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general description the MAX4887 triple, high-frequency switch is intended for notebooks and monitors to permit rgb signals to be switched from one driver to one of two loads (1:2) or one of two sources to be connected to one load (2:1). the MAX4887 high-performance switch utilizes n-channel architecture with internal high-drive pullup from a low- noise charge pump, resulting in very low on-capacitance. the MAX4887 features 5 ? (typ) on-resistance switches with 10pf on-capacitances for routing rgb video sig- nals. a logic input enables or disables the internal charge pump for optimal frequency performances when operating at lower input voltages resulting in standby supply current less than 3?. all rgb inputs/outputs are esd protected to ?kv human body model (hbm) and feature a global input ( en ) that places all inputs and out- puts in a high-impedance state. the MAX4887 is available in a small 3mm x 3mm, 16- pin tqfn package for ease of assembly and flowthrough layout, resulting in minimum space require- ment and simplicity in board layout. the MAX4887 operates over the -40? to +85? temperature range. applications notebook computers servers and routers docking stations pc/hdtv monitors features ? +3v/+5v single-supply operation ? low r on 5 ? (v+ = 5v) ? low 10pf (typ) c on ? global enable input to turn on/off switches ? break-before-make switching ? ?kv hbm esd protection per iec1000-4-2 on i/os ? less than 1ma supply current (charge pump enabled) ? less than 3? standby mode ? charge-pump noise lower than 163? p-p ? flowthrough layout for easy board layout ? space-saving lead-free (3mm x 3mm) 16-pin tqfn package MAX4887 t riple video switch ________________________________________________________________ maxim integrated products 1 19-3972; rev 0; 2/06 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information vga d/a converter v cc v+ gnd +3.3v +5v en sel r0 g0 b0 0.1 f vga connector 1 docking station r2 g2 b2 r1 g1 b1 qp from control signals 75 ? 75 ? 75 ? vga connector 2 MAX4887 t ypical operating circuit part temp range pin- package top mark pkg code MAX4887ete -40? to +85? 16 tqfn-ep* 3mm x 3mm aef t1633-4 * ep = exposed paddle. the MAX4887 is available only in a lead-free package. specify lead-free by adding the + symbol at the end of the part num- ber when ordering.
MAX4887 t riple video switch 2 _______________________________________________________________________________________ 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. (all voltages referenced to gnd.) v+ .............................................................................-0.3v to +6v r_, g_, b_, sel, qp , en (note 1) ................-0.3v to (v+ + 0.3v) continuous current through any switch ........................?20ma peak current through any switch (pulsed at 1ms, 10% duty cycle).................................?40ma continuous power dissipation (t a = +70?) 16-pin thin qfn-ep (derate 15.6mw/? above +70?).........................................................................1250mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? dc electrical characteristics?v supply (v+ = 5v, qp = gnd, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units power-supply voltage range 4.5 5.5 v qp = gnd 0.5 1 ma quiescent supply current i + v+ = +5.5v qp = v+ 1 3 ? rgb switches qp = gnd 5 6.5 on-resistance r on v in = +1.5v, i in = -25ma qp = v+ 6 7.5 ? qp = gnd 0.5 1.3 on-resistance matching ? r on 0.3v < v in < +2v, i in = -25ma (note 3) qp = v+ 0.7 1.5 ? qp = gnd 0.5 1 0 < v in < +2v, i in = -25ma qp = v+ 0.7 1.8 on-resistance flatness r flat ( on ) 0 < v in < +1.5v, i in = -25ma qp =v+ 0.7 1.55 ? on-leakage current i l(on) r_, g_, b_ = 0.7v, 4.8v; en = gnd -1 +1 ? off-leakage current i l(off) r_, g_, b_ = 0.7v, 4.8v; en = gnd 300 pa logic inputs (sel, en , qp ) v+ = 4.5v 0.8 input low voltage v il v+ = 5.5v 0.8 v v+ = 4.5v 2.0 input high voltage v ih v+ = 5.5v 2.0 v input leakage current i leak -1 +1 ? esd protection human body model, r_, g_, b_ ? esd protection human body model, sel, en , qp ? kv note 1: signals exceeding v+ or gnd are clamped by internal diodes. limit forward-diode current to maximum current rating.
