? 2001 fairchild semiconductor corporation ds500647 www.fairchildsemi.com september 2001 revised september 2001 74alvc245 low voltage bidirectional transceiver with 3.6v tolerant inputs and outputs 74alvc245 low voltage bidirectional transceiver with 3.6v tolerant inputs and outputs general description the alvc245 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 74alvc245 is designed for low voltage (1.65v to 3.6v) v cc applications with i/o compatibility up to 3.6v. the 74alvc245 is fabricated with an advanced cmos technology to achieve high-speed operation while main- taining low cmos power dissipation. features 1.65v-3.6v v cc supply operation 3.6v tolerant inputs and outputs power-off high impedance inputs and outputs supports live insertion and withdrawal (note 1) t pd 3.4 ns max for 3.0v to 3.6v v cc 3.9 ns max for 2.3v to 2.7v v cc 6 ns max for 1.65v to 1.95v v cc uses patented quiet series ? noise/emi reduction circuitry latchup conforms to jedec jed78 esd performance: human body model > 2000v machine model > 200v 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. logic symbol pin descriptions quiet series ? is a trademark of fairchild semiconductor corporation. order number package number package description 74alvc245wm m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74alvc245mtc 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 74alvc245 connection diagram truth table h = high voltage level l = low voltage level x = immaterial z = high impedance note 2: unused bus terminals during high z state must be held high or low. logic diagram inputs outputs oe t/r llbus b 0 ? b 7 data to bus a 0 ? a 7 lhbus 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 2)
3 www.fairchildsemi.com 74alvc245 absolute maximum ratings (note 3) recommended operating conditions (note 5) note 3: 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 4: i o absolute maximum rating must be observed, limited to 4.6v. note 5: 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 output voltage (v o ) (note 4) ? 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 dc output source/sink current (i oh /i ol ) 50 ma dc v cc or gnd current per supply pin (i cc or gnd) 100 ma storage temperature range (t stg ) ? 65 c to + 150 c power supply operating 1.65v to 3.6v input voltage (v i )0v to v cc output voltage (v o )0v to v cc 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 1.65 - 1.95 0.65 x v cc v 2.3 - 2.7 1.7 2.7 - 3.6 2.0 v il low level input voltage 1.65 - 1.95 0.35 x v cc v 2.3 - 2.7 0.7 2.7 - 3.6 0.8 v oh high level output voltage i oh = ? 100 a 1.65 - 3.6 v cc - 0.2 v i oh = ? 4 ma 1.65 1.2 i oh = ? 6 ma 2.3 2.0 i oh = ? 12 ma 2.3 1.7 2.7 2.2 3.0 2.4 i oh = ? 24 ma 3.0 2 v ol low level output voltage i ol = 100 a 1.65 - 3.6 0.2 v i ol = 4 ma 1.65 0.45 i ol = 6 ma 2.3 0.4 i ol = 12 ma 2.3 0.7 2.7 0.4 i ol = 24 ma 3.0 0.55 i oh high level output current 1.65 ? 4 ma 2.3 ? 12 2.7 ? 12 3.0 ? 24 i ol low level output current 1.65 4 ma 2.3 12 2.7 12 324 i i input leakage current 0 v i 3.6v 3.6 5.0 a i oz 3-state output leakage 0 v o 3.6v 3.6 10 a i cc quiescent supply current v i = v cc or gnd, i o = 0 3.6 10 a ? i cc increase in i cc per input v ih = v cc ? 0.6v 3 - 3.6 750 a
www.fairchildsemi.com 4 74alvc245 ac electrical characteristics capacitance symbol parameter t a = ? 40 c to + 85 c, r l = 500 ? units c l = 50 pf c l = 30 pf v cc = 3.3v 0.3v v cc = 2.7v v cc = 2.5v 0.2v v cc = 1.8v 0.15v min max min max min max min max t phl , t plh propagation delay 1.3 3.4 3.9 1.0 3.5 1.5 6.0 ns t pzl , t pzh output enable time 1.6 5.5 6.3 2.0 6.0 2.7 8.6 ns t plz , t phz output disable time 1.7 5.5 5.3 0.8 4.8 1.5 8.0 ns symbol parameter conditions t a = + 25 c units v cc typical c in input capacitance control v i = 0v or v cc 3.3 3 pf c i/o input/ output capacitance a or b ports v i = 0v or v cc 3.3 6 c pd power dissipation capacitance outputs enabled f = 10 mhz, c l = 0 pf 3.3 30 pf 2.5 27 1.8 25 outputs disabled f = 10 mhz, c l = 0 pf 3.3 0 2.5 0 1.8 0
5 www.fairchildsemi.com 74alvc245 ac loading and waveforms figure 1. ac test circuit figure 2. waveform for inverting and non-inverting functions figure 3. 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 = 2.5 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 6 74alvc245 physical dimensions inches (millimeters) unless otherwise noted 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide package number m20b
7 www.fairchildsemi.com 74alvc245 low voltage bidirectional transceiver with 3.6v tolerant inputs and 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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