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aat4620 pcmcia current limit interface and capacitor charger data sheet 1 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 general description the aat4620 smartswitch is a current limited p-channel mosfet power switch designed for high-side load- switching applications in pcmcia gsm/gprs/3g modem cards. used in conjunction with a super capacitor, the aat4620 will ensure that the power ratings of the pcmcia host are not exceeded at any time. featuring two inde- pendent, programmable current limits and a power loop, the aat4620 can ensure that the super capacitor can be charged without exceeding pcmcia specifications. the current limit is set by two external resistors allowing a 10% current limit accuracy over the normal operating temperature range. the switch can be controlled from either of the two enable inputs and in the off condition will block currents in both directions. the aat4620 also incorporates a system ready function which can advise the system that the super capacitor is fully charged and ready for use. adjustable hysteresis is provided with the addition of an external resistor. the quiescent supply cur- rent is typically a low 40 a. in shutdown mode, the sup- ply current decreases to less than 1 a. the aat4620 is available in a thermally enhanced, pb-free, 12-pin tsopjw package and is specified over the -40c to 85c temperature range. features v in range: 3.0v to 5.5v dual independent current limits ? 100ma to 1200ma ? 10% current accuracy ? 20c temperature band reverse current blocking protection power loop low quiescent current ? 40 a typical ? 1.0 a max with switch off 65m ? typical r ds(on) at 3v only 1.4v needed for enable control pin system ready output with externally programmable hysteresis under-voltage lockout temperature range: -40c to 85c 12-pin tsopjw package applications cf card port power protection express card gsm/gprs/3g modems hot swap supplies pcmcia card gsm/gprs/3g modems personal communication devices typical application gnd en ilen iu isetu isetl out rdy r setu r setl supercap to load v cc vcc 100k to c r hys under- voltage lockout 1.2v reference current limit control reverse blocking over-temp protection power loop en operation en supercap downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 2 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 pin descriptions pin # symbol function 1 en iu enable input. active low enable with internal pull up. also switches in the higher current limit to allow the system to start functioning. can be directly connected to system ready for automatic enabling. when both en il and en iu are enabled, i setu will be selected. 2 en il enable input. active low enable with internal pull up. also switches in the lower current limit initiating the super capacitor to start charging. 3 gnd device ground connection. 4, 5, 6 vcc input pins to the p-channel mosfet source. connect 1 f capacitor from vcc to gnd. 7, 8 out p-channel mosfet drain connection. connect to super capacitor from out to gnd. 9 isetl lower current-limit set input. a resistor from isetl to ground sets the maximum lower current limit for the switch. current limit can be set between 100ma and 1200ma. 10 isetu upper current limit set input. a resistor from isetu to ground sets the maximum upper current limit for the switch. current limits can be set between 100ma and 1200ma. connect to ground to disable current limit. 11 rhys system ready hysteresis. connect a resistor to ground to set the system ready comparator hysteresis. 12 rdy system ready pin. open drain, active low, initiated when the capacitor is 98% charged. pin configuration tsopjw-12 (top view) 1 2 3 4 5 6 12 11 10 9 8 7 en iu en il gnd vcc vccvcc rdyrhys isetu isetl out out downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 3 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at conditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on an fr4 board. absolute maximum ratings 1 symbol description value units v cc vcc to gnd -0.3 to 6 v v en en to gnd -0.3 to v cc + 0.3 v v set , v out set, out to gnd -0.3 to v cc + 0.3 v i max maximum continuous switch current 2.5 a thermal characteristics symbol description value units ? ja maximum thermal resistance 2 160 c/w p d maximum power dissipation 2 625 mw t j operating junction temperature range -40 to 150 c downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 4 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 1. the aat4620 is guaranteed to meet performance specification over the -40c to 85c operating temperature range and is assure d by design, characterization and correlation with statistical process controls. 2. for v in outside this range consult the typical en threshold curve. electrical characteristics 1 v cc = 3.0v to 5.5v, t a = -40c to 85c unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units v cc operation voltage 3.0 5.5 v i q quiescent current en il or en iu = v cc , i out = 0, r hys = 200k ? 