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general description the max3787 is a 1gbps to 12.5gbps equalization network that compensates for transmission medium loss- es encountered with fr4 and cables. the equalization network is composed entirely of passive components and functions equally well for 8b/10b or scrambled sig- nals. it is packaged in a small 1.5mm x 1.5mm chip- scale package (ucsp) that can be placed anywhere along the transmission medium to increase jitter margin for high-speed interconnects. roughly the size of two 0603 components, the max3787 easily provides place- ment and routing flexibility. at 8.5gbps, the max3787 compensates for spans up to 18in of fr4 and 7m of cable. at 12.5gbps, the max3787 compensates for spans up to 12in of fr4 and 3m of cable. input and output impedance is 100 differential. the max3787 requires no power and operates over a -40? to +125? temperature range. applications backplane interconnect compensation cable interconnect compensation chip-to-chip link extensions ethernet and fibre-channel serial modules chassis life extension features ? no power supply required ? small 1.5mm x 1.5mm chip-scale package ? passive equalization reduces isi ? operates from 1gbps to 12.5gbps ? extends board link ? extends cable link ? coding independent, 8b/10b or scrambled max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables ________________________________________________________________ maxim integrated products 1 19-0406; rev 2; 2/08 evaluation kit available b a c 2 1 3 ucsp/wlp top view in- out- in+ out+ max3787 pin configuration ordering information part temp range pin- package pkg code MAX3787ABL -40c to +125c 4 ucsp b9-7 max3787awl+ -40c to +125c 4 wlp w91b1+3 ucsp is a trademark of maxim integrated products, inc. typical application circuits continued at end of data sheet. max3787 line card all passive backplane interconnect switch card in+ out+ tx out- in- rx (100 ) (100 ) max3787 out+ in+ rx in- out- tx (100 ) (100 ) 100 fr4 100 fr4 typical application circuits + denotes a lead-free package. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com.
max3787 2 _______________________________________________________________________________________ electrical characteristics (specifications guaranteed over specified operating conditions. typical values measured at t a = +25?.) parameter sym b o l conditions min typ max units supply current 0.0 ma input swing measured differentially at point a in figure 1 3600 mv p-p compensation 5ghz relative to 100mhz 6 db input impedance differential, z load = 100 100 output impedance differential, z source = 100 100 through response relative to ideal load, see figure 2 for setup see figure 3 for limits input return loss 100mhz to 6ghz 15 db output return loss 100mhz to 6ghz 15 db resistance in+ to in- and out+ to out- no load, high impedance on all ports 112 152 resistance in+ to out+ and in- to out- no load, high impedance on all ports 32 44 resistance in+ to out- and in- to out+ no load, high impedance on all ports 112 152 dc gain (out/in) z load = 100 0.5 3.125gbps and 6.25gbps, 18in of 6mil microstrip fr4 0.05 residual deterministic jitter (table 1, notes 1, 2) 8.5gbps, 10.0gbps, and 12.5gbps, 18in of 6mil microstrip fr4 0.10 ui note 1: signal applied differentially at point a as shown in figure 1. the deterministic jitter at point b is from media-induced loss, not from clock-source modulation. deterministic jitter is measured at the 50% vertical level of the signal at point c. note 2: difference in deterministic jitter between reference points a and c in figure 1. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 27 prbs, 100 ones, 0, 1, 0, 1. 1gbps to 12.5gbps passive equalizer for backplanes and cables absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage between (in+ and out+) or (in- and out-) ..............+2v voltage between (in+ and in-) or (out+ and out-) ..............+4v voltage between (in+ and out-) or (in- and out+) ..............+4v continuous power dissipation (t a = +70?) 4-bump ucsp (derate 3.0mw/? above +70?) .........238mw operating junction temperature........................................+150? storage ambient temperature range .................-55? to +150? operating conditions parameter sym b o l conditions min typ max units operating ambient temperature t a -40 +25 +125 ? bit rate nrz data 1 12.5 gbps cid tolerance consecutive identical digits 100 bits