MAX4887 t riple video switch _______________________________________________________________________________________ 3 ac electrical characteristics?v supply (v+ = +5v, qp = gnd, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units charge-pump noise v qp r s = r l = 50 ? 163 ? p-p turn-on time t on v in = +4.5v, r l = 100 ? , figure 2 20 s charge injection v ge n = 0v , r ge n = 0 ? , c l = 1.0nf, fi g ur e 3 28 pc propagation delay t plh /t phl c l = 10p f, r s = r l = 50 ? , fi g ur e 4 (note 3) 400 ps output skew between ports t skew skew between any two ports: r, g, b; figure 4 (note 3) 350 ps 3db bandwidth f max r s = r l = 50 ? , figure 6 500 mhz off-isolation r s = r l = 50 ? , v in _ = 1v p-p, f = 50mhz, figure 5 -58 db qp = gnd 0.5 insertion loss i los 1mhz < f < 50mhz, r s = r l = 50 ? qp = v+ 0.5 db crosstalk v ct f < 50mhz, v in = 1v p-p , r s = r l = 50 ? , figure 5 -40 db off-capacitance c off f = 1mhz, (r,g,b) 0 to (r,g,b) 1,2 6pf on-capacitance c on f = 1mhz 10 pf electrical characteristics?.3v supply (v+ = +3.3v, qp = gnd, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units power-supply voltage range 3.0 3.6 v quiescent supply current i + v+ = +3.6v 0.5 1 ma rgb switches on-resistance r on v = +3v, v in = +1.5v, i in = -25ma 6 7 ? on-resistance matching ? r on 0 < v in < +2v, i in = -25ma (note 3) 0.8 1.2 ? on-resistance flatness r flat ( on ) 0< v in < +2v, i in = -25ma 0.9 1.4 ? on-leakage current i l(on) r_, g_, b_ = 0v or +3.6v, en = gnd -1 +1 ? off-leakage current i l(off) r_, g_, b_ = 0v or +3.6v, en = v+ 200 pa logic inputs (sel, en , qp ) v+ = 3.0v 0.8 input low voltage v il v+ = 3.6v 0.8 v v+ = 3.0v 2.0 input high voltage v ih v+ = 3.6v 2.0 v input leakage current i leak -1 +1 ? esd protection human body model, r_, g_, b_ ? esd protection human body model, sel, en , qp ? kv
MAX4887 t riple video switch 4 _______________________________________________________________________________________ ac electrical characteristics?.3v supply (v+ = +3.3v, qp = gnd, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units charge-pump noise v qp r s = r l = 50 ? 100 ? p-p turn-on time t on v in = +3v, r l = 100 ? , figure 2 25 s charge injection v gen = 0v, r gen = 0 ? , c l = 1.0nf, figure 3 21 pc propagation delay t phl /t plh c l = 10p f, r s = r l = 50 ? , fi g ur e 4 ( n ote 3) 400 ps output skew between ports t skew skew between any two ports: r, g, b, figure 5 (note 3) 350 ps 3db bandwidth f max r s = r l = 50 ? , figure 5 500 mhz insertion loss i los 1mhz < f < 50mhz, r s = r l = 50 ? 0.6 db crosstalk v ct f < 50mhz, r s = r l = 50 ? , figure 5 -40 db off-isolation r s = r l = 50 ? , v in _ = 1v p-p , f = 50mhz, figure 5 -55 db off-capacitance c off f = 1mhz, (r,g,b) 0 to (r,g,b) 1,2 6pf on-capacitance c on f = 1mhz 10 pf note 2: maximum and minimum limits over temperature are guaranteed by design and characterization. device is production tested at t a = +85?. note 3: guaranteed by design.
