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product specification ixd 3220/i xd3221 ps03 41 01 - 0515 preliminary 1 16v input voltage step - down dc/dc controller features ? operating input voltage range : 2.8v ~ 16.0v ? output voltage range externally set : > 1.2v ? output current : up to 3a ? reference voltage : 0.9v 1.5% ? oscillation frequency : 300 khz, 500 khz and 1 mhz ? operating mode: pwm ( IXD3220 ) or pwm/pfm automatically switching ( ixd3221 ) ? soft start: 4 ms internal ( IXD3220 a/221a) or > 4 ms externally set ( IXD3220 b/221b) ? protection: integral an d short ci r cuit ? small package : sot - 25, usp - 6c application ? set top boxes ? digital tvs ? dvd/hdd recorders ? various portable equipment description the IXD3220 /221 series are multi - purpose step - down dc/dc controllers , which require only a transistor, a coil, a diode, and two capacitors connected externally to create a high efficiency stable power supply with output current up to 3a. low esr ceramic capacitor s can be used as an output capacitor. the IXD3220 /221 series has a 0. 9 v (1.5 %) reference voltage, which allows set output voltage in wide range using external resistive divider. s witching frequency of 300 khz , 500 khz , and 1.0 mhz allows use of small external components . the IXD3220 series utilize pwm mode, while the ixd3221 series utilize either pwm or pfm mode , a utomatically switch ing from pwm to pfm at light loads to achieve high efficienc y over a wide range of load conditions. t he IXD3220 /2 21 series a and c versions have soft start function internally set to 4 ms , a nd the IXD3220 /221 series b and d versions allow set - up soft start externally. t he built - in uvlo (under voltage lock out) function forces the external p - channel transistor in off state when input voltage becomes 2.3v or lower. if the fb pin is shorted to the ground or the output voltage drops rapidly because of overload , resulting in v fb < 0.7 v , the external p - channel transistor is forced off and latched in this state . the latching state does not mean a complete shutdown, but a state in which pulse output is suspended; but the internal circuitry remains in operation. t o restart circuit, either vin or ce pin should be triggered . integral protection circuit monitors the du ty cycle at ext pin. in case of high load, w hen duty cycle ratio exceed maximum allowed value a certain amount of time ( t pro ), the ext pin latches at high level and keeps the external p - channel transistor in off state. to restart circuit, either vin or ce pin should be triggered. for the applications with small dropout voltage , working close to maximum allowed duty cycle ratio , the IXD3220 /221 series c or d versions without the integral protection are recommended. typical application circuit typical performance characteristic efficiency vs. output current ixd3221 a095mr - v out = 3.3 v, f osc = 500 khz, c in = c l = 47 f (os - con) , l = 10 h (cdrh8d43, ( sumida), q - cph3308 , c fb =1.0 f (ceramic), r fb =10 r s requires with low esr ( ceramic ) capacitors used as c l neither t antalum or aluminum capacitors require r s
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 2 absolute maximum rat ings parameter symbol ratings units v in pin voltage v in C 0.3 ~ 1 8 .0 v fb pin voltage v rb C 0.3 ~ 1 8 .0 v ce/c ss pin voltage ce C 0.3 ~ 18.0 v ext pin voltage v ext v ss C 0.3 ~ v out + 0.3 v ext pin current i ext 100 ma power dissipation sot - 25 p d 250 mw usp - 6c 100 operating temperature range t opr C 40 ~ + 85 0 c storage temperature range t stg C 55 ~ +125 0 c electrical operating characteristics IXD3220 /221 a and c versions unless otherwise specified, v in = 5 v, ta = 25 0 c parameter symbol conditions min. typ. max. unit circuit fb voltage v fb 0.8865 0.9000 0.9135 v ? input voltage range v in 2.8 - 16.0 v uvlo voltage (minimum operating voltage) v uvlo 1.9 2.3 2.7 v ? supply current 2 i dd2 v in = 5.0 v, v fb = 1.0 v ** a ? standby current i stb 0.1 1 a ? oscillation frequency f osc connected to external components ** khz ? maximum duty cycle ratio d max 100 - - % ? pfm duty cycle ratio d pfm no load ixd3221 series only 15 25 35 % ? ext h on resistance r exth 6 10 16 ? ? ext l on resistance r extl 6 12 20 ? ? integral protection time (*2) t pro IXD3220 /221 a series ** ms ? short - circuit protection v shrt 0 . 7 v ? soft - start time t ss ** ms ? efficiency (*1) eff1 92 % ? fb voltage temperature characteristics 100 ppm/ 0 c ? ce high voltage v ceh 1.2 v ? ce low voltage v cel 0.3 v ? ce high current i ceh v in = v ce = 16 v - 0.1 0.1 a ? ce low current i cel v in = 16 v, v ce = 0 v - 0.1 0.1 a ? fb high current i fbh v in = v ce = 16 v - 0.1 0.1 a ? fb low current i fbl v in = 16 v, v ce = 0 v - 0.1 0.1 a ? note: *1: eff1 = {( output voltage) x (output current)} / {( input voltage) x (input current )} x 100 *2: no integral protection function is available with the IXD3220 /221 c series. ** refer to the characteristics chart by oscillation frequency
