operating ratings (2) supply voltage (v cc , v cc _ txq , v cc _ rxin ) ................ +3.0v to +3.6v ambient temperature (t a ) .................. ? 40c to +85c package thermal resistance (3) qfn ( ja ) still - air .................................................... 50c/w qfn ( jb ) junction - to - board ................................... 30c/w dc electrical characteristics (4) t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v cc power supply 3 3.3 3.6 v v cc_txq transmit power supply 3 3.3 3.6 v v cc_rxin receive power supply 3 3.3 3.6 v i cc power supply current no load, max. v cc 100 1 50 ma receiver input dc electrical characteristics v cc_rxin = 3.3v 10%; t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units r in input resistance (rxin to vref) 45 50 55 ? r diff_in input resistance (rxin to /rxin) 90 100 110 ? v in input voltage swing (rxin, /rxin) see figure 5a ac - coupled 10 900 mv v diff_in differential input voltage swing |rxin - /rxin| see figure 5b ac - coupled 20 1800 mv v ref internal reference voltage v cc_rxin - 1.48 v cc_rxin - 1.32 v cc_rxin - 1.16 v notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional opera tion is not implied at conditions other than those detailed i n the operational sections of this data sheet. exposure to absolute maximum rating 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. pac kage thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the pcb. ja and jb values are determined for a 4 - layer board in still - air, unless otherwise stated. 4. the circuit is designed to meet the d c specifications shown in the above table after thermal equilibrium has been established. micrel, inc. sy58620l january 2006 7 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 receiver output dc electrical characteristics v cc = 3.3v 10%, r l = 100 ? across the outputs; t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v oh output high voltage (rxq, /rxq) r l = 50 ? to v cc v cc ? 0.020 v cc - 0.010 v cc v v out output voltage swing (rxq, /rxq) see figure 5a 325 400 500 mv v diff_out differential output voltage swing (rxq, /rxq) see figure 5b 650 800 1000 m v r out single - ended output impedance 45 50 55 ? r diff_out differential output impedance 90 100 110 ? v offset differential output offset r l = 50 ? to v cc , limiting mode ? 140 +140 mv transmitter input dc electrical characteristics v cc = 3.3v 10%; t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units r in input resistance (txin to txvt) 45 50 55 ? r diff_in differential input resistance (txin to /txin) 90 100 110 ? v ih input high voltage (txin, /txin) 1.2 v cc v v il input low voltage (txin, /txin) 0 v ih - 0.1 v v in input voltage swing (txin, /txin) see figure 5a 0.1 v cc v v diff_in differential input voltage swing |txin - /txin| see figure 5b 0.2 v v t_in txin, /txin to vt 1.28 v v txvref - ac output refer ence voltage v cc - 1.4 v cc - 1.3 v cc - 1.2 v v ref_ctrl output reference voltage v cc - 1.4 v cc - 1.3 v cc - 1.2 v v txvctrl input voltage (txvctrl) vref_ctrl vcc v transmitter output dc electrical characteristics v cc_txq = 3.3v 10%, r l = 100 ? across the outputs; t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v oh output high voltage (txq, /txq) r l = 50 ? to v cc_txq v cc_txq - 0.020 v cc_txq - 0.005 v cc_txq v v out output voltage swing (txq, /txq) t xvctrl = v ref_ctrl see figure 5a 325 400 mv txvctrl = v cc_txq see figure 5a 80 mv v diff_out differential output voltage swing (txq, /txq) txvctrl = v ref_ctrl see figure 5b 650 800 mv txvctrl = v cc_txq see figure 5b 160 mv r out single - ended ou tput impedance 45 50 55 ? r diff_out differential output impedance 90 100 110 ? micrel, inc. sy58620l january 2006 8 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 lvttl/cmos input dc electrical characteristics (5) v cc = 3.3v 10%; t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v il /txen, /rxen, loopback 0.8 v v i h /txen, /rxen, loopback 2 v i il /txen, /rxen, loopback i il @v in = 0.5v 0 50 a i ih /txen, /rxen, loopback i ih @v in = v cc 300 a note : 5. /txen, /rxen, and loopback have an internal pull - down 25k ? resistor. micrel, inc. sy58620l january 2006 9 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 los dc electrical characteristics v cc = 3.3v 10% ; t a = ? 40c to +85c. symbol parameter condition min typ max units v loslvl loslvl voltage range v ref v cc v v oh output high voltage i source = -100 a; v cc 3.3v 2.4 v v ol output low voltage i ol = 2ma 0.5 v vsr los sensitivity range 7 35 mv pp los al low los assert level r loslvl = 10k ? 