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? semiconductor components industries, llc, 2010 november, 2010 ? rev. 6 1 publication order number: cat5120/d cat5120, cat5121, cat5122 16-tap minipot digitally programmable potentiometers with 2-wire interface description cat5120/5121/5122 linear ? taper digitally programmable potentiometers perform the same function as a mechanical potentiometer or a variable resistor. these devices consist of a fixed resistor and a wiper contact with 16 ? tap points that are digitally controlled through a 2 ? wire up/down serial interface. the cat5120 is configured as a potentiometer. the cat5121 and cat5122 are configured as variable resistors. see pin configurations for part functionality. three resistance values are available: 10 k , 50 k and 100 k . these are available in space ? saving 5 ? pin and 6 ? pin sc ? 70 and sot ? 23 packages. features ? 0.3 a ultra ? low standby current ? single ? supply operation: 2.7 v to 5.5 v ? glitchless switching between resistor taps ? power ? on reset to midscale ? 2 ? wire up/down serial interface ? resistance values: 10 k , 50 k and 100 k ? available in sc ? 70 and sot ? 23 packages ? these devices are pb ? free, halogen free/bfr free and are rohs compliant applications ? lcd screen adjustment ? volume control ? mechanical potentiometer replacement ? gain adjustment ? line impedance matching http://onsemi.com sc ? 70 sd suffix case 419ad pin configurations sot ? 23 tb suffix case 527aj sc ? 70 sd suffix case 419ac sot ? 23 tb suffix case 527ah gnd h 2 cat5122 16 1 5 34 2 3 4 w 5 cat5120 sc ? 70 sot ? 23 1 6 2 l 5 cat5121 3 4 see detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet. ordering information cs u/d v dd gnd h sc ? 70 sot ? 23 cs u/d v dd gnd h sc ? 70 sot ? 23 cs u/d v dd
cat5120, cat5121, cat5122 http://onsemi.com 2 figure 1. functional diagram 16 ? position decoder up ? down counter gnd h l w u/d cs v dd table 1. pin descriptions name description v dd power supply gnd ground u/d up/down control input. with cs low, a low ? to ? high transition increments or decrements the wiper position. 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. l low terminal of resistor w wiper terminal of resistor h high terminal of resistor table 2. absolute maximum ratings parameters ratings units v dd to gnd ? 0.3 to +6 v all other pins to gnd ? 0.3 to (v dd + 0.3) v input and output latch ? up immunity 200 ma maximum continuous current into h, l and w 100 k 50 k 10 k 0.6 1.3 1.3 ma continuous power dissipation (t a = +70 c) 5 ? pin sc ? 70 (note 1) 6 ? pin sc ? 70 (note 1) 247 245 mw operating temperature range ? 40 to +85 c junction temperature +150 c storage temperature range ? 65 to +150 c soldering temperature (soldering, 10 s) +300 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. 1. derate 3.1 mw/ c above t a = +70 c
cat5120, cat5121, cat5122 http://onsemi.com 3 table 3. electrical characteristics (v dd = 2.7 v to 5.5 v, v h = v dd , v l = 0, t a = ? 40 c to +85 c. typical values are at v dd = 2.7 v, t a = 25 c, unless otherwise noted.) parameter symbol conditions min typ max units dc performance resolution 16 taps end ? to ? end resistance ( ? 00) 75 100 125 k end ? to ? end resistance ( ? 50) 37.5 50 62.5 end ? to ? end resistance ( ? 10) 7.5 10 12.5 end ? to ? end resistance tempco tc r 200 ppm/ c ratiometric resistance tempco 5 ppm/ c integral nonlinearity inl 0.5 lsb differential nonlinearity dnl 0.5 lsb zero/full ? scale error 0.1 0.5 lsb wiper resistance r w 200 600 digital inputs input high voltage v ih 0.7 x v dd v input low voltage v il 0.3 x v dd v timing characteristics (figures 7, 8) u/d mode to cs setup t cu 25 ns cs to u/d step setup t ci 50 ns cs to u/d step hold t ic 25 ns u/d step low period t il 25 ns u/d step high period t ih 25 ns up/down toggle rate (note 2) f toggle 1 mhz output settling time (note 3) t settle 100 k variable resistor configuration, c l = 10 pf 1 s 100 k potentiometer configuration, c l = 10 pf 0.25 power supply supply voltage v dd 2.7 5.5 v active supply current (note 4) i dd 25 a standby supply current (note 5) i sb v dd = +5 v 0.3 1 a 2. up/down toggle rate: f toggle = 1 / t settle 3. typical settling times are dependent on end ? to ? end resistance. 4. supply current measured while changing wiper tap, f toggle = 1 mhz. 5. supply current measured while wiper position is fixed.
