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74lcx245 ?lo w v olta g e bidirectional t ransceiver with 5v t olerant inputs and outputs ?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 f ebr uar y 2008 74lcx245 low voltage bidirectional transceiver with 5v tolerant inputs and outputs features 5v tolerant inputs and outputs 2.3v to 3.6v v cc specifications provided 7.0ns t pd max. (v cc = 3.3v), 10? i cc max. power down high impedance inputs and outputs supports live insertion/withdrawal (1) ?4ma output drive (v cc = 3.0v) latch-up performance exceeds 500ma esd performance: ? human body model > 2000v ? machine model > 200v leadless dqfn package note: 1. to ensure the high-impedance state during power up or down, oe should be tied to v cc through a pull-up resistor: the minimum value or the resistor is determined by the current-sourcing capability of the driver. general description the lcx245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus oriented applications. the device is designed for low voltage (2.5v and 3.3v) v cc applications with capability of interfacing to a 5v signal environment. the t/r input determines the direction of data flow through the device. the oe input disables both the a and b ports by placing them in a high impedance state. the lcx245 is fabricated with an advanced cmos tech- nology to achieve high speed operation while maintain- ing cmos low power dissipation. or dering inf ormation note: 2. dqfn package available in tape and reel only. device also available in tape and reel. specify by appending suffix letter ??to the ordering number. all pac kages are lead free per jedec: j-std-020b standard. or der number pa c k a g e number p a c k a g e description 74lcx245wm m20b 20-lead small outline integ r ated circuit (soic), jedec ms-013, 0.300" wide 74lcx245sj m20d 20-lead small outline p a c kage (sop), eiaj type ii, 5.3mm wide 74lcx245bqx (2) mlp20b 20-t er minal depopulated quad v e r y-thin flat p a c k no leads (dqfn), jedec mo-241, 2.5 x 4.5mm 74lcx245msa msa20 20-lead shr ink small outline p a c kage (ssop), jedec mo-150, 5.3mm wide 74lcx245mtc mtc20 20-lead thin shr ink small outline p a c kage (tssop), jedec mo-153, 4.4mm wide implements proprietary noise/emi reduction circuitry
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 2 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs connection diagrams pin assignments for soic, sop, ssop, and tssop pin assignment for dqfn (top through view) pin description logic symbol truth table h = high voltage level l = low voltage level x = immaterial z = high impedance note: 3. unused bus terminals during high z state must be held high or low. logic diagram pin names description oe output enable input t/r tr ansmit/receive input a 0 ? 7 side a inputs or 3-state outputs b 0 ? 7 side b inputs or 3-state outputs inputs outputs oe t/r ll bus b 0 ?b 7 data to bus a 0 ?a 7 lh bus a 0 ?a 7 data to bus b 0 ?b 7 hx high z state on a 0 ?a 7 , b 0 ?b 7 (3)
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 3 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. note: 4. i o absolute maximum rating must be observed. recommended operating conditions (5) the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. note: 5. unused inputs must be held high or low. they may not float. symbol parameter rating v cc supply voltage ?.5v to +7.0v v i dc input voltage ?.5v to +7.0v v o dc output voltage output in 3-state ?.5v to +7.0v output in high or low state (4) ?.5v to v cc + 0.5v i ik dc input diode current, v i < gnd ?0ma i ok dc output diode current v o < gnd ?0ma v o > v cc +50ma i o dc output source/sink current ?0ma i cc dc supply current per supply pin ?00ma i gnd dc ground current per ground pin ?00ma t stg storage temperature ?5? to +150? symbol parameter min. max. units v cc supply voltage operating 2.0 3.6 v data retention 1.5 3.6 v i input voltage 0 5.5 v v o output voltage 3-state 0 5.5 v high or low state 0 v cc i oh / i ol output current v cc = 3.0v?.6v ?4 ma v cc = 2.7v?.0v ?2 v cc = 2.3v?.7v ? t a f ree-air operating temperature ?0 85 ? ? t / ? v input edge rate, v in = 0.8v?.0v, v cc = 3.0v 0 10 ns / v
