? 1999 fairchild semiconductor corporation ds009966 www.fairchildsemi.com november 1988 revised november 1999 74ac540 octal buffer/line driver with 3-state outputs 74ac540 octal buffer/line driver with 3-state outputs general description the ac540 is an octal buffer/line drivers designed to be employed as memory and address drivers, clock drivers and bus oriented transmitter/receivers. these devices are similar in function to the ac240 while providing flow-through architecture (inputs on opposite side from outputs). this pinout arrangement makes these devices especially useful as output ports for microproces- sors, allowing ease of layout and greater pc board density. features i cc and i oz reduced by 50% 3-state inverting outputs inputs and outputs opposite side of package, allowing easier interface to microprocessors output source/sink 24 ma ordering code: device also available in tape and reel. specify by appending suffix letter ?x? to the ordering code. logic symbol ieee/iec connection diagram truth table h = high voltage level x = immaterial l = low voltage level z = high impedance fact ? is a trademark of fairchild semiconductor corporation. order number package number package description 74ac540sc m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300 ? wide body 74ac540sj m20d 20-lead small outline package (sop), eiaj type ii, 5.3mm wide 74ac540mtc mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide 74ac540pc n20a 20-lead plastic dual-in-line package (pdip), jedec ms-001, 0.300 ? wide inputs outputs oe 1 oe 2 i llh l hxx z xhx z lll h
www.fairchildsemi.com 2 74ac540 absolute maximum ratings (note 1) recommended operating conditions note 1: absolute maximum ratings are those values beyond which damage to the device may occur. the databook specifications should be met, with- out exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. fairchild does not recommend operation of fact ? circuits outside databook specifications. dc electrical characteristics note 2: all outputs loaded; thresholds on input associated with output under test. note 3: maximum test duration 2.0 ms, one output loaded at a time. note 4: i in and i cc @ 3.0v are guaranteed to be less than or equal to the respective limit @ 5.5v v cc . supply voltage (v cc ) ? 0.5v to + 7.0v dc input diode current (i ik ) v i = ? 0.5v ? 20 ma v i = v cc + 0.5v + 20 ma dc input voltage (v i ) ? 0.5v to v cc + 0.5v dc output diode current (i ok ) v o = ? 0.5v ? 20 ma v o = v cc + 0.5v + 20 ma dc output voltage (v o ) ? 0.5v to v cc + 0.5v dc output source or sink current (i o ) 50 ma dc v cc or ground current per output pin (i cc or i gnd ) 50 ma storage temperature (t stg ) ? 65 c to + 150 c junction temperature (t j ) pdip 140 c supply voltage (v cc ) 2.0v to 6.0v input voltage (v i ) 0v to v cc output voltage (v o ) 0v to v cc operating temperature (t a ) ? 40 c to + 85 c minimum input edge rate ( ? v/ ? t) 125 mv/ns v in from 30% to 70% of v cc v cc @ 3.3v, 4.5v, 5.5v symbol parameter v cc t a = + 25 ct a = ? 40 c to + 85 c units conditions (v) typ guaranteed limits v ih minimum high level 3.0 1.5 2.1 2.1 v out = 0.1v input voltage 4.5 2.25 3.15 3.15 v or v cc ? 0.1v 5.5 2.75 3.85 3.85 v il maximum low level 3.0 1.5 0.9 0.9 v out = 0.1v input voltage 4.5 2.25 1.35 1.35 v or v cc ? 0.1v 5.5 2.75 1.65 1.65 v oh minimum high level 3.0 2.99 2.9 2.9 output voltage 4.5 4.49 4.4 4.4 v i out = ? 50 a 5.5 5.49 5.4 5.4 v in = v il or v ih 3.0 2.56 2.46 i oh = ? 12 ma 4.5 3.86 3.76 v i oh = ? 24 ma 5.5 4.86 4.76 i oh = ? 24 ma (note 2) v ol maximum low level 3.0 0.002 0.1 0.1 output voltage 4.5 0.001 0.1 0.1 v i out = 50 a 5.5 0.001 0.1 0.1 v in = v il or v ih 3.0 0.36 0.44 i ol = 12 ma 4.5 0.36 0.44 v i ol = 24 ma 5.5 0.36 0.44 i ol = 24 ma (note 2) i in maximum input 5.5 0.1 1.0 av i = v cc , gnd (note 4) leakage current i oz maximum 3-state v i (oe) = v il , v ih current 5.5 0.25 2.5 av i = v cc , gnd v o = v cc , gnd i old minimum dynamic 5.5 75 ma v old = 1.65v max i ohd output current (note 3) 5.5 ? 75 ma v ohd = 3.85v min i cc maximum quiescent 5.5 4.0 40.0 a v in = v cc (note 4) supply current or gnd
3 www.fairchildsemi.com 74ac540 ac electrical characteristics note 5: voltage range 3.3 is 3.3v 0.3v voltage range 5.0 is 5.0v 0.5v capacitance v cc t a = + 25 ct a = ? 40 c to + 85 c symbol parameter (v) c l = 50 pf c l = 50 pf units (note 5) min typ max min max t plh propagation delay 3.3 1.5 5.5 7.5 1.0 8.0 ns data to output 5.0 1.5 4.0 6.0 1.0 6.5 t phl propagation delay 3.3 1.5 5.0 7.0 1.0 7.5 ns data to output 5.0 1.5 4.0 5.5 1.0 6.0 t pzh output enable time 3.3 3.0 8.5 11.0 2.5 12.0 ns 5.0 2.0 6.5 8.5 2.0 9.5 t pzl output enable time 3.3 2.5 7.5 10.0 2.0 11.0 ns 5.0 2.0 6.0 7.5 1.5 8.5 t phz output disable time 3.3 2.5 8.5 13.0 1.5 14.0 ns 5.0 1.5 7.5 10.5 1.0 11.0 t plz output disable time 3.3 2.5 7.0 10.0 2.0 11.0 ns 5.0 1.5 6.0 8.0 1.5 9.0 symbol parameter typ units conditions c in input capacitance 4.5 pf v cc = open c pd power dissipation capacitance 30.0 pf v cc = 5.0v
www.fairchildsemi.com 4 74ac540 physical dimensions inches (millimeters) unless otherwise noted 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300? wide body package number m20b
5 www.fairchildsemi.com 74ac540 physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead small outline package (sop), eiaj type ii, 5.3mm wide package number m20d
www.fairchildsemi.com 6 74ac540 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
7 www.fairchildsemi.com 74ac540 octal buffer/line driver with 3-state outputs physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead plastic dual-in-line package (pdip), jedec ms-001, 0.300 ? wide package number n20a 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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