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cy22050, cy220501 one-pll general-purpose flash-programmable clock generator cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document #: 38-07006 rev. *k revised september 8, 2011 one-pll general-purpose flash-programmable clock generator features integrated phase-locked loop (pll) commercial and industrial operation flash-programmable field-programmable low-skew, low-jitter, high-accuracy outputs 3.3 v operation with 2.5 v output option 16-pin tssop package (cy22050) 16-pin tssop package with nipdau lead finish (cy220501) input frequency range: ? 8 mhz?30 mhz (external crystal) ? 1 mhz?133 mhz (driven clock) output frequency range: ? commercial temperature ? 80 khz?200 mhz (3.3 v) ? 80 khz?166.6 mhz (2.5 v) ? industrial temperature ? 80 khz?166.6 mhz (3.3 v) ? 80 khz?150 mhz (2.5 v) functional description the cy22050 is programmable clock generator for use in networking, telecommunication, datacom, and other general-purpose applications. the cy22050 offers up to six configurable outputs in a 16-pin tssop, running off a 3.3 v power supply. the on-chip reference oscillator is designed to run off an 8?30-mhz crystal, or a 1?133-mhz external clock signal. the cy22050 has a single pll driving 6 programmable output clocks. the output clocks are derived from the pll or the reference frequency (ref). output post dividers are available for either. four of the outputs can be set as 3.3 v or 2.5 v, for use in a wide variety of portable and low-power applications. the cy220501 is the cy22050 with nipdau lead finish. xin xout divider pll osc. lclk3 q p vco vddl avss ? avdd vss lclk2 lclk4 clk5 clk6 vssl vdd bank 1 divider bank 2 output select oe pwrdwn lclk1 matrix logic block diagram [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 2 of 14 contents pin configuration ............................................................. 3 pin definitions .................................................................. 3 programming description ............................................... 4 field programming the cy22050f .......... ........... ......... 4 cyberclocks ? software .............................................. 4 cy3672 development kit ............................................ 4 applications ...................................................................... 4 controlling jitter .......................................................... 4 cy22050 frequency calculation .............. .............. ......... 5 clock output settings: crosspoint switch matrix ........ 5 reference crystal input ................................................... 6 crystal drive level and power .................................... 6 absolute maximum conditions ....................................... 6 recommended operating conditions ............................ 7 recommended crystal specifications ........................... 7 dc electrical characteristics .......................................... 8 ac electrical characteristics .......................................... 8 test circuit ........................................................................ 9 switching waveforms ...................................................... 9 ordering information ...................................................... 10 possible configurations ............................................. 10 ordering code definitions ..... .................................... 10 16-pin tssop package characte ristics ...... ............ ..... 11 package drawing and dimensions ............................... 11 acronyms ........................................................................ 12 document conventions ................................................. 12 units of measure ....................................................... 12 document history page ................................................. 13 sales, solutions, and legal information ...................... 14 worldwide sales and design s upport ......... .............. 14 products .................................................................... 14 psoc solutions ......................................................... 14 [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 3 of 14 pin configuration figure 1. 