max3787 signal source max3787 fr4 test board 0in l 18in a b c oscilloscope rogers 4350 board see table 1 for pcb parameters. represents edge-mounted sma connector. figure 1. residual deterministic jitter test circuit vna source max3787 rogers 4350 board 1in dual 50 microstrip line vna detector represents edge-mounted sma connector. 1in dual 50 microstrip line figure 2. frequency response test circuit using vector network analyzer (vna) 1gbps to 12.5gbps passive equalizer for backplanes and cables _______________________________________________________________________________________ 3
max3787 4 _______________________________________________________________________________________ 1gbps to 12.5gbps passive equalizer for backplanes and cables through-response limits (relative to ideal load) frequency (ghz) s21 (db) 9 8 67 2345 1 -8 -7 -6 -5 -4 -3 -2 -1 0 -9 010 min typ max figure 3. through response limits table 1. pcb assumptions (board material is fr4) parameter conditions min typ max units transmission line edge-coupled microstrip line 6 mil relative permittivity at 1ghz fr4 or similar 4.0 loss tangent fr4 or similar 0.02 metal thickness 1oz copper 1.4 mil impedance differential 90 100 110 frequency min (db) typ (db) max (db) 100mhz -8.2 -7.4 -6.8 200mhz -7.9 -7.0 -6.4 300mhz -7.5 -6.6 -6.0 500mhz -6.8 -6.0 -5.3 1.0ghz -5.5 -4.8 -4.2 2.0ghz -4.2 -3.2 -2.5 3.0ghz -3.1 -2.2 -1.5 4.0ghz -2.3 -1.5 -0.8 5.0ghz -2.1 -1.3 -0.5 5.5ghz -2.4 -1.6 -0.6 6.0ghz -2.9 -2.1 -1.1 6.5ghz -2.6 7.0ghz -3.1 7.5ghz -3.6 8.0ghz -4.1 8.5ghz -4.7 9.0ghz -5.5 9.5ghz -7.0 10.0ghz -9.0
max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables _______________________________________________________________________________________ 5 eye diagram of unequalized signal (18in fr4, 12.5gbps, stress pattern) max3787toc04 120mv/div 14ps/div eye diagram of equalized signal (18in fr4, 12.5gbps, stress pattern) max3787toc05 120mv/div 14ps/div eye diagram of equalized signal (zoom) (18in fr4, 12.5gbps, stress pattern) max3787toc06 50mv/div 14ps/div eye diagram of unequalized signal (12in fr4, 12.5gbps, stress pattern) max3787toc07 120mv/div 14ps/div eye diagram of equalized signal (12in fr4, 12.5gbps, stress pattern) max3787toc08 120mv/div 14ps/div eye diagram of equalized signal (zoom) (12in fr4, 12.5gbps, stress pattern) max3787toc09 60mv/div 14ps/div typical operating characteristics (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan . deterministic jitter of the system was subtracted from the measured value. eye diagrams acquired by framescan include deterministic jitter of the syste m (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.) 0 200 100 400 300 600 500 700 900 800 1000 0101520 5 253035 45 40 50 vertical eye opening vs. length (4.25gbps, stress pattern) max3787toc01 fr4 board length (in) vertical eye opening (mv p-p ) without equalizer with equalizer 0 200 100 400 300 600 500 700 900 800 0101520 5 25303540 vertical eye opening vs. length (8.5gbps, stress pattern) max3787toc02 fr4 board length (in) vertical eye opening (mv p-p ) without equalizer with equalizer 0 200 100 400 300 600 500 700 900 800 0101520 5 25303540 vertical eye opening vs. length (10.3125gbps, stress pattern) max3787toc03 fr4 board length (in) vertical eye opening (mv p-p ) without equalizer with equalizer framescan is a registered trademark of tektronix. spectra-strip and skewclear are registered trademarks of amphenol.
max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables 6 _______________________________________________________________________________________ eye diagram of unequalized signal (18in fr4, 8.5gbps, stress pattern) max3787toc16 120mv/div 22ps/div eye diagram of equalized signal (18in fr4, 8.5gbps, stress pattern) max3787toc17 120mv/div 22ps/div eye diagram of equalized signal (zoom) (18in fr4, 8.5gbps, stress pattern) max3787toc18 50mv/div 22ps/div eye diagram of unequalized signal (18in fr4, 10.3125gbps, stress pattern) max3787toc10 120mv/div 18ps/div eye diagram of equalized signal (18in fr4, 10.3125gbps, stress pattern) maxt3787toc11 120mv/div 18ps/div eye diagram of equalized signal (zoom) (18in fr4, 10.3125gbps, stress pattern) max3787toc12 50mv/div 18ps/div eye diagram of unequalized signal (12in fr4, 10.3125gbps, stress pattern) max3787toc13 120mv/div 18ps/div eye diagram of equalized signal (12in fr4, 10.3125gbps, stress pattern) max3787toc14 18ps/div 120mv/div eye diagram of equalized signal (zoom) (12in fr4, 10.3125gbps, stress pattern) max3787toc15 60mv/div 18ps/div typical operating characteristics (continued) (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan. deterministic jitte r of the system was subtracted from the measured value. eye diagrams acquired by framescan include deterministic jitter of the syste m (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.)