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 3 electrical operating characteristics (c ontinued ) IXD3220 /221 b and d versions unless otherwise specified, v in = 5 v, ta = 25 0 c parameter symbol conditions min. typ. max. unit circuit fb voltage v fb 0.8865 0.9000 0.9135 v ? input voltage range v in 2.8 - 16.0 v uvlo voltage (minimum operating voltage) v uvlo 1.9 2.3 2.7 v ? supply current 2 i dd2 v in = 5.0 v, v fb = 1.0 v ** a ? standby current i stb 0.1 1 a ? oscillation frequency f osc connected to external components ** khz ? maximum duty cycle ratio d max 100 - - % ? pfm duty cycle ratio d pfm no load ixd3221 series only 15 25 35 % ? ext h on resistance r exth 6 10 16 ? ? ext l on resistance r extl 6 12 20 ? ? integral protection time (* 4 ) t pro IXD3220 /221 b series ** ms ? short - circuit protection v shrt 0 . 7 v ? soft - start time t ss connected to r ss and c ss 5.0 10.0 2 0 . 0 ms ? internal soft - start time (*1) t ss_int ** ms ? efficiency (* 2 ) eff1 92 % ? fb voltage temperature characteristics 100 ppm/ 0 c ? ce high voltage (*3) v ceh 2.6 v ? ce low voltage v cel 0.3 v ? ce high current i ceh v in = v ce = 16 v - 0.1 0.1 a ? ce low current i cel v in = 16 v, v ce = 0 v - 0.1 0.1 a ? fb high current i fbh v in = v ce = 16 v - 0.1 0.1 a ? fb low current i fbl v in = 16 v, v ce = 0 v - 0.1 0.1 a ? note: external components: c ss = 0.1 f, r ss = 200 k? *1 - in case where the uvlo function operates temporarily due to the power cutoff etc. , when an external c ss is charged (vce > 2.6 v), the ic restarts operation by the internal soft - start time. minimum value of soft - s tart time set externally is equal to the internal soft - start time. *2: effi = {( output voltage) x (output current )} / {( input voltage) x (input current )} x 100 *3: the integral latch and short - circuit protection do not function when the ce/c ss pin voltage is lower than 2.6 v during the soft - start time. *4: no integral protection function is available with the IXD3220 /221 d series. ** refer to the characteristics chart by oscillation frequency. characteristics chart by oscillation frequecy parameter symbol 300khz 500khz 1.0mhz units min. typ. max. min. typ. max. min. typ. max. supply current 2 i dd2 - 25 50 - 25 50 - 40 80 a oscillation frequency f osc 255 300 345 425 500 575 850 1000 1150 khz integral protection time t pro 0.5 1.0 2.0 0.5 1.0 2.0 0.25 0.50 1.00 ms soft - start time t ss 2 3 8 2 4 8 1 2 4 ms
prod uct specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 4 pin configura tion pin assignment pin number pin name functions sot - 2 5 usp - 6c 1 6 ce/c ss chip enable/soft start (logic high C ic operating, logic low C ic in off state) 2 5 v ss ground 3 4 fb output voltage sense 4 3 ext external transistor drive - 2 nc no connection 5 1 v in power supply block diagram s IXD3220 /221 a and c versions IXD3220 /221 b and d versions basic operation the IXD3220 /221 series ics contain a reference voltage source, ramp wave circuit, error amplifier, pwm comparator, phase compensation circuit, protection circuits, uvlo circuit , and others. ic s error amplifier compares the internal reference voltage with the feedback voltage from the v out pin divided by external resistive divider . phase compensat ed signal from error amplifier s o utput applies to the inverting pwm comparator s input , which non - inverting input is connected to the output of the ramp wave circuit . resulting pwm modulated signal from comparator determin es turn - on time . it applie s to the buffer, which drive s gate of the external mosfet. t his process perform s continuously to ensure stable output voltage by changing duty cycle of pwm pulses in respect to error signal . reference voltage source the reference voltage source provides the reference voltage to ensure stable output voltage of the dc/dc converter. oscillator the oscillator determines fixed switching frequency , which can be selected from 300 khz, 500 khz , and 1.0 mhz clock pulses generated in this circuit are used to produce ramp waveforms needed for pwm operation, and to synchronize all internal circuits. the dissipation pad for the usp - 6c package should be solder - plated in recommended mount pattern and metal masking to enhance mounting strength and heat release. if the pad needs to be connected to other pins, it should be connected to the pin no.1.
