octal bus buffer/line driver inverting with 3-state outputs the mc74vhc240 is an advanced high speed cmos octal bus buffer fabricated with silicon gate cmos technology. it achieves high speed operation similar to equivalent bipolar schottky ttl while maintaining cmos low power dissipation. the mc74vhc240 is an inverting 3state buffer, and has two activelow output enables. this device is designed to drive bus lines or buffer memory address registers. the internal circuit is composed of three stages, including a buffer output which provides high noise immunity and stable output. the inputs tolerate voltages up to 7v, allowing the interface of 5v systems to 3v systems. ? high speed: t pd = 3.6ns (typ) at v cc = 5v ? low power dissipation: i cc = 4 m 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 2v to 5.5v operating range ? low noise: v olp = 0.9v (max) ? pin and function compatible with other standard logic families ? latchup performance exceeds 300ma ? esd performance: hbm > 2000v; machine model > 200v ? chip complexity: 120 fets or 30 equivalent gates figure 1. logic diagram data inputs a1 a2 a3 a4 b1 b2 b3 b4 17 15 13 11 8 6 4 218 16 14 12 9 7 5 3 yb4 yb3 yb2 yb1 ya4 ya3 ya2 ya1 inverting outputs output enables oea oeb 1 19 on semiconductor ? semiconductor components industries, llc, 2001 march, 2001 rev. 3 149 publication order number: mc74vhc240/d mc74vhc240 dw suffix 20lead soic wide package case 751d05 ordering information mc74vhcxxxdw mc74vhcxxxdt mc74vhcxxxm soic wide tssop soic eiaj dt suffix 20lead tssop package case 948e02 m suffix 20lead soic eiaj package case 96701 oea , oeb a, b ya , yb l l h l h x h l z inputs outputs function table a3 a2 yb4 a1 oea gnd yb1 a4 yb2 yb3 5 4 3 2 1 10 9 8 7 6 14 15 16 17 18 19 20 11 12 13 ya2 b4 ya1 oeb v cc b1 ya4 b2 ya3 b3 pin assignment
mc74vhc240 http://onsemi.com 150 ??????????????????????? ??????????????????????? maximum ratings* ???? ???? symbol ?????????????? ?????????????? parameter ????? ????? value ??? ??? unit ???? ???? v cc ?????????????? ?????????????? dc supply voltage ????? ????? 0.5 to + 7.0 ??? ??? v ???? ???? v in ?????????????? ?????????????? dc input voltage ????? ????? 0.5 to + 7.0 ??? ??? v ???? ???? v out ?????????????? ?????????????? dc output voltage ????? ????? 0.5 to v cc + 0.5 ??? ??? v ???? ???? i ik ?????????????? ?????????????? input diode current ????? ????? 20 ??? ??? ma ???? ???? i ok ?????????????? ?????????????? output diode current ????? ????? 20 ??? ??? ma ???? ???? i out ?????????????? ?????????????? dc output current, per pin ????? ????? 25 ??? ??? ma ???? ???? i cc ?????????????? ?????????????? dc supply current, v cc and gnd pins ????? ????? 75 ??? ??? ma ???? ? ?? ? ???? p d ?????????????? ? ???????????? ? ?????????????? power dissipation in still air, soic packages2 tssop package2 ????? ? ??? ? ????? 500 450 ??? ? ? ? ??? mw ???? ???? t stg ?????????????? ?????????????? storage temperature ????? ????? 65 to + 150 ??? ??? 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 absolutemaximumrated conditions is not implied. 2derating e soic packages: 7 mw/ c from 65 to 125 c tssop package: 6.1 mw/ c from 65 to 125 c recommended operating conditions ???? ???? symbol ??????????????? ??????????????? parameter ??? ??? min ?? ?? max ??? ??? unit ???? ???? v cc ??????????????? ??????????????? dc supply voltage ??? ??? 2.0 ?? ?? 5.5 ??? ??? v ???? ???? v in ??????????????? ??????????????? dc input voltage ??? ??? 0 ?? ?? 5.5 ??? ??? v ???? ???? v out ??????????????? ??????????????? dc output voltage ??? ??? 0 ?? ?? v cc ??? ??? v ???? ???? t a ??????????????? ??????????????? operating temperature, all package types ??? ??? 