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cat5120, cat5121, cat5122 ? 2008 scillc. all rights reserved. 1 doc. no. md-2121 rev. f characteristics subject to change without notice 16-tap minipot? digitally programmable potentiometers with 2-wire interface features ? 0.3a ultra-low standby current ? single-supply operation: 2.7v to 5.5v ? glitchless switching between resistor taps ? power-on reset to midscale ? 2-wire up/down serial interface ? resistance values: 10k ? , 50k ? and 100k ? ? available in sc-70 and sot-23 packages applications ? lcd screen adjustment ? volume control ? mechanical potentiometer replacement ? gain adjustment ? line impedance matching for ordering information details, see page 10. pin configuration 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: 10k ? , 50k ? and 100k ? . these are available in space-saving 5-pin and 6-pin sc-70 and sot-23 packages. functional diagram 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 16-position decoder up-down counter u/d v dd gnd h l w cs gnd cs u/d h 2 cat5122 gnd cs u/d 16 15 34 h v dd v dd v dd 2 34 w 5 cat5120 sc-70 sot-23 sc-70 sot-23 sc-70 sot-23 gnd cs u/d 16h 2 l 5 cat5121 34
cat5120, cat5121, cat5122 doc. no. md-2121 rev. f 2 ? 2008 scillc. all rights reserved. characteristics subject to change without notice absolute maximum ratings (1) 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-u p immunity 200 ma maximum continuous current into h, l and w 100k ? 50k ? 10k ? 0.6 1.3 1.3 ma continuous power dissipation (t a = +70oc) 5-pin sc-70 (2) 6-pin sc-70 (2) 247 245 mw operating temperature range -40 to +85 oc junction temperature +150 oc storage temperature range -65 to +150 oc soldering temperature (soldering, 10s) +300 oc electrical characteristics v dd = 2.7v to 5.5v, v h = v dd , v l = 0, t a = -40oc to +85oc. typical values are at v dd = 2.7v, t a = 25oc, unless otherwise noted. parameter symbol conditions min typ max units dc performance resolution 16 taps end-to-end resistance (-00) 75 100 125 end-to-end resistance (-50) 37.5 50 62.5 end-to-end resistance (-10) 7.5 10 12.5 k ? end-to-end resistance tempco tc r 200 ppm/oc ratiometric resistance tempco 5 ppm/oc 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 notes: (1) stresses above those listed under ?absolut e maximum ratings? may cause permanent dam age to the device. these are stress rat ings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sectio ns of this specification is not implied. exposure to any absolute maximum rating for extended pe riods may affect device performance and re liability. (2) derate 3.1mw/oc above t a = +70oc
cat5120, cat5121, cat5122 ? 2008 scillc. all rights reserved. 3 doc. no. md-2121 rev. f characteristics subject to change without notice electrical characteristics (continued) parameter symbol conditions min typ max units timing characteristics (figures 1, 2) 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 (1) f toggle 1 mhz 100k ? variable resistor configuration, c l = 10pf 1 output settling time (2) t settle 100k ? potentiometer configuration, c l = 10pf 0.25 s power supply supply voltage v dd 2.7 5.5 v active supply current (3) i dd 25 a standby supply current (4) i sb v dd = +5v 0.3 1 a typical operating characteristics t a = 25oc, unless otherwise noted. notes: (1) up/down toggle rate: settle toggle t 1 = f (2) typical settling times are dependent on end-to-end resistance. (3) supply current measured while changing wiper tap, f toggle = 1mhz. (4) supply current measured while wiper position is fixed. v dd = 5.5v v dd = 2.7v 08 4 12162024 wiper position temperature (oc) temperature (oc) v dd = 2.7v 28 32 50k v dd = 5.5v
cat5120, cat5121, cat5122 doc. no. md-2121 rev. f 4 ? 2008 scillc. all rights reserved. characteristics subject to change without notice functional description the cat5120/5121/5122 consist of a fixed resistor and a wiper contact with 16-tap points that are digitally controlled through a2-wire up/down serial interface. three end-to-end resistance values are available: 10k ? , 50k ? and 100k ? . 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 1 and 2). 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 1. serial interface timing diagram, increment mode figure 2. serial interface timing diagram, decrement mode cs u/d w t cu t il t ih t settle t ic t ci t settle note: "w" is not a digital signal. it represents wiper transitions. cs u/d w t cu t il t ih t ic t settle t ci t settle note: "w" is not a digital signal. it represents wiper transitions.
