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sy58621l precision 3.2gbps cml/lvpecl 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-b hbwhelp@micrel.com or (408) 955-1690 general description the sy58621l is a low jitter, high-speed transceiver with a variable swing lvpecl transmitter buffer and a cml high-gain receiver optimized for precision telecom and enterprise server transmission line and backplane data management. the sy58621l distributes data to 3.2gbps guaranteed over temperature and voltage. the sy58621l transmitter differential input includes micrels unique, patented 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 receiver output is 50_ source-terminated cml and the transmitter output is variable swing 80mv to 800mv lvpecl with extremely fast rise/fall time. to support remote self-testing, the sy58621l 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 sy58621l operates from a 3.3v 10% supply and is guaranteed over the full industrial temperature range of C40c to +85c. the sy58621l is part of micrels high-speed, precision edge ? product line. for applications that requires a cml receiver and transmitter, consider the sy58620l. all support documentation can be found on micrels web site at: www.micrel.com . applications backplane management active cable transceivers sonet/sdh data/clock applications 4x fibre channel applications precision edge ? features guaranteed ac performance over temperature and voltage: - maximum throughput 3.2gbps - <160ps t r /t f time transmitter - patented input termination directly interfaces to ac- or dc-coupled differential inputs - variable swing lvpecl output receiver - 32db high-gain input - 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 los 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 enables on transmitter and receiver outputs power supply +3.3v 10% industrial temperature range -40c to +85c available in 24-pin (4mm x 4mm) qfn markets precision telecom enterprise server ate test and measurement downloaded from: http:///
micrel, inc. sy58621l january 2006 2 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 typical applications functional block diagram note:it is recommended that r loslvl 10k ? . see the typical operating characteristics section for more details. downloaded from: http:///
micrel, inc. sy58621l january 2006 3 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 ordering information (1) part number package type operating range package marking lead finish sy58621lmg qfn-24 industrial 621l with pb-free bar-line indicator nipdau pb-free sy58621lmgtr (2) qfn-24 industrial 621l with pb-free bar-line indicator nipdau pb-free notes: 1. contact factory for die availability. dice are guaranteed at t a = 25oc, dc electricals only. 2. tape and reel. pin configuration 24-pin qfn downloaded from: http:///
micrel, inc. sy58621l january 2006 4 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 pin descriptioninputs pin number pin name pin description 23 loopback loopback mode control. ttl/cmos control input. loopback is an active high signalused to control the loopback mux. loopback is internally connected to a 25k w pull- down resistor and will default 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 toenable the receiver outputs. /rxen is internally connected to a 25k w pull-down resistor and will default to a low 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 w . input will default to an indeterminate state if left open. see figure 6b. 7 /txen transmitter output control. ttl/cmos control input. /txen is an active low signal used toenable the transmitter output. /txen is internally connected to a 25k w 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 as100mv (200mv pp ). each pin terminates to the txvt pin through 50 w . note that this input will default to an indeterminate state if 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 (max swing) to v cc (min swing). control of the output swing can be obtained by using 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 moredetails. 11 txvt input termination center-tap. each side of the transmitter differential input pair terminates tothe txvt pin. the txvt pin provides a center-tap to a termination network for maximum interface flexibility. refer to the input stage section for more details. downloaded from: http:///