40 75 a i qu0 quiescent current u 0 en il = v cc , en iu = gnd, i out = 0, i set = gnd, r hys = 200k ? i q(off) off supply current en il = en iu = v cc 0.4 1.0 a i sd(off) off switch current en il = en iu = v cc , v supercap = 0 0.4 10 a v uvlo under-voltage lockout rising edge, 1% hysteresis 2.7 3.0 v r ds(on) on-resistance v cc =4.75v, r setl = r setu = 0k 50 100 m ? v cc =3.0v, r setl = r setu = 0k 65 120 i limlacc lower current limit accuracy r setl = 249k ? ; ? t a 20c 180 200 220 ma r setl = 249k ? 170 200 230 i limuacc upper current limit accuracy r setu = 1.24m ? ; ? t a 20c 900 1000 1100 ma r setu = 1.24m ? 850 1000 1150 i lim(min) lower minimum current limit 75 ma v en(l) en input low voltage v cc =3.0v to 5.5v2 0.4 v v en(h) en input high voltage v cc = 3.0v to 5.5v2 1.4 v i en(sink) en input leakage v en = 5.5v 1.0 a t del(off) turn-off delay time v cc = 5v 0.4 1.0 s v rdy system ready trip threshold v out rising, t a = 25c 98 % of v out v rdyhys system ready hysteresis r hys = 200k ? 200 mv v rdy(l) system ready voltage low i sink = 1ma 0.4 v i rdy rdy leakage current v rdy < 5.5v, v out < 98% of v out 1.0 a otmp shutdown temperature 145 c downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 5 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 typical characteristics output current vs. output voltage (r setu = 383k , 25c) output voltage (v) output current (a) 0.00 0.10 0.20 0.30 0.40 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3.3 v in = 5v v in = 3.3v r set vs. i lim (25 c) r set (k ) i lim (a) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 0 200 400 600 800 1000 1200 1400 1600 v in = 5v v in = 3.3v reverse off-switch current vs. temperature (e nub = e nlb = v cc ; v in = 0v) temperature ( c) i rsd(off) (a) 0.01 0.1 1 10 100 -40 -20 0 20 40 60 80 100 120 v out = 5v v out = 3.3v off-switch current vs. temperature (e nub = e nlb = v cc ; v out = 0v) temperature ( c) i sd(off) (a) 0.01 0.1 1 10 100 -40 -20 0 20 40 60 80 100 120 v in = 5v v in = 3.3v off-supply current vs. temperature (e nub = e nlb = v cc ; v out = open) temperature ( c) i q(off) (a) 0.01 0.1 1 10 -40 -20 0 20 40 60 80 100 120 v in = 3.3v v in = 5v downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 6 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 typical characteristics r ds(on) vs. input voltage (r set = 0k ) input voltage (v) r ds(on) (m ) 45 50 55 60 65 70 2.5 3 3.5 4 4.5 5 5.5 r ds(on) vs. temperature (r set = 0 ) temperature ( c) r ds(on) (m ) 30 40 50 60 70 80 90 -40 -20 0 20 40 60 80 100 v in = 3v v in = 5v v rhys vs. r rhys r rhys (k ) v rhys (v) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 0 500 1000 1500 i lim vs. temperature (v in = 4v; v out = 3.85v; enlb = 0v; r set = 249k ) temperature ( c) i lim (ma) 190 195 200 205 210 -50 -25 0 25 50 75 100 i lim vs. temperature (v in = 4v; v out = 3.85v; enub = 0v; r set = 1.24m ) temperature ( c) i lim (ma) 960 980 1000 1020 -50 -25 0 25 50 75 100 quiescent current i ql vs. temperature (e nlb = 0v; e nub = v cc ; v out = open) temperature ( c) i ql (a) 20 25 30 35 40 45 50 -40 -20 0 20 40 60 80 100 12 0 v in = 5v v in = 3.3v downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 7 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 typical characteristics v il vs. input voltage (e nub = open; vary e nlb ; 25c) input voltage (v) v il (v) 0.6 0.7 0.8 0.9 1.0 1.1 2.5 3.5 4.5 5.5 6.5 7. 5 v ih vs. input voltage (e nub = open; vary e nlb ; 25c) input voltage (v) v ih (v) 0.6 0.7 0.8 0.9 1.0 1.1 2.50 3.50 4.50 5.50 6.50 7.50 v il vs. input voltage (e nlb = open; vary e nub ; 25c) input voltage (v) v il (v) 0.6 0.7 0.8 0.9 1.0 1.1 2.5 3.5 4.5 5.5 6.5 7.5 v ih vs. input voltage (e nlb = open; vary e nub ; 25c) input voltage (v) v ih (v) 0.6 0.7 0.8 0.9 1.0 1.1 2.50 3.50 4.50 5.50 6.50 7.50 short circuit with 5 series impedance (v in = 3.3v) time (200ms/div) input voltage (middle) (v) output voltage (bottom) (v) output current (a) 0 2 4 0.0 0.2 0.4 0.6 0.8 1.0 soft short circuit with 5 series impedanc e (v in = 5v) time (200ms/div) input voltage (top) (v) output voltage (middle) (v) output current (a) 0 2 4 6 -0.2 0.0 0.2 0.4 downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 8 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 typical characteristics hard short circuit (v in = 3.3v) time (200ms/div) input voltage (top) (v) output voltage (middle) (v) output current (a) 0 2 4 6 -0.2 0.0 0.2 0.4 hard short circuit (v in = 5v) time (200ms/div) input voltage (top) (v) output voltage (middle) (v) output current (a) 0 2 4 6 -0.2 0.0 0.2 0.4 charging profile (i limit = 150ma; v in = 5v; c o = 0.55f) time (5s/div) output voltage (v) output current (a) 0 2 4 6 -0.15 0.00 0.15 0.30 charging profile (i limit = 150ma; v in = 5v; c o = 0.55f) time (20ms/div) output voltage (v) output current (a) 0 2 -0.05 0.00 0.05 0.10 0.15 charging profile (i limit = 1a; v in = 5v; c o = 0.55f) time (2s/div) output voltage (v) output current (a) 0 2 4 6 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 charging profile (v in = 5v, v isetl = v isetu = 0v, c o = 0.55f) time (2s/div) output voltage (v) output current (a) 0 2 4 6 -0.5 0.0 0.5 1.0 1.5 downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 9 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 functional description the aat4620 is an integrated p-channel mosfet load switch with an upper and lower adjustable current limits which can be enabled independently, over-temperature