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| 1/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. high performance regulators for pcs termination regulators for ddr-sdrams BD3538F,bd3538hfn ? description BD3538F/hfn is a termination regulator compatible with je dec ddr-sdram, which functions as a linear power supply incorporating an n-channel mosfet and prov ides a sink/source current capability up to 1a respectively. a built-in high-speed op-amp specially designed offers an excellent transient response. requires 3.3 volts or 5.0 volts as a bias power supply to drive the n-channel mosfet. has an independent reference voltage input pin (vddq) and an independent feedback pin (vtts) to maintain the accuracy in voltage required by jedec, and offers an excellent output voltage accuracy and load regulation. also has a referenc e power supply output pin (vref) for ddr-sdram or a memory controller. when en pin turns to ?low?, vtt output becomes ? hi-z? while vref output is kept unchanged, compatible with ?self refresh? state of ddr-sdram. ? features 1) incorporates a push-pull power supply for termination (vtt) 2) incorporates a reference voltage circuit (vref) 3) incorporates an enabler 4) incorporates an undervoltage lockout (uvlo) 5) employs sop8 package 6) employs hson8 package 7) incorporates a thermal shutdown protector (tsd) 8) operates with input voltage from 2.7 to 5.5 volts 9) compatible with dual channel (ddr-ii) ? use power supply for ddr i / ii / iii - sdram absolute maximum ratings parameter symbol ratings unit BD3538F bd3538hfn input voltage vcc 7 *1*2 7 *1*2 v enable input voltage ven 7 *1*2 7 *1*2 v termination input voltage vtt_in 7 *1*2 7 *1*2 v vddq reference voltage vddq 7 *1*2 7 *1*2 v output current itt 1 1 a power dissipation1 pd1 560 *3 630 *5 mw power dissipation2 pd2 690 *4 1350 *6 mw power dissipation3 pd3 - 1750 *7 mw operating temperature range tstg -40 +105 -40 +105 storage temperature range tjmax -55 +150 -55 +150 maximum junction temperature tjmax +150 +150 *1 should not exceed pd. *2 instantaneous surge voltage, back electromotive force and voltage under less than 10% duty cycle. *3 reduced by 4.48mw for each increase in ta of 1 over 25 (with no heat sink). *4 reduced by 5.52mw for each increase in ta of 1 over 25 (when mounted on a board 70mm 70mm 1.6mm glass-epoxypcb). *5 reduced by 5.04mw/ for each increase in ta R25 (when mounted on a 70mm 70mm 1.6mm glass-epoxy board, 1-layer) on less than 0.2% (percentage occupied by copper foil. *6 reduced by 10.8mw/ for each increase in ta R25 (when mounted on a 70mm 70mm 1.6mm glass-epoxy board, 1-layer) on less than 7.0% (percentage occupied by copper foil. *7 reduced by 14.0mw/ for each increase in ta R25 (when mounted on a 70mm 70mm 1.6mm glass-epoxy board, 1-layer) on less than 65.0% (percentage occupied by copper foil. no.10030eat33
technical note BD3538F,bd3538hfn 2/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. operating conditions (ta=25 ) parameter symbol ratings unit min max input voltage vcc 2.7 5.5 v termination input voltage vtt_in 1.0 5.5 v vddq reference voltage vddq 1.0 2.75 v enable input volta ge ven -0.3 5.5 v no radiation-resistant design is adopted for the present product. electrical characteristics (unless otherwise noted, ta=25 vcc=3.3v ven=3v vddq=1.8v vtt_in=1.8v) parameter symbol limits unit condition min typ max standby current ist - 0.5 1.0 ma ven=0v bias current icc - 2 4 ma ven=3v [enable] high level enable input voltage venhigh 2.3 - 5.5 v low level enable input voltage venlow -0.3 - 0.8 v enable pin input current ien - 7 10 a ven=3v [termination] termination output voltage 1 vtt1 vref-30m vref vref+30m v itt=-1.0a to 1.0a ta = 0 to 105 *6 termination output voltage 2 vtt2 vref-30m vref vref+30m v vcc=5v, vddq=2.5v vtt_in=2.5v itt=-1.0a to 1.0a ta = 0 to 105 *6 source current itt+ 1.0 - - a sink current itt- - - -1.0 a load regulation Svtt - - 50 mv itt=-1.0a to 1.0a line regulation reg.l - 20 40 mv upper side on resistance 1 hron1 - 0.45 0.9 ? lower side on resistance 1 lron1 - 0.45 0.9 ? upper side on resistance 2 hron2 - 0.4 0.8 ? vcc=5v, vddq=2.5v vtt_in=2.5v lower side on resistance 2 lron2 - 0.4 0.8 ? vcc=5v, vddq=2.5v vtt_in=2.5v [reference voltage input] input impedance zvddq 70 100 130 k? output voltage 1 vref1 1/2 vddq -18m 1/2 vddq 1/2 vddq +18m v iref=-5ma to 5ma ta = 0 to 105 *6 output voltage 2 vref2 1/2 vddq -40m 1/2 vddq 1/2 vddq +40m v iref=-10ma to 10ma ta = 0 to 105 *6 output voltage 3 vref3 1/2 vddq -25m 1/2 vddq 1/2 vddq +25m v vcc=5v, vddq=2.5v vtt_in=2.5v iref=-5ma to 5ma ta = 0 to 105 *6 output voltage 4 vref4 1/2 vddq -40m 1/2 vddq 1/2 vddq +40m v vcc=5v, vddq=2.5v