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6732-2.0 5/30/97 t1/c0/d0 sh 1 characteristics subject to change without notice a pplication n ote a v a i l a b l e low noise, low power, 32 taps x9315 e 2 pot tm nonvolatile digital potentiometer features low power cmos ? cc = 2.7v to 5.5v, single supply active current, 50 m a (increment) max active current, 400 m a (store) max standby current, 1 m a max low noise 31 resistive elements temperature compensated 20% end to end resistance range ? ss to v cc range 32 wiper tap points wiper positioned via three-wire interface similar to ttl up/down counter wiper position stored in nonvolatile memory and recalled on power-up 100 year wiper position data retention x9315z = 1k w x9315w = 10k w packages 8-lead soic 8-lead msop 8-pin dip description the xicor x9315 is a solid state "micropower" nonvol- atile potentiometer and is ideal for digitally controlled resistance trimming. the x9315 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 posi- tion 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 sub- sequent power-up operation. the resolution of the x9315 is equal to the maximum resistance value divided by 31. as an example, for the x9315w (10k w ) each tap point represents 323 w . all xicor nonvolatile digital potentiometers are de- signed and tested for applications requiring extended endurance and data retention. functional diagram 5-bit up/down counter 5-bit nonvolatile memor y store and recall control circuitr y one of thirty- two wiper position decoder resistor array vl vw vh u/d inc cs cmos switch 6732 fm1 e 2 pot is a trademark of xicor, inc. an104
x9315 2 pin descriptions v h and v l the high (v h ) and lo w (v l ) ter minals of the x9315 are equiv alent to the x ed ter minals of a mechanical potenti- ometer . the minim um v oltage is v ss and the maxim um is v cc . it should be noted that the ter minology of v l and v h ref erences the relativ e position of the ter minal in relation to wiper mo v ement direction selected b y the u/ d input and not the v oltage potential on the ter minal. v w v w is the wiper ter minal, equiv alent to the mo v ab le ter minal of a mechanical potentiometer . the position of the wiper within the arr a y is deter mined b y the control inputs . the wiper ter minal ser ies resistance is typically 400 w . up/down (u/ d ) the u/ d input controls the direction of the wiper mo v e- ment and whether the counter is incremented or decre- mented. increment ( inc ) the inc input is negativ e-edge tr iggered. t oggling inc will mo v e the wiper and either increment or decrement the counter in the direction indicated b y the logic le v el on the u/ d input. chip select ( cs ) the de vice is selected when the cs input is lo w . the current counter v alue is stored in non v olatile memor y when cs is retur ned high while the inc input is also high. after the store oper ation is complete the x9315 will be placed in the lo w po w er standb y mode until the de vice is selected once again. pin configuration 6732 fm2 pin names 6732 fm t01 symbol description v h high terminal v w wiper terminal v l low terminal v ss ground v cc supply voltage u/ d up/down input inc increment input cs chip select input v cc cs v l v w inc u/ d v h v ss 1 2 3 4 8 7 6 5 x9315 dip/soic /msop
x9315 3 device operation there are three sections of the x9315: the input control, counter and decode section; the non v olatile memor y; and the resistor arr a y . the input control section oper ates just lik e an up/do wn counter . the output of this counter is decoded to tur n on a single electronic s witch connecting a point on the resistor arr a y to the wiper output. under the proper conditions the contents of the counter can be stored in non v olatile memor y and retained f or future use . the resistor arr a y is compr ised of 31 individual resistors connected in ser ies . at either end of the arr a y and betw een each resistor is an electronic s witch that tr ans- f ers the potential at that point to the wiper . the inc , u/ d and cs inputs control the mo v ement of the wiper along the resistor arr a y . with cs set lo w the x9315 is selected and enab led to respond to the u/ d and inc inputs . high to lo w tr ansitions on inc will increment or decrement (depending on the state of the u/ d input) a se v en bit counter . the output of this counter is decoded to select one of thir ty tw o wiper positions along the resistiv e arr a y . the wiper , when at either x ed ter minal, acts lik e its mechanical equiv alent and does not mo v e be y ond the last position. that is , the counter does not wr ap around when cloc k ed to either e xtreme . the v alue of the counter is stored in non v olatile memor y whene v er cs tr ansistions high while the inc input is also high. when the x9315 is po w ered-do wn, the last counter posi- tion stored will be maintained in the non v olatile memor y . when po w er is restored, the contents of the memor y are recalled and the