MAX4887 t riple video switch _______________________________________________________________________________________ 5 4.0 4.3 4.2 4.1 4.4 4.5 4.6 4.7 4.8 4.9 5.0 01.2 0.6 1.8 2.4 3.0 3.6 on-resistance vs. v+ MAX4887 toc01 v rgb (v) on-resistance ( ? ) v+ = 3v qp = low v+ = 3.3v v+ = 3.6v 0 2 1 5 4 3 6 7 9 8 10 00.6 0.9 0.3 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 on-resistance vs. v rgb MAX4887 toc02 v rgb (v) on-resistance ( ? ) t a = +85 c t a = +25 c t a = -40 c v+ = 3.3v qp = low 4.0 4.2 4.1 4.5 4.4 4.3 4.6 4.7 4.9 4.8 5.0 01.0 1.5 0.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 on-resistance vs. v+ MAX4887 toc03 v rgb (v) on-resistance ( ? ) qp = low v+ = 5.5v v+ = 4.5v v+ = 5v 01.01. 52.0 0.5 2.5 3.0 3.5 4.5 4.0 5.0 on-resistance vs. v rgb MAX4887 toc04 v rgb (v) 0 2 1 5 4 3 6 7 9 8 10 on-resistance ( ? ) t a = +85 c t a = +25 c t a = -40 c 0 12 6 30 24 18 36 42 54 48 60 0 1.0 1.5 0.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 on-resistance vs. v+ MAX4887 toc05 v rgb (v) on-resistance ( ? ) qp = high v+ = 5.5v v+ = 4.5v v+ = 5v 0 10 5 15 30 35 25 20 40 0 1.0 1.5 2.0 2.5 0.5 3.0 3.5 4.0 4.5 5.0 on-resistance vs. v rgb MAX4887 toc06 v rgb (v) on-resistance ( ? ) t a = +85 c t a = +25 c t a = -40 c 200 350 300 250 400 450 500 550 600 650 700 3.0 4.0 3.5 4.5 5.0 5.5 supply current vs. supply voltage MAX4887 toc07 v+ (v) supply current (na) qp = high 200 300 250 400 350 450 500 3.0 4.0 3.5 4.5 5.0 5.5 supply current vs. supply voltage MAX4887 toc08 v+ (v) supply current ( a) qp = low t a = +85 c t a = +25 c t a = -40 c 0.001 0.1 0.01 10 1 100 1000 -40 10 -15 35 60 85 rgb on/off-leakage current vs. temperature MAX4887 toc09 temperature ( c) leakage current (na) v+ = 5v on-leakage off-leakage t ypical operating characteristics (t a = +25?, unless otherwise noted.)
MAX4887 t riple video switch 6 _______________________________________________________________________________________ 0.001 0.1 0.01 10 1 100 -40 10 -15 35 60 85 rgb on/off-leakage current vs. temperature MAX4887 toc10 temperature ( c) leakage current (na) v+ = 3.3v on-leakage off-leakage 4.0 4.6 4.4 4.2 4.8 5.0 5.2 5.4 5.6 5.8 6.0 -40 10 -15 35 60 85 turn-on times vs. temperature MAX4887 toc11 temperature ( c) turn off times ( s) v+ = 3.3v v+ = 5v 0 20 10 40 30 50 60 -40 10 -15 35 60 85 turn-off times vs. temperature MAX4887 toc12 temperature ( c) turn-off times (ns) v+ = 3.3v v+ = 5v 130 145 140 135 150 155 160 165 170 175 180 -40 10 -15 35 60 85 propagation delay vs. temperature MAX4887 toc13 temperature ( c) propagation delay (ps) v+ = 3.3v v+ = 5v insertion loss vs. frequency MAX4887 toc14 frequency (mhz) insertion loss (db) 100 10 1 -4 -3 -2 -1 0 -5 0.1 1000 v+ = 3.3v insertion loss vs. frequency MAX4887 toc15 frequency (mhz) insertion loss (db) 100 10 1 -4 -3 -2 -1 0 -5 0.1 1000 v+ = 5v off-isolation/crosstalk vs. frequency MAX4887 toc16 frequency (mhz) off-isolation (db) 100 10 1 -100 -80 -60 -40 -20 0 -120 0.1 1000 crosstalk v+ = +3.3v off-isolation off-isolation/crosstalk vs. frequency MAX4887 toc17 frequency (mhz) off-isolation (db) 100 10 1 -100 -80 -60 -40 -20 0 -120 0.1 1000 crosstalk v+ = +5v off-isolation t ypical operating characteristics (continued) (t a = +25?, unless otherwise noted.)
