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  54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 1 post office box 655303 ? dallas, texas 75265  members of the texas instruments widebus  family  inputs are ttl-voltage compatible  independent registers for a and b buses  multiplexed real-time and stored data  flow-through architecture optimizes pcb layout  distributed v cc and gnd pin configuration minimizes high-speed switching noise  epic  (enhanced-performance implanted cmos) 1-  m process  500-ma typical latch-up immunity at 125 c  package options include plastic 300-mil shrink small-outline (dl) packages using 25-mil center-to-center pin spacings and 380-mil fine-pitch ceramic flat (wd) packages using 25-mil center-to-center pin spacings description the 'act16646 are 16-bit bus transceivers consisting of d-type flip-flops and control circuitry with 3-state outputs arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. the devices can be used as two 8-bit transceivers or one 16-bit transceiver. data on the a or b bus is clocked into the registers on the low-to-high transition of the appropriate clock (clkab or clkba) input. figure 1 illustrates the four fundamental bus- management functions that can be performed with the bus transceivers and registers. output-enable (oe ) and direction-control (dir) inputs are provided to control the transceiver functions. in the transceiver mode, data present at the high-impedance port may be stored in either register or in both. the select controls (sab and sba) can multiplex stored and real-time (transparent mode) data. the circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. dir determines which bus receives data when oe is low. in the isolation mode (oe high), a data may be stored in one register and/or b data may be stored in the other register. when an output function is disabled, the input function is still enabled and may be used to store and transmit data. only one of the two buses, a or b, may be driven at a time. the 74act16646 is packaged in ti's shrink small-outline package, which provides twice the functionality of standard small-outline packages in the same printed-circuit-board area. the 54act16646 is characterized for operation over the full military temperature range of 55 c to 125 c. the 74act16646 is characterized for operation from 40 c to 85 c. copyright ? 1996, texas instruments incorporated unless otherwise noted this document contains production data information current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters. please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. epic and widebus are trademarks of texas instruments incorporated. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 1dir 1clkab 1sab gnd 1a1 1a2 v cc 1a3 1a4 1a5 gnd 1a6 1a7 1a8 2a1 2a2 2a3 gnd 2a4 2a5 2a6 v cc 2a7 2a8 gnd 2sab 2clkab 2dir 1oe 1clkba 1sba gnd 1b1 1b2 v cc 1b3 1b4 1b5 gnd 1b6 1b7 1b8 2b1 2b2 2b3 gnd 2b4 2b5 2b6 v cc 2b7 2b8 gnd 2sba 2clkba 2oe 54act16646 . . . wd package 74act16646 . . . dl package (top view)
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 2 post office box 655303 ? dallas, texas 75265 l dir l clkab x clkba x sab x sba l real-time transfer bus b to bus a l dir h clkab x clkba x sab l sba x real-time transfer bus a to bus b x dir x clkab clkba x sab x sba x storage from a, b, or a and b l dir l clkab x clkba h or l sab x sba h transfer stored data to a and/or b x h x x xx x x x l h h or l x h x bus b bus a bus b bus a bus b bus a bus b bus a oe oe oe oe figure 1. bus-management functions
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 3 post office box 655303 ? dallas, texas 75265 function table inputs data i/o 2 operation or function oe dir clkab clkba sab sba a1a8 b1b8 operation or function x x x x x input unspecified store a, b unspecified  x xx x x unspecified input store b, a unspecified  h x x x input input store a and b data h x h or l h or l x x input input isolation, hold storage l l x x x l output input real-time b data to a bus l l x h or l x h output input stored b data to a bus l h x x l x input output real-time a data to b bus l h h or l x h x input output stored a data to bus 2 the data-output functions may be enabled or disabled by various signals at oe or dir. data-input functions are always enabled, i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs.
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 4 post office box 655303 ? dallas, texas 75265 logic symbol 2 1a2 6 1a3 8 1a4 9 1a5 10 1a6 12 1a7 13 1a8 14 2a2 16 2a3 17 2a4 19 2a5 20 2a6 21 2a7 23 2a8 24 5 1a1 1b6 45 1b7 44 1b8 43 1b2 51 1b3 49 1b4 48 1b5 47 1b1 52 4d 1 2 g12 31 2sba 30 2clkba 10 en8 [ba] 28 2dir g10 29 2b6 36 2b7 34 2b8 33 2b2 41 2b3 40 2b4 38 2b5 37 2oe 10 en9 [ab] 1 1 5 5 1 1 7 7 15 2a1 8 9 1 1 12 12 1 1 14 14 13d 2b1 42 11d c11 g14 26 2sab 27 2clkab c13 g5 54 1sba 55 1clkba 3 en1 [ba] 1 1dir g3 56 1oe 3 en2 [ab] c4 g7 3 1sab 2 1clkab c6 6d 2 this symbol is in accordance with ansi/ieee std 91-1984 and iec publication 617-12.