counter is reset to the v alue last stored. operation notes the system ma y select the x9315, mo v e the wiper and deselect the de vice without ha ving to store the latest wiper position in non v olatile memor y . the wiper mo v e- ment is perf or med as descr ibed abo v e; once the ne w position is reached, the system w ould the k eep inc lo w while taking cs high. the ne w wiper position w ould be maintained until changed b y the system or until a po w er- up/do wn cycle recalled the pre viously stored data. this w ould allo w the system to alw a ys po w er-up to a pre- set v alue stored in non v olatile memor y; then dur ing sys- tem oper ation minor adjustments could be made . the adjustments might be based on user pref erence , system par ameter changes due to temper ature dr ift, etc... the state of u/ d ma y be changed while cs remains lo w . this allo ws the host system to enab le the x9315 and then mo v e the wiper up and do wn until the proper tr im is attained. symbol table w a veform inputs outputs must be steady will be steady may change from lo w to high will change from lo w to high may change from high to low will change from high to low don? care: changes allo wed changing: state not kno wn n/a center line is high impedance 6732 fm 3
x9315 4 absolute maximum ratings* t emper ature under bias ......................... ?5 c to +135 c stor age t emper ature .............................. ?5 c to +150 c v oltage on cs , inc , u/ d v h , v l and v cc with respect to v ss .................................. ?v to +7v d v = |v h ? l | ................................................................. 5v lead t emper ature (solder ing 10 seconds) ............. 300 c wiper current ........................................................... 1ma *comment stresses abo v e those listed under ?bsolute maxim um ratings ma y cause per manent damage to the de vice . this is a stress r ating only and the functional oper ation of the de vice at these or an y other conditions abo v e those listed in the oper ational sections of this speci cation is not implied. analog characteristics electrical characteristics t emper ature under bias ......................... ?5 c to +135 c end-to-end resistance t oler ance .......................... 20% p o w er rating at 25 c .............................................. 10mw wiper current ................................................. 1ma max. t ypical wiper resistance ............................ 400 w at 1ma t ypical noise .................................. < ?40db ? hz ref: 1v resolution resistance ................................................................... 3% linearity absolute linear ity (1) ........................................... 1.0 ml (2) relativ e linear ity (3) ........................................... 0.2 ml (2) temperature coefficient (?0 c to +85 c) .............................. +300 ppm/ c t ypical ratiometr ic t emper ature coef cient .................. 20 ppm wiper adjustability unlimited wiper adjustment (non-store oper ation) wiper p osition store oper ations .......................... 100,000 physical characteristics marking includes manufacturer? trademark resistance value or code date code test circuit #2 6732 fm 5 force current v l v w v h test point test circuit #1 6732 fm 4 test point v w v h v l notes: (1) absolute linear ity is utiliz ed to deter mine actual wiper v oltage v ersus e xpected v oltage = (v w(n) (actual) ? v w(n) (e xpected)) = 1 ml maxim um. (2) 1 ml = minim um increment = r t o t /31. (3) relativ e linear ity is a measure of the error in step siz e betw een taps = v w(n+1) ?[v w(n) + ml] = +0.2 ml.
x9315 5 recommended operating conditions 6732 pgm t02 6732 pgm t03 temperature min. max. commercial 0 c +70 c industrial ?0 c +85 c supply voltage limits x9315 5v 10% x9315-2.7 2.7v to 5.5v d.c. operating characteristics (over recommended operating conditions unless otherwise specified.) 6732 pgm t04 standard parts 6732 pgm t05 notes: (4) t ypical v alues are f or t a = 25 c and nominal supply v oltage . (5) this par ameter is per iodically sampled and not 100% tested. symbol parameter limits units test conditions min. typ. (4) max. i cc1 v cc active current (increment) 50 m a cs = v il , u/ d = v il or v ih and inc = 0.4v/2.4v @ max. t cyc i cc2 v cc active current (store) 400 m a cs = v ih , u/ d = v il or v ih and inc = v ih i sb standby supply current 1 m a cs = v cc ?0.3v, u/ d and inc = v ss or v cc ?0.3v i li cs , inc , u/ d input 10 m a v in = v ss to v cc leakage current v ih cs , inc , u/ d input 2 v cc + 1 v high voltage v il cs , inc , u/ d input ?.5 0.8 v low voltage r w wiper resistence 400 1000 w max. wiper current 1ma v vh vh terminal voltage v ss v cc v v vl vl terminal voltage v ss v cc v c in (5) cs , inc , u/ d input 10 pf v cc = 5v, v in = v ss , capacitance t a = 25 c, f = 1mhz part number maximum resistance wiper increments minimum resistance x9315z 1k w 32.3 w 100 w x9315w 10k w 323 w 100 w
