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  sy58626l dc- to - 6.4gbps backplane transmit buffer with selectable output pre - emphasis, i/o dc - offset control, and 200m v - 3.0v pp output swing precision edge is a regis tered 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 june 2007 m9 999- 061207-c hbwhelp@micrel.com or (408) 955 - 1690 general description the sy58626l high - speed, low jitter transmit buffer is optimized for backplane and transmission line data - path management applications in automatic test equipment (ate) and test & measurement (t&m) systems. the buffer includes a cml c o m patible, variable swing output with selectable pre - emphasis. the sy58626l is capable of driving serial data from dc through 6.4gbps with a 3v pp (1.5v pk single ended) differential swing. the sy58626l differential input includes micrel?s unique, 3 - pin in put termination architecture that d i rectly interfaces to any dc - or ac - coupled, differential signal as small as 100mv pk without any termination resistor net works in the signal path. the outputs are 50 ? source - terminated cml with a programmable output swing from 200mv pp to 3v pp (100mv pk to 1.5v pk ). the sy58626l includes an output stage that provides 4 le v els of pre - emphasis. the output pre - emphasis level is programmed with a three - bit interface. unlike other transmitter solutions, the output pre - emphasis d uration can be programmed from 60ps to 400ps. the sy58626l operates at 3.3v 10% supply and is guaranteed over the commercial temper a ture range of 0c to +70c. the sy58626l transmitter is optimized to work with the sy58627l receiver. the sy58626l is p art of micrel?s high - speed, precision edge ? product line. data sheets and support doc u mentation can be found on m i crel?s website at: www.micrel.com . precision edge ? features ? transmit driver provides output pre - emphasis to extend transmission range ? 4 selectable pre - emphasis levels ? drives 6.4gbps up to 12 fr4 pcb trace, or longer comb i nations of fr4+cable+interconnect ? dc through 6.4g bps data rate throughput ? integrated loopback capability ? unique p re - emphasis: - programmable pre - emphasis magnitude - programmable pre - emphasis duration ? unique, flexible i/o: - internal termination to vttin pin interfaces to any differential ac - or dc - coupled signals - 50 ? source terminated cml outputs minimize round - trip reflections - programmable output swing control: 200mv - 3.0v pp - output disable and output shutdown - dc- offset control with vtt i/o ? 3.3v 10% supply voltage ? 0c to +70c tempe rature range ? available in 32 - pin (5mm x 5mm) qfn package applications ? ate, t&m backplane management ? combination fr4+cable+interconnect driver ? cable drivers ? electrical interface and interconnect applications that require dc - offset control
micrel, inc. sy58626l june 2007 2 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 functional block diagram
micrel, inc. sy58626l june 2007 3 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead finish sy58626lmh qfn -32 commercial sy58626l with bar - line pb- free indicator nipdau pb - free sy58626lmhtr (2) qfn -32 commercial sy58626l with bar - line pb- fr ee indicator nipdau pb - free notes: 1. contact factory for die availability. dice are guaranteed at t a = 25c, dc electricals only. 2. tape and reel. pin configuration 32- pin qfn
micrel, inc. sy58626l june 2007 4 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 pin description pin number pin name pin function 4, 5 txin, /txin differen tial inputs: this input pair is the differential signal input to the device. they accept ac - or dc - coupled signals as small as 100mv (200mv pp ). note that this input will default to an undetermined state if left open. txin and /txin internally terminate to the vttin pin through 50 ?. please refer to the input interface applications? section for more details. 7 vttin input termination center - tap: txin and /txin terminate to vttin. the vttin pin provides a center - tap to the internal termination network for m aximum interface flexibility and dc - offset capability. please refer to the ?input interface applications? section for more details. 8 vref -ac reference voltage: this output biases to v cc - 1.3v. it is used for ac - coupling the input pair (txin, /txin). con nect vref - ac directly to the vttin pin. bypass with a 0.01uf low esr capacitor to vcc. maximum sink/source current is 1.5ma. due to the limited drive capability, the vref - ac pin is only intended to drive the vttin pin. please refer to the ?input interfa ce applications? section for more details. 13 txvctrl analog input that controls txq output swing amplitude. the operating range of the control input is from vref - ctrl (max swing) to vcc (min swing). control of the output swing can be obtained by using a variable resistor between vref - ctrl and vcc with the wiper driving txvctrl. output swing ranges from 100mv pk to 1.5v pk . when the txq output is selected for maximum swing amplitude of 1.5v pk , no pre - emphasis is possible since the maximum swing cannot ext end beyond 1.5v pk . for applications that only require a fixed, full cml swing, connect txvctrl to vref - fixed. 12 vref - ctrl reference control voltage for txvctrl swing control. the operating range of the control input is from vref - ctrl (max swing) to vcc (min swing). control of the output swing can be obtained by using a variable resistor between vref - ctrl and vcc with the wiper driving txvctrl. maximum sink/source current is 1.5ma. 14 vref - fixed reference output voltage: connect this reference output pin directly to the txvctrl input pin, and the txq output swing is fixed to 400mv pk (800mv pp ). 