16-pin tssop 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 vss vssl oe lclk1 xin xout vdd pwrdwn avss lclk3 lclk2 clk6 clk5 avdd vddl lclk4 pin definitions name pin number description xin 1 reference input. driven by a crystal (8 mh z?30 mhz) or external clock (1 mhz?133 mhz). programmable input load capacitors allow for maximum flexibility in selecting a crystal, based on manufacturer, process, performance, or quality. vdd 2 3.3 v voltage supply avdd 3 3.3 v analog voltage supply pwrdwn [1] 4 power down. when pin 4 is driven low, the cy22050 goes into shut down mode. avss 5 analog ground vssl 6 lclk ground lclk1 7 configurable clock output 1 at v ddl level (3.3 v or 2.5 v) lclk2 8 configurable clock output 2 at v ddl level (3.3 v or 2.5 v) lclk3 9 configurable clock output 3 at v ddl level (3.3 v or 2.5 v) oe [1] 10 output enable. when pin 10 is driven low, all outputs are three-stated. vddl 11 lclk voltage supply (2.5 v or 3.3 v) lclk4 12 configurable clock output 4 at v ddl level (3.3 v or 2.5 v) vss 13 ground clk5 14 configurable clock output 5 (3.3 v) clk6 15 configurable clock output 6 (3.3 v) xout [2] 16 reference output notes 1. the cy22050 has no internal pull up or pull down resistors. pwrdwn and oe pins need to be driven as appropriate or tied to power or ground. 2. float xout if xin is driven by an external clock source. [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 4 of 14 programming description field programming the cy22050f the cy22050 is programmed at the package level, that is, in a programmer socket, prior to installation on a pcb. the cy22050 is flash-technology based, so the parts can be reprogrammed up to 100 times. this allows for fast and easy design changes and product updates, and eliminates any issues with old and out-of-date inventory. samples and small prototype q uantities can be programmed on the cy3672 programmer. cypress?s value-added distribution partners and third-party programming systems from bp microsystems, hilo systems, and others are available for large-production quantities. cyberclocks ? software cyberclocks is an easy-to-use soft ware applicatio n that allows the user to custom-configure t he cy22050. within cyberclocks, select the cyclocksrt ? tool. users can specify the ref, pll frequency, output frequencies and/or post-dividers, and different functional options. cyclocksrt outputs an industry-standard jedec file used for programming the cy22050. cyclocksrt can be do wnloaded free of charge from the cypress website at http://www.cypress.com . install and run it on any pc running the windows operating system. cy3672 development kit the cypress cy3672 development kit comes complete with everything needed to design with the cy22050 and program samples and small prototype quant ities. the kit comes with the latest version of cyclocksrt and a small portable programmer that connects to a pc for on-the-fly programming of custom frequencies. the jedec file output of cycl ocksrt can be downloaded to the portable programmer for small-vo lume programming, or for use with a production programming system for larger volumes. applications controlling jitter jitter is defined in many ways, including: phase noise, long-term jitter, cycle-to-cycle jitter, peri od jitter, absolute jitter, and deterministic jitter. these jitter terms are usually given in terms of rms, peak-to-peak, or in the case of phase noise dbc/hz with respect to the fundamental freque ncy. actual jitter is dependent on xin jitter and edge rate, num ber of active outputs, output frequencies, v ddl (2.5 v or 3.3 v), temper ature, and output load. power supply noise and clock output loading are two major system sources of clock jitter. power supply noise can be mitigated by proper power supply decoupling (0.1- ? f ceramic cap) of the clock and ensuring a low-impedance ground to the chip. reducing capacitive clock output loading to a minimum lowers current spikes on the clock edges and thus reduces jitter. reducing the total number of active outputs also reduce jitter in a linear fashion. however, it is better to use two outputs to drive two loads than one output to drive two loads. the rate and magnitude that the pll corrects the vco frequency is directly related to jitter perform ance. if the rate is too slow, then long term jitter and phase noise is poor. therefore, to improve long-term jitter and phase noise, reducing q to a minimum is advisable. this technique in creases the speed of the phase frequency detector, which in turn drives the input voltage of the vco. in a similar manner, increasing p until the vco is near its maximum rated speed also decreases