vtt_in=2.5v itt=-10ma to 10ma ta = 0 to 105 *6 [uvlo] threshold voltage vuvlo 2.40 2.55 2.70 v vcc : sweep up hysteresis voltage Svuvlo 100 160 220 mv vcc : sweep down *6 design guarantee technical note BD3538F,bd3538hfn 3/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. fig.1 ddr1 (-1a 1a) fig.3 ddr2 (-1a 1a) fig.2 ddr1 (1a -1a) vtt(20mv/div) itt(1a/div) 10sec/div vtt(20mv/div) itt(1a/div) 10sec/div vtt(20mv/div) itt(1a/div) 10sec/div 1.248 1.249 1.250 1.251 1.252 -10 -5 0 5 10 iref(ma) vref(v) fig.4 ddr2 (1a -1a) fig.5 iref-vref (ddr1) fig.6 iref-vref (ddr2) fig.7 itt-vtt (ddr1) fig.8 itt-vtt (ddr2) fi g.9 input sequence 1 fig.10 input sequence 2 fi g.11 input sequence 3 fig.12 start up wave form vtt(20mv/div) itt(1a/div) 10sec/div 0.897 0.898 0.899 0.900 0.901 0.902 -10 -5 0 5 10 iref(ma) vref(v) 1.240 1.245 1.250 1.255 1.260 -2 -1 0 1 2 itt(a) vtt(v) 0.880 0.885 0.890 0.895 0.900 0.905 0.910 0.915 0.920 -2 -1 0 1 2 itt(a) vtt(v) vcc en vddq vtt in vtt vcc en vddq vtt in vtt vcc en vddq vtt in vtt vtt_in vref vtt (1a/div) 1234 itt_in reference data technical note BD3538F,bd3538hfn 4/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. block diagram pin configration pin function pin no. pin name pin function 1 gnd gnd pin 2 en enable input pin 3 vtts detector pin for termination voltage 4 vref reference voltage output pin 5 vddq reference voltage input pin 6 vcc vcc pin 7 vtt_in termination input pin 8 vtt termination output pin bottom fin substraight (conntct to gnd) vcc vcc vddq vddq vtt_in vcc vcc vcc soft uvlo tsd reference block thermal protection enable en gnd vref vtts vddq ? vtt vtt vtt_in uvlo tsd en uvlo tsd en uvlo vcc tsd en uvlo en 1 2 4 3 8 7 5 6 vtt_in vddq gnd en vtts vref vtt vcc 1 2 3 4 5 6 7 8 technical note BD3538F,bd3538hfn 5/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. description of operations ?vcc in BD3538F/hfn, an independent power input pin is provided for an internal circuit operation of the ic. this is used to drive the amplifier circuit of the ic, and its maximum current rati ng is 4 ma. the power supply voltage is 3.3 to 5.5 volts. it is recommended to connect a bypass capacitor of 1 f or so to vcc. ?vddq reference input pin for the output voltage, that may be used to satisfy the jedec requirement for ddr-sdram (vtt = 1/2vddq) by dividing the voltage inside the ic with two 50 k ? voltage-divider resistors for BD3538F/hfn, care must be taken to an input noise to vddq pin because this ic also cuts such noise input into half and provides it with the voltage output divided in half. such noise may be reduced with an rc filter consisting of such resistance and capacitance (220 ? and 2.2 f, for instance) that may not give significant effect to voltage dividing inside the ic. ? vtt_in vtt_in is a power supply input pin for vtt output. voltage in the range between 1.0 and 5.5 volts may be supplied to this vtt_in terminal, but care must be taken to the current limitation due to on-resistance of the ic and the change in allowable loss due to input/output voltage difference. generally, the following voltages are supplied: ? ddr i vtt_in=2.5v ? ddrii vtt_in=1.8v ? ddriii vtt_in=1.5v higher impedance of the voltage input at vtt_in may result in oscillation or degradat ion in ripple rejection, which must be noted. to vtt_in terminal, it is recommended to use a 10 f capacitor characterized with less change in capacitance. but it may depend on the characteristics of the power supply input and the impedance of the pc board wiring, which must be carefully checked before use. ?vref in BD3538F/hfn, a reference voltage output pin independent from vtt output is given to prov ide a reference input for a memory controller and a dram. even if en pin turns to ?low ? level, vref output is kept unchanged, compatible with ?self refresh? state of dram. the maximum current capab ility of vref is 20 ma, and a suitable capacitor is needed to stabilize the output voltage. it is recommended to use a combination of a 1.0 to 2.2 f ce ramic capacitor characterized with less change in capacitance and a 0.5 to 2.2 ? phase compensator resistor, or a 10f ceramic or tantalum capacitor instead. for an application where vref current is low, a ca pacitor of lower capacitance may be used. if vref current is 1 ma or less, it is possible to secure a phase ma rgin with a ceramic capacito r of 1 f more or less. ? vtts an independent pin provided to improve load regulation of vtt output. in case that longer wiring is needed to the load at vtt output, connecting vtts from the load side may improve the load regulation. ?vtt a ddr memory termination output pin. BD3538F/hfn has a si nk/source current