24 /txen ttl/cmos (or vth controlled) compatible control input for the txq outputs pair . when pulled high, the txq output pair is disabled. this input is int ernally connected to a 25k ? pull - down resistor and will default to a logic low state (en able) if left open. when disabled, the txq out put goes low, and /txq goes high. default thres h old is vcc/2 when vth pin is floating. 29 /txlben ttl/cmos (or vth cont rolled) compatible control input for the txlbq output pair . when pulled high, the txlbq output pair is disabled. this input is internally connected to a 25k ? pull - down resistor and will default to a logic low state (en able) if left open. when disabled, t he txlbq out put goes low, and /txlbq goes high. default thres h old is vcc/2 when vth pin is floating. 1 lbsel loopback mux select control: the ttl/cmos (or vth controlled) com patible input selects the input to the loopback mode multiplexer. when lbsel in put is a logic high, the loopback mode is selected, and the rxlbin input pair is selected to pass through the txq ou t put . note that the lbsel pin is inte r nally connected to a 25k ? pull - down resistor and will default to a logic low state if left open (norm al operation). the loopback mux includes internal input isolation to min i mize crosstalk. 30, 31 rxlbin, /rxlbin loopback differential input pair: ac - coupled, cml compatible input. this input pair includes internal termination connected to an internal vbb for an ac - coupled bias c onfiguration. the rxlbin input pair receive s a signal from the rx buffer (sy58627l rxlbq) loopback output. this input pair does not include any equalization. when loopback mode is selected, the signal at the rxlbin input is directed to the txq output.
micrel, inc. sy58626l june 2007 5 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 pin description (continued) pin number pin name pin function 27, 28 txlbq, /txlbq transm it loopback differential output: cml compatible output pair with 400mv swing into a 50 ? load (100 ? across the pair). the txlbq output pai r is providing a copy of the txin input signal, bypassing the pre - emphasis stage. the sy58626l loopback function is optimized to ope r ate with the sy58627l receiver, and the txlbq output pair is ac - coupled directly to the txlbin i n put pair on the sy58627l. 23 /txqshdn txq shutdown control pin: the ttl/cmos (or vth controlled) compatible pin is an active low function. this input is internally connected to a 25k ? pull - up resistor and will default to a logic high state if left open. when pulled low, the txq and /txq output currents are shut off, and the txq and /txq output voltage is set to the same potential. the actual voltage level is set by the resistor divi der ratio e s tablished by the internal 50 ? source resistors (connected to vttout) and the external load. default thres h old is vcc/2 when vth pin is floating. 2 vth input logic threshold control voltage for logic control threshold settings other than lvtt l/cmos. this input control pin can be externally biased to set the proper threshold for all the logic control pins, /txen, lbsel, /txlben, 3 - bit pre- emphasis control, 2 - bit pre- emphasis duration control, and /txqshdn. for standard lvttl/cmos control, sim ply leave the vth pin floating and the threshold voltage defaults to v cc /2 (when vee=0v). for lvpecl thresholds, set vth to vcc - 1.3v. 21, 20 txq, /txq dif ferential variable swing output pair : this cml output pair is the output of the device. this outp ut is d e signed to drive 100mv pk to 1.5v pk into 50 ? (100 ? across the pair) with variable pre - emphasis. txq outputs include 50 ? source termination resistors. when the loopback mode is s e lected, the txq output pair is driven by the rxlbin inputs. 19, 22 vtt out output termination center - tap: each side of the differential output pair terminates to the vttout pin through 50 ? . the vttout pin provides a center - tap to the output termination network for maximum interface flexibility, and dc - offset capability. plea se refer to the ?cml output interface applications? section for more details. 17 18 32 mag_ctrl0 mag_ctrl1 mag_ctrl2 pre - emphasis magnitude level control input: ttl/cmos (or vth controlled) compatible, 3 - bit control interface. there are four levels of pr e - emphasis magnitude, as shown in the ?pre - emphasis magni tude truth table.? when mag_ctrl2 (msb) is logic 1, pre - emphasis is disabled and the txq outputs will not include any pre- emphasis. pre - emphasis magnitude ranges from 10% to 33% above the base swing. 10 11 dur_ctrl0 dur_ctrl1 pre - emphasis duration control input. ttl/cmos (or vth controlled) compatible, 2- bit control inte r face. this control establishes the pre - emphasis duration. duration ranges from 60ps to 400ps typ i cal as shown in the ?pre - emphasis duration control truth table.? pre - emphasis dur a tion is measured from the mid - point of the pre- emphasis magnitude (50% point). please refer to the ?pre - emphasis output description? for d e tails. 9, 15, 26 vcc positive power supply: connect to +3.3v power supply. bypass with 0.1f//0.01f low esr capacitors as close to vcc pins as possible. 3, 6, 16, 25 vee, exposed pad ground: ground pins and exposed pad must be connected to the same ground plane.