long term jitter and phase noise. for example: input refer ence of 12 mhz; desired output frequency of 33.3 mhz. one mi ght arrive at the following solution: set q = 3, p = 25, post div = 3. however, the best jitter results are q = 2, p = 50, post div = 9. for additional information, refer to the application note, ?jitter in pll-based systems: causes, effects, and solutions,? available at http://www.cypress.com (click on ?application notes?), or contact your local cypress field applications engineer. [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 5 of 14 cy22050 frequency calculation the cy22050 is an extremely flexible clock generator with up to six individual outputs, gene rated from an integrated pll. there are four variables used to determine the final output frequency. they are: the input ref, the p and q dividers, and the post divider. the three basic formulas for determining the final output frequency of a cy22150-based design are: clk = ((ref * p)/q)/post divider clk = ref/post divider clk = ref the basic pll block diagram is shown in figure 2 . each of the six clock outputs has a total of seven output options available to it. there are six post divider options: /2 (two of these), /3, /4, /div1n, and div2n. div1n and div2n are separately calculated and can be independent of each other. the post divider options can be applied to the calculated pll frequency or to the ref directly. in addition to the six post divi der options, the seventh option bypasses the pll and passes the re f directly to the crosspoint switch matrix. clock output settings: crosspoint switch matrix each of the six clock outputs ca n come from any of seven unique frequency sources. the crosspoint switch matrix defines which source is attached to each individual clock output. although it may seem that there are an unlimit ed number of divider options, there are several rules that must be taken into account when selecting divider options. figure 2. basic pll block diagram q vco p /2 / 3 / 2 lclk1 lclk2 lclk3 lclk4 clk5 clk6 crosspoint switch ref pfd divider bank 1 / 4 divider bank 2 /div1n /div2n matrix table 1. clock output definition clock output divider definition and notes none clock output source is the reference input frequency. /div1n clock output uses a generated /div1n option from divider bank 1. allowable values for div1n are 4 to 127. if divider bank 1 is not being used, set div1n to 8. /2 clock output uses a fixed /2 option from divider bank 1. if this option is used, div1n must be divisible by 4. /3 clock output uses a fixed /3 option from divider bank 1. if this option is used, set div1n to 6. /div2n clock output uses a generated /div2n option from divider bank 2. allowable values for div2n are 4 to 127. if divider bank 2 is not being used, set div2n to 8. /2 clock output uses a fixed /2 option from divider bank 2. if this option is used, div2n must be divisible by 4. /4 clock output 2 uses a fixed /4 option from divider bank 2. if this option is used, div2n must be divisible by 8. [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 6 of 14 reference crystal input the input crystal oscillator of the cy22050 is an important feature because of the flexibility it allows the user in selecting a crystal as a reference clock source. the oscillator inverter has programmable gain, allowing for maximum compatibility with a reference crystal, based on manufacturer, process, performance, and quality. the value of the input load capacitors is determined by eight bits in a programmable register. total load capacitance is determined by the formula: capload = (c l ? c brd ? c chip )/0.09375 pf in cyclocksrt, enter the crystal capacitance (c l ). the value of capload is determined automatically and programmed into the cy22050. if you require greater control ov er the capload value, consider using the cy22150 for serial configuration and control of the input load capacitors. for an external clock source, the default is 0. input load capacitors are placed on the cy22050 die to reduce external component cost. these capacitors are true parallel-plate capacitors, designed to reduce the frequency shift that occurs when non-linear load capacitance is affected by load, bias, supply, and temperature changes. crystal drive level and power crystals are specified to accept a maximum drive level. generally, larger crystals can ac cept more power. the drive level specification in the table below is a general upper