max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables _______________________________________________________________________________________ 7 eye diagram of unequalized signal (12in fr4, 8.5gbps, stress pattern) max3787toc19 120mv/div 22ps/div eye diagram of equalized signal (12in fr4, 8.5gbps, stress pattern) max3787toc20 120mv/div 22ps/div eye diagram of equalized signal (zoom) (12in fr4, 8.5gbps, stress pattern) max3787toc21 60mv/div 22ps/div eye diagram of unequalized signal (18in fr4, 6.25gbps, stress pattern) max3787toc22 120mv/div 28ps/div eye diagram of equalized signal (18in fr4, 6.25gbps, stress pattern) max3787toc23 120mv/div 28ps/div eye diagram of equalized signal (zoom) (18in fr4, 6.25gbps, stress pattern) max3787toc24 50mv/div 28ps/div typical operating characteristics (continued) (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan. deterministic jitte r of the system was subtracted from the measured value. eye diagrams acquired by framescan include deterministic jitter of the syste m (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.) eye diagram of unequalized signal (12in fr4, 6.25gbps, stress pattern) max3787toc25 120mv/div 28ps/div eye diagram of equalized signal (zoom) (12in fr4, 6.25gbps, stress pattern) max3787toc27 60mv/div 28ps/div eye diagram of equalized signal (12in fr4, 6.25gbps, stress pattern) max3787toc26 28ps/div 120mv/div
max3787 8 _______________________________________________________________________________________ 1gbps to 12.5gbps passive equalizer for backplanes and cables eye diagram of unequalized signal (5m twin-ax cable, 10.3125gbps, stress pattern) max3787toc34 120mv/div 18ps/div eye diagram of equalized signal (zoom) (5m twin-ax cable, 10.3125gbps, stress pattern) max3787toc36 50mv/div 18ps/div eye diagram of equalized signal (5m twin-ax cable, 10.3125gbps, stress pattern) max3787toc35 120mv/div 18ps/div eye diagram of unequalized signal (18in fr4, 4.25gbps, stress pattern) max3787toc28 120mv/div 40ps/div eye diagram of equalized signal (18in fr4, 4.25gbps, stress pattern) max3787toc29 120mv/div 40ps/div eye diagram of equalized signal (zoom) (18in fr4, 4.25gbps, stress pattern) max3787toc30 40ps/div 50mv/div eye diagram of unequalized signal (12in fr4, 4.25gbps, stress pattern) max3787toc31 120mv/div 40ps/div eye diagram of equalized signal (12in fr4, 4.25gbps, stress pattern) max3787toc32 120mv/div 40ps/div eye diagram of equalized signal (zoom) (12in fr4, 4.25gbps, stress pattern) max3787toc33 60mv/div 40ps/div typical operating characteristics (continued) (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan. deterministic jitte r of the system was subtracted from the measured value. eye diagrams acquired by framescan include deterministic jitter of the syste m (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.)