micrel, inc. sy58626l june 2007 6 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 pre - emphasis magnitude truth table disable mag select (msb=mag_ctrl2) magnitude select (mag_ctrl1) magnitude select (mag_ctrl0) pre - emphasis magnitude 0 0 0 10% 0 0 1 15% 0 1 0 25% 0 1 1 33% 1 x x disabled pre - emphasis duration control truth table duration dur_ctrl1 dur_ctrl0 typical data rate time dur ation minimum (shortest) 0 0 3.2gbps - 6.4gbps 60ps medium - short 0 1 100ps medium - long 1 0 dc- 3.2gbps 200ps longest 1 1 400ps pre - emphasis output description
micrel, inc. sy58626l june 2007 7 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) supply voltage (v cc ) ............................................... - 0.5v to +4.0v input voltage (v in ) ...................................................... - 0.5v to v cc input current (txin, /txin, 120mins) ................................ 67ma cml output current (i out ) continuous ( 120mins) ..................................................... 67ma surge .............................................................................. 100ma termination current v t .................................................................................. 100ma v ref - ac current source/sink current on v ref - ac .......................................... 2ma source/sink current on v ref - ctrl ....................................... 2ma lead tempe rature (soldering, 20 sec.) .............................. +260c storage temperature (t s ) ..................................... - 65c to 150 c operating ratings (2) supply voltage (v cc ) .................................... +3.0v to +3.6v ambient temperature (t a ) ............................... 0c to +70c package thermal resistance (3) qfn ( ja ) still - air ............................................................... 34c/w qfn ( jb ) junction -to - boar d .............................................. 20c/w dc electrical characteristics (4) t a = 0c to +70c; unless otherwise stated. symbol parameter condition min typ max units v cc power supply 3.0 3.3 3.6 v i ee power supply current max v cc, includes 50 ? internal source resistors, 1.5v pk out put swing, no external load current 290 370 ma r in input resistance (txin -to - vttin) 45 50 55 ? r diff_in differential input resistance (txin -to - /txin) 90 100 110 ? v ih input high voltage (txin, /txin) v ee +1.5 v cc v v il input low voltage (txin, /txi n) v ee +0.7 v ih - 0.1 v v in input voltage swing (txin, /txin) see figure 4a. 0.1 1.5 v pk v diff_in differential input voltage swing |txin - /txin| see figure 4b. 0.2 v pp v ttin txin -to - vttin (txin, /txin) 1. 28 v v ttin range vttin voltage range volta ge applied to vttin pin v ee +1.7 v cc +0.1 v v ttout range vttout voltage range voltage applied to vttout pin v cc - 1.5 v cc +1.5 v notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and fun c tional o peration is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maxi mum ratings 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. package 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 dc specifications shown in the above table after thermal equilibrium has been established . 500lfpm airflow. t j < 125 c.