protection, a power loop and a super capacitor charger. the current limit control is combined with an over tem- perature thermal limit and power loop circuit to provide a comprehensive system to protect the load switch and its supply from load conditions which exceed the supply specifications. the aat4620 has been designed specifi- cally to provide the interface between a pcmcia host and pcmcia card where a super capacitor has been used to average out high pulse currents which would other- wise exceed the pcmcia/ express card power specifica- tions. e.g. gsm/ gprs modem cards, where pulse cur- rents during transmit signals can exceed the 1a maxi- mum specification (1.3a in the case of express card). the current limit and over temperature circuits act inde- pendently. the device current limit is activated when the output load current exceeds an internal threshold level. there are two internal current limits which are enabled independently. the current limit threshold in each case is determined by external resistors connected between the two set pins and ground. the minimum current limit functional block diagram gnd en il en iu isetu vcc out isetl rdy rhys reverse blocking over-temp protection power loop under- voltage lockout 1.2v reference current limit control downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 10 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 r set range i iset ( a) i lim /v iset (a/v) current limit range (a) current limit 1.5meg - 750k 1 0.8 1.2-0.6 r set *1 a*0.8 750k - 375k 2 0.4 0.6-0.3 r set *2 a*0.4 375k - 187.5k 4 0.2 0.3-0.15 r set *4 a*0.2 187.5 - 93.75k 8 0.1 0.15-0.075 r set *8 a*0.1 table 1: r set table. threshold is specified by i lim(min) . if the load condition maintains the device in current limit and the chip tem- perature reaches a critical point, then an internal power loop will reduce the current to a safe level. connecting isetu to ground disables the current limit protection allowing a low impedance path to the host v cc . the load switch is turned off by applying a logic high level to both of the en pins. when both en il and en iu are selected isetu will be selected. the en function has logic level thresholds that allow the aat4620 to be ttl compatible and may also be controlled by 2.5v to 5.0v cmos circuits. the voltage level applied to the en pins should not exceed the input supply level present on the vcc pin. the aat4620 typically consumes 40 a when operating, when off, the device draws less then 1 a. in the off state, current is prevented from flowing between the input and output. under-voltage lockout circuitry ensures that the v cc sup- ply is high enough for correct operation of the ic. also included is a system ready function which will be acti- vated when the capacitor voltage is charged and the load is permitted to take current. for automatic functionality, this pin can be directly connected to the en iu pin. an external resistor is provided to add hysteresis to this function. application informationisetu and isetl current limit set the aat4620 current limit is set at two different levels. resistors from isetl and isetu set the lower and upper current limit levels respectively. the isetl and isetu nodes operate within a window of 0.75v to 1.5v for resistor values ranging from 93.75 ? to 1.5m ? . resistor values outside this range are not recom- mended. the isetl and isetu source current varies with the resistor value used according to table 1. to determine the resulting current limit multiply the r setu or r setl node voltage times the gain in table 1. note that the voltage at the node varies from 0.75v to 1.5v and the current limit gain varies depending on the resistor value used. v iset = r set i iset = 0.75v to 1.5v if the set pin is open circuit or allowed to exceed 2v, all power devices are disabled and the input is disconnected from the output. shorting the set pin to gnd enables all power devices and shorts the v cc to the output pin with no current limit. to activate the upper current level (r setu ) pull en iu low. to activate the lower current level (r setl ) pull en il low. if both en iu and en il are pulled low the en iu current limit level (r setu ) will be selected. downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 11 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 r setu and r setl (m ) i load limit (a) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0.10 0.30 0.50 0.70 0.90 1.10 1.30 1.50 figure 1: calculated current limit r set characteristic. system ready hysteresis (rhys) and system ready (rdy) in internal comparator senses the output voltage and delivers a ready signal to the external micro controller when the output voltage reaches 98% of the final value (v cc ). the comparator hysteresis is programmed by a resistor from the rhys pin to ground. the rhys voltage determines the hysteresis voltage and is equal to the rhys source current (1 a) times the rhys resistance. v hyst = r hys 1a = 200k 1 a = 0.2v the system ready pin (rdy) is an open drain output that switches low when the output voltage reaches 98% of the input voltage. it requires an external pull up resistor tied to the input voltage with a typical value of 100k ? . power loop the