1 truth table (1) function be a0-7 disconnect h hi-z connect l b0-7 description pericom semiconductors pi3vt series of logic circuits are produced using the companys advanced submicron cmos technology, achieving industry leading performance. the PI3VT3245-A is a 2.5v or 3.3v 8-bit, 2-port bus switch designed with a low on-resistance (5?). the switches are turned on or enabled by the bus enable (be) input signal. given a 3.3v supply and an input voltage of 3.3v, the switch translates to an output voltage of 2.5v. similarly, when operated with a 2.5v supply and given 2.5v inputs, the device translates the outputs to 1.8v. notes: 1. h = high voltage level l = low voltage level hi-z = high impedance block diagram pin description pin name description be bus enable input (active low) a 0 -a 7 bus a b 0 -b 7 bus b v cc power gnd ground pin confguration features ? near -zero propagation delay ? low on-resistance switches connect inputs to outputs ? 2.5v to 3.3v supply voltage operation ? 2.5v or 1.8v switching ? packaging (pb-free & green available): C 20-pin, 150-mil wide plastic qsop (q) C 20-pin, 173-mil wide plastic tssop (l) applications ? 3.3v to 2.5v level shifting (voltage translation) ? 2.5v to 1.8v level shifting (voltage translation) v cc be b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 nc a 0 a 1 a 2 a 3 a 4 a 5 a 6 a 7 gnd be a 7 a 0 b 7 b 0 PI3VT3245-A 8-bit, 2-port, low voltage translator bus switch 10/04/11 12-0245
2 storage temperature ......................................................... C65c to +150c ambient temperature with power applied ........................ C40c to +85c supply voltage to ground potential ..................................... C0.5v to +4.6v dc input voltage ................................................................. C0.5v to +5.5v dc output current ............................................................................ 120ma power dissipation ................................................................................. 0.5w note: stresses greater than those listed under maximum ratings 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 sec - tions of this specifcation is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) notes: 1. for max. or min. conditions, use appropriate value specifed under electrical characteristics for the applicable device type. 2. t ypical values are at v cc = 3.3v, t a = 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. measured by the voltage drop between a and b pin at indicated current through the switch. on-resistance is determined by the lower of the voltages on the two (a,b) pins. 5. this parameter is determined by device characterization but is not production tested. capacitance (t a = 25c, f = 1 mhz) parameters (5) description test conditions typ. units c in input capacitance v in = 0v 3.5 pf c off a/b capacitance, switch off 5.0 c on a/b capacitance, switch on 11.2 dc electrical characteristics (over operating range, t a = C40c to +85c, v cc = 3.3v 10%) parameters description test conditions (1) min. typ. (2) max. units v ih input high voltage guaranteed logic high level 2.0 v cc +0.3v v v il input low voltage guaranteed logic low level -0.5 0.8 i ih input high current v cc = max., v in = v cc 1 a i il input low current v cc = max., v in = gnd 1 i ozh high impedance output current 0 a, b v cc 1 r on switch on-resistance v cc = min, v in = 0v, i on = -8ma 5 9 ? v cc = min., v in = 1.7v, i on = -8ma 18 30 v cc = 2.3v., v in = 0v, i on = -8ma 6 10 v cc = 2.3v., v in = 1.3v, i on = -8ma 35 50 vp pass voltage v in = v cc = 3.3v, i out = -5a 2.1 2.3 2.7 v v in = v cc = 2.5v, i out = -5a 1.6 10/04/11 PI3VT3245-A 8-bit, 2-port, low voltage translator bus switch 12-0245
3 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 3 a ?i cc quiescent current per input high v in = 3v (3) 50 notes: 1. for max. or min. conditions, use appropriate value specifed under electrical characteristics for the applicable device. 2. t ypical values are at v cc = 3.3v, +25c ambient. 3. per driven input (control input only); a and b pins do not contribute to i cc . notes: 1. see test circuit and waveforms. 2. this parameter is guaranteed but not tested on propagation delays. 3. the bus switch contributes no propagational delay other than the rc delay of the on-resistance of the switch and the load capacitance. the time constant for the switch alone is of the order of 0.25ns for 50pf load. since this time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. propagational delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side. switching characteristics over 2.5v 0.2v operating range parameters description conditions (1) com. units min. max. t plh t phl propogation delay (2,3) ax to bx c l = 50pf, r l = 500? 0.25 ns t pzh t pzl enable time be to ax or bx c l = 50pf, r l = 500?, r = 500? 1.5 9.8 t phz t plz disable time be to ax or bx 1.5 8.3 switching characteristics over 3.3v 0.3v operating range parameters description conditions (1) com. units min. max. t plh t phl propogation delay (2,3) ax to bx c l = 50pf, r l = 500? 0.25 ns t pzh t pzl enable time be to ax or bx c l = 50pf, r l = 500?, r = 500? 1.5 9.8 t phz t plz disable time be to ax or bx 1.5 8.3 10/04/11 PI3VT3245-A 8-bit, 2-port, low voltage translator bus switch 12-0245
4 packaging mechanical: 20-pin qsop (q) 1 .337 .344 .053 .069 .004 .010 seating plane .025 bsc .007 .010 .228 .244 .150 .157 1 20 x.xx x.xx denotes dimensions in millimeters 0.635 8.56 8.74 1.35 1.75 5.79 6.19 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 description: 20-pin, 150-mil wide, qsop package code: q document control no. pd - 1202 revision: h date: 10/22/07 note: 1) controlling dimensions in inches. 2) ref: jedec mo-137b/ad 3) dimensions do not include mold flash, protrusions or gate burrs pericom semiconductor corporation 3545 n. 1st street, san jose, ca 95134 1-800-435-2335 ? www.pericom.com 10/04/11 PI3VT3245-A 8-bit, 2-port, low voltage translator bus switch 12-0245
5 ordering information ordering code packaging code package description PI3VT3245-Ale l pb-free & green, 20-pin tssop PI3VT3245-Aqe q pb-free & green, 20-pin qsop notes: 1. thermal characteristics can be found on the company web site at www .pericom.com/packaging/ pericom semiconductor corporation ? 1-800-435-2336 ? www .pericom.com packaging mechanical: 20-pin tssop (l) date: 05/03/12 description: 20-pin, 173mil wide tssop package code: l document control #: pd-1311 revision: f notes: 1. refer jedec mo-153f/ac 2. controlling dimensions in millimeters 3. package outline exclusive of mold flash and metal burr 12-0373 10/04/11 PI3VT3245-A 8-bit, 2-port, low voltage translator bus switch 12-0245
|
