? semiconductor components industries, llc, 2011 may, 2011 ? rev. 6 1 publication order number: mc74vhc245/d mc74vhc245 octal bus buffer/line driver the mc74vhc245 is an advanced high speed cmos octal bus transceiver fabricated with silicon gate cmos technology. it achieves high speed operation similar to equivalent bipolar schottky ttl while maintaining cmos low power dissipation. it is intended for two ? way asynchronous communication between data buses. the direction of data transmission is determined by the level of the dir input. the output enable pin (oe ) can be used to disable the device, so that the buses are effectively isolated. all inputs are equipped with protection circuits against static discharge. ? high speed: t pd = 4.0 ns (typ) at v cc = 5 v ? low power dissipation: i cc = 4 a (max) at t a = 25 c ? high noise immunity: v nih = v nil = 28% v cc ? power down protection provided on inputs ? balanced propagation delays ? designed for 2 v to 5.5 v operating range ? low noise: v olp = 1.2 v (max) ? pin and function compatible with other standard logic families ? latchup performance exceeds 300 ma ? esd performance: hbm > 2000 v; machine model > 200 v ? chip complexity: 308 fets or 77 equivalent gates ? these devices are pb ? free and are rohs compliant application notes ? do not force a signal on an i/o pin when it is an active output, damage may occur. ? all floating (high impedance) input or i/o pins must be fixed by means of pull up or pull down resistors or bus terminator ics. ? a parasitic diode is formed between the bus and v cc terminals. therefore, the vhc245 cannot be used to interface 5 v to 3 v systems directly. http://onsemi.com device package shipping ? ordering information MC74VHC245DWG soic ? 20 38 units/rail mc74vhc245dtg tssop ? 20 75 units/rail 1 20 marking diagrams soic ? 20 dw suffix case 751d vhc245 awlyywwg tssop ? 20 dt suffix case 948e 1 1 20 1 20 20 vhc245 = specific device code a = assembly location wl, l = wafer lot y = year ww, w = work week g or = pb ? free package (note: microdot may be in either location) vhc 245 alyw mc74vhc245dwr2g soic ? 20 1000 units/reel mc74vhc245dtr2g tssop ? 20 2500 units/t&r ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specification brochure, brd8011/d.
mc74vhc245 http://onsemi.com 2 figure 1. logic diagram a data port a8 a7 a6 a5 a3 a4 a2 a1 9 8 7 6 5 4 3 2 dir oe 1 19 18 17 16 15 14 13 12 11 b1 b2 b3 b4 b5 b6 b7 b8 b data port figure 2. pin assignment a5 a3 a2 a1 dir gnd a8 a7 a6 a4 5 4 3 2 1 10 9 8 7 6 14 15 16 17 18 19 20 11 12 13 b3 b2 b1 oe v cc b8 b7 b6 b5 b4 function table control inputs operation oe dir l l data transmitted from bus b to bus a l h data transmitted from bus a to bus b h x buses isolated (high ? impedance state)
mc74vhc245 http://onsemi.com 3 ??????????????????????? ??????????????????????? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? v cc ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ? 20 ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? 20 ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? 25 ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? 75 ??? ??? ???? ???? ???? ?????????????? ?????????????? ?????????????? ????? ????? ????? ??? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? c * absolute maximum continuous ratings are those values beyond which damage to the device may occur. exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. functional operation under absolute ? maximum ? rated conditions is not implied. ?derating ? soic packages: ? 7 mw/ c from 65 to 125 c tssop package: ? 6.1 mw/ c from 65 to 125 c recommended operating conditions ???? ???? ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? v cc ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? ??????????????? ??????????????? ??? ??? ? 40 ?? ?? ??? ??? c ???? ???? ???? ??????????????? ??????????????? ??????????????? 0.3v v cc =5.0v 0.5v ??? ??? ??? ?? ?? ?? ??? ??? ??? ????????????????????????????????? dc electrical characteristics ???? ???? ???? ??????? ??????? ??????? ??????? ??????? ??????? ??? ??? ??? ????????? ????????? c ??????? ??????? ? 40 to 85 c ?? ?? ?? ???? ???? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? v ih ??????? ??????? ??????? ??????? ? level input voltage ??????? ??????? ??????? ??????? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ?? ?? ?? ?? ???? ???? ???? ??????? ??????? ??????? ? level input voltage ??????? ??????? ??????? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ?? ?? ?? ???? ???? ???? ???? ???? ???? ??????? ??????? ??????? ??????? ??????? ??????? ? level output voltage ??????? ??????? ??????? ? 50 a ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ?? ?? ?? ?? ?? ?? ??????? ??????? ??????? ??????? ? 4ma i oh = ? 8ma ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ??????? ??????? ??????? ??????? ??????? ? level output voltage ??????? ??????? ??????? a ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ?? ?? ?? ?? ?? ??????? ??????? ??????? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ??????? ??????? ??????? ??????? ??????? ??????? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? 0.1 ???? ???? ???? ???? ???? ???? 1.0 ?? ?? ?? a this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high ? impedance cir- cuit. for proper operation, v in and v out should be constrained to the range gnd (v in or v out ) v cc . unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or v cc ). unused outputs must be left open.