detailed description the MAX4887 triple, high-frequency switch is intended for notebooks and monitors permitting rgb (red, green, blue) signals to be switched from one driver to one of two loads (1:2) or one of two sources to be con- nected to one load (2:1). the MAX4887 provides three spdt high-bandwidth switches to route standard vga r, g, and b signals (see table 1). a boosted gate-drive voltage is generated by an inter- nal charge pump to enhance the performance of the rgb switches. the MAX4887 high-performance switch utilizes n-channel architecture with internal high-drive pullup from a low-noise charge pump resulting in very low on-capacitance. the rgb switches function with reduced performance when the charge pump is dis- abled (v+ > 5v). the MAX4887? global input ( en ) places all inputs/outputs in a high-impedance state, providing rejection of all signals. the r_, g_, and b_ analog switches are identical, and any of the three switches can be used to route red, green, or blue video signals. all rgb inputs/outputs are esd protected to ?kv human body model (hbm). analog signal levels analog signal inputs over the full voltage range (0 to v+) are passed through the switch with minimal change in on-resistance ( qp = low). when qp = high, the switches can operate within 1v of v+. the switches are bidirectional; therefore, r_, g_, and b_ can be either inputs or outputs. MAX4887 t riple video switch _______________________________________________________________________________________ 7 pin description pin name function 1v + supply voltage input. bypass v+ to gnd with a 0.1? or larger ceramic capacitor. 2r 0 rgb input/output 3g 0 rgb input/output 4b 0 rgb input/output 5 gnd ground 6 en active-low enable input. drive en high to disable the MAX4887. all i/os are high impedance when the device is disabled. drive en low for normal operation. 7, 14 n.c. not internally connected 8r 1 rgb input/output 9g 1 rgb input/output 10 b1 rgb input/output 11 b2 rgb input/output 12 g2 rgb input/output 13 r2 rgb input/output 15 sel select input. logic input for switching rgb switches (see table 1). 16 qp active-low charge-pump enable. drive qp high to disable the internal charge pump (for v+ = 5v only). rgb switch operates with reduced performance when the charge pump is disabled. drive qp low for normal operation. ep ep exposed pad. connect exposed pad to ground plane. r0 sel r1 r2 en switch logic control charge pump qp g0 g1 g2 b0 b1 b2 MAX4887 figure 1. functional diagram
MAX4887 charge pump a low-noise charge pump with internal capacitors pro- vides a doubled voltage for driving the rgb analog switches when operating the MAX4887 at low voltages (v+ < 5v). the charge pump adds less than 163? p-p of noise to the switches. when operating with v+ = 5v, the charge pump can be disabled to further reduce noise; however, the analog switch? performance is slightly degraded resulting in higher r on and insertion loss. drive qp high to disable the charge pump. drive qp low for normal operation. when operating the MAX4887 at 3.3v, connect qp to gnd. logic inputs ( en , sel) the MAX4887 has two logic inputs that control the switch configuration and on/off function. use sel to switch (rgb) 0 to (rgb) 1 or (rgb) 2 . use en to connect the switch inputs to the outputs. drive en low to enable the rgb switches inputs/outputs. drive en high to place all inputs/outputs in a high-impedance state. table 1 illustrates the MAX4887 truth table. t riple video switch 8 _______________________________________________________________________________________ t r < 5ns t f < 5ns 50% 0v logic input r l r_, g_, b_ gnd c l includes fixture and stray capacitance. v out = v in ( r l ) r l + r on switch input sel v+ t off 0v ro, go, bo switch output 0.9 x v 0ut 0.9 x v 0ut t on v out switch output logic input logic input waveforms inverted for switches that have the opposite logic sense. v+ c l v+ v out v in MAX4887 figure 2. switching time v gen gnd c l v out v+ v out ? v out q = ( ? v out )(c l ) switch input on 0v v+ off off sel v+ r gen sel MAX4887 switch output logic input (0 to v+) ro, go, bo r_, g_, b_ figure 3. charge injection en sel function 00 (rgb) 0 to (rgb) 1 01 (rgb) 0 to (rgb) 2 1x r_, b_, and g_ high impedance table 1. switch truth table timing diagrams/test circuits
applications information power-supply bypassing and sequencing proper power-supply sequencing is recommended for all cmos devices. do not exceed the absolute maxi- mum ratings because stresses beyond the listed rat- ings can cause permanent damage to the device. always sequence v+ on first, followed by r_, g_, or b_ and the logic inputs. bypass v+ to ground with a 0.1? or larger ceramic capacitor as close to the device as possible. layout high-speed switches such as the MAX4887 require proper pc board layout for optimum performance. ensure that impedance-controlled pc board traces for high-speed signals are matched in length and as short as possible. connect the exposed paddle to a solid ground plane. esd protection as with all maxim devices, esd-protection structures are incorporated to protect against electrostatic dis- charges encountered during handling and assembly on all pins. additionally, the MAX4887 is protected to ?kv human body model (hbm) on all switches. human body model several esd testing standards exist for measuring the robustness of esd structures. the esd protection of the MAX4887 is characterized with the human body model. figure 6 shows the model used to simulate an esd event resulting from contact with the human body. the model consists of a 100pf storage capacitor that is charged to a high voltage, then discharged through a 1.5k ? resistor. figure 7 shows the current waveform when the storage capacitor is discharged into a low impedance. esd test conditions esd performance depends on a variety of conditions. please contact maxim for a reliability report document- ing test setup, methodology, and results. additional applications information figure 8 illustrates the MAX4887 being used in a laptop in a 2:1 configuration (one of two sources connected to a load). the switch assumes the dedicated dvd player chip outputs r, g, b video, and the MAX4887 switches between normal vga graphics and the dedicated dvd device. MAX4887 t riple video switch _______________________________________________________________________________________ 9 v+ gnd +5v en sel r _,b_,g_ 0.1 f r_, g_,b_ qp v in r_ 0.5 x v in b_ t phl1 0.5 x v out 50 ? trace 10pf 0.5 x v in v in 50 ? trace v out 0.5 x v in v in 0.5 x v out 0.5 x v in t plh2 t phl2 t plh1 r_ b_ t skew = t plh1 - t plh2 or t phl1 = t phl2 MAX4887 figure 4. propagation delay and skew measurement timing diagrams/test circuits (continued)
