1 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter july 2000 1999 integrated device technology, inc. dsc-4754/- c idt74lvc4245a industrial temperature range description: the lvc4245a is manufactured using advanced dual metal cmos technology. this octal noninverting bus transceiver contains two separate supply rails; b port has v ccb , which is set at 3.3v, and a port has v cca , which is set at 5v. this allows for translation from a 3.3v to a 5v environment, and vice-versa. this device is ideal for asynchronous communication between two buses (a and b). the direction control pin (dir) controls the direction of data flow. the output enable pin ( oe ) overrides the direction control and disables both ports. all inputs are designed with hysteresis for improved noise margin. the lvc4245a has been designed with a 24ma output driver. this driver is capable of driving a moderate to heavy load while maintaining speed performance. cmos octal bus transceiver and 3.3v to 5v shifter with 3-state out- puts and 5 volt tolerant i/o functional block diagram dir a 1 a 2 a 3 a 4 a 5 a 6 a 7 a 8 b 8 b 7 b 6 b 5 b 4 b 3 b 2 b 1 oe 2 3 4 5 6 7 8 9 10 14 15 16 17 18 19 20 21 22 5v p ort 3.3v po rt applications: ? 5v and 3.3v mixed voltage systems ? data communication and telecommunication systems features: C 0.5 micron cmos technology Cv cca = 5v 0.5v Cv ccb = 2.7v to 3.6v C cmos power levels (0.4 w typ. static) C rail-to-rail output swing for increased noise margin C all inputs, outputs and i/o are 5 volt tolerant C supports hot insertion C available in soic, ssop, qsop, and tssop packages drive features for lvc4245a: C high output drivers: 24ma C reduced system switching noise
2 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter soic/ ssop/ qsop/ tssop top view pin configuration 2 3 1 a 1 20 19 18 b 4 b 3 b 5 b 1 b 2 15 b 7 b 8 16 9 gnd 10 a 8 b 6 23 22 24 21 17 dir 5 6 a 6 7 a 4 a 5 4 a 2 a 3 so24-2 so24-7 so24-8 so24-9 8 a 7 oe 13 14 11 gnd 12 v ccb (3.3v) v ccb (3.3v) gnd (5v) v cca absolute maximum ratings for v cca (1) symbol description max. unit v term terminal voltage with respect to gnd C 0.5 to +6.5 v t stg storage temperature C 65 to +150 c i out dc output current C 50 to +50 ma i ik i ok continuous clamp current, v i < 0 or v o < 0 C 50 ma i cc i ss continuous current through each v cc or gnd 100 ma absolute maximum ratings for v ccb (1) symbol description max. unit v term terminal voltage with respect to gnd C 0.5 to +6.5 v t stg storage temperature C 65 to +150 c i out dc output current C 50 to +50 ma i ik i ok continuous clamp current, v i < 0 or v o < 0 C 50 ma i cc i ss continuous current through each v cc or gnd 100 ma note: 1. stresses greater than those listed under absolute 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 sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. capacitance (t a = +25c, f = 1.0mh z ) symbol parameter (1) conditions typ. max. unit c in input capacitance v in = 0 or v cca v cca = open 5pf c i/o i/o port capacitance (2) v out = v cca or gnd, v cca = 5v 11 pf c i/o i/o port capacitance (3) v out = v ccb or gnd, v ccb = 3.3v 11 pf notes: 1. as applicable to the device type. 2. for a port only. 3. for b port only. pin description pin names description oe output enable input (active low) dir direction control input ax port a inputs or 3-state outputs bx port b inputs or 3-state outputs function table (1) inputs oe dir outputs l l bus b data to bus a l h bus a data to bus b h x high z state note: 1. h = high volta g e level l = low volta g e level x = dont care
3 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter dc electrical characteristics over operating range (a port) following conditions apply unless otherwise specified: operating condition: t a = C 40c to +85c; v cca = 5v0.5v (1) symbol parameter test conditions min. typ. (2) max. unit v ih input high voltage level v cca = 4.5v to 5.5v 2 v v il input low voltage level v cca = 4.5v to 5.5v 0.8 v i ih i il input leakage current (control inputs) v cca = 5.5v v i = 0 to 5.5v 1 a i ozh high impedance output current v cca = 5.5v v o = 0 to 5.5v 5 a i ozl (3-state output pins) v h input hysteresis v cca = 5.0v 100 mv i ccl i cch quiescent power supply current v cca = 5.5v v in = gnd or v cca 80a i ccz d i cc quiescent power supply current variation one input at 3.4v, other inputs at v cca or gnd v cca = 4.5v to 5.5v 1.5ma notes: 1. v ccb = 2.7v to 3.6v 2. typical values are at v cca = 5.0v, +25c ambient. dc electrical characteristics over operating range (b port) following conditions apply unless otherwise specified: operating condition: t a = C 40c to +85c; v ccb = 2.7v to 3.6v (1) symbol parameter test conditions min. typ. (2) max. unit v ih input high voltage level v ccb = 2.7v to 3.6v 2 v v il input low voltage level v ccb = 2.7v to 3.6v 0.8 v i ozh high impedance output current v ccb = 3.6v v o = 0 to v ccb 5a i ozl (3-state output pins) v h input hysteresis v ccb = 3.3v 100 mv i ccl i cch i ccz quiescent power supply current v ccb = 3.6v v in = gnd or v ccb 50a d i cc quiescent power supply current variation one input at v ccb C 0.6v, other inputs at v ccb or gnd v ccb = 2.7v to 3.6v 500 a notes: 1. v cca = 5v 0.5v 2. typical values are at v ccb = 3.3v, +25c ambient.