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 5 post office box 655303 ? dallas, texas 75265 logic diagram (positive logic) b8 b7 b6 b5 b4 b3 b2 33 34 36 37 38 40 41 2a8 2a7 2a6 2a5 2a4 2a3 2a2 24 23 21 20 19 17 16 2a1 2sab 2clkab 2sba 2clkba 2dir 2oe 15 26 27 31 30 28 29 tg tg tg tg c1 1d 1d c1 42 b1 seven channels identical to channel one above seven channels identical to channel one above b8 b7 b6 b5 b4 b3 b2 b1 47 48 49 51 52 1a8 1a7 1a6 1a5 1a4 1a3 1a2 14 13 12 10 9 8 6 1a1 5 1sab 1clkab 1sba 1clkba 1dir 1oe 3 2 54 55 1 56 c1 1d 1d c1 tg tg tg tg 45 44 43
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 6 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) 2 supply voltage range, v cc 0.5 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range, v i (see note 1) 0.5 v to v cc + 0.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range, v o (see note 1) 0.5 v to v cc + 0.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input clamp current, i ik (v i < 0 or v i > v cc ) 20 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output clamp current, i ok (v o < 0 or v o > v cc ) 50 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous output current, i o (v o = 0 to v cc ) 50 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous current through v cc or gnd 400 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . maximum package power dissipation at t a = 55 c (in still air) (see note 2): dl package 1.4 w . . . . . . . . . . . storage temperature range, t stg 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated under arecommended operating conditi onso is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. notes: 1. the input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. the maximum package power dissipation is calculated using a junction temperature of 150  c and a board trace length of 750 mils. recommended operating conditions (see note 3) 54act16646 74act16646 unit min max min max unit v cc supply voltage (see note 4) 4.5 5.5 4.5 5.5 v v ih high-level input voltage 2 2 v v il low-level input voltage 0.8 0.8 v v i input voltage 0 v cc 0 v cc v v o output voltage 0 v cc 0 v cc v i oh high-level output current 24 24 ma i ol low-level output current 24 24 ma  t/  v input transition rise or fall rate 0 10 0 10 ns/v t a operating free-air temperature 55 125 40 85 c notes: 3. unused inputs must be held high or low to prevent them from floating. 4. all v cc and gnd pins must be connected to the proper voltage power supply. product preview information concerns products in the formative or design phase of development. characteristic data and other specifications are design goals. texas instruments reserves the right to change or discontinue these products without notice.
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 7 post office box 655303 ? dallas, texas 75265 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions v cc t a = 25 c 54act16646 74act16646 unit parameter test conditions v cc min typ max min max min max unit i oh =50  a 4.5 v 4.4 4.4 4.4 i oh = 50  a 5.5 v 5.4 5.4 5.4 v i oh =24ma 4.5 v 3.94 3.7 3.8 v v oh i oh = 24 ma 5.5 v 4.94 4.7 4.8 v i oh = 50 ma  5.5 v 3.85 i oh = 75 ma  5.5 v 3.85 i ol =50  a 4.5 v 0.1 0.1 0.1 i ol = 50  a 5.5 v 0.1 0.1 0.1 v i ol =24ma 4.5 v 0.36 0.5 0.44 v v ol i ol = 24 ma 5.5 v 0.36 0.5 0.44 v i ol = 50 ma  5.5 v 1.65 i ol = 75 ma  5.5 v 1.65 i i control inputs v i = v cc or gnd 5.5 v 0.1 1 1  a i oz a or b ports  v o = v cc or gnd 5.5 v 0.5 10 5  a i cc v i = v cc or gnd, i o = 0 5.5 v 8 160 80  a  i cc  one input at 3.4 v, other inputs at gnd or v cc 5.5 v 0.9 1 1 ma c i control inputs v i = v cc or gnd 5 v 4 pf c io a or b ports v o = v cc or gnd 5 v 12 pf 2 not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms. 3 for i/o ports, the parameter i oz includes the input leakage current. this is the increase in supply current for each input that is at one of the specified ttl voltage levels rather than 0 v or v cc . timing requirements over recommended ranges of supply voltage and operating free-air temperature, (unless otherwise noted) (see figure 2) t a = 25 c 54act16646 74act16646 unit min max min max min max unit f clock clock frequency 0 90 0 90 0 90 mhz t w pulse duration, clkab or clkba high or low 5.5 5.5 5.5 ns t set p time a before clkab or b before clkba ???? ???? ?? ? ? ? ?? ? ? ? ? ? ? ??? ??k?? ?? ? ? ? ??? ??k?? ???? ??? M M M ?? ? ? ???? ??? ? ????? ??k?? or b before clkba 1.5 1.5 1.5 ns product preview information concerns products in the formative or design phase of development. characteristic data and other specifications are design goals. texas instruments reserves the right to change or discontinue these products without notice.
