general description the MAX5427/max5428/max5429 linear-taper digital potentiometers function as mechanical potentiometers, but replace the mechanics with a simple 2-wire digital interface. these digital potentiometers are unique in that they have an optional one-time programmable feature that either sets the wiper? power-on reset (por) posi- tion to a user-defined value, or the wiper can be set and the interface disabled to prevent further adjustment. the MAX5427 has an end-to-end resistance of 100k ? , the max5428 a resistance of 50k ? , and the max5429 a resistance of 10k ? . all these devices have 32 wiper positions, operate from a single 2.7v to 5.5v supply, and use less than 1.5? (max) static supply current. the MAX5427/max5428/max5429 are available in 8-pin thin qfn and ?ax packages. each device is guaranteed over the extended temperature range of -40? to +85?. applications mechanical potentiometer replacement products using one-time factory calibration features ? wiper position stored after one-time fuse programming ? user-defined power-on reset position ? 35ppm/? end-to-end temperature coefficient and 5ppm/? ratiometric temperature coefficient ? 32 tap positions ? tiny 8-pin thin qfn and ?ax packages ? ultra-low 1.5? (max) static supply current ? 2.7v to 5.5v single-supply operation ? wiper position programmed through simple 2-wire serial interface ? 10k ? , 50k ? , and 100k ? end-to-end resistances MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers ________________________________________________________________ maxim integrated products 1 ordering information MAX5427 max5428 max5429 32- position decoder up/down counter one-time program block 8 h s 31 s 32 s 30 s 2 s 3 s 1 r 31 r 30 r w r 2 r 1 1 w 7 l 3 4 2 6 5 v dd v pp gnd cs u/d functional block diagram 19-2462; rev 2; 3/05 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. evaluation kit available part temp range pin-package r (k ? ) MAX5427 eua -40? to +85? 8 ?ax 100 MAX5427eta -40? to +85? 8 thin qfn-ep* 100 max5428 eua -40? to +85? 8 ?ax 50 max5428eta -40? to +85? 8 thin qfn-ep* 50 max5429 eua -40? to +85? 8 ?ax 10 max5429eta -40? to +85? 8 thin qfn-ep* 10 v pp gnd 1 2 8 7 h l v dd w max top view 3 4 6 5 MAX5427 max5428 max5429 cs u/d v pp gnd *exposed paddle. connected to gnd. 8 7 h l v dd w qfn 6 5 MAX5427 max5428 max5429 cs u/d 1 2 3 4 * * pin configurations * ep = exposed paddle. ?ax is a registered trademark of maxim integrated products, inc. www.datasheet.co.kr datasheet pdf - http://www..net/
MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v dd = 2.7v to 5.5v, v pp = gnd, v h = v dd , v l = gnd, t a = -40? to +85?, unless otherwise noted. typical values are at v dd = 5.0v, t a = +25?, unless otherwise noted.) (note 1) 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. v dd to gnd ...........................................................-0.3v to +6.0v v pp to gnd..........................................................-0.3v to +12.0v all other pins to gnd.................................-0.3v to (v dd + 0.3v) input and output latchup immunity...............................?00ma maximum continuous current into h, l, and w MAX5427 .................................................................?.5ma max5428 .................................................................?.5ma max5429 .................................................................?.0ma continuous power dissipation (t a = +70?) 8-pin ?ax (derate 4.5mw/? above +70?) .............362mw 8-pin qfn-ep (derate 24.4mw/? above +70?)......1951mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units dc performance resolution 32 taps MAX5427 75 100 125 max5428 37.5 50 62.5 end-to-end resistance max5429 7.5 10 12.5 k ? end-to-end resistance tempco tc r 35 ppm/? MAX5427/max5428 5 ratiometric resistance tempco max5429 10 ppm/? integral nonlinearity inl potentiometer configuration, no load, figure 1 ? lsb differential nonlinearity dnl potentiometer configuration, no load, figure 1 ? lsb full-scale error potentiometer configuration, no load, figure 1 -0.5 lsb zero-scale error potentiometer configuration, no load, figure 1 +0.5 lsb wiper resistance r w MAX5427 i w = 20?; max5428 i w = 40?; max5429 i w = 200? 100 240 ? digital inputs ( cs , u/ d ) input high voltage v ih 0.7 x v dd v input low voltage v il 0.3 x v dd v input current i in ?.1 1 a input capacitance c in 5pf timing characteristics (note 2) u/ d mode to cs setup t cu figures 2, 3 50 ns cs hold to u/ d mode t ci figures 2, 3 50 ns u/ d step hold to cs t ic figures 2, 3 0 ns u/ d step low time t il figures 2, 3 100 ns www.datasheet.co.kr datasheet pdf - http://www..net/
MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v dd = 2.7v to 5.5v, v pp = gnd, v h = v dd , v l = gnd, t a = -40? to +85?, unless otherwise noted. typical values are at v dd = 5.0v, t a = +25?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units u/ d step high time t ih figures 2, 3 100 ns wiper switching time t iw c l = 0pf, figures 2, 3 100 ns v pp rising edge to cs falling edge t pc figure 4 1 ms cs falling edge to v pp falling edge t cp figure 4 5 ms cs step low time t cl figure 4 5 ms cs step high time t ch figure 4 5 ms v pp falling edge to cs rising edge t ph figure 4 1 ms u/ d frequency f u/ d max 5 mhz power-up time t up (note 3) 1 ms 100k ? variable resistor configuration, c l = 10pf, figure 1 1 output settling time t settle 100k ? potentiometer configuration, c l = 10pf, figure 1 0.25 ? power supply supply voltage v dd 2.7 5.5 v static supply current i dd (note 4) 1.5 ? t a < +50? 10.45 11.55 programming voltage v pp t a +50? 11 11.55 v programming current i pp v pp = 11v 5 ma note 1: all devices are production tested at t a = +25? and are guaranteed by design for t a = -40? to +85?. note 2: digital timing is guaranteed by design, not production tested. note 3: power-up time is the period of time from when the power supply is applied until the serial interface is ready for writing. note 4: digital inputs cs and u/ d are connected to gnd or v dd . h l w potentiometer configuration variable-resistor configuration h l figure 1. potentiometer/variable-resistor configuration www.datasheet.co.kr datasheet pdf - http://www..net/
MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers 4 _______________________________________________________________________________________ typical operating characteristics (v dd = 5.0v, t a = +25?, unless otherwise noted.) wiper resistance vs. wiper voltage MAX5427 toc01 wiper voltage (v) wiper resistance ( ? ) 4 3 2 1 100 120 140 160 80 05 v dd = 3.3v v dd = 5.0v end-to-end resistance percent change vs. temperature MAX5427-29 toc02 temperature ( c) end-to-end resistance change (%) 60 35 10 -15 -0.2 -0.1 0 0.1 0.2 0.3 -0.3 -40 85 max5429 max5428 MAX5427 w-to-l resistance vs. tap position MAX5427-29 toc03 tap position w-to-l resistance (k ? ) 25 20 15 10 5 10 20 30 40 50 60 70 80 90 100 0 030 MAX5427 max5428 max5429 supply current vs. temperature MAX5427-29 toc04 temperature ( c) supply current ( a) 60 35 10 -15 0.05 0.10 0.15 0.20 0.25 0.30 0 -40 85 v dd = 5.0v v dd = 3.3v r-dnl error vs. input code (MAX5427) MAX5427-29 toc07 input code (decimal) r-dnl (lsb) 25 20 51015 -0.015 -0.010 -0.005 0 0.005 0.010 0.015 0.020 -0.020 030 r-inl error vs. input code (MAX5427) MAX5427-29 toc08 input code (decimal) r-inl (lsb) 25 20 15 10 5 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 030 r-dnl error vs. input code (max5428) MAX5427-29 toc09 input code (decimal) r-dnl (lsb) 25 20 51015 -0.015 -0.010 -0.005 0 0.005 0.010 0.015 0.020 -0.020 030 tap-to-tap switching transient MAX5427-29 toc05 100ns/div output w 100mv/div u/d 2v/div c l = 10pf wiper transient at power-on MAX5427-29 toc06 2 s/div output w 1v/div v dd 2v/div www.datasheet.co.kr datasheet pdf - http://www..net/