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 4 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs dc electrical characteristics note: 6. outputs disabled or 3-state only. ac electrical characteristics note: 7. skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. the specification applies to any outputs switching in the same direction, either high-to-low (t oshl ) or low-to-high (t oslh ). symbol parameter v cc (v) conditions t a = ?0? to +85? units min. max. v ih high level input voltage 2.3?.7 1.7 v 2.7?.6 2.0 v il low level input voltage 2.3?.7 0.7 v 2.7?.6 0.8 v oh high level output voltage 2.3?.6 i oh = ?00? v cc ?0.2 v 2.3 i oh = ?ma 1.8 2.7 i oh = ?2ma 2.2 3.0 i oh = ?8ma 2.4 i oh = ?4ma 2.2 v ol low level output voltage 2.3?.6 i ol = 100? 0.2 v 2.3 i ol = 8ma 0.6 2.7 i ol = 12ma 0.4 3.0 i ol = 16ma 0.4 i ol = 24ma 0.55 i i input leakage current 2.3?.6 0 v i 5.5v ?.0 ? i oz 3-state output leakage 2.3?.6 0 v o 5.5v, v i = v ih or v il ?.0 ? i off po w er-off leakage current 0 v i or v o = 5.5v 10 ? i cc quiescent supply current 2.3?.6 v i = v cc or gnd 10 ? 3.6v v i , v o 5.5v (6) ?0 ? i cc increase in i cc per input 2.3?.6 v ih = v cc ?0.6v 500 ? symbol parameter t a = ?0? to +85?, r l = 500 ? units v cc = 3.3v ?0.3v, c l = 50pf v cc = 2.7v, c l = 50pf v cc = 2.5v ?0.2v, c l = 30pf min. max. min. max. min. max. t phl , t plh propagation delay, a n to b n or b n to a n 1.5 7.0 1.5 8.0 1.5 8.4 ns t pzl , t pzh output enable time 1.5 8.5 1.5 9.5 1.5 10.5 ns t plz , t phz output disable time 1.5 7.5 1.5 8.5 1.5 9.0 ns t oshl , t oslh output to output skew (7) 1.0 ns
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 5 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs dynamic switching characteristics capacitance symbol parameter v cc (v) conditions t a = 25? unit t ypical v olp quiet output dynamic peak v ol 3.3 c l = 50pf, v ih = 3.3v, v il = 0v 0.8 v 2.5 c l = 30pf, v ih = 2.5v, v il = 0v 0.6 v olv quiet output dynamic valley v ol 3.3 c l = 50pf, v ih = 3.3v, v il = 0v ?.8 v 2.5 c l = 30pf, v ih = 2.5v, v il = 0v ?.6 symbol parameter conditions typical units c in input capacitance v cc = open, v i = 0v or v cc 7.0 pf c out output capacitance v cc = 3.3v, v i = 0v or v cc 8.0 pf c pd po w er dissipation capacitance v cc = 3.3v, v i = 0v or v cc , f = 10mhz 25.0 pf
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 6 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs ac loading and waveforms (generic for lcx family) figure 1. ac test circuit (c l includes probe and jig capacitance) waveform for inverting and non-inverting functions propagation delay. pulse width and t rec waveforms 3-state output low enable and disable times for logic 3-state output high enable and disable times for logic setup time, hold time and recovery time for logic t rise and t fall figure 2. waveforms (input characteristics; f = 1mhz, t r = t f = 3ns) t est switch t plh , t phl open t pzl , t plz 6v at v cc = 3.3 ?0.3v v cc x 2 at v cc = 2.5 ?0.2v t pzh , t phz gnd symbol v cc 3.3v ?0.3v 2.7v 2.5v ?0.2v v mi 1.5v 1.5v v cc / 2 v mo 1.5v 1.5v v cc / 2 v x v ol + 0.3v v ol + 0.3v v ol + 0.15v v y v oh ?0.3v v oh ?0.3v v oh ?0.15v
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 7 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs schematic diagram (generic for lcx family)
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 8 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs tape and reel specification t ape format for dqfn t ape dimension inches (millimeters) reel dimensions inches (millimeters) pa ck ag e designator tape section number of cavities cavity status cover tape status bqx leader (start end) 125 (typ.) empty sealed carrier 3000 filled sealed tr ailer (hub end) 75 (typ.) empty sealed t ape size a b c d n w1 w2 12mm 13.0 (330.0) 0.059 (1.50) 0.512 (13.00) 0.795 (20.20) 2.165 (55.00) 0.488 (12.4) 0.724 (18.4)
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 9 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs physical dimensions figure 3. 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide pa c kage drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package speci?ations do not expand the terms of fairchilds worldwide terms and conditions, speci?ally the warranty therein, which covers fairchild products. always visit fairchild semiconductors online packaging area for the most recent package drawings: http://www .f airchildsemi.com/pac kaging/ 0.10 c c a see detail a notes: unless otherwise specified a) this package conforms to jedec ms-013, variation ac, issue e b) all dimensions are in millimeters. c) dimensions do not include mold flash or burrs. e) landpattern standard: soic127p1030x265-20l pin one indicator 0.25 1 10 b c a m 20 11 b x45 8 0 seating plane gage plane detail a scale: 2:1 seating plane land pattern recommendation f) drawing filename: mkt-m20brev3 0.65 1.27 2.25 9.50 13.00 12.60 11.43 7.60 7.40 10.65 10.00 0.51 0.35 1.27 2.65 max 0.30 0.10 0.33 0.20 0.75 0.25 (r0.10) (r0.10) 1.27 0.40 (1.40) 0.25 d) conforms to asme y14.5m-1994
