? 2003 fairchild semiconductor corporation ds500198 www.fairchildsemi.com june 1999 revised august 2003 74vcxh245 low voltage bidirectional transceiver with bushold 74vcxh245 low voltage bidirectional transceiver with bushold general description the vcxh245 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 vcxh245 data inputs include active bushold circuitry, eliminating the need for external pull-up resistors to hold unused or float- ing data inputs at a valid logic level. the 74vcxh245 is designed for low voltage (1.2v to 3.6v) v cc applications. the 74vcxh245 is fabricated with an advanced cmos technology to achieve high-speed operation while main- taining low cmos power dissipation. features 1.2v to 3.6v v cc supply operation bushold on data inputs eliminates the need for external pull-up/pull-down resistors t pd 3.5 ns max for 3.0v to 3.6v v cc static drive (i oh /i ol ) 24 ma @ 3.0v v cc uses patented quiet series ? noise/emi reduction circuitry latchup performance exceeds 300 ma esd performance: human body model > 2000v machine model > 200v ordering code: devices also available in tape and reel. specify by appending the suffix letter ?x? to the ordering code. logic symbol pin descriptions quiet series ? is a trademark of fairchild semiconductor corporation. order number package number package description 74vcxh245wm m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74vcxh245mtc 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 bushold inputs or 3-state outputs b 0 ? b 7 side b bushold inputs or 3-state outputs
www.fairchildsemi.com 2 74vcxh245 connection diagram truth table h = high voltage level l = low voltage level x = immaterial z = high impedance 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
3 www.fairchildsemi.com 74vcxh245 absolute maximum ratings (note 1) recommended operating conditions (note 3) note 1: 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 2: i o absolute maximum rating must be observed. note 3: floating or unused control 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 2) ? 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 (i oh /i ol ) 50 ma dc v cc or ground current 100 ma storage temperature (t stg ) ? 65 c to + 150 c power supply operating 1.2v 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 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 v cc = 1.2v 100 a 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 1.2 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 1.2 0.05 x v cc v oh high level output voltage i oh = ? 100 a 2.7 - 3.6 v cc - 0.2 v 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 = ? 6 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 i oh = ? 100 a1.2v cc - 0.2
www.fairchildsemi.com 4 74vcxh245 dc electrical characteristics (continued) note 4: an external driver must source at least the specified current to switch from low-to-high. note 5: an external driver must sink at least the specified current to switch from high-to-low. symbol parameter conditions v cc min max units (v) v ol low level output voltage i ol = 100 a 2.7 - 3.6 0.2 v 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 i ol = 100 a1.20.05 i i input leakage current v in = v cc or gnd 1.2 - 3.6 5.0 a i i(hold) bushold input minimum v in = 0.8v 3.0 75.0 a drive hold current v in = 2.0v 3.0 ? 75.0 v in = 0.7v 2.3 45.0 v in = 1.6v 2.3 ? 45.0 v in = 0.57v 1.65 25.0 v in = 1.07v 1.65 ? 25.0 i i(od) bushold input over-drive (note 4) 3.6 450 a current to change state (note 5) 3.6 ? 450 (note 4) 2.7 300 (note 5) 2.7 ? 300 (note 4) 1.95 200 (note 5) 1.95 ? 200 i oz 3-state output leakage v o = v cc or gnd 1.2 - 3.6 10.0 a v i = v ih or v il i cc quiescent supply current v i = v cc or gnd 1.2 - 3.6 20.0 a ? i cc increase in i cc per input v ih = v cc ? 0.6v 2.7 - 3.6 750 a
5 www.fairchildsemi.com 74vcxh245 ac electrical characteristics (note 6) note 6: for c l = 50 pf, add approximately 300 ps to the ac maximum specification. note 7: 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 ). dynamic switching characteristics capacitance 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 a n to b n or 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 1.2 42.0 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 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 1.2 49.0 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 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 1.2 36.0 t oshl output to output skew c l = 30 pf, r l = 500 ? 3.3 0.3 0.5 ns t oslh (note 7) 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 1.2 1.5 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 2.5 0.7 3.3 1.0 v olv quiet output dynamic valley v ol c l = 30 pf, v ih = v cc , v il = 0v 1.8 ? 0.3 v 2.5 ? 0.7 3.3 ? 1.0 v ohv quiet output dynamic valley v oh c l = 30 pf, v ih = v cc , v il = 0v 1.8 1.3 v 2.5 1.7 3.3 2.0 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
www.fairchildsemi.com 6 74vcxh245 ac loading and waveforms (v cc 3.3v 0.3v to 1.8v 0.5v) 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
7 www.fairchildsemi.com 74vcxh245 ac loading and waveforms (v cc 1.5v 0.1v to 1.2v) 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 = 1.5 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
www.fairchildsemi.com 8 74vcxh245 physical dimensions inches (millimeters) unless otherwise noted 20-lead small outline integrated circuit, jedec ms-013, 0.300? wide body package number m20b
9 www.fairchildsemi.com 74vcxh245 low voltage bidirectional transceiver with bushold physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead thin shrink small outline package, 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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