cat5120, cat5121, cat5122 ? 2008 scillc. all rights reserved. 5 doc. no. md-2121 rev. f characteristics subject to change without notice 30v w l h +5v v out 30v l h +5v v ou t v cc l h v in v out v cc l h w v in v out cat5120 cat5121 cat5121 cat5120 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 3) to select a portion of the input signal by digitally controlling th e wiper terminal. figure 4 shows a similar circuit for the cat5121. adjustable gain figure 5 shows 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 5ppm/c ratiometric tempco that allows for a very stable adjustable gain configuration over temperature. figure 3. positive lcd bias control figure 5a. adjustable gain circuit figure 5b. adjustable gain circuit figure 4. positive lcd bias control
cat5120, cat5121, cat5122 doc. no. md-2121 rev. f 6 ? 2008 scillc. all rights reserved. characteristics subject to change without notice package outline drawings sc-70 6-lead (sd) (1)(2) notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec standard ms-203. for current tape and reel information, download the pdf file from: http://www.catsemi.com/documents/tapeandreel.pdf. e1 e d a l l1 l2 ee b a1 a2 c top view side view end view 1 1 symbol min nom max a 0.80 1.10 a1 0.00 0.10 a2 0.80 1.00 b 0.15 0.30 c 0.10 0.18 d 1.80 2.00 2.20 e 1.80 2.10 2.40 e1 1.15 1.25 1.35 e 0.65 bsc l 0.26 0.36 0.46 l1 0.42 ref l2 0.15 bsc 0 8 1 4 10
cat5120, cat5121, cat5122 ? 2008 scillc. all rights reserved. 7 doc. no. md-2121 rev. f characteristics subject to change without notice sot-23 6-lead (tb) (1)(2) notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec standard mo-178. for current tape and reel information, download the pdf file from: http://www.catsemi.com/documents/tapeandreel.pdf. top view side view end view e1 e pin #1 identification a2 a1 e b d c a l1 l l2 symbol min nom max a 0.90 1.45 a1 0.00 0.15 a2 0.90 1.15 1.30 b 0.30 0.50 c 0.08 0.22 d2.90 bsc e2.80 bsc e1 1.60 bsc e0.95 bsc l 0.30 0.45 0.60 l1 0.60 ref l2 0.25 ref 0o 4o 8o 1 5o 10o 15o 2 5o 10o 15o 2 1
cat5120, cat5121, cat5122 doc. no. md-2121 rev. f 8 ? 2008 scillc. all rights reserved. characteristics subject to change without notice sc-70 5-lead (sd) (1)(2) notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec standard ms-203. for current tape and reel information, download the pdf file from: http://www.catsemi.com/documents/tapeandreel.pdf. e1 e d a l l1 l2 ee b a1 a2 c top view side view end view 1 1 symbol min nom max a 0.80 1.10 a1 0.00 0.10 a2 0.80 1.00 b 0.15 0.30 c 0.10 0.18 d 1.80 2.00 2.20 e 1.80 2.10 2.40 e1 1.15 1.25 1.35 e 0.65 bsc l 0.26 0.36 0.46 l1 0.42 ref l2 0.15 bsc 0 8 14 10
cat5120, cat5121, cat5122 ? 2008 scillc. all rights reserved. 9 doc. no. md-2121 rev. f characteristics subject to change without notice sot-23 5-lead (tb) (1)(2) notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec standard mo-178. for current tape and reel information, download the pdf file from: http://www.catsemi.com/documents/tapeandreel.pdf. top view side view end view e1 e pin #1 identification a2 a1 e b d c a l1 l l2 2 1 symbol min nom max a 0.90 1.45 a1 0.00 0.15 a2 0.90 1.15 1.30 b 0.30 0.50 c 0.08 0.22 d 2.90 bsc e 2.80 bsc e1 1.60 bsc e 0.95 bsc l 0.30 0.45 0.60 l1 0.60 ref l2 0.25 ref 0o 4o 8o 15o10o15o 25o10o15o
