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? 2004 fairchild semiconductor corporation ds500170 www.fairchildsemi.com june 1999 revised november 2004 74vcx2245 low voltage bidirectional transceiver with 3.6v tolerant inputs and outputs and 26 ? series resistors in b outputs 74vcx2245 low voltage bidirectional transceiver with 3.6v tolerant inputs and outputs and 26 ? series resistors in b outputs general description the vcx2245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus ori- ented applications. the t/r input determines the direction of data flow. the oe input disables both the a and b ports by placing them in a high impedance state. the 74vcx2245 is designed for low voltage (1.4v to 3.6v) v cc applications with i/o compatibility up to 3.6v. the vcx2245 is also designed with 26 ? series resistance in the b port outputs. this design reduces line noise in appli- cations such as memory address drivers, clock drivers, and bus transceivers transmitters the 74vcx2245 is fabricated with an advanced cmos technology to achieve high-speed operation while main- taining low cmos power dissipation. features 1.4v - 3.6v v cc supply operation 3.6v tolerant inputs and outputs 26 ? series resistors in b port outputs power-off high impedance inputs and outputs supports live insertion and withdrawal (note 1) t pd (a to b) 4.4 ns max for 3.0v to 3.6v v cc static drive (i oh /i ol b outputs): 12 ma @ 3.0v v cc uses patented quiet series ? noise/emi reduction circuitry latchup performance exceeds jedec 78 conditions esd performance: human body model > 2000v machine model > 200v leadless dqfn package note 1: to ensure the high impedance state during power up and power down, oe n should be tied to v cc through a pull up resistor. the minimum value of the resistor is determined by the current sourcing capability of the driver. ordering code: devices also available in tape and reel. specify by appending the suffix letter ?x? to the ordering code. note 2: dqfn package available in tape and reel only. logic symbol pin descriptions quiet series ? is a trademark of fairchild semiconductor corporation. order number package number package description 74vcx2245wm m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74vcx2245bqx (note 2) mlp020b 20-terminal depopulated quad very-thin flat pack no leads (dqfn), jedec mo-241, 2.5 x 4.5mm 74vcx2245mtc mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide pin names description oe output enable input (active low) t/r transmit/receive input a 0 ? a 7 side a inputs or 3-state outputs b 0 ? b 7 side b inputs or 3-state outputs
www.fairchildsemi.com 2 74vcx2245 connection diagrams pin assignments for soic and tssop pad assignments for dqfn (top through view) 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 inputs outputs oe t/r l l bus b 0 ? b 7 data to bus a 0 ? a 7 l h bus a 0 ? a 7 data to bus b 0 ? b 7 h x high z state on a 0 ? a 7 , b 0 ? b 7 (note 3)
3 www.fairchildsemi.com 74vcx2245 absolute maximum ratings (note 4) recommended operating conditions (note 6) note 4: the absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. the device should not be operated at these limits. the parametric values defined in the electrical characteristics tables are not guaranteed at the absolute maximum rat- ings. the ? recommended operating conditions ? table will define the condi- tions for actual device operation. note 5: i o absolute maximum rating must be observed. note 6: floating or unused inputs must be held high or low. dc electrical characteristics supply voltage (v cc ) ? 0.5v to + 4.6v dc input voltage (v i ) ? 0.5v to + 4.6v dc output voltage (v o ) outputs 3-state ? 0.5v to + 4.6v outputs active (note 5) ? 0.5v to v cc + 0.5v dc input diode current (i ik ) v i < 0v ? 50 ma dc output diode current (i ok ) v o < 0v ? 50 ma v o > v cc + 50 ma dc output source/sink current 50 ma (i oh /i ol ) dc v cc or ground current 100 ma storage temperature (t stg ) ? 65 c to + 150 c power supply voltage (v cc ) operating 1.4v to 3.6v input voltage ? 