micrel, inc. sy58621l january 2006 5 m9999-012006-b 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 w pull-up resistor. loss-of- signal asserts to logic high when the receiver input amplitudes fall 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 amplitude 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 w pull-down resistor to an internal v ref voltage source. see typical operating characteristics, and application implementation sections for more details. 17, 16 rxq, /rxq receiver differential output. output is cml compatible. refer to the truth table andoutput stage sections for more details. unused output pair may be left open. the output is designed to drive 400mv (800mv pp ) into 50 w to v cc or 100 w across the pair. 5, 6 txq, /txq transmitter differential variable swing output. output is lvpecl-compatible. please referto the truth table section for details. unused output pair may be left open. each output is designed to drive 80mv (min) to 800mv (typ) into 50_ to v cc -2v depending 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 thetxvt pin and bypass with a 0.01 f 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 the same ground plane. 12, 15, 18 vcc 3.3v 10% positive power supply. bypass with 0.1 f//0.01 f 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 externally. 21 vcc_rxin 3.3v 10% receive input power supply. bypass with 0.1 f//0.01 f 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 0.1 f//0.01 f 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 table loopback rxq txq 0 rxin txin 1 txin rxin downloaded from: http:///
micrel, inc. sy58621l january 2006 6 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) supply voltage (v cc , v cc _ txq , v cc _ rxin ) .........................C0.5v to +4.0v input voltage loslvl.............................................. v ref C1.2v to v cc loopback ................................................C0.5v to v cc /txen, /rxen ............................................C0.5v to v cc txvctrl.............................vref_ctrl C1.2v to v cc txin, /txin.................................................C0.5v to v cc lvpecl output current (i out ) txq, /txq continuous .................................................. .........50ma surge.................................................. ................100ma source or sink current on txvt .................................................. ................100ma los .................................................. ......................5ma rxq, /rxq.................................................. .........25ma rxin, /rxin.................................................. .......10ma txin, /txin.................................................. ........50ma txvref-ac, vref-ctrl ..................................2ma lead temperature (soldering, 20sec.) ....................... 260c storage temperature (t s ) ......................... C65c to +150c operating ratings (2) supply voltage (v cc , v cc _ txq , v cc _ rxin ) ..................+3.0v to +3.6v ambient temperature (t a ) ....................C40c to +85c package thermal resistance (3) qfn ( q ja ) still-air.................................................. .....50c/w qfn ( y jb ) junction-to-board .....................................30c/w dc electrical characteristics (4) t a = C40c 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 100 150 ma receiver input dc electrical characteristicsv cc_rxin = 3.3v 10%; t a = C40c 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 5aac-coupled 10 900 mv v diff_in differential input voltage swing|rxin - /rxin| see figure 5bac-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 operation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum rating conditions forextended periods may affect device reliability. 2. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the pcb. q ja and y jb values are determined for a 4-layer board in still-air, unless otherwise stated. 4. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been established. downloaded from: http:///
micrel, inc. sy58621l january 2006 7 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 receiver output dc electrical characteristicsv cc = 3.3v 10%, r l = 100 ? across the outputs; t a = C40c 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 C0.020 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 mv 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 C140 +140 mv transmitter input dc electrical characteristicsv cc = 3.3v 10%; t a = C40c 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 reference voltage v cc -1.4 v cc -1.3 v cc -1.3 v v ref_ctrl output reference voltage v cc -1.4 v cc -1.3 v cc -1.3 v v txvctrl input voltage(txvctrl) vref_ctrl v cc v downloaded from: http:///
micrel, inc. sy58621l january 2006 8 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 transmitter output dc electrical characteristicsv cc_txq = 3.3v 10%, r l = 50 ? to v cc_txq C 2v; t a = C40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v oh output high voltage(txq, /txq) v cc_txq - 1.145 v cc_txq -1.020 v cc_txq -0.895 v txvctrl = v ref_ctrl v cc_txq - 1.945 v cc_txq - 1.820 v cc_txq - 1.695 v v ol output low voltage(txq, /txq) txvctrl = v cc_txq v cc_txq - 1.100 v txvctrl = v ref_ctrl see figure 5a 550 800 mv v out output voltage swing(txq, /txq) txvctrl = v cc_txq see figure 5a 80 mv txvctrl = v ref_ctrl see figure 5b 1100 1600 mv v diff_out differential output voltage swing(txq, /txq) txvctrl = v cc_txq see figure 5b 160 mv lvttl/cmos input dc control electrical characteristics (5) v cc = 3.3v 10%; t a = C40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v il /txen, /rxen, loopback 0.8 v v ih /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. downloaded from: http:///
