1 ps2058f 06/05/06 pi74LPT244 fast cmos 3.3v 8-bit buffer/line driver block diagram pin confguration description pericom semiconductors pi74LPT244 is an 8-bit buffer/line driver designed for driving high capacitive memory loads. with its balanced-drive characteristics, this high-speed, low power device provides lower ground bounce, transmission line matching of signals, fewer line refections and lower emi and rfi effects. this makes it ideal for driving on-board buses and transmission lines. the pi74LPT244 can be driven from either 3.3v or 5.0v devices allowing this device to be used as a translator in a mixed 3.3/5.0v system. features ? compatible with lcx ? and lvt ? families of products ? supports 5v tolerant mixed signal mode operation C input can be 3v or 5v C output can be 3v or connected to 5v bus ? advanced low power cmos operation ? excellent output drive capability: balanced drives (24ma sink and source) ? low ground bounce outputs ? hysteresis on all inputs ? industrial operating temperature range: C40c to +85c ? packages (pb-free & green available): C 20-pin 173-mil wide plastic tssop (l) C 20-pin 150-mil wide plastic qsop (q) C 20-pin 300-mil wide plastic soic (s) C 20-pin 209-mil wide plastic ssop (h) oe a da 0 ob 0 da 1 ob 1 da 2 ob 2 da 3 ob 3 gnd v cc oe b oa 0 db 0 oa 1 db 1 oa 2 db 2 oa 3 db 3 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 20-pin l20 q20 s20 06-0181
pi74LPT244 3.3v 8-bit buffer /line driver 2 ps2058f 06/05/06 maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) note: stresses greater than those listed under maximum rat - ings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specifcation is not implied. exposure to absolute maximum rating conditions for ex - tended periods may affect reliability. storage temperature .............................................................. C55c to +125c ambient temperature with power applied ............................. C40c to +85c supply voltage to ground potential (inputs & vcc only) ....... C0.5v to +7.0v supply voltage to ground potential (outputs & d/o only) .... C0.5v to +7.0v dc input voltage ............................................................... ....... C0.5v to +7.0v dc output current ............................................................... .................. 120 ma power dissipation ............................................................... ....................... 1.0w pin description pin name description oe a , oe b 3-state output enable inputs (active low) dxx inputs oxx outputs gnd ground v cc power truth table (1) inputs outputs oe a oe b d xx o xx l l l l l l h h h h x z notes: 1. h = high voltage level, x = don't care, l = low voltage level, z = high impedance 06-0181
pi74LPT244 3.3v 8-bit buffer /line driver 3 ps2058f 06/05/06 notes: 1. for max. or min. conditions, use appropriate value specifed under electrical characteristics for the applicable device type. 2. typical values are at v cc = 3.3v, +25c ambient and maximum loading. 3. not more than one output should be shorted at one time. duration of the test should not exceed one second. 4. this parameter is guaranteed but not tested. 5. v oh = v cc C 0.6v at rated current. dc electrical characteristics (over the operating range, t a = C40c to +85c, v cc = 2.7v to 3.6v) parameters description test conditions (1) min. typ (2) max. units v ih input high voltage (input pins) guaranteed logic high level 2.2 5.5 v input high voltage (i/o pins) 2.0 5.5 v il input low voltage (input and i/o pins) guaranteed logic low level C0.5 0.8 i ih input high current (input pins) v cc = max. v in = 5.5v 1 a input high current (i/o pins) v cc = max. v in = v cc 1 i il input low current (input pins) v cc = max. v in = gnd 1 input low current (i/o pins) v cc = max. v in = gnd 1 i ozh high impedance output current v cc = max. v out = 5.5v 1 i ozl ( 3-state output pins) v cc = max. v out = gnd 1 v ik clamp diode voltage v cc = min., i in = C18 ma C0.7 C1.2 v i odh output high current v cc = 3.3v, v in = v ih or v il , v o = 1.5v C36 C60 C110 ma i odl output low current v cc = 3.3v, v in = v ih or v il , v o = 1.5v 50 90 200 v oh output high voltage v cc = min. v in = v ih or v il i oh = C0.1 ma v cc - 0.2 v i oh = C3 ma 2.4 3.0 v cc = 3.0v, v in = v ih or v il i oh = C8 ma 2.4 (5) 3.0 i oh = C24 ma 2.0 v ol output low voltage v cc = min. v in = v ih or v il i ol = 0.1 ma 0.2 i ol = 16 ma 0.2 0.4 i ol = 24 ma 0.3 0.5 i os short circuit current v cc = max. , v out = gnd C60 C85 C240 ma i off power down disable v cc = 0v, v in or v out 4.5v 100 a v h input hysteresis 150 mv 06-0181