detailed description the MAX5427/max5428/max5429 are 100k ? /50k ? / 10k ? (end-to-end resistance) digitally controlled poten- tiometers. they have 32 tap positions that are accessible to the wiper along the resistor array between h and l. the wiper (w) position is adjusted sequentially through the tap positions using a simple 2-wire interface. these digital potentiometers have an optional one-time pro- grammable feature that sets the por position of the wiper. the 2-wire interface can then be disabled, perma- nently preventing unwanted adjustment. digital interface operation the MAX5427/max5428/max5429 have two modes of operation when the serial interface is active: increment mode and decrement mode. the serial interface is only active when cs is low. the cs and u/ d inputs control the position of the wiper along the resistor array. when cs transitions from high to low, the part goes into increment mode if u/ d is high (figure 2), and into decrement mode if u/ d is low (figure 3). once the mode is set, the device remains in that mode until cs goes high. a low-to-high transition at the u/ d increments or decrements the wiper position depending on the current mode. when the cs input transitions to high (when serial inter- face is inactive) and u/ d is low, the wiper increments or decrements one position in accordance with the state of u/ d when cs went low. if u/ d is high when cs tran- sitions to high, the wiper remains in the same position. MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 5 pin description typical operating characteristics (continued) (v dd = 5.0v, t a = +25?, unless otherwise noted.) r-inl error vs. input code (max5428) MAX5427-29 toc10 input code (decimal) r-inl (lsb) 25 20 15 10 5 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 030 r-dnl error vs. input code (max5429) MAX5427-29 toc11 input code (decimal) r-dnl (lsb) 25 20 15 10 5 -0.020 -0.015 -0.010 -0.005 0 0.005 0.010 0.015 0.020 0.025 -0.025 030 r-inl error vs. input code (max5429) MAX5427-29 toc12 input code (decimal) r-inl (lsb) 25 20 15 10 5 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.10 -0.10 030 pin name function 1 w wiper connection 2 cs chip-select input. a high-to-low cs transition determines the mode: increment if u/ d is high, or decrement if u/ d is low. cs is also used for one-time programming (see the one-time programming section). 3v dd power-supply voltage 4 gnd ground 5v pp programming voltage for one-time programming. connect v pp to 10v supply when one-time programming the device. for normal operation, connect to ground or let float. 6u/ d up/ down control input. with cs low, a low-to-high transition increments or decrements the wiper position. 7 l low terminal of resistor 8 h high terminal of resistor www.datasheet.co.kr datasheet pdf - http://www..net/
MAX5427/max5428/max5429 the value of the counter is then stored and the wiper position is maintained. the wiper performs a make-before-break transition, ensuring that there is never an open circuit during a tran- sition from one resistor tap to another. when the wiper is at either end (max/min) of the resistor array, additional transitions in the direction of the endpoint do not change the counter value (the counter does not wrap around). one-time programming the factory-set default position of the wiper on power- up is tap 16. however, the power-up position can be changed once using the one-time programming fea- ture. after the wiper is moved to the desired position, the programming sequence is initiated by setting u/ d high, applying 11v to v pp , and then taking cs low. five pulses on cs (consisting of cs starting from low and going high for t ch and then low for t cl ) program the device (figure 4). the programming voltage should then be taken to zero. after the device is programmed, v pp can be set to zero or be allowed to float. the wiper position is still adjustable, but always returns to this programmed position on power-up. if the intent is to program the device to a specific wiper position and not to allow further adjustments, then six programming pulses are required (as opposed to five), as shown in figure 4. the sixth pulse locks the wiper position and disables the serial interface. this also allows u/ d and cs to float without any increase in sup- ply current. once the lockout bit is set, no further adjustment to the potentiometer is possible, effectively changing the potentiometer into a fixed resistor-divider (table 1). one-time programmable, linear-taper digital potentiometers 6 _______________________________________________________________________________________ v dd u/d cs v w t up t cu t ci t il t iw t ih t ic figure 2. increment mode serial interface timing diagram v dd u/d cs v w t up t cu t ci t ih t iw t il t ic figure 3. decrement mode serial interface timing diagram mode power-on reset wiper position adjustable wiper factory default (unprogrammed) tap 16 yes programmed (5 programming pulses) programmed position yes lock-bit set (6 programming pulses) programmed position no table 1. one-time programming options www.datasheet.co.kr datasheet pdf - http://www..net/