micrel, inc. sy58626l june 2007 8 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 txq out puts dc electrical characteristics (5) v cc = 3.3v 10%; v ee = 0v; t a = 0c to + 70c; r l = 100 ? across output pair; unless otherwise stated. symbol parameter condition min typ max units v out range output voltage range (txq, /txq) v cc - 1.5 v cc v v out txq output voltage swing (txq, /txq) (6) maximum swing (txvctrl = vref - ctrl) no pre - emphasis 1500 mv pk minimum swing (txvctrl = v cc ) 100 fixed output swing (txvctrl = vref - fixed) 325 400 maximum swing (txvctrl = vref - ctrl) no pre - emphas is 3000 v diff_out txq differential output voltage swing |txq - /txq| (7) minimum swing (txvctrl = v cc ) 200 mv pp fixed output swing (txvctrl = vref - fixed) 650 800 r out output resistance 45 50 55 ? v ref - ac output voltage reference v cc - 1.4 v cc - 1.3 v cc - 1.2 v v ref - ctrl vref - ctrl output voltage v cc - 1.4 v cc - 1.3 v cc - 1.2 v txvctrl output swing control voltage range v ref - ac v cc v i tx q shdn txq shutdown leakage current -500 500 a txlbq cml outp ut dc electrical characteristics (5) v cc = 3.3v 10%; v ee = 0v; t a = 0c to + 70c; r l = 100 ? across output pair; unless otherwise stated. symbol parameter condition min typ max units v oh txlbq output high voltage r l = 50 ? to vcc v cc - 0.040 v cc - 0.010 v cc v v out txlbq output vol t age swing (txlbq, /txlbq) (6) 325 400 mv pk v diff_out txlbq differential ou t put voltage swing |txlbq - /txlbq | (7) 650 800 mv pp r out output impe d ance 45 50 55 ? notes: 5. the circuit is designed to meet the dc specifications shown i n the above table after thermal equilibrium has been established. 500lfpm airflow. t j < 125 c. 6. please refer to figure 4a. 7. please refer to figure 4b.
micrel, inc. sy58626l june 2007 9 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 logic control dc electrical characteristics (8) v cc = 3.3v 10%; v ee = 0v; t a = 0c to + 70c; unless other wise stated. symbol parameter condition min typ max units v ih input high voltage all control input pins v th +0.2 v cc v v il input low voltage all control input pins v ee v th ? 0.2 v v ctrl output swing control voltage range at txvctrl v ref - ctrl v cc v i ih input high current 300 a i il input low current -300 a v th threshold input vol t age voltage applied to pin (v ee = 0v) 1.4 v cc /2 2.6 v notes: 8. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been established. 500lfpm airflow. t j < 125 c.
micrel, inc. sy58626l june 2007 10 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 ac electrical characteristics (9) v cc = 3.3v 10%; v ee = 0v; t a = 0c to + 70c; r l = 100 ? across output pair; unless otherwise stated. symbol parameter condition min typ max units freq data rate throug hput (txq) 1.5v pk o utput s wing, no pre - emphasis dc 6.4 gbps 400mv o utput s wing, 33% pre - emphasis dc 6.4 data rate throughput (txlbq) 400mv o utput s wing dc 6.4 gbps t pd differential propagation delay txin -to - txq (v in >200mv pk ) 150 250 450 ps rxlbin -to - txq 250 ps t pd tempco differential propagation delay te m perature coefficient 120 fs/ o c t en txq enable/disable time /txen 600 ps t lb_en txlbq enable/disable time /txlben 200 ps t shd n txq shutdown time /txq_shdn high -to - low (txq outputs shutdown) 3 4.5 ns /txq_shdn low -to - high (txq outputs on) 3 4.5 t lbsel loopback select time lbsel 350 600 ps t prog programming logic control time 3 - bit pre- emphasis magnitude, 2 - bit dura tion co n trol update -to - valid txq 1 ns mag_ctrl pre - emphasis magnitude (percent beyond base swing) mag_ctrl (2,1,0) (0,0,0) 10 % (0,0,1) 15 (0,1,0) 25 (0,1,1) 33 (1,x,x) 0 dur_ctrl pre - emphasis duration dur_ctrl (1,0) minimum ( s hortest) 60 ps medium - short 100 medium - long 200 longest 400 t skew part -to - part skew note 10 200 ps t jitter random jitter (rj) note 11, 13, 14, 15 1 p s deterministic jitter (dj) note 12, 13, 14, 15 1 5 ps t r, t f output ris e/fall time (20% to 80%) at full output swing 20 50 80 ps notes: 9. high - frequency ac - parameters are guaranteed by design and characterization. 10. part - to - part skew is defined for two parts with identical power supply voltages at the same temperature and with n o skew of the edges at the respective inputs. 11. this jitter is the rms difference between the rj measured at the end of a 9in fr4 transmission line driven by the sy58626 and the signal source. 12. this jitter is a difference between the dj measured at the end of a 9in fr4 transmission path driven by an sy58626 and the signal source. 13. pe mag: 010 and pe dur: 10. 14. the typical jitter is measured at 4.25gbps and 6.4gbps using prbs 2 7 pattern and 4.25gbps using k28.5 pattern. 15. the transmission line is differential 6mil f r4 stripline with 10 0 differential impedance.