2 7 - 1 data pattern, note 7 622mbps 15 mv 4.25gbps 10 mv los dl low los de - assert level r loslvl = 10k ? 2 7 - 1 data pattern, note 7 622mbps 20 mv 4.25gbps 15 mv hys l low los hystere sis r loslvl = 10k ? , limiting mode 2 7 - 1 data pattern, note 6 and 7 622mbps 3 db 4.25gbps 5.5 db los am medium los assert level r loslvl = 5k ? 2 7 - 1 data pattern, note 7 622mbps 20 mv 4.25gbps 15 mv los dm medium los de - assert level r loslvl = 5k ? 2 7 - 1 data pattern, note 7 622mbps 30 mv 4.25gbps 25 mv hys m medium los hysteresis r loslvl = 5k ? , limiting mode 2 7 - 1 data pattern, note 6 and 7 622mbps 4 db 4.25gbps 5.5 db los ah high los assert level r loslvl = 1 k ? 2 7 - 1 data pattern, note 7 622mbps 35 mv 4.25gbps 30 mv los dh high los de - assert level r loslvl = 1k ? 2 7 - 1 data pattern, note 7 622mbps 60 mv 4.25gbps 55 mv hys h high los hysteresis r loslvl = 1k ? , limiting mode 2 7 - 1 data patt ern, note 6 and 7 622mbps 5 db 4.25gbps 5.5 db notes: 6. hysteresis is defined as: 20log 10 db. age assertvolt sd_de oltage sd_assertv ? ? ? ? ? ? ? ? ? 7. see the ?typical operating characteristics? section for more details on r loslvl and its associated los assert and de - assert amplitudes for a 2 7 - 1 prbs data pattern. see the ?prbs discussion? section for more details on the 2 7 - 1 prbs data pattern. micrel, inc. sy58620l january 2006 10 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 ac electrical characteristics (8) v cc = v cc_txq = v cc_rxin = 3.3v 10%, r l = 100 ? across the outputs; t a = ? 40c to +85c, unless otherwise stated. receiver and transmitter symbol parameter condition min typ max units t jitter deterministic jitter (dj) note 9 note 13 ps pp random jitter (rj) note 10 0.7 5 ps rms crosstalk - induced jitter note 11 1.2 ps rms receiver symbol parameter condition min typ max units f max maximum operating frequency v rxin 10mv (20mv pp ) 4.25 gbps bw -3db v rxin 10mv (20mv pp ) 2.5 ghz s 21 single - ended gain linear mode 32 db a v(diff) differenti al voltage gain linear mode 38 db t r , t f output rise/fall time (20% to 80%) limiting mode 60 120 ps los frequency range los operating frequency range note 12 0.622 4.25 gbps t off los de - assert time 0.1 0.5 s t on los assert time 0.2 0.5 s transmitter symbol parameter condition min typ max units f max maximum operating frequency v txin 100mv (200mv pp ) 4.25 gbps bw -3db v ref_ctrl txctrl v cc_txq 3.5 ghz t r , t f output rise/fall time (20% to 80%) v txvctrl = vref_ctrl 50 120 ps notes : 8. high - frequency ac - parameters are guaranteed by design and characterization. 9. det erministic jitter is measured with both k28.5 and 2 23 - 1 prbs data - pattern, measured at micrel, inc. sy58620l january 2006 12 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 los detection trip - point by setting up a voltage divider between vcc and v ref (an internal voltage source set at v cc - 1.3v), since there is a 2.8k ? internal resistor connected between loslvl and v ref . the input voltage range of loslvl ranges from v cc to v ref . see the ?functional block diagram? section and figures 2a and 2b, to see how r loslvl sets up a voltage divider between vcc and v ref . refer to the ?los output dc electrical characteristics? table and ?typical operating characteristics? section to see how different r loslvl values affect los sensitivity. figure 2a. voltage source implementation figure 2b. alternative implementation los output ? connecting the input /rxen to the los output as shown in figures 2a and 2b, maintains receiver output stability under a loss - of - signal condition ? sensitivity of the los signal can be programmed using the loslvl input by using a variable resistor connected to vcc with a wiper connected to loslvl, as shown in figure 2b ? 2db hysteresis is insured if r loslvl 10k?. ? los is guaranteed chatter - free at f 622mbps (311mhz) hysteresis the sy58620l provides a minimum of 2db of los hysteresis, see the figure 3 fo r more details. figure 3. los hysteresis assert/de - assert hysteresis is defined as: 20 log 10 db. age assertvolt sd_de oltage sd_assertv ? ? ? ? ? ? ? ? ? loopback to support diagnostic system testing, the sy58620l features a loopback test mode, activated by setting loopback to logic high. loopback mode enables an internal loopback path from the transmitter input to the receiver output and supports the full 4.25gbps data rate throughput. crosstalk the sy58620 features a patent - pending isolation between the receiver and transmitter channels . the following guide lines can be used to minimize on layout induced crosstalk: 1. ground stripping ground stripping is an effective method to reduce crosstalk. ground stripping involves running a ground trace between the receiver and transmitter channels. 