capability of 1.0a respectively. the output voltage tracks the voltage divided in half at vddq pin. vtt output is tu rned to off when vcc uvlo or thermal shutdown protector is activated with en pin level turned to ?low?. do not fail to connect a capacitor to vtt output pin for a loop gain phase compensation and a reduction in output vo ltage variation in the event of sudden change in load. insufficient capacitance may cause an oscillation. high esr (equivalent series resistance) of the capacitor may result in increase in output voltage variati on in the event of sudden change in l oad. it is recommended to use a 220 f functional polymer capacitor (os-con, pos-cap, neo- cap), though it depends on am bient temperature and other conditions. a low esr ceramic capacitor may reduce a loop gain phase margin and may cause an oscillation, which may be improved by connecting a resistor in series with the capacitor. ?en with an input of 2.3 volts or higher, the level at en pin turns to ?hig h? to provide vtt output. if the input is lowered to 0. 8 volts or less, the level at en pin turns to ?low? and vtt st atus turns to hi-z. but if vcc and vddq are established, vref output is maintained. technical note BD3538F,bd3538hfn 6/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. evaluation board BD3538F/hfn evaluation board circuit BD3538F/hfn evaluation board application components part no value company parts name u1 - rohm BD3538F/hfn r4 220 rohm mcr032200 j1 0 - - c2 10f murata grm21 series c3 1f murata grm18 series c5 10f murata grm21 series c7 220f sanyo 2r5tpe220mf c9 2.2f murata grm18 series c5 gnd BD3538F/hfn vcc sw1 j2 r4 c9 c3 c7 c2 2 7 5 6 1 8 3 4 u1 vtt_in vcc vtt vref vddq en vtts gnd technical note BD3538F,bd3538hfn 7/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. notes for use 1. absolute maximum ratings for the present product, thoroughgoing quality control is carri ed out, but in the event that applied voltage, working temperature range, and other absolute maximum rating are exceeded, the present product may be destroyed. because it is unable to identify the short mode, open mode, etc., if any special mode is assumed, which exceeds the absolute maximum rating, physical safety measures are requested to be taken, such as fuses, etc. 2. gnd potential bring the gnd terminal potential to the mini mum potential in any op erating condition. 3. thermal design consider allowable loss (pd) under actual working condition and carry out thermal design with sufficient margin provided. 4. terminal-to-terminal short-circuit and erroneous mounting when the present ic is mounted to a printe d circuit board, take utmost care to di rection of ic and displacement. in the event that the ic is mounted erroneously, ic may be destroyed. in the event of short-circuit caused by foreign matter that enters in a clearance between outputs or out put and power-gnd, the ic may be destroyed. 5. operation in strong electromagnetic field the use of the present ic in the strong electromagnetic field may result in malo peration, to which care must be taken. 6. built-in thermal shutdown protection circuit the present ic incorporates a thermal shutdown protection circuit (tsd circuit). the working temperature is 175c (standard value) and has a -15c (standard value) hysteresis width. when the ic chip temperature rises and the tsd circuit operates, the output terminal is brou ght to the off state. t he built-in thermal shutdown protection circuit (tsd circuit) is first and foremost intended for interrupt ic from thermal runaway, and is not intended to protect and warrant the ic. consequently, never attempt to continuously use the ic afte r this circuit is activated or to use the circuit with the activation of the circuit premised. 7. capacitor across output and gnd in the event a large capacitor is connected across output and gnd, when vcc and vin are short-circuited with 0v or gnd for some kind of reasons, current charged in the capacitor flows into the output and may destroy the ic. use a capacitor smaller than 1000 f between output and gnd. 8. inspection by set substrate in the event a capacitor is connected to a pin with low impedanc e at the time of inspection with a set substrate, there is a fear of applying stress to the ic. ther efore, be sure to discharge electricity for every process. as electrostatic measures, provide grounding in the assembly process, and take utmost care in transportati on and storage. furthermore, when the set substrate is connected to a jig in the inspection process, be sure to turn off power supply to connect the jig and be sure to turn off power supply to remove the jig. 9. inputs to ic terminals this device