40 ?? ?? + 85 ??? ??? c ???? ? ?? ? ???? t r , t f ??????????????? ? ????????????? ? ??????????????? input rise and fall time v cc = 3.3v 0.3v v cc =5.0v 0.5v ??? ? ? ? ??? 0 0 ?? ?? ?? 100 20 ??? ? ? ? ??? ns/v ????????????????????????????????? ????????????????????????????????? dc electrical characteristics ???? ???? ??????? ??????? ??????? ??????? ??? ??? v cc ????????? ????????? t a = 25 c ??????? ??????? t a = 40 to 85 c ?? ?? ???? ???? symbol ??????? ??????? parameter ??????? ??????? test conditions ??? ??? v cc v ???? ???? min ??? ??? typ ???? ???? max ???? ???? min ???? ???? max ?? ?? unit ???? ? ?? ? ???? v ih ??????? ? ????? ? ??????? minimum highlevel input voltage ??????? ? ????? ? ??????? ??? ? ? ? ??? 2.0 3.0 to 5.5 ???? ? ?? ? ???? 1.50 v cc x 0.7 ??? ? ? ? ??? ???? ? ?? ? ???? ???? ? ?? ? ???? 1.50 v cc x 0.7 ???? ? ?? ? ???? ?? ?? ?? v ???? ? ?? ? ???? v il ??????? ? ????? ? ??????? maximum lowlevel input voltage ??????? ? ????? ? ??????? ??? ? ? ? ??? 2.0 3.0 to 5.5 ???? ? ?? ? ???? ??? ? ? ? ??? ???? ? ?? ? ???? 0.50 v cc x 0.3 ???? ? ?? ? ???? ???? ? ?? ? ???? 0.50 v cc x 0.3 ?? ?? ?? v ???? ? ?? ? ???? v oh ??????? ? ????? ? ??????? minimum highlevel output voltage ??????? ? ????? ? ??????? v in = v ih or v il i oh = 50 m a ??? ? ? ? ??? 2.0 3.0 4.5 ???? ? ?? ? ???? 1.9 2.9 4.4 ??? ? ? ? ??? 2.0 3.0 4.5 ???? ? ?? ? ???? ???? ? ?? ? ???? 1.9 2.9 4.4 ???? ? ?? ? ???? ?? ?? ?? v ???? ? ?? ? ? ?? ? ???? ??????? ? ????? ? ? ????? ? ??????? ??????? ? ????? ? ? ????? ? ??????? v in = v ih or v il i oh = 4ma i oh = 8ma ??? ? ? ? ? ? ? ??? 3.0 4.5 ???? ? ?? ? ? ?? ? ???? 2.58 3.94 ??? ? ? ? ? ? ? ??? ???? ? ?? ? ? ?? ? ???? ???? ? ?? ? ? ?? ? ???? 2.48 3.80 ???? ? ?? ? ? ?? ? ???? ?? ?? ?? ?? ???? ? ?? ? ???? v ol ??????? ? ????? ? ??????? maximum lowlevel output voltage ??????? ? ????? ? ??????? v in = v ih or v il i ol = 50 m a ??? ? ? ? ??? 2.0 3.0 4.5 ???? ? ?? ? ???? ??? ? ? ? ??? 0.0 0.0 0.0 ???? ? ?? ? ???? 0.1 0.1 0.1 ???? ? ?? ? ???? ???? ? ?? ? ???? 0.1 0.1 0.1 ?? ?? ?? v ???? ? ?? ? ???? ??????? ? ????? ? ??????? ??????? ? ????? ? ??????? v in = v ih or v il i ol = 4ma i ol = 8ma ??? ? ? ? ??? 3.0 4.5 ???? ? ?? ? ???? ??? ? ? ? ??? ???? ? ?? ? ???? 0.36 0.36 ???? ? ?? ? ???? ???? ? ?? ? ???? 0.44 0.44 ?? ?? ?? ???? ? ?? ? ???? i in ??????? ? ????? ? ??????? maximum input leakage current ??????? ? ????? ? ??????? v in = 5.5v or gnd ??? ? ? ? ??? 0 to 5.5 ???? ? ?? ? ???? ??? ? ? ? ??? ???? ? ?? ? ???? 0.1 ???? ? ?? ? ???? ???? ? ?? ? ???? 1.0 ?? ?? ?? m 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 highimpedance 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.
mc74vhc240 http://onsemi.com 151 ????????????????????????????????? ????????????????????????????????? dc electrical characteristics ?? ?? unit ??????? ??????? t a = 40 to 85 c ????????? ????????? t a = 25 c ??? ??? v cc v ??????? ??????? test conditions ??????? ??????? parameter ???? ???? symbol ?? ?? unit ???? ???? max ???? ???? min ???? ???? max ??? ??? typ ???? ???? min ??? ??? v cc v ??????? ??????? test conditions ??????? ??????? parameter ???? ???? symbol ???? ? ?? ? ???? i oz ??????? ? ????? ? ??????? maximum threestate leakage current ??????? ? ????? ? ??????? v in = v il or v ih v out = v cc or gnd ??? ? ? ? ??? 5.5 ???? ? ?? ? ???? ??? ? ? ? ??? ???? ? ?? ? ???? 0.25 ???? ? ?? ? ???? ???? ? ?? ? ???? 2.5 ?? ?? ?? m a ???? ? ?? ? ???? i cc ??????? ? ????? ? ??????? maximum quiescent supply current ??????? ? ????? ? ??????? v in = v cc or gnd ??? ? ? ? ??? 5.5 ???? ? ?? ? ???? ??? ? ? ? ??? ???? ? ?? ? ???? 4.0 ???? ? ?? ? ???? ???? ? ?? ? ???? 