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 5 error amplifier the error amplifier compares reference voltage with the fb pin voltage. when a feedback voltage is lower than the reference voltage, output voltage increases , resulting in longer on time of the switching mosfet . the gain and frequency characteristics of the error amplifier are set internally to deliver an optimized signal to the pwm comparator. control methods the IXD3220 series ics utilize pwm control, while the ixd3221 series ics use either pwm or pfm control automatic ally changing mode. t he IXD3220 series ics provide a constant switching frequency disregard to load. when a switching frequency noise is a concern, it is easy to filter it, since the frequency is fixed. however , the efficiency at light load may f all. t he ixd3221 series ic provide high efficiency at wide range of load, using pfm mode at light and pwm mode at heavy load , automatic ally chang ing mode . if inductor current becomes discontinuous at light load and duty cycle intends to be less than 25% , the ixd3221 switches to pfm mode with duty cycle fixed at 25%. it increases efficiency at light load, but switching frequency at this mode depend s on load. if noise at switching frequency is a concern, filtering circuitry should be designed for full specte r of switching frequency. uvlo (under voltage lock out) when the input voltage falls to 2.3 v or lower, uvlo circuitry becomes active. it forces external p - channel mosfet in off state and resets internal circuitry. when input voltage restores above uvlo va lue, ic resumes normal operation with internal soft start (disregard to the existence of the external soft start circuitry at IXD3220 /221b and d versions) soft - start time the IXD3220 /221b and d series can adjust the soft - start time externally via the ce pin. the soft - start function operates until the ce pin voltage rises above 2.6 v. please refer to the following equation for calculating the soft - start time. t ss = - c ss x r ss x in {( v ce C 2.2) / v ce } minimum soft - start time is equal to the time set internally.
prod uct specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 6 circuit example 1 circuit example 2 circuit example 3 n - channel open drain cmos logic (low current dissipation) cmos logic (low current dissipation, quick off) protection circuits integral protection circuit (latch ing type) t he IXD3220 /221 a and b series utilize integral protection circuitry, which monitors maximum duty cycle. if at high load duty cycle exceeds d max value longer than t pro time window, ext pin latches in high state disabling external p - channel mosfet. to resume normal ic operation either v in or ce pins should be toggled to restart ic through soft start. the latching state does not mean a complete shutdown, but a state in wh ich pulse output is suspended; therefore, the internal circuitry remains in operation. if duty cycle may exceed d max value due normal variations in load, IXD3220 /221 c and d versions without integral protection circuitry are recommended. short - circuit protection circuit (latching type) when the fb pin is shorted to the ground or the output voltage drops rapidly because of overload, ext pin latches in high state disabling external p - channel mosfet, as in the case with the integral protection circuit. the protection circuit operates when fb voltage becomes 0.7 v or lower. to resume normal ic operation either v in or ce pins should be toggled to restart ic through soft start.