micrel, inc. sy58626l june 2007 11 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 detailed description the sy58626l is a high speed, low jitter transmit buffer with integrated loopback capability. adjustable pre - emphasis amplitudes and selectable pre - emphasis durations are included with the transmitter. the sy58626l also includes disable and shutdown control for the transmitter output. transmitter the sy58626l transmitter includes the vttin and vttout pin for maximum interface flexibility and dc - offset capability for the input and outpu t, respectively. this feature allows for interfacing with different logic families without the use of ac - coupling. the output buffer has internal 50 ? source terminated cml outputs for minimizing round - trip reflections. figure 1. variable output swing circuit transmitter variable - swing output buffer ? connecting vref - ctrl to txvctrl sets the transmitter output buffer to max swing 1.5v pk (3.0v pp ). ? conn ecting vcc to txvctrl sets the transmitter output buffer to minimum swing 100mv pk (200mv pp ). ? connecting vref - fixed to txvctrl sets the transmitter output buffer to 400mv pk (800mv pp ). ? control of the transmitter output swing buffer can be obtained by using a variable resistor connected between vref - ctrl and vcc with the wiper driving txvctrl. please refer to figure 1 for more details. transmitter disable and shutdown the sy58626l provides two methods to turn off the output when desired. when /txen is pulled high, the transmitter output pair is disabled. txq goes to a low state and /txq goes to a high state. when /txqshdn is pulled low, the transmitter output pair is in shutdown mode. txq and /txq output currents are shut off and the txq and /txq outputs are set to the same potential. the threshold for the /txen and /txqshdn pins is set with the vth pin. please refer to the ?typical operating characteristics? for more details. loopback the sy58626l features a loopback test mode, activated by setting lbsel to l ogic high. using the sy58626l with the sy58627l enables local loopback and link side loopback, shown in figures 2b and 2c. this mode enables an external loopback path, bypassing circuitry on both local and link side. please refer to table 1 and figure 3 fo r loopback control information. figure 2a. normal operation
micrel, inc. sy58626l june 2007 12 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 figure 2b. local loopback mode figure 2c. link s ide loopback mode txlb txlbenb txenb txq txlbq normal mode 0 0 0 txin txin 0 0 1 0 txin 0 1 0 txin 0 0 1 1 0 0 link side loopb ack mode 1 0 0 rxlbin txin 1 0 1 0 txin 1 1 0 rxlbin 0 1 1 1 0 0 table 1. transmit loopback control signal figure 3. loopback control pin
micrel, inc. sy58626l june 2007 13 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics v cc = 3.3v 10%; v in > 400mv; t a = 25c, r l = 100 ? across output pair; un less otherwise stated.
micrel, inc. sy58626l june 2007 14 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics (continued) v cc = 3.3v 10%; v in > 400mv; t a = 25c, r l = 100 ? across output pair; unless otherwise stated. output disable output shutdown time ( 250n s/div.) time (250ns/div.) high low low high / txq txq /txen low high txq /txq /txqshdn
micrel, inc. sy58626l june 2007 15 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 single- ended and dif ferential swings figure 4a. single - ended voltage swing figure 4b. differential voltage swing input and output stages figure 5a. simplified differential input stage figure 5b. simplified differential output stage
micrel, inc. sy58626l june 2007 16 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 input interface application s figure 6a. lvpecl interface (dc - coupled) figure 6b. lvpecl interface (ac - coupled) option: may connect vttin to vcc figure 6c. cml interface (dc - coupled) figure 6d. cml interface (ac - coupled) figure 6e. lvds interface (dc - coupled)
micrel, inc. sy58626l june 2007 17 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 cml output interface applications figure 7a. cml dc - coupled termination figure 7b. cml dc - coupled termination figure 7c. cml ac - coupled termination related product and support information part number function dat as heet link sy58627l dc-to - 6.4gbps backplane receive buffer with 4- stage programmable equalization and dc - offset control www.micrel.com/product - info/products/sy58627u.shtml hbw solutions new products and applications www.micrel.com/product - info/products/solutions.sht ml
micrel, inc. sy58626l june 2007 18 m9999 - 061207-c hbwhelp@micrel.com or (408) 955 - 1690 package information 32- pin qfn package notes: 1. package meets level 2 moisture sensitivity classification. 2. all parts are dry - packed before shipment. 3. exposed pad must be soldered to a ground for proper thermal management. micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 08 00 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 of a product can reasonably be expected to result i n 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 res ult 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 resulting from such use or sale. ? 2005 micrel, incorporated.


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