max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables _______________________________________________________________________________________ 9 eye diagram of unequalized signal (3m twin-ax cable, 10.3125gbps, stress pattern) max3787toc37 120mv/div 18ps/div eye diagram of equalized signal (3m twin-ax cable, 10.3125gbps, stress pattern) max3787toc38 120mv/div 18ps/div eye diagram of equalized signal (zoom) (3m twin-ax cable, 10.3125gbps, stress pattern) max3787toc39 60mv/div 18ps/div eye diagram of unequalized signal (7m twin-ax cable, 8.5gbps, stress pattern) max3787toc40 120mv/div 22ps/div eye diagram of equalized signal (7m twin-ax cable, 8.5gbps, stress pattern) max3787toc41 120mv/div 22ps/div eye diagram of equalized signal (zoom) (7m twin-ax cable, 8.5gbps, stress pattern) max3787toc42 50mv/div 22ps/div typical operating characteristics (continued) (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan. deterministic jitte r of the system was subtracted from the measured value. eye diagrams acquired by framescan which include deterministic jitter of the sys- tem (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.) eye diagram of unequalized signal (5m twin-ax cable, 8.5gbps, stress pattern) max3787toc43 120mv//div 22ps/div eye diagram of equalized signal (zoom) (5m twin-ax cable, 8.5gbps, stress pattern) max3787toc45 50mv/div 22ps/div eye diagram of equalized signal (5m twin-ax cable, 8.5gbps, stress pattern) max3787toc44 120mv//div 22ps/div
max3787 10 ______________________________________________________________________________________ 1gbps to 12.5gbps passive equalizer for backplanes and cables eye diagram of unequalized signal (7m twin-ax cable, 4.25gbps, stress pattern) max3787toc46 120mv/div 40ps/div eye diagram of equalized signal (7m twin-ax cable, 4.25gbps, stress pattern) max3787toc47 120mv/div 40ps/div eye diagram of equalized signal (zoom) (7m twin-ax cable, 4.25gbps, stress pattern) 50mv/div 40ps/div max3787toc48 eye diagram of unequalized signal (5m twin-ax cable, 4.25gbps, stress pattern) 120mv/div 40ps/div max3787toc49 eye diagram of equalized signal (5m twin-ax cable, 4.25gbps, stress pattern) 120mv/div 40ps/div max3787toc50 eye diagram of equalized signal (zoom) (5m twin-ax cable, 4.25gbps, stress pattern) 50mv/div 40ps/div max3787toc51 typical operating characteristics (continued) (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan. deterministic jitte r of the system was subtracted from the measured value. eye diagrams acquired by framescan include deterministic jitter of the syste m (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.) eye diagram of equalized signal (0in fr4, 1gbps, stress pattern) 100mv/div 160ps/div max3787toc52 eye diagram of equalized signal (0in fr4, 5gbps, stress pattern) 100mv/div 34ps/div max3787toc53 eye diagram of equalized signal (0in fr4, 10gbps, stress pattern) 100mv/div 18ps/div max3787toc54
max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables ______________________________________________________________________________________ 11 -30 -15 -20 -25 -10 -5 0 04 3 12 5678910 differential s11 vs. frequency max3787toc55 frequency (ghz) differential s11 (db) -5 -7 -9 -3 -1 -6 -8 -10 -4 -2 0 04 3 12 5678910 differential s21 vs. frequency max3787toc57 frequency (ghz) differential s21 (db) 0 10 5 20 15 25 30 530 residual deterministic jitter vs. fr4 board length max3787toc58 fr4 board length (in) residual deterministic jitter (ps) 15 10 20 25 stress pattern 4.25gbps 3.125gbps 2.125gbps 1gbps 0 10 5 20 15 25 30 530 residual deterministic jitter vs. fr4 board length max3787toc5 9 fr4 board length (in) residual deterministic jitter (ps) 15 10 20 25 stress pattern 12.5gbps 10.3125gbps 8.5gbps 6.25gbps 0 10 5 20 15 25 30 530 residual deterministic jitter vs. fr4 board length max3787toc60 fr4 board length (in) residual deterministic jitter (ps) 15 10 20 25 rpat pattern 4.25gbps 3.125gbps 2.125gbps 1gbps 0 10 5 20 15 25 30 530 residual deterministic jitter vs. fr4 board length max3787toc61 fr4 board length (in) residual deterministic jitter (ps) 15 10 20 25 rpat pattern 12.5gbps 10.3125gbps 8.5gbps 6.25gbps -30 -15 -20 -25 -10 -5 0 04 3 12 5678910 differential s22 vs. frequency max3787toc56 frequency (ghz) differential s22 (db) typical operating characteristics (continued) (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan. deterministic jitte r of the system was subtracted from the measured value. eye diagrams acquired by framescan include deterministic jitter of the syste m (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.)