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 8 post office box 655303 ? dallas, texas 75265 switching characteristics over recommended ranges of supply voltage and operating free-air temperature, (unless otherwise noted) (see figure 2) parameter from to t a = 25 c 54act16646 74act16646 unit parameter (input) (output) min typ max min max min max unit f max 90 90 90 mhz t plh aorb bora 3.9 7.5 9.4 3.9 11.5 3.9 10.6 ns t phl a or b b or a 3.4 7.6 10.6 3.4 12.2 3.4 11.4 ns t pzh oe aorb 3.2 7.7 10.8 3.2 12.9 3.2 11.9 ns t pzl oe a or b 4.2 9 12.2 4.2 14.6 4.2 13.5 ns t phz oe aorb 5.3 7.7 9.6 5.3 10.4 5.3 10.2 ns t plzl oe a or b 4.9 7.3 9.2 4.9 10.3 4.9 9.9 ns t plh clkba or clkab aorb 4.9 8.9 11.1 4.9 13.1 4.9 12.2 ns t phl clkba or clkab a or b 5.1 9 11 5.1 13.1 5.1 12.3 ns t plh sab or sba  aorb 5.2 10.3 13.8 5.2 17.2 5.2 15.6 ns t phl sab or sba (with a or b high) a or b 4.9 8.2 10.6 4.9 12.5 4.9 11.7 ns t plh sba or sab  aorb 4.3 7.8 9.9 4.3 12.1 4.3 11.1 ns t phl sba or sab (with a or b high) a or b 5.9 11.2 14.9 5.9 18.2 5.9 16.7 ns t pzh dir aorb 4.5 9.5 13.6 4.5 16.2 4.5 15.2 ns t pzl dir a or b 4.3 9.2 11.8 4.3 14.2 4.3 13.1 ns t phz dir aorb 4.5 7.9 10.2 4.5 11.2 4.5 10.8 ns t plz dir a or b 4.4 7.5 9.8 4.4 10.8 4.4 10.4 ns 2 these parameters are measured with the internal output state of the storage register opposite to that of the bus input. operating characteristics, v cc = 5 v, t a = 25 c parameter test conditions typ unit c d power dissi p ation ca p acitance p er transceiver outputs enabled c l =50 p f f=1mhz 58 p f c pd po w er dissipation capacitance per transcei v er outputs disabled c l = 50 pf , f = 1 mh z 13 pf product preview information concerns products in the formative or design phase of development. characteristic data and other specifications are design goals. texas instruments reserves the right to change or discontinue these products without notice.