bound for the power driven by the oscillator circuit in the cy22050. for a given voltage swing, power dissipation in the crystal is proportional to esr and proportional to the square of the crystal frequency. (note that actual esr is sometimes much less than the value specified by the crysta l manufacturer.) power is also almost proportional to the square of c l . power can be reduced to less than the dl specification in the table below by selecting a reduced frequency crystal with low c l and low r 1 (esr). absolute maximum conditions parameter description min max unit v dd supply voltage ?0.5 7.0 v v ddl i/o supply voltage ?0.5 7.0 v t s storage temperature [3] ?65 125 c t j junction temperature ? 125 c package power dissipation ?commercial temp ? 450 mw package power dissipation?industrial temp ? 380 mw digital inputs av ss ? 0.3 av dd + 0.3 v digital outputs referred to v dd v ss ? 0.3 v dd + 0.3 v digital outputs referred to v ddl v ss ? 0.3 v ddl +0.3 v esd static discharge voltage per mil-std-833, method 3015 ? 2000 v note 3. rated for 10 years [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 7 of 14 recommended oper ating conditions parameter description min typ max unit v dd operating voltage 3.135 3.3 3.465 v vddl hi operating voltage 3.135 3.3 3.465 v vddl lo operating voltage 2.375 2.5 2.625 v t ac ambient commercial temp 0 ? 70 c t ai ambient industrial temp ?40 ? 85 c c load max. load capacitance v dd /v ddl = 3.3 v ? ? 15 pf c load max. load capacitance v ddl = 2.5 v ? ? 15 pf f refd driven ref 1 ? 133 mhz f refc crystal ref 8 ? 30 mhz t pu power up time for all v dd s to reach minimum specified voltage (power ramps must be monotonic) 0.05 ? 500 ms recommended crystal specifications parameter description comments min typ max unit f nom nominal crystal frequency parallel resonance, fundamental mode 8?30mhz c lnom nominal load capacitance 10 ? 20 pf r 1 equivalent series resistance (esr) fundamental mode ? ? 50 ? dl crystal drive level no external series resistor assumed ? 0.5 2 mw [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 8 of 14 dc electrical characteristics parameter [4] description condition min typ max unit i oh3.3 output high current v oh = v dd ? 0.5 v, v dd /v ddl = 3.3 v 12 24 ? ma i ol3.3 output low current v ol = 0.5 v, v dd /v ddl = 3.3 v 12 24 ? ma i oh2.5 output high current v oh = v ddl ? 0.5 v, v ddl = 2.5 v 8 16 ? ma i ol2.5 output low current v ol = 0.5 v, v ddl = 2.5 v 8 16 ? ma v ih input high voltage cmos levels, 70% of v dd 0.7 ? 1.0 v dd v il input low voltage cmos levels, 30% of v dd 0?0.3v dd i vdd [5, 6] supply current av dd /v dd current ?45?ma i vddl3.3 [5, 6] supply current v ddl current (v ddl = 3.465 v) ? 25 ? ma i vddl2.5 [5, 6] supply current v ddl current (v ddl = 2.625 v) ? 17 ? ma i dds power down current v dd = v ddl = av dd = 3.465 v ? ? 50 ? a i ohz i olz output leakage v dd = v ddl = av dd = 3.465 v ? ? 10 ? a ac electrical characteristics parameter [4] description condition min typ max unit t 1 output frequency, commercial temperature clock output limit, 3.3 v 0.08 (80 khz) ? 200 mhz clock output limit, 2.5 v 0.08 (80 khz) ? 166.6 mhz output frequency, industrial temperature clock output limit, 3.3 v 0.08 (80 khz) ? 166.6 mhz clock output limit, 2.5 v 0.08 (80 khz) ? 150 mhz t 2 output duty cycle duty cycle is defined in figure 4 , t 1 /t 2 , f out > 166 mhz, 50% of v dd 40 50 60 % duty cycle is defined in figure 4 , t 1 /t 2 , f out < 166 mhz, 50% of v dd 45 50 55 % t 3lo rising edge slew rate (v ddl = 2.5 v) output clock rise time, 20%?80% of v ddl , defined in figure 5 0.6 1.2 ? v/ns t 4lo falling edge slew rate (v ddl = 2.5 v) output clock fall time, 80%?20% of v ddl , defined in figure 5 0.6 1.2 ? v/ns t 3hi rising edge slew rate (v ddl = 3.3 v) output clock rise time, 20%?80% of v dd /v ddl , defined in figure 5 0.8 1.4 ? v/ns t 4hi falling edge slew rate (v ddl = 3.3 v) output clock fall time, 80%?20% of v dd /v ddl , defined in figure 5 0.8 1.4 ? v/ns t 5 [7] skew output-output skew between related outputs ??250ps t 6 [8] clock jitter peak-to-peak period jitter (see figure 6 ) ? 250 ? ps t 10 pll lock time ? 0.30 3 ms notes 4. not 100% tested, guaranteed by design. 5. i vdd currents specified for two clk outputs running at 125 mhz, two lc lk outputs running at 80 mhz, and two lclk outputs running at 66.6 mhz. all outputs are loaded with 15 pf. 6. use cyclocksrt to calculate actual i vdd and i vddl for specific output frequency configurations. 