rev 1.1 11/10/00 characteristics subject to change without notice. 1 of 9 www.xicor.com block diagram 5-bit up/down counter 5-bit nonvolatile memory store and recall control circuitry one of thirty-two decoder resistor array 31 30 29 28 2 1 0 v l /r l v w /r w v h /r h u/d inc cs v cc v ss transfer gates X9314 single digitally controlled potentiometer (xdcp ) features solid state potentiometer 32 taps 10k ? end to end resistance three-wire up/down serial interface wiper resistance, 40 ? typical nonvolatile storage and recall on power up of wiper position standby current < 500? max (total package) ? cc = 3v to 5.5v operation 100 year data retention offered in msop, soic packages description the xicor X9314 is a solid state nonvolatile potentiometer and is ideal for digitally controlled resistance trimming. the X9314 is a resistor array composed of 31 resistive elements. between each element and at either end are tap points accessible to the wiper element. the position of the wiper element is controlled by the cs , u/d , and inc inputs. the position of the wiper can be stored in nonvolatile memory and then be recalled upon a subsequent power-up operation. the xdcp can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing. terminal voltages ?v, 32 taps, log taper a pplication n ote a v a i l a b l e an42 ?an44?0 ?an52 ?an53 ?an71 ?an73 ?an99 ?an115 ?an120 ?an124 ?an134 xdcp is a trademark of xicor, inc.
X9314 rev 1.1 11/10/00 characteristics subject to change without notice. 2 of 9 www.xicor.com pin descriptions v h /r h and v l /r l the high (v h /r h ) and low (v l /r l ) terminals of the X9314 are equivalent to the ?ed terminals of a mechanical potentiometer. the minimum voltage is 5v and the maximum is +5v. it should be noted that the terminology of v l /r l and v h /r h references the relative position of the terminal in relation to wiper movement direction selected by the u/d input and not the voltage potential on the terminal. v w /r w v w /r w is the wiper terminal, equivalent to the movable terminal of a mechanical potentiometer. the position of the wiper within the array is determined by the control inputs. the wiper terminal series resistance is typically 40 ? . up/down (u/d ) the u/d input controls the direction of the wiper movement and whether the counter is incremented or decremented. increment (inc ) the inc input is negative-edge triggered. toggling inc will move the wiper and either increment or decrement the counter in the direction indicated by the logic level on the u/d input. chip select (cs ) the device is selected when the cs input is low. the current counter value is stored in nonvolatile memory when cs is returned high while the inc input is also high. after the store operation is complete the X9314 will be placed in the low power standby mode until the device is selected once again. pin configuration pin names symbol description v h /r h high terminal v w /r w wiper terminal v l /r l low terminal v ss ground v cc supply voltage u/d up/down input inc increment input cs chip select input u/d inc v cc cs v h /r h v ss v w /r w v l /r l 1 2 3 4 8 7 6 5 X9314 8-lead msop v cc cs v l /r l v w /r w inc u/d v h /r h v ss 1 2 3 4 8 7 6 5 X9314 8-lead dip/soic typical attenuation characteristics (db) tap position 0 4 8 12 16 20 24 28 31 -20 -40 -43.5 0 -60 attenuation (db)
X9314 rev 1.1 11/10/00 characteristics subject to change without notice. 3 of 9 www.xicor.com principles of operation there are three sections of the X9314: the input control, counter and decode section; the nonvolatile memory; and the resistor array. the input control section operates just like an up/down counter. the output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. under the proper conditions the contents of the counter can be stored in nonvolatile memory and retained for future use. the resistor array is comprised of 31 individual resistors connected in series. at either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper. the inc , u/d and cs inputs control the movement of the wiper along the resistor array. with cs set low the X9314 is selected and enabled to respond to the u/d and inc inputs. high to low transitions on inc will increment or decrement (depending on the state of the u/d input) a ?e bit counter. the output of this counter is decoded to select one of thirty-two wiper positions along the resistive array. the wiper, when at either ?ed terminal, acts like its mechanical equivalent and does not move beyond the last position. that is, the counter does not wrap around when clocked to either extreme. the value of the counter is stored in nonvolatile memory whenever cs transistions high while the inc input is also high. when the X9314 is powered-down, the last counter position stored will be maintained in the nonvolatile