MAX4887 t riple video switch 10 ______________________________________________________________________________________ 50 ? trace (rgb) 0 r15 49.9 ? r13 49.9 ? r 0 g 0 50 ? trace 50 ? trace 50 ? trace (rgb) 1,2 (rgb) 0 (rgb) 1,2 r 1 g 1 r13 49.9 ? network analyzer 50 ? trace 50 ? trace network analyzer network analyzer network analyzer network analyzer network analyzer off-isolation crosstalk bandwidth MAX4887 figure 5. on-loss, off-isolation, and crosstalk charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m ? r d 1500 ? high- voltage dc source device under test figure 6. human body esd test model v+ gnd +5v en 0.1 f MAX4887 vga graphic generator dedicated dvd player chip sel vga r1 g1 b1 r2 g2 b2 from control line qp figure 8. the MAX4887 used in a 2:1 mux configuration i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amperes figure 7. hbm discharge current waveform
MAX4887 t riple video switch ______________________________________________________________________________________ 11 (3mm x 3mm) thin qfn *exposed paddle. connect to gnd. r2 16 1234 12 11 10 9 15 14 13 5 6 7 8 qp sel n.c. g2 b2 b1 g1 r0 g0 b0 gnd en n.c. r1 v+ MAX4887 top view *ep + pin configuration chip information process: bicmos
MAX4887 t riple video switch 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. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2006 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. boblet package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) 12x16l qfn thin.eps 0.10 c 0.08 c 0.10 m c a b d d/2 e/2 e a1 a2 a e2 e2/2 l k e (nd - 1) x e (ne - 1) x e d2 d2/2 b l e l c l e c l l c l c package outline 21-0136 2 1 g 8, 12, 16l thin qfn, 3x3x0.8mm marking aaaa exposed pad variations 1.10 t1633-1 0.95 codes pkg. t1233-1 min. 0.95 nom. 1.10 d2 1.25 1.10 0.95 1.25 nom. 1.10 max. 1.25 min. 0.95 max. 1.25 e2 12 n k a2 0.25 ne a1 nd 0 0.20 ref - - 3 0.02 3 0.05 l e e 0.45 2.90 b d a 0.20 2.90 0.70 0.50 bsc. 0.55 3.00 0.65 3.10 0.25 3.00 0.75 0.30 3.10 0.80 16 0.20 ref 0.25 - 0 4 0.02 4 - 0.05 0.50 bsc. 0.30 2.90 0.40 3.00 0.20 2.90 0.70 0.25 3.00 0.75 3.10 0.50 0.80 3.10 0.30 pkg ref. min. 12l 3x3 nom. max. nom. 16l 3x3 min. max. 0.35 x 45 pin id jedec weed-1 0.35 x 45 weed-2 t1233-3 1.10 1.25 0.95 1.10 0.35 x 45 1.25 weed-1 0.95 t1633f-3 0.65 t1633-4 0.95 0.80 0.95 0.65 0.80 1.10 1.25 0.95 1.10 0.225 x 45 0.95 weed-2 0.35 x 45 1.25 weed-2 t1633-2 0.95 1.10 1.25 0.95 1.10 0.35 x 45 1.25 weed-2 no down bonds allowed yes no yes n/a no package outline 21-0136 2 2 g 8, 12, 16l thin qfn, 3x3x0.8mm yes weed-1 1.25 1.10 0.95 0.35 x 45 1.25 1.10 0.95 t1233-4 t1633fh-3 0.65 0.80 0.95 0.225 x 45 0.65 0.80 0.95 weed-2 n/a notes: 1. dimensioning & tolerancing conform to asme y14.5m-1994. 2. all dimensions are in millimeters. angles are in degrees. 3. n is the total number of terminals. 4. the terminal #1 identifier and terminal numbering convention shall conform to jesd 95-1 spp-012. details of terminal #1 identifier are optional, but must be located within the zone indicated. the terminal #1 identifier may be either a mold or marked feature. 5. dimension b applies to metallized terminal and is measured between 0.20 mm and 0.25 mm from terminal tip. 6. nd and ne refer to the number of terminals on each d and e side respectively. 7. depopulation is possible in a symmetrical fashion. 8. coplanarity applies to the exposed heat sink slug as well as the terminals. 9. drawing conforms to jedec mo220 revision c. 10. marking is for package orientation reference only. 11. number of leads shown are for reference only. 0.25 0.30 0.35 2 0.25 0 0.20 ref -- 0.02 0.05 0.35 8 2 0.55 0.75 2.90 2.90 3.00 3.10 0.65 bsc. 3.00 3.10 8l 3x3 min. 0.70 0.75 0.80 nom. max. tq833-1 1.25 0.25 0.70 0.35 x 45 no weec 1.25 0.70 0.25

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