7. skew value guaranteed when outputs are generated from the sa me divider bank. see logic block diagram for more information. 8. jitter measurement will vary. actual jitter is dependent on x in jitter and edge rate, number of active outputs, output frequencies, v ddl (2.5 v or 3.3 v), temperature, and output load. for more information, refer to the application note, ?jitter in pll-based systems: causes, effects, and soluti ons,? available at http://www.cypress.com , or contact your local cypress field applications engineer. [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 9 of 14 test circuit figure 3. test circuit 0.1 ?? f v dd 0.1 ? f av dd clk out c load gnd outputs v ddl 0.1 ? f switching waveforms figure 4. duty cycl e definition: dc = t2/t1 figure 5. rise and fall time definitions figure 6. peak-to-peak jitter t1 t2 clk 50% 50% t3 clk 80% 20% t4 clk t6 [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 10 of 14 some product offerings are factory programmed customer sp ecific devices with customized part numbers. the possible configurations table shows the available device types, but not co mplete part numbers. contact your local cypress fae or sales representative for more information. ordering code definitions ordering information ordering code package type temperature operating range operating voltage cy22050kfc 16-pin tssop commercial (0 c to 70 c) 3.3 v CY22050KFI 16-pin tssop industrial (?40 c to 85 c) 3.3 v pb-free cy22050kfzxc 16-pin tssop commercial (0 c to 70 c) 3.3 v cy22050kfzxi 16-pin tssop industrial (?40 c to 85 c) 3.3 v programmer cy3672-usb programming kit cy3695 cy22050f, cy22050kf and cy220501kf adapter for cy3672 programmer possible configurations ordering code package type temperature operating range operating voltage cy22050kzxi-xxx [9] 16-pin tssop industrial (?40 c to 85 c) 3.3 v cy22050kzxi-xxxt 16-pin tssop-tape and reel industrial (?40 c to 85 c) 3.3 v t = tape and reel, blank = tube configuration specific identifier (factory programmed) temperature range: x = c or i c = commercial; i = industrial pb-free package type: z = 16-pin tssop f = field programmable, blank = factory programmed fab identifier: x = k or none lead finish: x = 1 or blank 1 = nipdau; blank = unspecified base part number company id: cy = cypress 22050 cy x x x (-xxx) x f t z note 9. these are factory-programmed configurations. factory programmi ng is available for high-volume design opportunities of 100 ku/ year or more in production. for more details, contact your local cypress field applic ation engineer or cypress sales representative. [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 11 of 14 16-pin tssop package characteristics parameter name value unit ? ja theta ja 115 c/w complexity transistor count 74,600 transistors package drawing and dimensions figure 7. 16-pin tssop 4.40 mm body z16.173/zz16.173, 51-85091 51-85091 *c [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 12 of 14 acronyms document conventions units of measure acronym description esr equivalent series resistance fae field application engineer i/o input/output jedec joint electron devices engineering council oe output enable pc personal computer pcb printed circuit board pll phase-locked loop tssop thin shrunk small outline package vco voltage controlled oscillator symbol unit of measure c degree celsius dbc decibels relative to carrier hz hertz khz kilohertz mhz megahertz a microampere f microfarad ma milliampere mm millimeter ms millisecond mw milliwatt ns nanosecond ? ohm % percent pf picofarad ps picosecond vvolt wwatt [+] feedback
cy22050, cy220501 document #: 38-07006 rev. *k page 13 of 14 document history page document title: cy22050, cy220501, one-pll ge neral-purpose flash-programmable clock generator document number: 38-07006 rev. ecn orig. of change submission date description of change ** 108185 ckn 08/08/01 new data sheet. *a 110054 ckn 03/04/02 changed from preliminary to final. *b 121862 rbi 12/14/02 power up requirements added to operating conditions information. *c 310575 rgl 01/20/05 added lead-free devices. *d 314233 rgl 01/31/05 removed the tape and reel devices in the non-dash parts. *e 2440826 aesa 05/15/08 updated template. added note ?not recommended for new designs.? and ?38-07409, cy3672 ptg programming kit?. corrected ?ftg? to ?ptg? in ordering information table. added pa rt numbers