2. vertical and horizontal traces another way to reduce crosstalk is to route the receiver and transmitter channels on separate layers with an embedded ground or power supply layer between the layers. when routing the traces on different layers, run the recei ver traces horizontal to the transmitter traces and route the transmitter traces vertical to the receiver traces. micrel, inc. sy58620l january 2006 13 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 prbs discussion los testing the los function is tested with a 2 7 - 1 prbs (pseudo random bit stream) data pattern. a prbs data pattern of 2 7 - 1 is used because it is a good approximation to an 8b10b - encoded nrz data stream. 8b10b encodes 8 bits of data and replaces it with 10 bits of symbol. the extra bits are added to improve transition density and the ber (bit error rate) of the system. det erministic jitter testing and the k28.5 pattern the k28.5 (11000001010011111010) and 2 23 - 1 prbs data patterns are used to characterize dj because both data patterns have lower spectral frequency content which provides a best approximation to scrambled nrz data streams. random jitter testing and the k28.7 pattern the k28.7 (1111100000?) data pattern is used to measure rj since the pattern is free of dj. in addition, because the k28.7 data pattern can be used to compare the t n (n th period) to the t 0 (1 st peri od), low frequency jitter components can be accumulated. power supply filtering although the sy58620l is fully differential, it is recommended that the power supplies are filtered as shown in figure 4. figure 4. power supply filtering scheme item desc ription c1, c2, c3, c23 0.1 f capacitor c4, c5, c6, c22 0.01 f capacitor l1, l2, l3 1.2 h ferrite bead inductor table 1. bill of materials micrel, inc. sy58620l january 2006 14 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics v cc = v cc_txq = v cc_rxin = 3.3v 10%, r l = 100 ? across the outputs; t a = 25c, unless otherwise stated. r loslvl (k ?) r loslvl (k ?) r loslvl (k ?) micrel, inc. sy58620l january 2006 15 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 single- ended and differential swings figure 5a. single - ended voltage swing figure 5b. differential voltage swing differential input stage figure 6a. tx simplified diffe rential input stage figure 6b. rx simplified differential input stage micrel, inc. sy58620l january 2006 16 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 output stage receiver figure 7a. receiver cml dc- coupled output figure 7b. receiver cml ac - coupled output figure 7c. receiver cml dc- coupled output (50 ? to v cc ) transmitter figure 7d. transmitter cml dc- coupled output figure 7e. transmitter cml ac - coupled output figure 7f. transmitter cml dc- coupled output (50 ? to v cc ) micrel, inc. sy58620l january 2006 17 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 interface applications figure 8a. lvpecl interface (tx dc - coupled/rx ac - coupled ) figure 8b. lvpecl interface (tx ac - coupled/rx ac - coupled) figure 8c. cml interface (tx dc - coupled/rx ac - coupled) figure 8d. cml interface (tx ac - coupled/rx ac - coupled) figure 8e. lvds interface (tx dc - coupled/rx ac - coupled) related p roduct and support documentation part number function data sheet link sy58621l precision 3.2 gbps cml/lvpecl transceiver with integrated loopback www.micrel.com/product - info/products/sy58621l.shtml hbw solutions new products and applications www.micrel.c om/product - info/products/solutions.shtml micrel, inc. sy58620l january 2006 18 m9999 - 012006-c hbwhelp@micrel.com or (408) 955 - 1690 package information 24- pin qfn micrel, inc. 2180 fortune dri ve 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 its 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 mal function o f 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 reasona bly expected to result in a significant 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 resulti ng from such use or sale. ? 2006 micrel, incorporated. |
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