pi74LPT244 3.3v 8-bit buffer /line driver 4 ps2058f 06/05/06 power supply characteristics parameters description test conditions (1) min. typ (2) max. units i cc quiescent power supply current v cc = max. v in = gnd or v cc 0.1 10 a i cc quiescent power supply current ttl inputs high v cc = max. v in = v cc C 0.6v (3) 500 a i ccd dynamic power supply (4) v cc = max., outputs open oe x = gnd one bit toggling 50% duty cycle v in = v cc v in = gnd 50 75 a/ mhz i c total power supply current (6) v cc = max., outputs open f i = 10 mh z 50% duty cycle oe x = gnd one bit toggling v in = v cc C 0.6v v in = gnd 0.6 2.3 ma v cc = max., outputs open f i = 2.5 mh z 50% duty cycle oe x = gnd 8 bits toggling v in = v cc C 0.6v v in = gnd 2.1 4.7 (5) ma notes: 1. for max. or min. conditions, use appropriate value specifed under electrical characteristics for the applicable device. 2. typical values are at vcc = 3.3v, +25c ambient. 3. per ttl driven input; all other inputs at vcc or gnd. 4. this parameter is not directly testable, but is derived for use in total power supply calculations. 5. values for these conditions are examples of the icc formula. these limits are guaranteed but not tested. 6. i c =i quiescent + i inputs + i dynamic i c = i cc + i cc d h n t + i ccd ( f cp /2 + f i n i ) i cc = quiescent current (i ccl , i cch and i ccz ) i cc = power supply current for a ttl high input d h = duty cycle for ttl inputs high n t = number of ttl inputs at d h i ccd = dynamic current caused by an input transition pair (hlh or lhl) f cp = clock frequency for register devices (zero for non-register devices) n cp = number of clock inputs at f cp f i = input frequency n i = number of inputs at f i all currents are in milliamps and all frequencies are in megahertz. capacitance ( t a = 25c, f = 1 mhz) parameters (1) description test conditions typ max. units c in input capacitance v in = 0v 4.5 6 pf c out output capacitance v out = 0v 5.5 8 notes: 1. this parameter is determined by device characterization but is not production tested. 06-0181
pi74LPT244 3.3v 8-bit buffer /line driver 5 ps2058f 06/05/06 notes: 1. propagation delays and enable/disable times are with vcc = 3.3v 0.3v, normal range. for vcc = 2.7v, extended range, all propagation delays and enable/disable times should be degraded by 20%. 2. minimum limits are guaranteed but not tested on propagation delays. 3. this parameter is guaranteed but not production tested. 4. skew between any two outputs, of the same package, switching in the same direction. this parameter is guaranteed by design. switching characteristics over operating range (1) parameters description conditions lpt244 lpt244a lpt244c units com. com. com. min. (2) max min. (2) max. min. (2) max. t plh t phl propagation delay d xx to o xx c l = 50 p f r l = 500 1.5 6.5 1.5 4.8 1.5 4.1 ns t pzh t pzl output enable time oex to oxx 1.5 8.0 1.5 6.2 1.5 5.8 t phz t plz output disable time (3) oex to oxx 1.5 7.0 1.5 5.6 1.5 5.2 t sk( o ) output skew (4) 0.5 0.5 0.5 packaging mechanical: 20-pin qsop (q) .337 .344 .053 .069 .004 .010 seating plane .025 bsc .007 .010 .228 .244 .150 .157 1 20 .016 .050 x.xx x.xx denotes dimensions in millimeters 0.635 8.56 8.74 1.35 1.75 5.79 6.19 0.41 1.27 0.101 0.254 .008 .012 0.203 0.305 3.81 3.99 0.178 0.254 .058 1.47 .015 x 45? 0.38 ref detail a detail a .008 0.20 min. guage plane .010 0.254 .041 1.04 ref .016 .035 0.41 0.89 0?-6? .008 .013 0.20 0.33 06-0181
pi74LPT244 3.3v 8-bit buffer /line driver 6 ps2058f 06/05/06 packaging mechanical: 20-pin tssop (l) packaging mechanical: 20-pin soic (s) seating plane .050 bsc 1 20 0-8? .2914 .2992 x.xx x.xx denotes controlling dimensions in millimeters 7.40 7.60 .496 .511 12.60 12.99 1.27 .0926 .1043 2.35 2.65 .394 .419 10.00 10.65 .0040 .0118 0.10 0.30 .013 .020 0.33 0.51 .010 .029 0.254 0.737 .0091 .0125 0.23 0.32 0.41 1.27 .016 .050 x 45? .020 .030 0.508 0.762 ref ???? ????? ? ???? ???? ???? ???? ??? ???? ????? ????? ??? ???? ???? ???? ???? ???? ???? ? ?? ???? ???? ???? ???? ??? ??? ???? ???? ???? ????? ??? ??? ??? ??? ???? ???? ???? ???? ???? ??? 06-0181
pi74LPT244 3.3v 8-bit buffer /line driver 7 ps2058f 06/05/06 packaging mechanical: 20-pin ssop (h) ???? ?????? ? ???? ???? ??? ???? ?????? ????? ???? ????? ???? ???? ???? ???? ???? ???? ???? ? ?? ???? ???? ???? ????? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ??? ??? 06-0181
pi74LPT244 3.3v 8-bit buffer /line driver 8 ps2058f 06/05/06 pericom semiconductor corporation ? 1-800-435-2336 ? www.pericom.com ordering information ordering code package code speed grade description pi74LPT244q q blank 20-pin 150-mil wide plastic qsop pi74lpt 244qe q blank pb-free & green 20-pin 150-mil wide plastic qsop pi74LPT244l l blank 20-pin 173-mil wide plastic tssop pi74LPT244le l blank pb-free & green, 20-pin 173-mil wide plastic tssop pi74LPT244aq q a 20-pin 150-mil wide plastic qsop pi74lpt 244aqe q a pb-free & green 20-pin 150-mil wide plastic qsop pi74LPT244as s a 20-pin 300-mil wide plastic soic pi74LPT244ase s a pb-free & green, 20-pin 300-mil wide plastic soic pi74LPT244cq q c 20-pin 150-mil wide plastic qsop pi74LPT244cs s c 20-pin 300-mil wide plastic soic pi74LPT244cse s c pb-free & green, 20-pin 300-mil wide plastic soic pi74lpt 244cqe q c pb-free & green, 20-pin 150-mil wide plastic qsop pi74lpt 244ah h a 20-pin 209-mil wide plastic ssop pi74lpt 244ahe h a pb-free & green, 20-pin 209-mil wide plastic ssop notes: ? thermal characteristics can be found on the company web site at www.pericom.com/packaging/ ? e = pb-free and green ? adding an x suffx = tape/reel 06-0181
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