is a monolithic ic with p + isolation between p-substrate and each elem ent as illustrated below. this p-layer and the n-layer of each element form a pn junction which works as: ? a diode if the electric potentials at the terminals satisfy the following relationship; gnd>terminal a>terminal b, or ? a parasitic transistor if the electric potentials at the termin als satisfy the following relationship; terminal b>gnd terminal a. the structure of the ic inevitably forms parasitic elements, the activation of which may cause interference among circuits, and/or malfunctions contributing to breakdow n. it is therefore requested to take care not to use the device in such manner that the voltage lower than g nd (at p-substrate) may be applied to t he input terminal, which may result in activation of parasitic elements. 10. gnd wiring pattern when both a small-signal gnd and high cu rrent gnd are present, single-point grou nding (at the set standard point) is recommended, in order to separate the small-signal an d high current patterns, and to be sure the voltage change stemming from the wiring resistance and high current does not cause any voltage change in the small-signal gnd. in the same way, care must be taken to avoid wiring pattern fluctuations in any connected external component gnd. resistor transistor (npn) n n n p + p + p p substrate gnd parasitic element pin a n n p + p + p p substrate gnd parasitic element pin b c b e n gnd pin a p aras iti c element pin b other adjacent elements e b c gnd p aras i t i c e l ement technical note BD3538F,bd3538hfn 8/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. 11. output capacitor (c1) do not fail to connect a output capacitor to vref output terminal for stabilization of output voltage. the capacitor connected to vref output terminal works as a loop gain phas e compensator. insufficient capacitance may cause an oscillation. it is recommended to use a low temperature coefficient 1-10 f ceramic capacitor, though it depends on ambient temperature and load conditions. it is therefore requested to carefully check under the actual temperature and load conditions to be applied. 12. output capacitor (c4) do not fail to connect a capacitor to vtt output pin for stabiliz ation of output voltage. this output capacitor works as a loop gain phase compensator and an output voltag e variation reducer in t he event of sudden change in load. insufficient capacitance may cause an oscillation. and if the equivalent series resistance (esr) of this capacitor is high, the variation in output voltage increases in the event of sudden change in load. it is recommended to use a 47-220 f functional polymer capacitor, though it depends on ambient temperature and load conditions. using a low esr ceramic capacitor may reduce a loop gain phase margin and cause an oscillation, which may be improved by connecting a resistor in series with the capacitor. it is therefore requested to carefully check under the actual temperature and load conditions to be applied. 13. input capacitors (c2 and c3) these input capacitors are used to reduce the output impedanc e of power supply to be connected to the input terminals (vcc and vtt_in). increase in the power supply output impedance may result in oscillation or degradation in ripple rejecting characteristics. it is recommended to use a low temperature coefficient 1f (for vcc) and 10f (for vtt_in) capacitor, but it depends on the characteri stics of the power supply input, and the capaci tance and impedance of the pc board wiring pattern. it is therefore requested to carefully check under the actual temperature and load conditions to be applied. 14. input terminals (vcc, vddq, vtt_in and en) vcc, vddq, vtt_in and en terminals of this ic are made up independent one another. to vcc terminal, the uvlo function is provided for malfunction protection. irrespective of the input order of the inputs terminals, vtt output is activated to provide the output voltage when uvlo and en voltages reach the threshold voltage while vref output is activated when uvlo voltage reaches t he threshold. if vddq and vtt_in terminals have equal pot ential and common impedance, any change in current at vtt_in terminal may resu lt in variation of vtt_in voltage, which affects vddq terminal and may cause variation in the output voltage. it is therefore required to perform wiring in such manner that vddq and vtt_in terminals may not have common impedance. if impossible, take appropriate corrective measures including suitable cr filter to be inserted between vddq and vtt_in terminals. 