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 7 output voltage setting external resistive divider can set output voltage as v out = 0.9 x (r fb1 + r fb2 ) / r fb2 , where r fb1 and rfb2 are values of divider resistors. the sum of r fb1 and r fb2 should be 1m or less. the value of c fb , speed - up capacitor for phase compensation, is equal c fb = 1 / (2 x r fb1 x f zfb ) , where f zfb is usually 5 khz. however, some a djustments from 1 khz to 20 khz may require depending on the application, value of the inductance (l), and output capaci tor (c l ). example : setting 3.3 v v out r fb1 = 200 k , r fb2 =75 k , v out = 0.9 x (200k + 75 k) / 75 k = 3.300 v c fb = 1 / (2 x 200 k x 5 k) =150 pf typical examples v out , (v) r fb1 , (k ) r fb2 , (k ) c fb , (pf) v out , (v) r fb1 , (k ) r fb2 , (k ) c fb , (pf) 1.2 100 300 330 3.3 200 75 150 1.5 180 270 180 5.0 150 33 220 1.8 220 220 150 12.0 160 13 180 typical application circuit external components q - p - ch annel mosfet: 2sj646 (sanyo) d - de5pc3 (shindengen) l - cdrh8d28 - 4r7 (4.7h, sumida / fosc=1.0mhz) cdrh8d43 - 100 (10h, sumida / fosc=500khz) cdrh127 - 220 (22h, sumida / fosc=300khz) c in C 22 f (ceramic) c l C 22 f (ceramic / f osc = 1.0 mhz, 500khz) 47f (ceramic / f osc = 300 khz) r sense C 100 m (v out < 2.5 v) 50 m (v out > 2.5 v) external componen ts recommended mosfet s and diodes (examples) i out u p to 500 ma up to 1 a u[p to 2 a up to 3 a p - ch annel mosfet (*1) cph3308 (sanyo) 2sj616 (sanyo) 2sj646 (sanyo) schottky barrier diode (*2) xb01sb04a2br (torex) d1fh3 (shindengen) cms02 (toshiba) de5pc3 (shindengen) *1: recommended to use p - ch annel mosfet with ciss less than 1500 pf *2: diode should be used with high - toned reverse characteristics use of ceramic capacitor s with the IXD3220 /221 series, a ceramic capacitor can be used as an output capacitor (c l ). r sense resistor is required for using the ceramic capacitor. the value of r sense resistor is determined depending on the setting output voltage shown in the table below.
prod uct specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 8 output voltage r sense (m ) v out < 2.5 v 100 v out > 2.5 v 50 selecting inductor recommended inductance by oscillation frequency is shown in the chart below. f osc , khz l , h 300 22 500 10 1000 4.7 it is recommended to increase inductance at high load to reduce inductance peak current and improve system stability. i pk_ac = (v in C v out ) x v out / (v in x l x f osc ) , where l is an i nductance value , and f osc is an o scillation frequency . inductor peak current should not exceed the coil rating. inductor peak current is equal i pk = i out + i pk_ac / 2 layout and use considerations 1. wire external components as close to the ic as possible and use thick, short connecting traces to reduce the circuit impedance. 2. please, pay special attention to the strengthening of vin and vss wiring. switching noise , which occurs from the gnd , may cause the instability of the ic. for that matter, it is recommended to connect r in (about 10 ) and c dd (about 1 f) to the v in pin if v in voltage is high and noise is high. 3. the IXD3220 /221 series are designed to work with ceramic output capacitor s . h owever, the significant difference between input and output voltages may require capacitors with high capacitance unavailable in ceramic. we recommend use of tantalum or aluminum capacitor s instead to avoid oscillation due low output capacitance. 4. emi and output ripple voltage of switching regulator s greatly influenced by external component s , such as the induct ors , capacit ors, diodes, as well as board layout. c ompleted design with actual components should be verified, if it matches requirements . 5. at the significant difference between input and output voltages and light load, ic with pwm mode only , may generate very narrow pulses at ext pin , and there is the possibility that some cycles will be skipped completely. 6. at the low difference between inpu t and output voltages and heavy load, ic may generate very wide pulses , and there is the possibility that some cycles will be skipped completely. 7. if IXD3220 /221 series are us ed with the ce pin pull ed up to the v in , please , pay attention to the rising time of the v in voltage. if the rising time of the v in voltage is much slower than the internal soft - start time, the short circuit protection may start operate , disabling output , earlier than v in voltage stabilizes . if you are using the a or the c series, please , use a voltage detector or something similar to check that the input voltage rises fully. then, start the ic via the ce pin. if you do n o t want to use an additional detector in this way, we recommend use of the b or d series, adjusting the soft - star t period externally , so that the v in voltage rises fully before the soft - start is completed. 8. use of the ic at voltages below the recommended minimum operating voltage may lead to instability. 9. t ransitional voltage drop or voltage rising may create ic malfun ction , sending ac in latch up mode , if ratings are exceeded ,
