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? 2005 fairchild semiconductor corporation ds012404 www.fairchildsemi.com march 1995 revised march 2005 74lcx541 low voltage octal buffer/line driver with 5v tolerant inputs and outputs 74lcx541 low voltage octal buffer/line driver with 5v tolerant inputs and outputs general description the lcx541 is an octal buffer/line driver designed to be employed as memory and address drivers, clock drivers and bus oriented transmitter/receivers. the lcx541 is a non inverting option of the lcx540. this device is similar in function to the lcx244 while pro- viding flow-through architecture (inputs on opposite side from outputs). this pinout arrangement makes this device especially useful as an output port for microprocessors, allowing ease of layout and greater pc board density. the lcx541 is designed for low voltage (2.5v or 3.3v) v cc applications with capability of interfacing to a 5v signal environment. the lcx541 is fabricated with an advanced cmos technology to achieve high speed operation while maintaining cmos low power dissipation. features 5v tolerant input and outputs 2.3v?3.6v v cc specifications provided 6.5 ns t pd max (v cc 3.3v), 10 p a i cc max power-down high impedance inputs and outputs supports live insertion/withdrawal (note 1) r 24 ma output drive (v cc 3.0v) implements patented noise/ emi reduction circuitry latch-up performance exceeds jedec 78 conditions esd performance: human body model ! 2000v machine model ! 200v leadless pb-free 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. ordering code: devices also available in tape and reel. specify by appending the suffix letter ? x ? to the ordering code. pb-free package per jeded j-std-020b. note 2: dqfn package available in tape and reel only. note 3: ? _nl ? indicates pb-free package (per jedec j-std-020b). device available in tape and reel only. order number package package description number 74lcx541wm m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74lcx541sj m20d pb-free 20-lead small outline package (sop), eiaj type ii, 5.3mm wide 74LCX541BQX (preliminary) (note 2) mlp020b pb-free 20-terminal depopulated quad very-thin flat pack no leads (dqfn), jedec mo-241, 2.5 x 4.5mm 74lcx541msa msa20 20-lead shrink small outline package (ssop), jedec mo-150, 5.3mm wide 74lcx541mtc mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide 74lcx541mtc_nl (note 3) mtc20 pb-free 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide
www.fairchildsemi.com 2 74lcx541 connection diagrams pin assignments for soic, sop, ssop, tssop pad assignment for dqfn (top view) logic symbol ieee/iec pin descriptions truth table h high voltage level l low voltage level x immaterial z high impedance pin names description oe 1 , oe 2 3-state output enable inputs i 0 , i 7 inputs o 0 , o 7 outputs inputs outputs oe 1 oe 2 io n llhh hxxz xhxz llll
3 www.fairchildsemi.com 74lcx541 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 maxi mum ratings. the ? recom- mended operating conditions ? table will define the conditions for actual device operation. note 5: i o absolute maximum rating must be observed. note 6: unused inputs or i/o's must be held high or low. they may not float. dc electrical characteristics symbol parameter value conditions units v cc supply voltage 0.5 to 7.0 v v i dc input voltage 0.5 to 7.0 v v o dc output voltage 0.5 to 7.0 output in 3-state v 0.5 to v cc 0.5 output in high or low state (note 5) i ik dc input diode current 50 v i gnd ma i ok dc output diode current 50 v o gnd ma 50 v o ! v cc i o dc output source/sink current r 50 ma i cc dc supply current per supply pin r 100 ma i gnd dc ground current per ground pin r 100 ma t stg storage temperature 65 to 150 q c 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 05.5v v o output voltage high or low state 0 v cc v 3-state 0 5.5 i oh /i ol output current v cc 3.0v 3.6v r 24 ma v cc 2.7v 3.0v r 12 v cc 2.3v 2.7v r 8 t a free-air operating temperature 40 85 q c ' t/ ' v input edge rate, v in 0.8v ? 