40.0 ?? ?? ?? m a ????????????????????????????????? ac electrical characteristics (input t r = t f = 3.0ns) ???? ???? ????????? ????????? ???????? ???????? ????????? ????????? t a = 25 c ?????? ?????? t a = 40 to 85 c ?? ?? ???? ???? symbol ????????? ????????? parameter ???????? ???????? test conditions ???? ???? min ??? ??? typ ???? ???? max ??? ??? min ???? ???? max ?? ?? unit ???? ? ?? ? ???? t plh , t phl ????????? ? ??????? ? ????????? maximum propagation delay, a to ya or b to yb ???????? ? ?????? ? ???????? v cc = 3.3 0.3v c l = 15pf c l = 50pf ???? ? ?? ? ???? ??? ? ? ? ??? 5.3 7.8 ???? ? ?? ? ???? 7.5 11.0 ??? ? ? ? ??? 1.0 1.0 ???? ? ?? ? ???? 9.0 12.5 ?? ?? ?? ns ???? ? ?? ? ???? ????????? ? ??????? ? ????????? ???????? ? ?????? ? ???????? v cc = 5.0 0.5v c l = 15pf c l = 50pf ???? ? ?? ? ???? ??? ? ? ? ??? 3.6 5.1 ???? ? ?? ? ???? 5.5 7.5 ??? ? ? ? ??? 1.0 1.0 ???? ? ?? ? ???? 6.5 8.5 ?? ?? ?? ???? ? ?? ? ???? t pzl , t pzh ????????? ? ??????? ? ????????? output enable time oea to ya or oeb to yb ???????? ? ?????? ? ???????? v cc = 3.3 0.3v c l = 15pf r l = 1k w c l = 50pf ???? ? ?? ? ???? ??? ? ? ? ??? 6.6 9.1 ???? ? ?? ? ???? 10.6 14.1 ??? ? ? ? ??? 1.0 1.0 ???? ? ?? ? ???? 12.5 16.0 ?? ?? ?? ns ???? ???? ????????? ????????? ???????? ???????? v cc = 5.0 0.5v c l = 15pf r l = 1k w c l = 50pf ???? ???? ??? ??? 4.7 6.2 ???? ???? 7.3 9.3 ??? ??? 1.0 1.0 ???? ???? 8.5 10.5 ?? ?? ???? ? ?? ? ???? t plz , t phz ????????? ? ??????? ? ????????? output disable time oea to ya or oeb to yb ???????? ? ?????? ? ???????? v cc = 3.3 0.3v c l = 50pf r l = 1k w ???? ? ?? ? ???? ??? ? ? ? ??? 10.3 ???? ? ?? ? ???? 14.0 ??? ? ? ? ??? 1.0 ???? ? ?? ? ???? 16.0 ?? ?? ?? ns ???? ? ?? ? ???? ????????? ? ??????? ? ????????? ???????? ? ?????? ? ???????? v cc = 5.0 0.5v c l = 50pf r l = 1k w ???? ? ?? ? ???? ??? ? ? ? ??? 6.7 ???? ? ?? ? ???? 9.2 ??? ? ? ? ??? 1.0 ???? ? ?? ? ???? 10.5 ?? ?? ?? ???? ???? t oslh , t oshl ????????? ????????? output to output skew ???????? ???????? v cc = 3.3 0.3v c l = 50pf (note 1.) ???? ???? ??? ??? ???? ???? 1.5 ??? ??? ???? ???? 1.5 ?? ?? ns ???? ? ?? ? ???? ????????? ? ??????? ? ????????? ???????? ? ?????? ? ???????? v cc = 5.0 0.5v c l = 50pf (note 1.) ???? ? ?? ? ???? ??? ? ? ? ??? ???? ? ?? ? ???? 1.0 ??? ? ? ? ??? ???? ? ?? ? ???? 1.0 ?? ?? ?? ???? ???? c in ????????? ????????? maximum input capacitance ???????? ???????? ???? ???? ??? ??? 4 ???? ???? 10 ??? ??? ???? ???? 10 ?? ?? pf ???? ? ?? ? ???? c out ????????? ? ??????? ? ????????? maximum threestate output capacitance (output in highimpedance state) ???????? ? ?????? ? ???????? ???? ? ?? ? ???? ??? ? ? ? ??? 6 ???? ? ?? ? ???? ??? ? ? ? ??? ???? ? ?? ? ???? ?? ?? ?? pf typical @ 25 c, v cc = 5.0v c pd power dissipation capacitance (note 2.) 17 pf 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 noload 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) t a = 25 c symbol parameter typ max unit v olp quiet output maximum dynamic v ol 0.6 0.9 v v olv quiet output minimum dynamic v ol 0.6 0.9 v v ihd minimum high level dynamic input voltage 3.5 v v ild maximum low level dynamic input voltage 1.5 v
mc74vhc240 http://onsemi.com 152 figure 2. figure 3. v cc gnd a or b ya or yb 50% 50% v cc t phl t plh oea or oeb ya or yb ya or yb 50% 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 *includes all probe and jig capacitance c l * test point device under test output figure 4. test circuit *includes all probe and jig capacitance c l * test point device under test output figure 5. test circuit connect to v cc when testing t plz and t pzl . connect to gnd when testing t phz and t pzh . 1 k w test circuits switching waveforms figure 6. input equivalent circuit input
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