industrial temperature range idt74lvc244a 3.3v cmos octal buffer/driver with 3-state outputs 1 october 2008 industrial temperature range the idt logo is a registered trademark of integrated device technology, inc. ? 1999 integrated device technology, inc. dsc-4614/3 features: ? 0.5 micron cmos technology ? esd > 2000v per mil-std-883, method 3015; > 200v using machine model (c = 200pf, r = 0) ?v cc = 3.3v 0.3v, normal range ?v cc = 2.7v to 3.6v, extended range ? cmos power levels (0.4 w typ. static) ? rail-to-rail output swing for increased noise margin ? all inputs, outputs, and i/o are 5v tolerant ? supports hot insertion ? available in soic, ssop, qsop, and tssop packages functional block diagram applications: ? 5v and 3.3v mixed voltage systems ? data communication and telecommunication systems drive features: ? high output drivers: 24ma ? reduced system switching noise idt74lvc244a description: the lvc244a device is organized as two 4-bit line drivers with separate output-enable ( oe ) inputs. when oe is low, the device passes data from the a inputs to the y outputs. when oe is high, the outputs are in the high- impedance state. the lvc244a has been designed with a 24ma output driver. this driver is capable of driving a moderate to heavy load while maintaining speed performance. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. inputs can be driven from either 3.3v or 5v devices. this feature allows the use of this device as a translator in a mixed 3.3v/5v system environment. 3.3v cmos octal buffer/driver with 3-state outputs, 5 volt tolerant i/o 1 a 1 1 a 2 1 a 3 1 a 4 1 y 1 1 y 2 1 y 3 1 y 4 2 a 1 2 a 2 2 a 3 2 a 4 2 y 1 2 oe 2 y 2 2 y 3 2 y 4 19 11 9 15 5 7 13 3 17 1 2 4 6 8 18 16 14 12 1 oe
industrial temperature range 2 idt74lvc244a 3.3v cmos octal buffer/driver with 3-state outputs pin configuration note: 1. as applicable to the device type. symbol parameter (1) conditions typ. max. unit c in input capacitance v in = 0v 4.5 6 pf c out output capacitance v out = 0v 5.5 8 pf c i/o i/o port capacitance v in = 0v 6.5 8 pf capacitance (t a = +25c, f = 1.0mhz) symbol description max unit v term terminal voltage with respect to gnd ?0.5 to +6.5 v t stg storage temperature ?65 to +150 c i out dc output current ?50 to +50 ma i ik continuous clamp current, ?50 ma i ok v i < 0 or v o < 0 i cc continuous current through each 100 ma i ss v cc or gnd absolute maximum ratings (1) note: 1. stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. soic/ ssop/ qsop/ tssop top view 2 3 1 1 a 1 v cc 16 15 14 2 a 3 1 y 2 1 y 3 1 y 1 2 a 4 11 1 y 4 2 a 2 2 a 1 19 18 20 17 13 12 1 oe 5 6 2 y 2 7 2 y 3 1 a 3 4 2 y 4 1 a 2 8 9 gnd 10 1 a 4 2 y 1 2 oe notes: 1. h = high voltage level x = don?t care l = low voltage level z = high-impedance inputs outputs x oe xax xyx lhh lll hxz function table (each buffer) (1) pin names description x a x data inputs x y x 3-state outputs x oe output enable inputs (active low) pin description
industrial temperature range idt74lvc244a 3.3v cmos octal buffer/driver with 3-state outputs 3 symbol parameter test conditions min. typ. (1) max. unit v ih input high voltage level v cc = 2.3v to 2.7v 1.7 ? ? v v cc = 2.7v to 3.6v 2 ? ? v il input low voltage level v cc = 2.3v to 2.7v ? ? 0.7 v v cc = 2.7v to 3.6v ? ? 0.8 i ih input leakage current v cc = 3.6v v i = 0 to 5.5v ? ? 5a i il i ozh high impedance output current v cc = 3.6v v o = 0 to 5.5v ? ? 10 a i ozl (3-state output pins) i off input/output power off leakage v cc = 0v, v in or v o 5.5v ? ? 50 a v ik clamp diode voltage v cc = 2.3v, i in = ?18ma ? ?0.7 ?1.2 v v h input hysteresis v cc = 3.3v ? 100 ? mv i ccl quiescent power supply current v cc = 3.6v v in = gnd or v cc ?? 10a i cch i ccz 3.6 v in 5.5v (2) ?? 10 i cc quiescent power supply current one input at v cc - 0.6v, other inputs at v cc or gnd ? ? 500 a variation dc electrical characteristics over operating range following conditions apply unless otherwise specified: operating condition: t a = ?40c to +85c notes: 1. typical values are at v cc = 3.3v, +25c ambient. 