4 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter output drive characteristics, v cca = 5v0.5v (a port) symbol parameter test conditions (1) min. max. unit v oh output high voltage v cca = 4.5v i oh = C 0.1ma 4.3 v (b port to a port) v cca = 5.5v 5.3 v cca = 4.5v i oh = C 24ma 3.7 v cca = 5.5v 4.7 v ol output low voltage v cca = 4.5v i ol = 0.1ma 0.2 v (b port to a port) v cca = 5.5v 0.2 v cca = 4.5v i ol = 24ma 0.55 v cca = 5.5v 0.55 note: 1. v ih and v il must be within the min. or max. range shown in the dc electrical characteristics over operating range table for the appropriate v cc range. t a = C40c to +85c, v ccb = 2.7v to 3.6v. output drive characteristics, v ccb = 2.7v to 3.6v (b port) symbol parameter test conditions (1) min. max. unit v oh output high voltage v ccb = 2.7v to 3.6v i oh = C 0.1ma v cc C 0.2 v (a port to b port) v ccb = 2.7v i oh = C 12ma 2.2 v ccb = 3.0v 2.4 v ccb = 3.0v i oh = C 24ma 2 v ol output low voltage v ccb = 2.7v to 3.6v i ol = 0.1ma 0.2 v (a port to b port) v ccb = 2.7v i ol = 12ma 0.4 v ccb = 3.0v i ol = 24ma 0.55 note: 1. v ih and v il must be within the min. or max. range shown in the dc electrical characteristics over operating range table for the appropriate v cc range. t a = C40c to +85c, v cca = 5v 0.5v. operating characteristics, t a = 25c v cca = 5v, v ccb = 3.3v symbol parameter test conditions typical unit c pd power dissipation capacitance per transceiver outputs enabled c l = 0pf, f = 10mhz 39.5 pf c pd power dissipation capacitance per transceiver outputs disabled 5 pf
5 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter switching characteristics (1) v cca = 5v0.5v, v ccb = 2.7v to 3.6v symbol parameter min . max. unit t phl propagation delay 1 6.3 ns t plh ax to bx 1 6.7 t phl propagation delay 1 6.1 ns t plh bx to ax 1 5 t pzl output enable time 1 8.8 ns t pzh oe to bx 19.8 t pzl output enable time 1 9 ns t pzh oe to ax 18.1 t plz output disable time 1 7.7 ns t phz oe to bx 17.8 t plz output disable time 1 7 ns t phz oe to ax 15.8 note: 1. see test circuits and waveforms. t a = C 40c to + 85c.
6 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter t plz t pzh t phz 0v v ol+ 0.3v v oh t pzl v ol v oh- 0.3v 1.5v 3v 0v 1.5v output control v cc output waveform 1 s1 at 2 x v cc (see note b) output waveform 2 s1 at gnd (see note b) 2 x v cc gnd open c l = 50pf (see note a) from output under test s1 500 w 500 w 1.5v v cc 0v 1.5v input t w 1.5v v cc 0v 1.5v input t phl t plh output v oh v ol 50% v cc 50% v cc 50% v cc 50% v cc l o ad cir cuit and v ol t a ge w a veforms load circuit test conditions voltage waveforms pulse duration voltage waveforms enable and disable times low- and high-level enabling voltage waveforms propagation delay times noninverting outputs p arameter measurement informa tion (a por t) test s1 t plh / t phl t plz / t pzl t phz / t pzh open 2 x v cc gnd notes: a. c l includes probe and jig capacitance. b. waveform 1 is for an output with intetnal conditions such that the output is low except when disabled by the output control . waveform 2 is for an output with intetnal 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 10mhz; zo = 50 w ; t f 2.5ns; t r 2.5ns. d. the outputs are measured one at a time with one transition per measurement.
7 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter t plz t pzh t phz 0v v ol+ 0.3v v oh t pzl v ol v oh- 0.3v 1.5v 3v 0v 1.5v output control 3.5v output waveform 1 s1 at 7v (see note b) output waveform 2 s1 at gnd (see note b) 7v gnd open c l = 50pf (see note a) from output under test s1 500 w 500 w 1.5v 3v 0v 1.5v input t w 1.5v 3v 0v 1.5v input t phl t plh output v oh v ol 1.5v 1.5v 1.5v 1.5v l o ad cir cuit and v ol t a ge w a veforms load circuit test conditions voltage waveforms pulse duration voltage waveforms enable and disable times low- and high-level enabling voltage waveforms propagation delay times noninverting outputs p arameter measurement informa tion (b por t) test s1 t plh / t phl t plz / t pzl t phz / t pzh open 7v gnd notes: a. c l includes probe and jig capacitance. b. waveform 1 is for an output with intetnal conditions such that the output is low except when disabled by the output control . waveform 2 is for an output with intetnal 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 10mhz; zo = 50 w ; t f 2.5ns; t r 2.5ns. d. the outputs are measured one at a time with one transition per measurement.
8 industrial temperature range idt74lvc4245a cmos octal bus transceiver and 3.3v to 5v shifter corporate headquarters for sales: 2975 stender way 800-345-7015 or 408-727-6116 santa clara, ca 95054 fax: 408-492-8674 www.idt.com* *to search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2. the idt logo is a registered trademark of integrated device technology, inc. ordering information idt xx lvc xxxx xx package device type temp. range so py q pg 74 small outline ic (gull wing) (so24-2) shrink small outline package (so24-7) quarter size small outline package (so24-8) thin shrink small outline package (so24-9) C40c to +85c x bus-hold 4245a no bus-hold blank octal bus transceiver and 3.3v to 5v shifter with 3-state outputs, 24ma
|