0.3v to 3.6v output voltage (v o ) output in active states 0v to v cc output in 3-state 0v to 3.6v output current in i oh /i ol - a outputs v cc = 3.0v to 3.6v 24 ma v cc = 2.3v to 2.7v 18 ma v cc = 1.65v to 2.3v 6 ma v cc = 1.4v to 1.65v 2 ma output current in i oh /i ol - b outputs v cc = 3.0v to 3.6v 12 ma v cc = 2.3v to 2.7v 8 ma v cc = 1.65v to 2.3v 3 ma v cc = 1.4v to 1.65v 1 ma free air operating temperature (t a ) ? 40 c to + 85 c minimum input edge rate ( ? t/ ? v) v in = 0.8v to 2.0v, v cc = 3.0v 10 ns/v symbol parameter conditions v cc min max units (v) v ih high level input voltage 2.7 - 3.6 2.0 v 2.3 - 2.7 1.6 1.65 - 2.3 0.65 x v cc 1.4 - 1.6 0.65 x v cc v il low level input voltage 2.7 - 3.6 0.8 v 2.3 - 2.7 0.7 1.65 - 2.3 0.35 x v cc 1.4 - 1.6 0.35 x v cc v oh high level output voltage i oh = ? 100 a 2.7 - 3.6 v cc - 0.2 v a outputs i oh = ? 12 ma 2.7 2.2 i oh = ? 18 ma 3.0 2.4 i oh = ? 24 ma 3.0 2.2 i oh = ? 100 a 2.3 - 2.7 v cc - 0.2 i oh = ? 6 ma 2.3 2.0 i oh = ? 12 ma 2.3 1.8 i oh = ? 18 ma 2.3 1.7 i oh = ? 100 a 1.65 - 2.3 v cc - 0.2 i oh = ? 8 ma 1.65 1.25 i oh = ? 100 a 1.4 - 1.6 v cc - 0.2 i oh = ? 2 ma 1.4 1.05
www.fairchildsemi.com 4 74vcx2245 dc electrical characteristics (continued) note 7: outputs disabled or 3-state only. symbol parameter conditions v cc min max units (v) v oh high level output voltage i oh = ? 100 a 2.7 - 3.6 v cc - 0.2 v b outputs i oh = ? 6 ma 2.7 2.2 i oh = ? 8 ma 3.0 2.4 i oh = ? 12 ma 3.0 2.2 i oh = ? 100 a 2.3 - 2.7 v cc - 0.2 i oh = ? 4 ma 2.3 2.0 i oh = ? 6 ma 2.3 1.8 i oh = ? 8 ma 2.3 1.7 i oh = ? 100 a 1.65 - 2.3 v cc - 0.2 i oh = ? 3 ma 1.65 1.25 i oh = ? 100 a 1.4 - 1.6 v cc - 0.2 i oh = ? 1 ma 1.4 1.05 v ol low level output voltage i ol = 100 a 2.7 - 3.6 0.2 v a outputs i ol = 12 ma 2.7 0.4 i ol = 18 ma 3.0 0.4 i ol = 24 ma 3.0 0.55 i ol = 100 a 2.3 - 2.7 0.2 i ol = 12 ma 2.3 0.4 i ol = 18 ma 2.3 0.6 i ol = 100 a 1.65 - 2.3 0.2 i ol = 6 ma 1.65 0.3 i ol = 100 a 1.4 - 1.6 0.2 i ol = 2 ma 1.4 0.35 v ol low level output voltage i ol = 100 a 2.7 - 3.6 0.2 v b outputs i ol = 6 ma 2.7 0.4 i ol = 8 ma 3.0 0.55 i ol = 12 ma 3.0 0.8 i ol = 100 a2.7- 2.70.2 i ol = 6 ma 2.3 0.4 i ol = 8 ma 2.3 0.6 i ol = 100 a 1.65 - 2.3 0.2 i ol = 3 ma 1.65 0.3 i ol = 100 a 1.4 - 1.6 0.2 i ol = 1 ma 1.4 0.35 i i input leakage current 0 v i 3.6v 1.4 - 3.6 5.0 a i oz 3-state output leakage 0 v o 3.6v 1.4 - 3.6 10 a v i = v ih or v il i off power off leakage current 0 (v i , v o ) 3.6v 0 10 a i cc quiescent supply current v i = v cc or gnd 1.4 - 3.6 20 a v cc (v i , v o ) 3.6v (note 7) 1.4 - 3.6 20 ? i cc increase in i cc per input v ih = v cc ? 0.6v 2.7 - 3.6 750 a
5 www.fairchildsemi.com 74vcx2245 ac electrical characteristics (note 8) note 8: for c l = 50 pf, add approximately 300 ps to the ac maximum specification. note 9: skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of th e 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 conditions v cc t a = ? 40 c to + 85 c units figure (v) min max number t phl propagation delay c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 3.5 ns figures 1, 2 t plh b n to a n 2.5 0.2 0.8 4.2 1.8 0.15 1.5 8.4 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 16.8 figures 5, 6 t pzl output enable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 4.5 ns figures 1, 3, 4 t pzh b n to a n 2.5 0.2 0.8 5.6 1.8 0.15 1.5 9.8 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 19.6 figures 5, 7, 8 t plz output disable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 3.6 ns figures 1, 3, 4 t phz b n to a n 2.5 0.2 0.8 4.0 1.8 0.15 1.5 7.2 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 14.4 figures 5, 7, 8 t oshl output to output skew c l = 30 pf, r l = 500 ? 3.3 0.3 0.5 ns t oslh (note 9) 2.5 0.2 0.5 1.8 0.15 0.75 c l = 15 pf, r l = 2k ? 1.5 0.1 1.5 t phl propagation delay c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 4.4 ns figures 1, 2 t plh a n to b n 2.5 0.2 0.8 5.6 1.8 0.15 1.5 9.8 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 19.6 figures 5, 6 t pzl output enable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 5.0 ns figures 1, 3, 4 t pzh a n to b n 2.5 0.2 0.8 6.6 1.8 0.15 1.5 9.8 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 19.6 figures 5, 7, 8 t plz output disable time c l = 30 pf, r l = 500 ? 3.3 0.3 0.6 4.2 ns figures 1, 3, 4 t phz a n to b n 2.5 0.2 0.8 4.7 1.8 0.15 1.5 8.5 c l = 15 pf, r l = 2k ? 1.5 0.1 1.0 16.9 figures 5, 7, 8