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 9 test circuits circuit ? circuit ? circuit ? circuit ? circuit ? external components circuit ? circuit ? c in = 1 f, 16v ( ceramic ) c in = 47 f, 16v (tantalum) c l = 47 f, 16v (tantalum ) circuit ? l = 4.7 h at f osc = 1000 khz c in = 1 f, 16v ( ceramic ) l = 10 h at f osc = 500 khz l = 22 h at f osc = 300 khz
prod uct specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 10 typical performance characteristics (1) efficiency vs. output current topr = 25 0 c IXD3220 /21x095xx q - 2sj646, d - de5pc3, l - cdrh127 - 10 h, c in =10 f(ceramic), c l = 47 f (ceramic), r sense = 50 m ? , v in = 12 v, v out = 5 v IXD3220 /21x095xx q - 2sj646, d - de5pc3, l - cdrh127 C 10 h, c in = 10 f (ceramic), c l = 47 f (ceramic), r sense = 50 m ? , v out = 3.3 v (2) output voltage vs. output current IXD3220 /21x095xx q - 2sj646, d - de5pc3, l - cdrh127 - 10 h, c in =10 f(ceramic), c l = 47 f (ceramic), r sense = 50 m ? , v in = 12 v, v out = 5 v IXD3220 /21x095xx q - 2sj646, d - de5pc3, l - cdrh127 C 10 h, c in = 10 f (ceramic), c l = 47 f (ceramic), r sense = 50 m ? , v out = 3.3 v (3) output ripple voltage vs. output current IXD3220 /21x095xx q - 2sj646, d - de5pc3, l - cdrh127 - 10 h, c in =10 f(ceramic), c l = 47 f (ceramic), r sense = 50 m ? , v in = 12 v, v out = 5 v IXD3220 /21x095xx q - 2sj646, d - de5pc3, l - cdrh127 C 10 h, c in = 10 f (ceramic), c l = 47 f (ceramic), r sense = 50 m ? , v out = 3.3 v
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 11 typical performance characteristics (continued) (4) fb voltage temperature characteristics (5) fb voltage vs. input voltage IXD3220 /221 series v in =5 v IXD3220 /221 series (6) input voltage temperature characteristics (7) supply current vs. input voltage IXD3220 /221 series vi n =5v, f osc = 300 k hz , 500 khz IXD3220 /221 series f osc = 300 k hz , 500 khz (8) oscillation frequency temperature characteristics (9) uvlo temperature characteristics IXD3220 /221x095xx v in = 5 v IXD3220 /221 series
prod uct specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 12 typical performance characteristics (continued) (10) ext h on resistance characteristics (11) ext l on resistance characteristics IXD3220 /221 series IXD3220 /221 series (12) soft - start time temperature characteristics IXD3220 /221 series v in = 5 v, f osc = 300 k hz ,500 khz IXD3220 /221 series v in = 5 v, f osc = 1.0mhz (13) integral protection time temperature characteristics IXD3220 /21a, b series v in = 5 v, f osc = 300 khz,500 khz IXD3220 /21a, b series v in = 5 v, f osc = 1.0mhz
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 13 typical performance characteristics (continued) (14) short - circuit protection temperature characteristics (15) short - circuit protection voltage vs. input voltage IXD3220 /221 series v in = 5 v IXD3220 /221 series (16 ) ce threshold temperature characteristics (1 7 ) ce threshold vs. input voltage IXD3220 /221 series v in = 5 v IXD3220 /221 series
prod uct specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 14 typical performance characteristics (continued) (1 8 ) load transient response characteristic xc9220x095xx (500khz, pwm control) q - 2sj616 (sanyo), d - d1fh3 (shindengen), l = 10 h cdrh8d43, (sumida), c in = c l = 47 f (os - con) i out = 0.1ma 1000 ma v in = 5.0 v, v out = 3.3 v, v out = 100mv/div., time = 50 s/div. v in = 5.0 v, v out = 3.3 v, v out = 100mv/div., time = 1 0 m s/div. i out = 0.1ma 1000 ma v in = 10 .0 v, v out = 3.3 v, v out = 100mv/div., time = 50 s/div. v in = 10 .0 v, v out = 3.3 v, v out = 100mv/div., time = 1 0 m s/div. i out = 100 ma 3 000 ma v in = 10 .0 v, v out = 3.3 v, v out = 100mv/div., time = 50 s/div. v in = 10 .0 v, v out = 3.3 v, v out = 100mv/div., time = 1 0 m s/div