memory. when power is restored, the contents of the memory are recalled and the counter is reset to the value last stored. operation notes the system may select the X9314, move the wiper and deselect the device without having to store the latest wiper position in nonvolatile memory. the wiper movement is performed as described above; once the new position is reached, the system would keep the inc low while taking cs high. the new wiper position would be maintained until changed by the system or until a power-up/down cycle recalled the previously stored data. this would allow the system to always power-up to a preset value stored in nonvolatile memory; then during system operation minor adjustments could be made. the adjustments might be based on user preference, system parameter changes due to temperature drift, etc... the state of u/d may be changed while cs remains low. this allows the host system to enable the X9314 and then move the wiper up and down until the proper trim is attained. t iw /r total the electronic switches on the X9314 operate in a ?ake before break mode when the wiper changes tap positions. if the wiper is moved several positions multiple taps are connected to the wiper for t iw (inc to v w change). the r total value for the device can temporarily be reduced by a signi?ant amount if the wiper is moved several positions. symbol table waveform inputs outputs must be steady will be steady may change from low to high will change from low to high may change from high to low will change from high to low don? care: changes allowed changing: state not known n/a center line is high impedance
X9314 rev 1.1 11/10/00 characteristics subject to change without notice. 4 of 9 www.xicor.com absolute maximum ratings temperature under bias ....................?5 c to +135 c storage temperature .........................?5? to +150? voltage on cs , inc , u/d , and v cc with respect to v ss ......................... ?v to +7v voltage on v h /r h and v l /r l referenced to v ss .......................................................-8v to +8v ? v = |v h /r h ? l /r l |.............................................. 10v lead temperature (soldering 10 seconds)..........300? wiper current ..................................................... ?ma i w (10 seconds) .............................................. ?.8ma comment stresses above those listed under ?bsolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this speci?ation) is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. potentiometer characteristics (over recommended operating conditions unless otherwise stated.) notes: (1) this parameter is periodically sampled and not 100% tested. power up and down requirement the are no restrictions on the sequencing of v cc and the voltages applied to the potentiometer pins during power- up or power-down conditions. during power-up, the data sheet parameters for the dcp do not fully apply until 1 millisecond after v cc reaches its ?al value. the v cc ramp rate spec is always in effect. symbol parameter limits test conditions/ notes min. typ. max. units r total end to end resistance tolerance ?0 % v h /r h terminal voltage -5 +5 v v vl/rl v l /r l terminal voltage -5 +5 v power rating 10 mw at 25? r w wiper resistance 40 100 ? i w = ?ma, v cc = 5v i w wiper current ?.4 ma noise -120 dbv ref: 1khz relative variation. error in step size between taps. 0.07- 0.003 0.07 + 0.003 log (r w(n) )?og r w(n-1) ) r total temperature coefficient ?00 ppm/? for -40? to +85? ratiometric temperature coefficient ?0 ppm/? c h /c l /c w potentiometer capacitance 10/10/25 pf see circuit #3 recommended operating conditions temperature min. max. commercial 0? +70? industrial ?0? +85? supply voltage (v cc ) limits X9314 5v ?0% X9314-3 3v to 5.5v
X9314 rev 1.1 11/10/00 characteristics subject to change without notice. 5 of 9 www.xicor.com d.c. operating characteristics (over recommended operating conditions unless otherwise speci?d.) standard parts notes: (4) typical values are for t a = 25? and nominal supply voltage. (5) this parameter is periodically sampled and not 100% tested. symbol parameter limits units test conditions min. typ. (4) max. i cc v cc active current 1 3 ma cs = v il , u/d = v il or v ih and inc = 0.4v/2.4v @ max. t cyc i sb standby supply current 500 ? cs = v cc ?0.3v, u/d and inc = v ss or v cc ?0.3v i li cs , inc , u/d input leakage current ?0 ? v in = v ss to v cc v ih cs , inc , u/d input high voltage 2 v cc + 1 v v il cs , inc , u/d input low voltage ? 0.8 v c in (5) cs , inc , u/d input capacitance 10 pf v cc = 5v, v in = v ss , t a = 25?, f = 1mhz part number maximum resistance wiper increments minimum resistance X9314w 10k ? log taper 40 ? test circuit #1 test circuit #2 circuit #3 spice macromodel test point v w /r w v h /r h v l /r l force current v w /r w v h /r h v l /r l test point 10pf r h r total c h 25pf c w c l 10pf r w r l macro model a.c. conditions of test mode selection input pulse levels 0v to 3v input rise and fall times 10ns input reference levels 1.5v cs inc u/d mode l h wiper up l l wiper down h x store wiper position h x x standby l x no store, return to standby