aat4620 power loop limits the load current in the event that the device power dissipation becomes exces- sive. the aat4620 power loop regulates the die tempera- ture to 100c, decreasing the load current in increments of 1/32 of the current limit set point when the die tem- perature reaches 100c. when the die temperature exceeds 100c it decreases the load current by 1/32 of the current limit set point. if die temperature is less than 100c, it increases the load current in increments of 1/32 of the current limit set point until the set current limit point is reached or the die temperature exceeds 100c. the delay time between die temperature measurements varies depending on the load current limit set point. the delay ranges from 1ms for a 75ma current limit set point to 8ms for a 1.5a current limit set point. for the condition where there is no current limit set point (shorting r setu or r setl to ground) the soft start incre- ments the current limit is 1/32 steps of 1.2a until the current reaches 1.2a, at which point the power mosfet turns on fully. at this point, the current is limited by the r ds(on) of the power mosfet and other series resistance. the power loop and over-temperature loop then takes control to limit the current until the output voltage has fully charged. over-temperature protection if the die temperature rate of rise is fast enough to exceed the power loop regulated temperature, over- temperature shutdown disables the device. the over- temperature threshold is 145c. after over-temperature shutdown, soft start is initiated once the die temperature drops to 130c. short circuit protection the series pass power mosfet turns off completely after the output has charged to within 18mv of the input volt- age. this protects the device in the event of a short circuit applied to the output. applying a short circuit or heavy load to the output initiates the digital soft start where the current ramps from zero to the final pro- grammed value. the power loop will be activated once the digital soft start begins. under-voltage shutdown under-voltage lockout enables the device at 2.7v typical with 100mv of hysteresis. the maximum uvlo level is 3.0v. downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 12 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 digitally programmed soft start current limit at turn on, the digital soft start increases the load cur- rent in discrete levels equal to 1/32 of the final pro- grammed current limit set point from zero to the final programmed current limit level. reverse current blocking an internal comparator disables the internal pass tran- sistor when the input voltage is less than the output voltage blocking any reverse current from the output to the input. evaluation board the evaluation board schematic is shown in figure 2. the pcb layout is shown in figures 3 and 4. r1 4.7k c110f c2 10f rdy d1 vcc 5 eniu 1 vcc 6 out 8 enil 2 gnd 3 out 7 vcc 4 isetl 9 isetu 10 rhys 11 rdy 12 aat4620 r2200k r3 1.00m r4120k vcc gnd out gnd 1 2 3 eniu j2 1 2 3 enil j1 1 2 j3 1 2 j4 figure 2: aat4620 evaluation board schematic. downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 13 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 figure 3: aat4620 evaluation board pcb top side. figure 4: aat4620 evaluation board pcb bottom side. downloaded from: http:///
aat4620 pcmcia current limit interface and capacitor charger data sheet 14 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201943a skyworks proprietary information products and product information are subject to change without notice. may 15, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (skyworks) products or services. these materials, including the information contained herein, are provided by sky works as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci ? cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for con ? icts, incompatibilities, or other dif ? culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. skyworks assumes no liability for any materials, products or informatio n provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are provided as is without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci ? cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci ? cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci ? cations or parameters. skyworks, the skyworks symbol, and breakthrough simplicity are trademarks or registered trademarks of skyworks solutions, inc., in the united states and other countries. third-party brands and names are for identi ? cation purposes only, and are the property of their respective owners. additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. ordering information package marking 1 part number (tape and reel) 2 tsopjw-12 uzxyy AAT4620ITP-T1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. package information tsopjw-12 0.20 + 0.10 - 0.05 0.055 0.045 0.45 0.1 5 7 nom 4 4 3.00 0.10 2.40 0.10 2.85 0.20 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.15 0.05 0.9625 0.0375 1.00 + 0.10 - 0.065 0.04 ref 0.010 2.75 0.25 all dimensions in millimeters. 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . downloaded from: http:///

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