it is recommended that the user either use six cs puls- es (convert to a fixed voltage-divider) or five pulses (program the initial power-up value of the device, but still be able to adjust the wiper). if the device is pro- grammed with five pulses and later it is desired to dis- able the interface (convert to a fixed voltage-divider), then care must be taken to ensure that the wiper is in the same position as it was originally set to (when pro- grammed with five pulses). the full six programming pulses must be applied. if the wiper is not in its original programmed position prior to disabling the interface, the final locked-out position is correct. note that once the six-pulse program occurs, no further programming is possible. the v pp power supply must be able to source at least 5ma and have a good transient response. the v pp power supply should be decoupled with 22? and have no more than 250? of inductance and/or 40 ? of parasitic resis- tance between the capacitors and the device (figure 5). the device does not require decoupling capacitors near v pp , provided the above guidelines are met. MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 7 v pp cs 11v 0v 5 bits record wiper position optional lockout bit u/d t ch t cl t cp t ph t pc figure 4. one-time program mode serial interface timing diagram l parasitic r parasitic trace parasitics MAX5427 max5428 max5429 v pp = 11v 22 f < 250 h < 40 ? v pp figure 5. v pp power-supply connection chip information transistor count: 2270 process: bicmos www.datasheet.co.kr datasheet pdf - http://www..net/
MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers 8 _______________________________________________________________________________________ 6, 8, &10l, dfn thin.eps l c l c pin 1 index area d e l e l a e e2 n g 1 2 21-0137 package outline, 6,8,10 & 14l, tdfn, exposed pad, 3x3x0.80 mm -drawing not to scale- k e [(n/2)-1] x e ref. pin 1 id 0.35x0.35 detail a b d2 a2 a1 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 .) www.datasheet.co.kr datasheet pdf - http://www..net/
MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers _______________________________________________________________________________________ 9 common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 1.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref -drawing not to scale- g 2 2 21-0137 package outline, 6,8,10 & 14l, tdfn, exposed pad, 3x3x0.80 mm downbonds allowed no no no no yes no yes no package information (continued) (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 .) www.datasheet.co.kr datasheet pdf - http://www..net/
MAX5427/max5428/max5429 one-time programmable, linear-taper digital potentiometers 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. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 8lumaxd.ep s package outline, 8l umax/usop 1 1 21-0036 j rev. document control no. approval proprietary information title: max 0.043 0.006 0.014 0.120 0.120 0.198 0.026 0.007 0.037 0.0207 bsc 0.0256 bsc a2 a1 c e b a l front view side view e h 0.60.1 0.60.1 ? 0.500.1 1 top view d 8 a2 0.030 bottom view 1 6 s b l h e d e c 0 0.010 0.116 0.116 0.188 0.016 0.005 8 4x s inches - a1 a min 0.002 0.95 0.75 0.5250 bsc 0.25 0.36 2.95 3.05 2.95 3.05 4.78 0.41 0.65 bsc 5.03 0.66 6 0 0.13 0.18 max min millimeters - 1.10 0.05 0.15 dim package information (continued) (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 .) www.datasheet.co.kr datasheet pdf - http://www..net/
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