www.fairchildsemi.com 6 74vcx2245 dynamic switching characteristics capacitance symbol parameter conditions v cc t a = 25 c units (v) typical v olp quiet output dynamic peak v ol ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 0.3 v b to a 2.5 0.7 3.3 1.0 quiet output dynamic peak v ol , c l = 30 pf, v ih = v cc , v il = 0v 1.8 0.2 v a to b 2.5 0.45 3.3 0.65 v olv quiet output dynamic valley v ol , c l = 30 pf, v ih = v cc , v il = 0v 1.8 ? 0.3 v b to a 2.5 ? 0.7 3.3 ? 1.0 quiet output dynamic valley, v ol ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 ? 0.2 v a to b 2.5 ? 0.45 3.3 ? 0.65 v ohv quiet output dynamic valley v oh ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 1.3 v b to a 2.5 1.7 3.3 2.0 quiet output dynamic valley v oh ,c l = 30 pf, v ih = v cc , v il = 0v 1.8 1.5 v a to b 2.5 2.0 3.3 2.5 symbol parameter conditions t a = + 25 c units typical c in input capacitance v i = 0v or v cc , v cc = 1.8v, 2.5v or 3.3v 6 pf c i/o input/output capacitance v i = 0v or v cc , v cc = 1.8v, 2.5v or 3.3v 7 pf c pd power dissipation capacitance v i = 0v or v cc , f = 10 mhz, v cc = 1.8v, 2.5v or 3.3v 20 pf
7 www.fairchildsemi.com 74vcx2245 ac loading and waveforms (v cc 3.3v 0.3v to 1.8v 0.15v) figure 1. ac test circuit figure 2. waveform for inverting and non-inverting functions figure 3. 3-state output high enable and disable times for low voltage logic figure 4. 3-state output low enable and disable times for low voltage logic test 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 = 2.5v 0.2v; 1.8v 0.15v t pzh , t phz gnd symbol v cc 3.3v 0.3v 2.5v 0.2v 1.8v 0.15v v mi 1.5v v cc /2 v cc /2 v mo 1.5v v cc /2 v cc /2 v x v ol + 0.3v v ol + 0.15v v ol + 0.15v v y v oh ? 0.3v v oh ? 0.15v v oh ? 0.15v
www.fairchildsemi.com 8 74vcx2245 ac loading and waveforms (v cc 1.5v 0.1v) figure 5. ac test circuit figure 6. waveform for inverting and non-inverting functions figure 7. 3-state output high enable and disable times for low voltage logic figure 8. 3-state output low enable and disable times for low voltage logic test switch t plh , t phl open t pzl , t plz v cc x 2 at v cc = 1.5v 0.1v t pzh , t phz gnd symbol v cc 1.5v 0.1v v mi v cc /2 v mo v cc /2 v x v ol + 0.1v v y v oh ? 0.1v
9 www.fairchildsemi.com 74vcx2245 tape and reel specification tape format for dqfn tape dimensions inches (millimeters) reel dimensions inches (millimeters) package tape number cavity cover tape designator section cavities status status leader (start end) 125 (typ) empty sealed bqx carrier 2500/3000 filled sealed trailer (hub end) 75 (typ) empty sealed tape sizeabcdnw1w2 12 mm 13.0 0.059 0.512 0.795 7.008 0.488 0.724 (330) (1.50) (13.00) (20.20) (178) (12.4) (18.4)
www.fairchildsemi.com 10 74vcx2245 physical dimensions inches (millimeters) unless otherwise noted 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide package number m20b
11 www.fairchildsemi.com 74vcx2245 physical dimensions inches (millimeters) unless otherwise noted (continued) 20-terminal depopulated quad very-thin flat pack no leads (dqfn), jedec mo-241, 2.5 x 4.5mm package number mlp020b
www.fairchildsemi.com 12 74vcx2245 low voltage bidirectional transceiver with 3.6v tolerant inputs and outputs and 26 ? series resistors in b outputs physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide package number mtc20 fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and fairchild reserves the right at any time without notice to change said circuitry and specifications. life support policy fairchild ? s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. a critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com

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