x9315 6 a.c. conditions of test 6732 pgm t06 mode selection 6732 pgm t07 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 a.c. operating characteristics (over recommended operating conditions unless otherwise specified) 6732 pgm t08 a.c. timing notes: (6) t ypical v alues are f or t a = 25 c and nominal supply v oltage . (7) this par ameter is per iodically sampled and not 100% tested. (8) mi in the a.c . timing diag r am ref ers to the minim um incremental change in the v w output due to a change in the wiper position. limits symbol parameter min. typ. (6) max. units 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 m s t ll inc low period 1 m s t lh inc high period 1 m s t lc inc inactive to cs inactive 1 m s t cph cs deselect time (no store) 100 ns t iw inc to vw change 1 5 m s t cyc inc cycle time 4 m s t r , t f (7) inc input rise and fall time 500 m s t pu (7) power up to wiper stable 5 m s t r v cc (7) v cc power-up rate 0.2 50 mv/ m s t wr store cycle 5 10 ms 6732 fm 06 cs inc u/ d v w t ci t il t ih t cyc t id t di t iw mi (8) t ic t cph t f t r 10% 90% 90%
x9315 7 typical noise typical rtotal vs. temperature
x9315 8 typical total resistance temperature coefficient typical wiper resistance -55 -350 -300 -250 -200 -150 -100 -50 0 -45 -35 -25 -15 -5 5 15 25 35 t emperature ppm 45 55 65 75 85 95 105 115 125 c 0 0 100 200 300 400 rw (ohms) 500 600 700 800 2 4 6 8 10 12 14 16 t ap 18 20 22 24 26 28 30 32
x9315 9 typical absolute % error per tap position typical relative % error per tap position 40.0% 30.0% 20.0% 10.0% 0.0% -10.0% -20.0% -30.0% -40.0% 0 3 6 9 12 15 t ap absolute % error 18 21 24 27 30 20.0% 15.0% 10.0% 5.0% 0.0% -5.0% -10.0% -15.0% -20.0% 0 3 6 9 12 15 t ap relative % error 18 21 24 27 30
x9315 10 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) ref . 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 no te: 1. all dimensions in inches and (millimeters) 3003 ill 01
x9315 11 packaging information no te: 1. all dimensions in inches (in parentheses in millimeters) 2. package dimensions exclude molding flash 0.020 (0.51) 0.016 (0.41) 0.150 (3.81) 0.125 (3.18) 0.1 10 (2.79) 0.090 (2.29) 0.430 (10.92) 0.360 (9.14) 0.300 (7.62) ref . pin 1 index 0.145 (3.68) 0.128 (3.25) 0.025 (0.64) 0.015 (0.38) pin 1 sea ting plane 0.065 (1.65) 0.045 (1.14) 0.260 (6.60) 0.240 (6.10) 0.060 (1.52) 0.020 (0.51) typ . 0.010 (0.25) 0 15 8-lead plastic du al in-line p a cka ge type p half shoulder width on all end pins optional 0.015 (0.38) max. 0.325 (8.25) 0.300 (7.62)
x9315 12 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 p ackage 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
x9315 13 ordering information limited w arranty de vices sold b y xicor , inc. are co v ered b y the w arr anty and patent indemni cation pro visions appear ing in its t er ms of sale only . xicor , inc. mak es no w arr anty , e xpress , statutor y , implied, or b y descr iption regarding the inf or mation set f or th herein or regarding the freedom of the descr ibed de vices from patent infr ingement. xicor , inc. mak es no w arr anty of merchantability or tness f or an y pur pose . xicor , inc. reser v es the r ight to discontin ue production and change speci cations and pr ices at an y time and without notice . xicor , inc. assumes no responsibility f or the use of an y circuitr y other than circuitr y embodied in a xicor , inc. product. no other circuits , patents , licenses are implied. u .s. p a tents xicor products are co v ered b y one or more of the f ollo wing u .s . p atents: 4,263,664; 4,274,012; 4,300,212; 4,314,265; 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. f oreign patents and additional patents pending. life rela ted policy in situations where semiconductor component f ailure ma y endanger lif e , system designers using this product should design the system with appropr iate error detection and correction, redundancy and bac k-up f eatures to pre v ent such an occurence . xicor s products are not author iz ed f or use in cr itical components in lif e suppor t de vices or systems . 1. lif e suppor t de vices or systems are de vices or systems which, (a) are intended f or surgical implant into the body , or (b) suppor t or sustain lif e , and whose f ailure to perf or m, when proper ly used in accordance with instr uctions f or use pro vided in the labeling, can be reasonab ly e xpected to result in a signi cant injur y to the user . 2. a cr itical component is an y component of a lif e suppor t de vice or system whose f ailure to perf or m can be reasonab ly e xpected to cause the f ailure of the lif e suppor t de vice or system, or to aff ect its saf ety or eff ectiv eness . v cc limits blank = 5v 10% ?.7 = 2.7v to 5.5v t emperature rang e blank = commercial = 0 c to +70 c i = industr ial = ?0 c to +85 c p ac ka g e m = 8-lead msop p = 8-lead plastic dip s = 8-lead soic end to end resistance z = 1k w w = 10k w x9315x x x x

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