cat5120, cat5121, cat5122 http://onsemi.com 4 typical operating characteristics (t a = 25 c, unless otherwise noted.) figure 2. wiper resistance vs. tap position figure 3. change in end ? to ? end resistance vs. temperature wiper position temperature ( c) 28 32 20 16 12 8 4 0 0 50 100 150 200 250 150 100 50 0 ? 50 ? 2.0 ? 1.5 ? 1.0 ? 0.5 0 0.5 1.0 1.5 figure 4. w ? to ? l resistance vs. tap position figure 5. supply current vs. temperature tap position temperature ( c) 31 7 5 3 1 0 20 60 80 100 120 figure 6. tap ? to ? tap switching transient wiper resistance ( ) end ? to ? end resistance change (%) resistance (k ) 24 v dd = 2.7 v v dd = 5.5 v 50 k 40 150 100 50 0 ? 50 0 0.05 0.10 0.20 0.25 0.30 0.40 0.45 current ( a) 0.15 0.35 v dd = 2.7 v v dd = 5.5 v 13 11 919 17 15 25 23 21 29 27 100 k 50 k 10 k 200 ns/div u/d 2 v/div wiper output 100 mv/div
cat5120, cat5121, cat5122 http://onsemi.com 5 functional description the cat5120/5121/5122 consist of a fixed resistor and a wiper contact with 16 ? tap points that are digitally controlled through a 2 ? wire up/down serial interface. three end ? to ? end resistance values are available: 10 k , 50 k and 100 k . the cat5120 is designed to operate as a potentiometer. in this configuration, the low terminal of the resistor array is connected to ground (pin 2). the cat5122 performs as a variable resistor. in this device, the wiper terminal and high terminal of the resistor array is connected at pin 5. the cat5121 is a similar variable resistor, except the low terminal is connected to pin 5. digital interface operation the minipots have two modes of operation when the serial interface is active: increment 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 will go into increment mode if u/d input is high, and into decrement mode when u/d input is low. once the mode is set, the device will remain in that mode until cs goes high again. a low ? to ? high transition at the u/d pin will increment or decrement the wiper position depending on the current mode (figures 7 and 8). when the cs input transitions to high (serial interface inactive), the value of the counter is stored and the wiper position is maintained. note that when the wiper reaches the maximum (or minimum) tap position, the wiper will not wrap around to the minimum (or maximum) position. power ? on reset all parts in this family feature power ? on reset (por) circuitry that sets the wiper position to midscale at power ? up. by default, the chip is in the increment mode. figure 7. serial interface timing diagram, increment mode w t cu u/d cs t ci t il t ih t settle t settle t ic note: ?w? is not a digital signal. it represents wiper transitions. figure 8. serial interface timing diagram, decrement mode w note: ?w? is not a digital signal. it represents wiper transitions. u/d cs t cu t ci t settle t ih t il t ic t settle
cat5120, cat5121, cat5122 http://onsemi.com 6 applications information the minipots are intended for circuits requiring digitally controlled adjustable resistance, such as lcd contrast control, where voltage biasing adjusts the display contrast. alternative positive lcd bias control use an op amp to provide buffering and gain on the output of the cat5120. connect the mechanical potentiometer to the positive input of a noninverting op amp (figure 9) to select a portion of the input signal by digitally controlling the wiper terminal. figure 10 shows a similar circuit for the cat5121. adjustable gain figures 11 and 12 show how to use the variable resistor to digitally adjust the gain of a noninverting op amp configuration. connect the cat5121 in series with a resistor to ground to form the adjustable gain control of a noninverting amplifier. the minipots have a low 5 ppm/ c ratiometric tempco that allows for a very stable adjustable gain configuration over temperature. 30 v w l h +5 v 30 v l h +5 v l h l h w cat5120 cat5121 cat5121 cat5120 figure 9. positive lcd bias control figure 10. positive lcd bias control figure 11. adjustable gain circuit figure 12. adjustable gain circuit v out v out v in v cc v out v in v out v cc