15. vtts terminal a terminal used to improve load regulation of vtt output. connection with vtt terminal must be done not to have common impedance with high current line, which may offer better load regulation of vtt output. 16. operating range within the operating range, the operation and function of the circuits are generally guaranteed at an ambient temperature within the range specified. the values specified for electrical characteristics may not be guaranteed, but drastic change may not occur to such characteristics within the operating range. 17. allowable loss pd for the allowable loss, the thermal derating characteristics ar e shown in the exhibit, which should be used as a guide. any uses that exceed the allowable loss may result in degradat ion in the functions inherent to ic including a decrease in current capability due to chip temperature increase. use within the allowable loss. 18. built-in thermal shutdown protection circuit thermal shutdown protection circuit is bu ilt-in to prevent thermal breakdown. tu rns vtt output to off when the thermal shutdown protection circuit activates. this thermal shutdown pr otection circuit is originally intended to protect the ic itsel f. it is therefore requested to conduct a t hermal design not to exceed the temperat ure under which the thermal shutdown protection circuit can work. 19. the use in the strong elec tromagnetic field may sometimes cause malfun ction, to which care must be taken. in the event that load containing a large inductance component is co nnected to the output terminal, and generation of back-emf at the start-up and when output is turned off is assu med, it is requested to in sert a protection diode. 20. in the event that load containing a la rge inductance component is connected to the output terminal, and generation of back-emf at the start-up and when output is turned off is assumed, it is requested to insert a protection diode. 21. we are certain that examples of applied circuit diagrams are recommendable, but you are requested to thoroughly conf irm the characteristics before using the ic.in addition, when the ic is used with the external circuit changed, decide the ic with sufficient margin provided while consideration is being given not only to static characteristics but also variations of external parts and our ic including transient characteristics. output pin (example) technical note BD3538F,bd3538hfn 9/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. 0 100 200 300 400 500 600 700 800 0 25 50 75 100 125 150 ambient temperatureta() power dissipation pd mw) (2) 560mw (1) 690mw 100 0.0 0.5 1.0 1.5 2.0 0 25 50 75 100 125 150 ambient temperatureta() power dissipation pd w) (3) 0.63w (2) 1.35w (1) 1.75w (1) 1 layer (copper foil density : 65 ja=71.4 /w (2) 1 layer (copper foil density : 7 ) ja=92.4 /w (3) 1 layer (copper foil density : 0.2 ) ja=198.4 /w heat loss thermal design must be conducted with the operation under the conditions listed below (which are the guaranteed temperature range requiring considerat ion on appropriate margins etc.): 1. ambient temperature ta: 100c or lower 2. chip junction temperature tj: 150c or lower the chip junction temperature tj can be considered as follows. see page 2/10 for ja. for the package has fin at the bottoms of ic, package power depends on the connected copper foil area. be sure to keep the board surface area or release the heat with setting enough through holes to inside pattern. most of heat loss in BD3538F/hfn occurs at the output n-channel fet. the powe r lost is determined by multiplying the voltage between vin and vo by the output current. as this ic employs the power pkg, the thermal derating characteristics significantly depends on the pc board conditions. when designing, care must be taken to the si ze of a pc board to be used. power dissipation (w) = {input voltage (v tt_in ) ? output voltage (v tt =1/2vddq)}io (ave) if vtt_in = 1.8 volts, vddq=1.8 volts, and io (ave)=0.5 a, for instance, the power dissipation is determined as follows: power dissipation (w) = {1.8 (v) ? 0.9 (v)} 0.5 (a) = 0.4 (w) power dissipation sop8 hson8 (1) 70mm 70mm 1.6mm glass-epoxy pcb j-c=181 /w (2) with no heat sink j-a=222 /w technical note BD3538F,bd3538hfn 10/10 www.rohm.com 2010.05 - rev. a ? 2010 rohm co., ltd. all rights reserved. ordering part number b d 3 5 3 8 h f n - t r part no. part no. package f : sop8 hfn : hson8 packaging and forming specification e2: embossed tape and reel (sop8) tr: embossed tape and reel (hson8) ? order quantity needs to be multiple of the minimum quantity. r1010 a www.rohm.com ? 2010 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospac e machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. |
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