micrel, inc. sy58621l january 2006 9 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 los dc electrical characteristicsv cc = 3.3v 10%; t a = C40c to +85c. symbol parameter condition min typ max units v loslvl loslvl voltage range v ref v cc v v oh output high voltage source 100 a; v cc 3.3v 2.4 v v ol output low voltage sink 2ma 0.5 v vsr los sensitivity range 7 35 mv pp r loslvl = 10k ? 2 7 -1 data pattern, note 7 622mbps 15 mv los al low los assert level 3.2gbps 10 mv r loslvl = 10k ? 2 7 -1 data pattern, note 7 622mbps 20 mv los dl low los de-assert level 3.2gbps 15 mv r loslvl = 10k ? , limiting mode 2 7 -1 data pattern, note 6 and 7 622mbps 3 db hys l low los hysteresis 3.2gbps 5.5 db r loslvl = 5k ? 2 7 -1 data pattern, note 7 622mbps 20 mv los am medium los assert level 3.2gbps 15 mv r loslvl = 5k ? 2 7 -1 data pattern, note 7 622mbps 30 mv los dm medium los de-assert level 3.2gbps 25 mv r loslvl = 5k ? , limiting mode 2 7 -1 data pattern, note 6 and 7 622mbps 4 db hys m medium los hysteresis 3.2gbps 5.5 db r loslvl = 1k ? 2 7 -1 data pattern, note 7 622mbps 35 mv los ah high los assert level 3.2gbps 30 mv r loslvl = 1k ? 2 7 -1 data pattern, note 7 622mbps 60 mv los dh high los de-assert level 3.2gbps 55 mv r loslvl = 1k ? , limiting mode 2 7 -1 data pattern, note 6 and 7 622mbps 5 db hys h high los hysteresis 3.2gbps 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. downloaded from: http:///
micrel, inc. sy58621l january 2006 10 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 ac electrical characteristics (8) v cc = v cc_txq = v cc_rxin = 3.3v 10%, receiver load: r l = 100 ? across the outputs. transmitter load: r l = 50 ? to v cc_txq C 2v; t a = C40c to +85c, unless otherwise stated. receiver and transmitter symbol parameter condition min typ max units deterministic jitter (dj) note 9 note 13 ps pp random jitter (rj) note 10 0.7 5 ps rms t jitter 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 ) 3.2 gbps bw -3db v rxin 10mv (20mv pp ) 2.5 ghz s 21 single-ended gain linear mode 32 db a v(diff) differential voltage gain linear mode 38 db t r , t f output rise/fall time(20% to 80%) limiting mode 60 120 ps losfrequency range los operating frequencyrange note 12 0.622 3.2 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 ) 3.2 gbps bw -3db v ref_ctrl txctrl v cc_txq 2 ghz t r , t f output rise/fall time(20% to 80%) v txvctrl = vref_ctrl 100 160 ps notes : 8. high-frequency ac-parameters are guaranteed by design and characterization. 9. deterministic jitter is measured with both k28.5 and 2 23 -1 prbs data-pattern, measured at micrel, inc. sy58621l january 2006 11 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 detailed descriptionreceiver the receiver ac-coupled differential input distributes data to 3.2gbps with signals as small as 10mv (20mv pp ) or as large as 900mv (1.8v pp ). the receiver input features an internal 50 ? input termination connected to an internal reference which optimizes the inputs for ac-coupled signals. input signals are linearly amplified with 38db of differential gain and the output signal is limited to 400mv (800mv pp ). the receiver output buffer features 50 ? source termination resistors and a current source that provides 400mv (800mv pp ) swing into 50 ? termination. the output buffers terminates to standard cml loads (100 ? across the output pair or equivalent). see the output stage receiver section for more details. transmitter the transmitter differential input includes micrels unique, patented 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 transmitter output buffer terminates to standar d lvpecl loads (r l = 50 _ to v cc_txq -2v). the output buffer is a special variable swing lvpecl buffer controlle d by txvctrl. the output buffer features emitter followe r output that provides 80mv (160mv pp ) to 800mv (1.6v pp ) swing into 50 _ transmission lines. see the next section and figures 1a and 1b for more details on how to co ntrol the variable output swing feature . figure 1a. voltage source implementation figure 1b. alternative implementation transmitter pecl variable-swing output buffer connecting v ref_ctrl to txvctrl sets the transmitter output buffer to maximum swing setting txvctrl to v cc_txq , sets the transmitter output buffer to minimum swing control of the transmitter output swing buffers can be obtained by using a variable resistor connectedbetween v ref_ctrl and v cc_txq with a wiper connected to txvctrl as shown in figure 1b receiver los the sy58621l features a chatter-free loss-of-signal (los) ttl compatible output with an internal 4.75k ? pull-up resistor. los circuitry monitors the input receiver signal and asserts a signal when the input signal falls below the threshold set by the programmable los level set pin (loslvl). when the amplitude of the receiver input signal falls below the threshold, los is asserted high with a response time of ~0.2us. los can be fed into /rxen to maintain output stability by disabling the output during a loss- of-signal condition. figure 2a and 2b shows the los connection to /rxen. when /rxen is high, the output signal rxq is held low and /rxq is held high. typically, 2db of los hysteresis is adequate to prevent the receiver output from chattering. los operation is optimized for data rates 622mbps with an input receiver amplitude of at least 10mv (20mv pp ). due to the long time constant in slower data rates below 622mbps, the sy58621l los function does not guarantee chatter-free operation for low amplitude signals. loslvl sets the threshold of the los input amplitude detection. connecting an external resistor, r loslvl , downloaded from: http:///