cat5120, cat5121, cat5122 http://onsemi.com 7 package dimensions sc ? 70, 6 lead, 1.25x2 case 419ad ? 01 issue o e1 d a l l1 l2 ee b a1 a2 c top view side view end view 1 1 notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-203. e symbol min nom max a a1 b c d e e1 e l 0o 8o l2 0.00 0.15 0.10 0.26 1.80 1.80 1.15 0.65 bsc 0.15 bsc 1.10 0.10 0.30 0.18 0.46 2.20 2.40 1.35 l1 0.80 1 4o 10o a2 0.80 1.00 0.42 ref 0.36 2.00 2.10 1.25
cat5120, cat5121, cat5122 http://onsemi.com 8 package dimensions sot ? 23, 6 lead case 527aj ? 01 issue o top view side view end view e1 e pin #1 identification a2 a1 e b d c a l1 l l2 notes: (1) all dimensions in millimeters. angles in degrees. (2) complies with jedec standard mo-178. 2 1 symbol min nom max 2 5 15 a a1 a2 b c d e e1 l l2 0.00 0.90 0.30 0.08 2.90 bsc 1.60 bsc 0.45 1.45 0.15 1.30 0.50 0.22 0.25 ref 1.15 2.80 bsc l1 0.60 ref e 0.30 0.60 0.95 bsc 0.90 10 1 5 15 10 0 8 4
cat5120, cat5121, cat5122 http://onsemi.com 9 package dimensions sc ? 70, 5 lead, 1.25x2 case 419ac ? 01 issue o e1 d a l l1 l2 ee b a1 a2 c top view side view end view 1 1 notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-203. e symbol min nom max a a1 b c d e e1 e l 0o 8o l2 0.00 0.15 0.10 0.26 1.80 1.80 1.15 0.65 bsc 0.15 bsc 1.10 0.10 0.30 0.18 0.46 2.20 2.40 1.35 l1 0.80 1 4o 10o a2 0.80 1.00 0.42 ref 0.36 2.00 2.10 1.25
cat5120, cat5121, cat5122 http://onsemi.com 10 package dimensions sot ? 23, 5 lead case 527ah ? 01 issue o top view side view end view e1 e pin #1 identification a2 a1 e b d c a l1 l l2 notes: (1) all dimensions in millimeters. angles in degrees. (2) complies with jedec standard mo-178. 2 1 symbol min nom max 2 5 15 a a1 a2 b c d e e1 l l2 0.00 0.90 0.30 0.08 2.90 bsc 1.60 bsc 0.45 1.45 0.15 1.30 0.50 0.22 0.25 ref 1.15 2.80 bsc l1 0.60 ref e 0.30 0.60 0.95 bsc 0.90 10 1 5 15 10 0 8 4
cat5120, cat5121, cat5122 http://onsemi.com 11 table 4. ordering information orderable part number resistor [k ] pin package quantity per reel cat5120sdi ? 10gt3 10 sc70 ? 6 3,000 cat5120tbi ? 10 ? t3 (note 6) 10 sot23 ? 6 3,000 cat5120tbi ? 10gt3 10 sot23 ? 6 3,000 cat5120sdi ? 50gt3 50 sc70 ? 6 3,000 cat5120tbi ? 50 ? t3 (note 6) 50 sot23 ? 6 3,000 cat5120tbi ? 50gt3 50 sot23 ? 6 3,000 cat5120sdi ? 00gt3 100 sc70 ? 6 3,000 cat5120tbi ? 00 ? t3 (note 6) 100 sot23 ? 6 3,000 cat5120tbi ? 00gt3 100 sot23 ? 6 3,000 cat5121sdi ? 10gt3 10 sc70 ? 6 3,000 cat5121tbi ? 10 ? t3 (note 6) 10 sot23 ? 6 3,000 cat5121tbi ? 10gt3 10 sot23 ? 6 3,000 cat5121sdi ? 50gt3 50 sc70 ? 6 3,000 cat5121tbi ? 50 ? t3 (note 6) 50 sot23 ? 6 3,000 cat5121tbi ? 50gt3 50 sot23 ? 6 3,000 cat5121sdi ? 00gt3 100 sc70 ? 6 3,000 cat5121tbi ? 00 ? t3 (note 6) 100 sot23 ? 6 3,000 cat5121tbi ? 00gt3 100 sot23 ? 6 3,000 cat5122sdi ? 10gt3 10 sc70 ? 5 3,000 cat5122tbi ? 10 ? t3 (note 6) 10 sot23 ? 5 3,000 cat5122tbi ? 10gt3 10 sot23 ? 5 3,000 cat5122sdi ? 50gt3 50 sc70 ? 5 3,000 cat5122tbi ? 50 ? t3 (note 6) 50 sot23 ? 5 3,000 cat5122tbi ? 50gt3 50 sot23 ? 5 3,000 cat5122sdi ? 00gt3 100 sc70 ? 5 3,000 cat5122tbi ? 00 ? t3 (note 6) 100 sot23 ? 5 3,000 cat5122tbi ? 00gt3 100 sot23 ? 5 3,000 6. part number is not exactly the same as the ?example of ordering information? shown on page 12. for part numbers marked with (1) there are two hyphens in the orderable part number.
cat5120, cat5121, cat5122 http://onsemi.com 12 example of ordering information (note 9) prefix device # suffix company id cat 5120 product number 5120 t3 t: tape & reel 3: 3,000 / reel tape & reel (note 11) (optional) sd package g g: nipdau blank: matte ? tin lead finish 5121 5122 sd: sc ? 70 tb: sot ? 23 ? 10: 10 k ? 50: 50 k ? 00: 100 k resistance ? 10 i i = industrial ( ? 40 c to +85 c) temperature range 7. all packages are rohs ? compliant (lead ? free, halogen ? free). 8. the standard finish is nipdau. 9. the device used in the above example is a ca t5120sdi ? 10gt3 (sc ? 70, industrial temperature, 10 k , nipdau, tape & reel, 3,000/reel). 10. for additional package and temperature options, please contact your nearest on semiconductor sales office. 11. for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and ree l packaging specifications brochure, brd8011/d. on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. cat5120/d minipot is a trademark of semiconductor components industries, llc. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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