cat5120, cat5121, cat5122 doc. no. md-2121 rev. f 10 ? 2008 scillc. all rights reserved. characteristics subject to change without notice example of ordering information (1) notes: (1) all packages are rohs-compliant (lead-free, halogen-free). (2) the standard finish is nipdau. (3) the device used in the example above is a cat5120sdi-10-gt3 (sc-70, industrial temperature, 10k ? , nipdau, tape & reel, 3,000/reel). (4) for additional package and temperatur e options, please contact your neares t on semiconductor sales office. prefix device # suffix cat 5120 sd i -10 ? g t3 optional company id temperature range i = industrial (-40oc to 85oc) resistance -10: 10k ? -50: 50k ? -00: 100k ? tape & reel t: tape & reel 3: 3,000/reel product number 5120 5121 5122 package sd: sc-70 tb: sot-23 lead finish blank: matte-tin g: nipdau for product top mark codes, click here: http://www.catsemi.com/techsupport/producttopmark.asp
cat5120, cat5121, cat5122 ? 2008 scillc. all rights reserved. 11 doc. no. md-2121 rev. f characteristics subject to change without notice ordering information part number resistor [k ? ] pin package quantity per reel cat5120sdi-10-gt3 10 sc70-6 3,000 cat5120tbi-10-t3 10 sot23-6 3,000 cat5120tbi-10-gt3 10 sot23-6 3,000 cat5120sdi-50-gt3 50 sc70-6 3,000 cat5120tbi-50-t3 50 sot23-6 3,000 cat5120tbi-50-gt3 50 sot23-6 3,000 cat5120sdi-00-gt3 100 sc70-6 3,000 cat5120tbi-00-t3 100 sot23-6 3,000 cat5120tbi-00-gt3 100 sot23-6 3,000 cat5121sdi-10-gt3 10 sc70-6 3,000 cat5121tbi-10-t3 10 sot23-6 3,000 cat5121tbi-10-gt3 10 sot23-6 3,000 CAT5121SDI-50-GT3 50 sc70-6 3,000 cat5121tbi-50-t3 50 sot23-6 3,000 cat5121tbi-50-gt3 50 sot23-6 3,000 cat5121sdi-00-gt3 100 sc70-6 3,000 cat5121tbi-00-t3 100 sot23-6 3,000 cat5121tbi-00-gt3 100 sot23-6 3,000 cat5122sdi-10-gt3 10 sc70-5 3,000 cat5122tbi-10-t3 10 sot23-5 3,000 cat5122tbi-10-gt3 10 sot23-5 3,000 cat5122sdi-50-gt3 50 sc70-5 3,000 cat5122tbi-50-t3 50 sot23-5 3,000 cat5122tbi-50-gt3 50 sot23-5 3,000 cat5122sdi-00-gt3 100 sc70-5 3,000 cat5122tbi-00-t3 100 sot23-5 3,000 cat5122tbi-00-gt3 100 sot23-5 3,000
cat5120, cat5121, cat5122 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes with out further notice to any products herein. scillc make s no warranty, representa tion or guarantee regarding the suitability of its products for any pa rticular 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. sci llc 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 officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly o r 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 manufact ure 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. publication ordering information literature fulfillment: literature distribution ce nter 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 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 on semiconductor website: www.onsemi.com order literature: http://www.onsemi.com/orderlit for additional information, please contact your local sales representative doc. no. md-2121 rev. f 12 ? 2008 scillc. all rights reserved. characteristics subject to change without notice revision history date rev. description 10-mar-05 a initial issue 27-sep-06 b update electrical characteristics 12-mar-07 c update ordering information update package outlines add example of ordering information add sot-23 5 lead package drawing update sot-23 6 lead package drawing 12-mar-08 d update package outline drawings update ordering information add md- to document number add top mark code link 29-may-08 e delete 10,000 per reel option u p date document la y out 21-nov-08 f change logo and fine print to on semiconductor cat5120, cat5121, cat5122

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