X9314 rev 1.1 11/10/00 characteristics subject to change without notice. 6 of 9 www.xicor.com a.c. operating characteristics (over recommended operating conditions unless otherwise speci?d) a.c. timing notes: (6) typical values are for t a = 25? and nominal supply voltage. (7) this parameter is periodically sampled and not 100% tested. (8) mi in the a.c. timing diagram refers to the minimum incremental change in the v w output due to a change in the wiper position. symbol parameter limits units min. typ. (6) max. t cl cs to inc setup 100 ns t ld inc high to u/d change 100 ns t di u/d to inc setup 2.9 ? t ll inc low period 1 s t lh inc high period 1 s t lc inc inactive to cs inactive 1 s t cph cs deselect time 20 ms t iw inc to v w change 100 500 ? t cyc inc cycle time 4 s t r , t f (7) inc input rise and fall time 500 ? t pu (7) power up to wiper stable 500 ? t r v cc v cc power-up rate 0.2 50 mv/? cs inc u/d v w t ci t ih t cyc t id t di t iw mi (8) t ic t cph t f t r 10% 90% 90% t il
X9314 rev 1.1 11/10/00 characteristics subject to change without notice. 7 of 9 www.xicor.com packaging information 0.118 ?0.002 (3.00 ?0.05) 0.040 ?0.002 (1.02 ?0.05) 0.150 (3.81) ref. 0.193 (4.90) 0.030 (0.76) 0.036 (0.91) 0.032 (0.81) 0.007 (0.18) 0.005 (0.13) 0.008 (0.20) 0.004 (0.10) 0.0216 (0.55) 7?typ. r 0.014 (0.36) 0.118 ?0.002 (3.00 ?0.05) 0.012 + 0.006 / -0.002 (0.30 + 0.15 / -0.05) 0.0256 (0.65) typ. 8-lead miniature small outline gull wing package type m note: 1. all dimensions in inches and (millimeters) 0.220" 0.0256" typical 0.025" typical 0.020" typical 8 places footprint ref.
X9314 rev 1.1 11/10/00 characteristics subject to change without notice. 8 of 9 www.xicor.com packaging information 0.150 (3.80) 0.158 (4.00) 0.228 (5.80) 0.244 (6.20) 0.014 (0.35) 0.019 (0.49) pin 1 pin 1 index 0.010 (0.25) 0.020 (0.50) 0.050 (1.27) 0.188 (4.78) 0.197 (5.00) 0.004 (0.19) 0.010 (0.25) 0.053 (1.35) 0.069 (1.75) (4x) 7 0.016 (0.410) 0.037 (0.937) 0.0075 (0.19) 0.010 (0.25) 0?- 8 x 45 8-lead plastic small outline gull wing package type s note: all dimensions in inches (in p arentheses in millimeters) 0.250" 0.050"typical 0.050" typical 0.030" typical 8 places footprint
X9314 limited warranty devices sold by xicor, inc. are covered by the warranty and patent indemni?ation provisions appearing in its terms of sale onl y. xicor, inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devi ces from patent infringement. xicor, inc. makes no warranty of merchantability or ?ness for any purpose. xicor, inc. reserves the right to discontinue production and change s peci?ations and prices at any time and without notice. xicor, inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a xicor, inc. product. no o ther circuits, patents, or licenses are implied. trademark disclaimer: xicor and the xicor logo are registered trademarks of xicor, inc. autostore, direct write, block lock, serialflash, mps, and xd cp are also trademarks of xicor, inc. all others belong to their respective owners. u.s. patents xicor products are covered by one or more of the following u.s. patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084, 667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. foreign patents and additional patents pending. life related policy in situations where semiconductor component failure may endanger life, system designers using this product should design the sy stem with appropriate error detection and correction, redundancy and back-up features to prevent such an occurence. xicor s products are not authorized for use in critical components in life support devices or systems. 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) sup port or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to res ult in a signi?ant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. rev 1.1 11/10/00 characteristics subject to change without notice. 9 of 9 www.xicor.com ?icor, inc. 2000 patents pending ordering information X9314 xdcp 10k ? , log taper X9314w x x x v cc range blank = v cc = 5v ?0% 3 = v cc = 3v to 5.5v (not available in industrial temperature) temperature range blank = 0? to +70? i = ?0? to +85? package m = 8-lead msop s = 8-lead soic end to end resistance w = 10k ? part mark convention X9314w x blank = 8-lead soic (date code) x blank = 5v ?0%, 0? to 70? i = 5v ?0%, -40? to +85? d = 3v to 5.5v, 0? to 70? e = 3v to 5.5v, -40? to +85?
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