2. this applies in the disabled state only. note: 1. v ih and v il must be within the min. or max. range shown in the dc electrical characteristics over operating range table for the appropriat e v cc range. t a = ? 40c to + 85c. output drive characteristics symbol parameter test conditions (1) min. max. unit v oh output high voltage v cc = 2.3v to 3.6v i oh = ? 0.1ma v cc ? 0.2 ? v v cc = 2.3v i oh = ? 6ma 2 ? v cc = 2.3v i oh = ? 12ma 1.7 ? v cc = 2.7v 2.2 ? v cc = 3v 2.4 ? v cc = 3v i oh = ? 24ma 2.2 ? v ol output low voltage v cc = 2.3v to 3.6v i ol = 0.1ma ? 0.2 v v cc = 2.3v i ol = 6ma ? 0.4 i ol = 12ma ? 0.7 v cc = 2.7v i ol = 12ma ? 0.4 v cc = 3v i ol = 24ma ? 0.55
industrial temperature range 4 idt74lvc244a 3.3v cmos octal buffer/driver with 3-state outputs operating characteristics, v cc = 3.3v 0.3v, t a = 25c symbol parameter test conditions typical unit c pd power dissipation capacitance per buffer/driver outputs enabled c l = 0pf, f = 10mhz 44 pf c pd power dissipation capacitance per buffer/driver outputs disabled 2 switching characteristics (1) v cc = 2.7v v cc = 3.3v 0.3v symbol parameter min. max. min. max. unit t plh propagation delay ? 6.9 1.5 5.9 ns t phl xax to xyx t pzh output enable time ? 8.6 1.5 7.6 ns t pzl x oe to xyx t phz output disable time ? 6.8 1.5 6.5 ns t plz x oe to xyx t sk (o) output skew (2) ?? ? 500 ps notes: 1. see test circuits and waveforms. t a = ? 40c to + 85c. 2. skew between any two outputs of the same package and switching in the same direction.
industrial temperature range idt74lvc244a 3.3v cmos octal buffer/driver with 3-state outputs 5 open v load gnd v cc pulse generator d.u.t. 500 500 c l r t v in v out (1, 2) lvc link input v ih 0v v oh v ol t plh1 t sk (x) output 1 output 2 t phl1 t sk (x) t plh2 t phl2 v t v t v oh v t v ol t sk (x) = t plh2 - t plh1 or t phl2 - t phl1 lvc link same phase input transition opposite phase input transition 0v 0v v oh v ol t plh t phl t phl t plh output v ih v t v t v ih v t lvc link data input 0v 0v 0v 0v t rem timing input asynchronous control synchronous control t su t h t su t h v ih v t v ih v t v ih v t v ih v t lvc link low-high-low pulse high-low-high pulse v t t w v t lvc link control input t plz 0v output normally low t pzh 0v switch v load output normally high enable disable switch gnd t phz 0v v ol+ v lz v oh v t v t t pzl v load/2 v load/2 v ih v t v ol v oh- v hz lvc link test circuits and waveforms propagation delay test circuit for all outputs enable and disable times set-up, hold, and release times notes: 1. for t sk (o) output1 and output2 are any two outputs. 2. for t sk (b) output1 and output2 are in the same bank. definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. notes: 1. pulse generator for all pulses: rate 10mhz; t f 2.5ns; t r 2.5ns. 2. pulse generator for all pulses: rate 10mhz; t f 2ns; t r 2ns. output skew - t sk ( x ) pulse width note: 1. diagram shown for input control enable-low and input control disable-high. symbol v cc (1) = 3.3v0.3v v cc (1) = 2.7v v cc (2) = 2.5v0.2v unit v load 6 6 2 x vcc v v ih 2.7 2.7 vcc v v t 1.5 1.5 vcc / 2 v v lz 300 300 150 mv v hz 300 300 150 mv c l 50 50 30 pf test conditions switch position test switch open drain disable low v load enable low disable high gnd enable high all other tests open
industrial temperature range 6 idt74lvc244a 3.3v cmos octal buffer/driver with 3-state outputs ordering information xx lvc xxxx xx package device type temp. range so sog py pyg q qg pg pgg 74 small outline ic (gull wing) soic - green shrink small outline package ssop - green quarter size small outline package qsop - green thin shrink small outline package tssop - green octal buffer/driver with 3-state outputs, 24ma ?40c to +85c x bus-hold 244a no bus-hold blank corporate headquarters for sales: for tech support: 6024 silver creek valley road 800-345-7015 or 408-284-8200 logichelp@idt.com san jose, ca 95138 fax: 408-284-2775 www.idt.com
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