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 10 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs physical dimensions (continued) figure 4. 20-lead small outline package (sop), eiaj type ii, 5.3mm wide pa c kage drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package speci?ations do not expand the terms of fairchilds worldwide terms and conditions, speci?ally the warranty therein, which covers fairchild products. always visit fairchild semiconductors online packaging area for the most recent package drawings: http://www .f airchildsemi.com/pac kaging/
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 11 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs physical dimensions (continued) figure 5. 20-terminal depopulated quad very-thin flat pack no leads (dqfn), jedec mo-241, 2.5 x 4.5mm pa c kage drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package speci?ations do not expand the terms of fairchilds worldwide terms and conditions, speci?ally the warranty therein, which covers fairchild products. always visit fairchild semiconductors online packaging area for the most recent package drawings: http://www .f airchildsemi.com/pac kaging/
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 12 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs physical dimensions (continued) figure 6. 20-lead shrink small outline package (ssop), jedec mo-150, 5.3mm wide pa c kage drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package speci?ations do not expand the terms of fairchilds worldwide terms and conditions, speci?ally the warranty therein, which covers fairchild products. always visit fairchild semiconductors online packaging area for the most recent package drawings: http://www .f airchildsemi.com/pac kaging/
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 13 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs physical dimensions (continued) figure 8. 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide pa c kage drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package speci?ations do not expand the terms of fairchilds worldwide terms and conditions, speci?ally the warranty therein, which covers fairchild products. always visit fairchild semiconductors online packaging area for the most recent package drawings: http://www .f airchildsemi.com/pac kaging/
?994 fairchild semiconductor corporation www.fairchildsemi.com 74lcx245 rev. 1.11.0 14 trademarks th ef ollowing includes registered and unregistered trademarks and service marks, owned by fairchild semiconductor and/or its global s ubsidiaries, and is not intended to be an exhaustive list of all such trademarks. acex build it now coreplus crossvolt ctl current transfer logic ecospark ezswit ch * fairchild fairchild semiconductor fact quiet series fact fast fastvcore flashwriter ? fps frfet global power resource sm green fps green fpse-series gto i-lo intellimax isopla nar m egabuck mi crocoupler microfet micropak mi llerdrive mo ti on-spm optologic optopl anar pdp-spm pow er220 poweredge power-spm po we rtrench pr ogrammable active droop qfet qs qt optoelectronics quiet series rapidconfigure smart start spm stealth s uperfet su persot -3 s upersot-6 s upersot-8 s upremos syncfet the power franchise tinyboost tinybuck tinylogic tinyopto tinypower tinypwm tinywire serdes uhc ultra f rfet unifet vcx *ezswi tch and flashwriter are trademarks of system general corporation, used under license by fairchild semiconductor. disc laimer fa i rchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function, or design. fairchild does not assume any liability arising out of the application or use of any pro duct or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these speci fications do not expand t he terms of fairchild? wo rl dw ide terms and conditions, specifically the warranty therein, which covers these products. life support policy fa i rchilds products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems wh ic h, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform wh en properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. pr oduct status definitions defi nition of terms da tasheet identification product status definition ad vance information formative or in design this datasheet contains the design specifications for product development. specifications may change in any manner without notice. pr eliminary first production this datasheet contains preliminary data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to ma ke c hanges at any time without notice to improve design. no identification needed full production this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice to improve the des i gn. obsolete not in production this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. rev. i33 74lcx245 ?low voltage bidirectional transceiver with 5v tolerant inputs and outputs

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