mc74vhc245 http://onsemi.com 4 ????????????????????????????????? ????????????????????????????????? ?? ?? ??????? ??????? ? 40 to 85 c ????????? ????????? c ??? ??? ??????? ??????? ??????? ??????? ???? ???? ?? ?? ???? ???? ???? ???? ???? ???? ??? ??? ???? ???? ??? ??? ??????? ??????? ??????? ??????? ???? ???? ???? ???? ???? i oz ??????? ??????? ??????? ? state leakage current ??????? ??????? ??????? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? 0.25 ???? ???? ???? ???? ???? ???? 2.5 ?? ?? ?? a ???? ???? ???? ??????? ??????? ??????? ??????? ??????? ??????? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ?? ?? ?? a ????????????????????????????????? ac electrical characteristics (input t r = t f = 3.0ns) ???? ???? ???? symbol ????????? ????????? ????????? ???????? ???????? ???????? ????????? ????????? c ?????? ?????? ? 40 to 85 c ?? ?? ?? ???? ???? ??? ??? ???? ???? ??? ??? ???? ???? ???? ???? ???? ???? ???? t plh , t phl ????????? ????????? ????????? ????????? ????????? ???????? ???????? ???????? 0.3v c l = 15pf c l = 50pf ???? ???? ???? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ?? ?? ?? ?? ?? ???????? ???????? ???????? 0.5v c l = 15pf c l = 50pf ???? ???? ???? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ????????? ????????? ????????? ????????? ???????? ???????? ???????? 0.3v c l = 15pf r l = 1 k c l = 50pf ???? ???? ???? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ?? ?? ?? ?? ???????? ???????? 0.5v c l = 15pf r l = 1 k c l = 50pf ???? ???? ??? ??? ???? ???? ??? ??? ???? ???? ???? ???? ???? ???? ???? ????????? ????????? ????????? ????????? ????????? ???????? ???????? ???????? 0.3v c l = 50pf r l = 1 k ???? ???? ???? ??? ??? ??? 11.5 ???? ???? ???? ??? ??? ??? ???? ???? ???? ?? ?? ?? ?? ?? ???????? ???????? ???????? 0.5v c l = 50pf r l = 1 k ???? ???? ???? ??? ??? ??? 7.0 ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ????????? ????????? ????????? ????????? ???????? ???????? 0.3v c l = 50pf (note 1) ???? ???? ??? ??? ???? ???? ??? ??? ???? ???? ?? ?? ???????? ???????? ???????? 0.5v c l = 50pf (note 1) ???? ???? ???? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ?? ?? ?? ???? ???? ???? ????????? ????????? ????????? ???????? ???????? ???????? ???? ???? ???? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ?? ?? ?? ???? ???? ????????? ????????? ? state i/o capacitance ???????? ???????? ???? ???? ??? ??? ???? ???? ??? ??? ???? ???? ?? ?? typical @ 25 c, v cc = 5.0v pf 21 1. parameter guaranteed by design. t oslh = |t plhm ? t plhn |, t oshl = |t phlm ? t phln |. 2. c pd is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption with out load. average operating current can be obtained by the equation: i cc(opr ) = c pd v cc f in + i cc / 8 (per bit). c pd is used to determine the no ? load dynamic power consumption; p d = c pd v cc 2 f in + i cc v cc . noise characteristics (input t r = t f = 3.0ns, c l = 50pf, v cc = 5.0v) symbol parameter t a = 25 c unit typ max v olp quiet output maximum dynamic v ol 0.9 1.2 v v olv quiet output minimum dynamic v ol ? 0.9 ? 1.2 v v ihd minimum high level dynamic input voltage 3.5 v v ild maximum low level dynamic input voltage 1.5 v