2.0v, v cc 3.0v 0 10 ns/v symbol parameter conditions v cc t a 40 q c to 85 q c units (v) min max v ih high level input voltage 2.3 2.7 1.7 v 2.7 3.6 2.0 v il low level input voltage 2.3 2.7 0.7 v 2.7 3.6 0.8 v oh high level output voltage i oh 100 p a2.3 3.6 v cc - 0.2 v i oh = -8 ma 2.3 1.8 i oh 12 ma 2.7 2.2 i oh 18 ma 3.0 2.4 i oh 24 ma 3.0 2.2 v ol low level output voltage i ol 100 p a2.3 3.6 0.2 i ol = 8ma 2.3 0.6 i ol 12 ma 2.7 0.4 v i ol 16 ma 3.0 0.4 i ol 24 ma 3.0 0.55 i i input leakage current 0 d v i d 5.5v 2.3 3.6 r 5.0 p a i off power-off leakage current v i or v o 5.5v 0 10 p a i cc quiescent supply current v i v cc or gnd 2.3 3.6 10 p a 3.6v d v i , v o d 5.5v (note 7) 2.3 3.6 r 10 ' i cc increase in i cc per input v ih v cc 0.6v 2.3 3.6 500 p a
www.fairchildsemi.com 4 74lcx541 dc electrical characteristics (continued) note 7: outputs disabled or 3-state only. ac electrical characteristics note 8: 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 t a 40 q c to 85 q c, r l 500 : units v cc 3.3v r 0.3v v cc 2.7v v cc 2.5v r 0.2v c l 50 pf c l 50 pf c l 30 pf min max min max min max t phl propagation delay 1.5 6.5 1.5 7.5 1.5 7.8 ns t plh 1.56.51.57.51.57.8 t pzl output enable time 1.5 8.5 1.5 9.5 1.5 10.5 ns t pzh 1.58.51.59.51.510.5 t plz output disable time 1.5 7.5 1.5 8.5 1.5 9.0 ns t phz 1.57.51.58.51.59.0 t oshl output to output skew (note 8) 1.0 ns t oslh 1.0 symbol parameter conditions v cc t a 25 q c units (v) typical v olp quiet output dynamic peak v ol c l 50 pf, v ih 3.3v, v il 0v 3.3 0.8 v c l 30 pf, v ih 2.5v, v il 0v 2.5 0.6 v olv quiet output dynamic valley v ol c l 50 pf, v ih 3.3v, v il 0v 3.3 0.8 v c l 30 pf, v ih 2.5v, v il 0v 2.5 0.6 symbol parameter conditions typical units c in input capacitance v cc open, v i 0v or v cc 7pf c out output capacitance v cc 3.3v, v i 0v or v cc 8pf c pd power dissipation capacitance v cc 3.3v, v i 0v or v cc , f 10 mhz 25 pf
5 www.fairchildsemi.com 74lcx541 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 high enable and disable times for logic 3-state output low enable and disable times for logic setup time, hold time and recovery time for logic t rise and t fall figure 2. waveforms (input pulse characteristics; f = 1mhz, t r = t f = 3ns) test switch t plh , t phl open t pzl , t plz 6v at v cc 3.3 r 0.3v v cc x 2 at v cc 2.5 r 0.2v t pzh ,t phz gnd symbol v cc 3.3v r 0.3v 2.7v 2.5v r 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
www.fairchildsemi.com 6 74lcx541 schematic diagram generic for lcx family
7 www.fairchildsemi.com 74lcx541 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 3000 filled sealed trailer (hub end) 75 (typ) empty sealed tape sizeabcdnw1w2 12 mm 13.0 0.059 0.512 0.795 2.165 0.488 0.724 (330.0) (1.50) (13.00) (20.20) (55.00) (12.4) (18.4)
www.fairchildsemi.com 8 74lcx541 physical dimensions inches (millimeters) unless otherwise noted 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide package number m20b
9 www.fairchildsemi.com 74lcx541 physical dimensions inches (millimeters) unless otherwise noted (continued) pb-free 20-lead small outline package (sop), eiaj type ii, 5.3mm wide package number m20d
www.fairchildsemi.com 10 74lcx541 physical dimensions inches (millimeters) unless otherwise noted (continued) pb-free 20-terminal depopulated quad very-thin flat pack no leads (dqfn), jedec mo-241, 2.5 x 4.5mm package number mlp020b
11 www.fairchildsemi.com 74lcx541 physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead shrink small outline package (ssop), jedec mo-150, 5.3mm wide package number msa20
www.fairchildsemi.com 12 74lcx541 low voltage octal buffer/line driver with 5v 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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