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 15 ordering information IXD3220 ????? - - p wm control ixd3221 ????? - - p w m /pfm automatic switching control designator description symbol description ? type of dc/dc controller a soft start internally set with integral protection function b soft start externally set with integral protection function c soft start internally set without integral protection function d soft start externally set without integral protection function ? ? output voltage 09 feedback voltage (fixed) ? oscillation frequency 3 3 00khz 5 500 khz a 1.0 mhz ? ? - ? * packages (order limit) mr sot - 25 (3,000/reel) mr - g sot - 2 5 (3 , 000/reel) er usp - 6c (3,000/reel) er - g usp - 6c (3,000/reel) (*) t he - g suffix denotes halogen and antimony free , as well as being fully rohs compliant . product classification product version a b c d soft start externaly set no yes no yes integral protection function yes yes no no
prod uct specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 16 package drawing and dimensions sot - 25 usp - 6c usp - 6c reference pattern layout usp - 6c reference metal mask design
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 17 marking sot - 25 represents product series mark product series m IXD3220 x xxxxx n ixd3221 x xxxxx represents product types mark function product series a soft start internally set with integral protection function ixd 3 22xaxxxxx b soft start externally set with integral protection function ixd 3 22x b xxxxx c soft start internally set without integral protection function ixd 3 22x cx xxxx d soft start externally set without integral protection function ixd 3 22x d xxxxx represents oscillation frequency mark oscillation frequency product series 3 300 khz ixd 3 22xxx3xx 5 500 khz ixd 3 22xxx 5 xx a 1.0 mhz ixd 3 22x x x a xx represents production lot number 0 to 9, a to z repeated (g, i, j, o, q, w excluded) usp - 6c represents product series mark product series 1 IXD3220 xxx xxx d ixd3221 xxx xxx represents product type mark function product series a soft start internally set with integral protection function ixd 3 22xaxxxxx b soft start externally set with integral protection function ixd 3 22x b xxxxx c soft start internally set without integral protection function ixd 3 22x cx xxxx d soft start externally set without integral protection function ixd 3 22x d xxxxx represent fb voltage represents oscillation frequency mark oscillation frequency product series 3 300 khz ixd 3 22xxx3xx 5 500 khz ixd 3 22xxx 5 xx a 1.0 mhz ixd 3 22x x x a xx represents production lot number 0 to 9, a to z repeated (g, i, j, o, q, w excluded) mark fb voltage product series 0 9 0.9 v ixd 3 22xx09xxx
product specification IXD3220/ixd3221 ps03 41 01 - 0515 preliminary 18 customer support to share comments, get your technical questions answered, or report issues you may be experiencing with our products, please visit zilogs technical support page at http://support.zilog.com . to learn more about this product, find add itional documentation, or to discover other fac - ets about zilog product offerings, please visit the zilog knowledge base at http:// zilog.com/kb or consider participating in the zilog forum at http://zilog.com/forum . this publication is subject to replacem ent by a later edition. to determine whether a later edition exists, please visit the zilog website at http://www.zilog.com . warning: do not use this product in life support systems. life support policy zilogs products are not authorized for use as critical components in life support devices or systems without the express prior written approval of the president and general counsel of zilog corporation. as used herein life support devices or systems are devices w hich (a) are intended for surgical implant into the body, or (b) support 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 result in a significant injury to the user. a critical component is any component in 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. document di sclaimer ?2015 zilog, inc. all rights reserved. information in this publication concerning the devices, applications, or technology described is intended to suggest possible uses and may be superseded. zilog, inc. does not assume liability for or provide a representation of accuracy of the information, devices, or technology described in this document. zilog also does not assume liability for intellectual property infringement related in any manner to use of information, devices, or technology described her ein or otherwise. the information contained within this document has been verified according to the general principles of electrical and mechanical engineering.

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