micrel, inc. sy58621l january 2006 12 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 between vcc and loslvl sets the input amplitude 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 . see 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 receiveroutput 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 toloslvl, as shown in figure 2b downloaded from: http:///
micrel, inc. sy58621l january 2006 13 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 2db hysteresis is insured if r loslvl 10k ? los is guaranteed chatter-free at f 622mbps (311mhz) hysteresis the sy58621l provides a minimum of 2db of los hysteresis, see the figure 3 for 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 sy58621l 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 3.2gbps data rate throughput. crosstalk the sy58621l 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 receiver traces horizontal to the transmitter traces and route the transmitter traces vertical to the receiver traces. downloaded from: http:///
micrel, inc. sy58621l january 2006 14 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 prbs discussionlos 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. deterministic 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 period), low frequency jitter components can be accumulated. power supply filtering although the sy58621l is fully differential, it is recommended that the power supplies are filtered as shown in figure 4. figure 4. power supply filtering scheme item description 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 downloaded from: http:///
micrel, inc. sy58621l january 2006 15 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 typical operating characteristicsv cc = v cc_txq = v cc_rxin = 3.3v 10%, receiver: r l = 100 ? across the outputs. transmitter: r l = 50 ? to v cc_txq C2v; t a = 25c, unless otherwise stated. r loslvl (k ? ) r loslvl (k ? ) r loslvl (k ? ) downloaded from: http:///
micrel, inc. sy58621l january 2006 16 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 single-ended and differential swings figure 5a. single-ended voltage swing figure 5b. differential voltage swing input stage figure 6a. tx simplified differential input stage figure 6b. rx simplified differential input stage downloaded from: http:///
micrel, inc. sy58621l january 2006 17 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 output stagereceiver 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 ) downloaded from: http:///
micrel, inc. sy58621l january 2006 18 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 transmitter the transmitters output is a variable swing lvpecl open emitter driver. lvpecl has very low output (open emitter) impedance, and small signal swing which result in low emi. lvpecl is ideal for driving 50 ? and 100 ? -controlled impedance transmission lines. there are several techniques for terminating the lvpecl output: parallel termination-thevenin equivalent, parallel termination (3-ressitor), and ac-coupled termination. unused output pairs may be left floating. however, the unused half of a single-ended output must be terminated, or balanced. figure 8a. parallel thevenin-equivalent termination figure 8b. parallel termination C 3-resistors downloaded from: http:///
micrel, inc. sy58621l january 2006 19 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 interface applications figure 9a. lvpecl interface (tx dc-coupled/rx ac-coupled) figure 9b. lvpecl interface (tx ac-coupled/rx ac-coupled) figure 9c. cml interface (tx dc-coupled/rx ac-coupled) figure 9d. cml interface (tx ac-coupled/rx ac-coupled) figure 9e. lvds interface (tx dc-coupled/rx ac-coupled) related product and support documentation part number function data sheet link sy58620l precision 4.25gbps cml transceiver withintegrated loopback www.micrel.com/product-info/products/sy58620l.shtml hbw solutions new products and applications www.micrel.com/product-info/products/solutions.shtml downloaded from: http:///
micrel, inc. sy58621l january 2006 20 m9999-012006-b hbwhelp@micrel.com or (408) 955-1690 package information 24-pin 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 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 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 significant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2006 micrel, incorporated. downloaded from: http:///

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