cy22050kfc, CY22050KFI, cy22050kfzxc, cy22050kfzxi, cy22050kzxc-xxx, cy22050kzxc-xxxt, cy22050kzxi-xxx, and cy22050kzxi-xxxt in ordering info rmation table. changed lead-free to pb-free. *f 2642064 kvm 01/21/09 added cy220501 to title. added cy220501kfzxi to ordering table. *g 2743347 kvm 07/24/09 revised the device selection table on page 1 and renamed it. updates to programmer and software descriptions. clarified that i vdd and i vddl are for loaded outputs. updated footnotes to show that the st andard part numbers are now with a ?k?. changed cy3672 part number to cy 3672-usb, changed cy3672adp000 to cy3695, and repositioned them in the ordering information table. deleted part numbers cy220 50zc-xxxt, cy22050zi-xxx and cy22050zi-xxxt. *h 2899683 kvm 03/26/10 removed inactive parts from ordering information table moved xxx parts to ?possibl e configurations? table updated package diagram *i 3167517 bash 02/09/11 add crystal parameter table on page 6, ordering code definition, acronym and units tables. remove references to ftg. deleted table 1 from page 1, device select ion: this table provides no additional information. consolidated its input/output range information as a ?features? bullet. removed ?benefits? section. updated footnote#9 on page 8. *j 3210223 bash 03/30/2011 removed cy220501k fzxi, cy22050kzxc-139 and cy22050kzxc-139t from the data sheet. updated package diagram from *b to *c *k 3366417 puru 09/08/2011 updated in new template. [+] feedback
document #: 38-07006 rev. *k revi sed september 8, 2011 page 14 of 14 bp microsystems is a trademark of bp microsystems. hilo systems is a trademark of hi- lo systems. all products and company names mentioned in this document may be the trademarks of their respective holders. cy22050, cy220501 ? cypress semiconductor corporation, 2001-2011. the information contained herein is subject to change without notice. cypress s emiconductor corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a cypress product. nor does it convey or imply any license under patent or other rights. cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement wi th cypress. furthermore, cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. the inclusion of cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies cypress against all charges. any source code (software and/or firmware) is owned by cypress semiconductor corporation (cypress) and is protected by and subj ect to worldwide patent protection (united states and foreign), united states copyright laws and internatio nal treaty provisions. cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of, and compile the cypress source code and derivative works for the sole purpose of creating custom software and or firmware in su pport of licensee product to be used only in conjunction with a cypress integrated circuit as specified in the applicable agreement. any reproduction, modification, translation, compilation, or repre sentation of this source code except as specified above is prohibited without the express written permission of cypress. disclaimer: cypress makes no warranty of any kind, express or implied, with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. cypress reserves the right to make changes without further notice to t he materials described herein. cypress does not assume any liability arising out of the application or use of any product or circuit described herein. cypress does not authori ze its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. the inclusion of cypress? prod uct in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies cypress against all charges. use may be limited by and subject to the applicable cypress software license agreement. sales, solutions, and legal information worldwide sales and design support cypress maintains a worldwide network of offices, solution center s, manufacturer?s representatives, and distributors. to find t he office closest to you, visit us at cypress locations . products automotive cypress.co m/go/automotive clocks & buffers cypress.com/go/clocks interface cypress. com/go/interface lighting & power control cypress.com/go/powerpsoc cypress.com/go/plc memory cypress.com/go/memory optical & image sensing cypress.com/go/image psoc cypress.com/go/psoc touch sensing cyp ress.com/go/touch usb controllers cypress.com/go/usb wireless/rf cypress.com/go/wireless psoc solutions psoc.cypress.com/solutions psoc 1 | psoc 3 | psoc 5 [+] feedback

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