54act16646, 74act16646 16-bit bus transceivers and registers with 3-state outputs scas127b march 1990 revised april 1996 9 post office box 655303 ? dallas, texas 75265 parameter measurement information 50% v cc 1.5 v 1.5 v 1.5 v 3 v 3 v 0 v 0 v t h t su voltage waveforms data input t plh t phl t phl t plh v oh v oh v ol v ol 1.5 v 1.5 v 3 v 0 v 50% v cc 50% v cc input out-of-phase output in-phase output timing input 50% v cc voltage waveforms from output under test c l = 50 pf (see note a) load circuit s1 2 v cc 500 w 500 w output control (low-level enabling) output waveform 1 s1 at 2 v cc (see note b) output waveform 2 s1 at gnd (see note b) v ol v oh t pzl t pzh t plz t phz 1.5 v 1.5 v  v cc 0 v 50% v cc 20% v cc 50% v cc 80% v cc  0 v 3 v gnd open voltage waveforms t plh /t phl t plz /t pzl t phz /t pzh open 2 v cc gnd test s1 3 v 0 v 1.5 v 1.5 v t w voltage waveforms input notes: a. c l includes probe and jig capacitance. b. waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. c. all input pulses are supplied by generators having the following characteristics: prr 1 mhz, z o = 50 w , t r = 3 ns, t f = 3 ns. d. the outputs are measured one at a time with one input transition per measurement. figure 2. load circuit and voltage waveforms
packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) 74act16646dl active ssop dl 56 20 green (rohs & no sb/br) cu nipdau level-1-260c-unlim 74act16646dlg4 active ssop dl 56 20 green (rohs & no sb/br) cu nipdau level-1-260c-unlim 74act16646dlr active ssop dl 56 1000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim 74act16646dlrg4 active ssop dl 56 1000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis. package option addendum www.ti.com 18-jul-2006 addendum-page 1
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant 74act16646dlr ssop dl 56 1000 330.0 32.4 11.35 18.67 3.1 16.0 32.0 q1 package materials information www.ti.com 11-mar-2008 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) 74act16646dlr ssop dl 56 1000 346.0 346.0 49.0 package materials information www.ti.com 11-mar-2008 pack materials-page 2
mechanical data msso001c ? january 1995 ? revised december 2001 post office box 655303 ? dallas, texas 75265 dl (r-pdso-g**) plastic small-outline package 4040048 / e 12/01 48 pins shown 56 0.730 (18,54) 0.720 (18,29) 48 28 0.370 (9,40) (9,65) 0.380 gage plane dim 0.420 (10,67) 0.395 (10,03) a min a max 0.010 (0,25) pins ** 0.630 (16,00) (15,75) 0.620 0.010 (0,25) seating plane 0.020 (0,51) 0.040 (1,02) 25 24 0.008 (0,203) 0.0135 (0,343) 48 1 0.008 (0,20) min a 0.110 (2,79) max 0.299 (7,59) 0.291 (7,39) 0.004 (0,10) m 0.005 (0,13) 0.025 (0,635) 0 ?  8 0.005 (0,13) notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. body dimensions do not include mold flash or protrusion not to exceed 0.006 (0,15). d. falls within jedec mo-118
important notice texas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. all products are sold subject to ti?s terms and conditions of sale supplied at the time of order acknowledgment. ti warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with ti?s standard warranty. testing and other quality control techniques are used to the extent ti deems necessary to support this warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. ti assumes no liability for applications assistance or customer product design. customers are responsible for their products and applications using ti components. to minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. ti does not warrant or represent that any license, either express or implied, is granted under any ti patent right, copyright, mask work right, or other ti intellectual property right relating to any combination, machine, or process in which ti products or services are used. information published by ti regarding third-party products or services does not constitute a license from ti to use such products or services or a warranty or endorsement thereof. use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from ti under the patents or other intellectual property of ti. reproduction of ti information in ti data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. reproduction of this information with alteration is an unfair and deceptive business practice. ti is not responsible or liable for such altered documentation. information of third parties may be subject to additional restrictions. resale of ti products or services with statements different from or beyond the parameters stated by ti for that product or service voids all express and any implied warranties for the associated ti product or service and is an unfair and deceptive business practice. ti is not responsible or liable for any such statements. ti products are not authorized for use in safety-critical applications (such as life support) where a failure of the ti product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of ti products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by ti. further, buyers must fully indemnify ti and its representatives against any damages arising out of the use of ti products in such safety-critical applications. ti products are neither designed nor intended for use in military/aerospace applications or environments unless the ti products are specifically designated by ti as military-grade or "enhanced plastic." only products designated by ti as military-grade meet military specifications. buyers acknowledge and agree that any such use of ti products which ti has not designated as military-grade is solely at the buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. ti products are neither designed nor intended for use in automotive applications or environments unless the specific ti products are designated by ti as compliant with iso/ts 16949 requirements. buyers acknowledge and agree that, if they use any non-designated products in automotive applications, ti will not be responsible for any failure to meet such requirements. following are urls where you can obtain information on other texas instruments products and application solutions: products applications amplifiers amplifier.ti.com audio www.ti.com/audio data converters dataconverter.ti.com automotive www.ti.com/automotive dsp dsp.ti.com broadband www.ti.com/broadband clocks and timers www.ti.com/clocks digital control www.ti.com/digitalcontrol interface interface.ti.com medical www.ti.com/medical logic logic.ti.com military www.ti.com/military power mgmt power.ti.com optical networking www.ti.com/opticalnetwork microcontrollers microcontroller.ti.com security www.ti.com/security rfid www.ti-rfid.com telephony www.ti.com/telephony rf/if and zigbee? solutions www.ti.com/lprf video & imaging www.ti.com/video wireless www.ti.com/wireless mailing address: texas instruments, post office box 655303, dallas, texas 75265 copyright ? 2008, texas instruments incorporated


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