mc74vhc245 http://onsemi.com 5 switching waveforms v cc gnd a or b b or a 50% 50% v cc t plh t phl figure 3. oe a or b a or b 50% v cc 50% v cc 50% v cc t pzl t plz t pzh t phz v cc gnd high impedance v ol +0.3v v oh -0.3v high impedance v cc gnd 50% figure 4. dir 50% v cc test circuits *includes all probe and jig capacitance c l * test point device under test output figure 5. *includes all probe and jig capacitance c l * test point device under test output figure 6. connect to v cc when testing t plz and t pzl . connect to gnd when testing t phz and t pzh . 1 k
mc74vhc245 http://onsemi.com 6 figure 7. expanded logic diagram oe dir a1 a2 a3 a4 a5 a6 a7 a8 2 3 4 5 6 7 8 9 19 1 b1 b2 b3 b4 b5 b6 b7 b8 18 17 16 15 14 13 12 11 figure 8. input equivalent circuit input figure 9. bus terminal equivalent circuit dir, oe i/o a, b
mc74vhc245 http://onsemi.com 7 package dimensions 20 1 11 10 b 20x h 10x c l 18x a1 a seating plane h x 45 e d m 0.25 m b m 0.25 s a s b t e t b a dim min max millimeters a 2.35 2.65 a1 0.10 0.25 b 0.35 0.49 c 0.23 0.32 d 12.65 12.95 e 7.40 7.60 e 1.27 bsc h 10.05 10.55 h 0.25 0.75 l 0.50 0.90 0 7 notes: 1. dimensions are in millimeters. 2. interpret dimensions and tolerances per asme y14.5m, 1994. 3. dimensions d and e do not include mold protrusion. 4. maximum mold protrusion 0.15 per side. 5. dimension b does not include dambar protrusion. allowable protrusion shall be 0.13 total in excess of b dimension at maximum material condition. soic ? 20 case 751d ? 05 issue g
mc74vhc245 http://onsemi.com 8 package dimensions tssop ? 20 case 948e ? 02 issue c dim a min max min max inches 6.60 0.260 millimeters b 4.30 4.50 0.169 0.177 c 1.20 0.047 d 0.05 0.15 0.002 0.006 f 0.50 0.75 0.020 0.030 g 0.65 bsc 0.026 bsc h 0.27 0.37 0.011 0.015 j 0.09 0.20 0.004 0.008 j1 0.09 0.16 0.004 0.006 k 0.19 0.30 0.007 0.012 k1 0.19 0.25 0.007 0.010 l 6.40 bsc 0.252 bsc m 0 8 0 8 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a does not include mold flash, protrusions or gate burrs. mold flash or gate burrs shall not exceed 0.15 (0.006) per side. 4. dimension b does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 (0.010) per side. 5. dimension k does not include dambar protrusion. allowable dambar protrusion shall be 0.08 (0.003) total in excess of the k dimension at maximum material condition. 6. terminal numbers are shown for reference only. 7. dimension a and b are to be determined at datum plane ? w ? . 110 11 20 pin 1 ident a b ? t ? 0.100 (0.004) c d g h section n ? n k k1 jj1 n n m f ? w ? seating plane ? v ? ? u ? s u m 0.10 (0.004) v s t 20x ref k l l/2 2x s u 0.15 (0.006) t detail e 0.25 (0.010) detail e 6.40 0.252 --- --- s u 0.15 (0.006) t 7.06 16x 0.36 16x 1.26 0.65 dimensions: millimeters 1 pitch soldering footprint on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 mc74vhc245/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
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