max3787 12 ______________________________________________________________________________________ 1gbps to 12.5gbps passive equalizer for backplanes and cables 0 10 5 20 15 25 30 17 residual deterministic jitter vs. twin-ax cable length max3787toc64 twin-ax cable length (m) residual deterministic jitter (ps) 3 2456 rpat pattern 4.25gbps 3.125gbps 2.125gbps 1gbps 0 10 5 20 15 25 30 17 residual deterministic jitter vs. twin-ax cable length max3787toc65 twin-ax cable length (m) residual deterministic jitter (ps) 3 2456 rpat pattern 6.25gbps 8.5gbps 12.5gbps 10.3125gbps typical operating characteristics (continued) (t a = +25?, unless otherwise noted. all measurements were done with 1v p-p at the source. stress pattern: 2 7 prbs, 100 zeros, 1, 0, 1, 0, 2 7 prbs, 100 ones, 0, 1, 0, 1. residual deterministic jitter graphs were measured using tektronix? framescan. deterministic jitte r of the system was subtracted from the measured value. eye diagrams acquired by framescan include deterministic jitter of the syste m (approximately 9ps) but not random jitter. twin-ax cable: amphenol spectra-strip skewclear 100 24awg.) 0 10 5 20 15 25 30 17 residual deterministic jitter vs. twin-ax cable length max3787toc62 twin-ax cable length (m) residual deterministic jitter (ps) 3 2456 stress pattern 4.25gbps 3.125gbps 2.125gbps 1gbps 0 10 5 20 15 25 30 17 residual deterministic jitter vs. twin-ax cable length max3787toc63 twin-ax cable length (m) residual deterministic jitter (ps) 3 2456 stress pattern 12.5gbps 10.3125gbps 8.5gbps 6.25gbps
max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables ______________________________________________________________________________________ 13 detailed description the max3787 is an entirely passive network composed of both resistive and reactive components (figure 4). two symmetric-t networks with bypassing for high- pass characteristics are used to create a differential symmetric-h network. the entire network acts as a filter specifically tuned to compensate for transmission medi- um losses encountered with fr4 and cables. input and output terminations the max3787 input impedance is 100 differential with the output connected to a 100 differential load. the network is designed for 100 -balanced differential sig- nals and is not intended for single-ended transmission. esd protection diodes the max3787 contains esd diodes that bypass the equalization network in case of static discharge (figure 5). applications information equalizer integration and placement the max3787 is packaged in a small 1.5mm x 1.5mm ucsp that can be placed anywhere along the transmis- sion medium. the small size allows placement and routing flexibility. due to the symmetry of the equalization network, sig- nals can pass from in to out or out to in with the same compensation. the equalizer can also be placed at the beginning or end of the transmission medium and provide the same compensation at the receiving circuit. for example, two equalizers can be placed in one transceiver module, one for the transmit path and one for the receive path (see typical application circuits ). ucsp assembly considerations for the latest application details on ucsp construction, dimensions, tape carrier information, pcb techniques, bump-pad layout, and recommended reflow tempera- ture profile, as well as the latest information on reliability testing results, refer to application note 1891: ucsp? wafer-level chip-scale package available on maxim? website at www.maxim-ic.com/ucsp . chip information transistor count: 0 process: sige bipolar pin description pin name function a1 in+ positive data input a3 out+ positive data output c1 in- negative data input c3 out- negative data output out- in- out+ max3787 z 2 at 0hz (dc) z 1 = open, z 2 = 0 in+ z 1 z 1 figure 4. functional diagram out- out+ in+ equalization network esd diodes esd diodes in- max3787 figure 5. esd protection diodes
max3787 14 ______________________________________________________________________________________ 1gbps to 12.5gbps passive equalizer for backplanes and cables max3787 tx rx (100 ) (100 ) max3787 rx tx (100 ) (100 ) fibre-channel host bus adapter all passive copper-cable assembly fibre-channel fabric switch eq 100 24awg twin-ax cable eq 100 24awg twin-ax cable typical application circuits (continued) package information (for the latest package outline information, go to www.maxim-ic.com/packages .) package type package code document no. 4 ucsp b9-7 21-0093 4 wlp w91b1+3 21-0067
max3787 1gbps to 12.5gbps passive equalizer for backplanes and cables maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 7/05 initial release. 1 12/05 added lead-free package to ordering information table. 1 2 2/08 in the ordering information table, changed lead-free part number from abl+ to awl+; added wlp package information. 1, 14

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