tc74lcxza244ft/fk 2014-03-01 1 toshiba cmos digital integrat ed ci rcuit silicon monolithic tc74lcxza244ft, TC74LCXZA244FK low voltage octal bus buffer wit h 5 v tolerant inputs and outputs the tc74lcxza244 is a high-performance cmos octal bus buffer. designed for use in 2.5-v systems, it achieves high-speed operation while maintaining th e cmos low power dissipation. the device is designed for low-voltage (2.5 v) v cc applications, but it could be used to interface to 5 v supply environment for both inputs and outputs. when power supply voltage is turned on, turned off or v cc is between 0 to 1.5v, output will be at high impedance. for operation at (2.5 v) v cc , hot board insertion is applicable. the tc74lcxza244 is a non-inverting 3-state buffer having two active-low output enables. this device is designed to be used with 3-state memory a ddress drivers, etc. all inputs are equipped with prot ection circuits against static discharge. features ? low-voltage operation: v cc = 2.3 to 2.7 v ? high-speed operation: tpd = 7.0 ns (max) (v cc = 2.3 to 2.7 v) ? output current: i oh = ? 12 ma (min) / i ol = 18 ma (min) (v cc = 2.3v) ? available in tssop and vssop (us) ? power-down protection provided on all inputs and outputs ? pin and function compatible with the 74 series (74ac/vhc/hc/f/als/ls etc.) 244 type tc74lcxza244ft TC74LCXZA244FK weight tssop20-p-0044-0.65a : 0.08 g ( typ.) vssop20-p-0030-0.50 : 0.03 g ( typ.) start of commercial production 2011-03
tc74lcxza244ft/fk 2014-03-01 2 pin assignment (top view) iec logic symbol truth table inputs oe an outputs l l l l h h h x z x: don?t care z: high impedance v cc 20 oe2 1y1 2a4 1y2 2a3 19 18 17 16 15 14 oe1 1 2 3 4 5 6 7 1a1 2y4 1a2 2y3 1a3 2y2 1y3 8 9 10 1a4 2y1 gnd 13 12 11 2a2 1y4 2a1 1 2 4 6 8 19 11 13 15 17 18 16 14 12 en en 9 7 5 3 1a1 1a2 1a3 1a4 2a1 2a2 2a3 2a4 oe1 oe2 1y1 1y2 1y3 1y4 2y1 2y2 2y3 2y4
tc74lcxza244ft/fk 2014-03-01 3 absolute maximum ratings (note1) characteristics symbol rating unit power supply voltage v cc ? 0.5 to 7.0 v dc input voltage v in ? 0.5 to 7.0 v ? 0.5 to 7.0 (note 2) dc output voltage v out ? 0.5 to v cc + 0.5 (note 3) v input diode current i ik ? 50 ma output diode current i ok 50 (note 4) ma dc output current i out 50 ma power dissipation p d 180 mw dc v cc /ground current i cc /i gnd 100 ma storage temperature t stg ? 65 to 150 c note 1: exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in ic performance or even destruction. using continuously under heavy loads (e.g. the app lication of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temper ature/current/voltage, etc. ) are within the absolute maximum ratings and the operating ranges. please design the appropriate reliability upon reviewing the toshiba semiconductor reliability handbook (?handling precautions?/?derating concept and methods?) and individual reliability data (i.e. reliability test report and estimated failure rate, etc). note 2: output in off-state note 3: high or low state. i out absolute maximum rating must be observed. note 4: v out < gnd, v out > v cc operating ranges (note1) characteristics symbol rating unit power supply voltage v cc 2.3 to 2.7 v input voltage v in 0 to 5.5 v 0 to 5.5 (note 2) output voltage v out 0 to v cc (note 3) v output current i oh /i ol ? 18/24 (note 4) ma operating temperature t opr ? 40 to 85 c input rise and fall time dt/dv 0 to 10 (note 5) ns/v power-up ramp rate dt/dv cc 150 (min) s/v note 1: the operating ranges must be maintai ned to ensure the normal op eration of the device. unused inputs must be tied to either v cc or gnd. note 2: output in off-state note 3: high or low state. note 4: v cc = 2.3 to 2.7 v note 5: v in = 0.7 to 1.7 v, v cc = 2.5 v
tc74lcxza244ft/fk 2014-03-01 4 electrical characteristics dc characteristics (ta = ? 40 to 85c) characteristics symbol test condition v cc (v) min max unit h-level v ih ? 2.3 to 2.7 1.7 ? input voltage l-level v il ? 2.3 to 2.7 ? 0.7 v i oh = ? 100 a 2.3 to 2.7 v cc ? 0.2 ? i oh = ? 8 ma 2.3 1.8 ? h-level v oh v in = v ih or v il i oh = ? 12 ma 2.3 1.7 ? i ol = 100 a 2.3 to 2.7 ? 0.2 output voltage l-level v ol v in = v ih or v il i ol = 18 ma 2.3 ? 0.55 v input leakage current i in v in = 0 to 5.5 v 2.3 to 2.7 ? 5.0 a i oz v in = v ih or v il v out = 0 to 5.5 v 2.3 to 2.7 ? 5.0 a 3-state output off-state current i ozpu i ozpd output enable=don?t care v out = 0.5 to 5.5 v 0 to 1.2 ? 5.0 a power off leakage current i off v in /v out = 5.5 v 0 ? 10.0 a v in = v cc or gnd 2.3 to 2.7 ? 40 quiescent supply current i cc v in /v out = 2.7 to 5.5 v 2.3 to 2.7 ? 40 a
tc74lcxza244ft/fk 2014-03-01 5 ac characteristics (ta = ? 40 to 85c) characteristics symbol test condition v cc (v) min max unit propagation delay time t plh t phl figure 1, figure 2 2.5 0.2 1.5 7.0 ns output enable time t pzl t pzh figure 1, figure 3 2.5 0.2 1.5 8.6 ns output disable time t plz t phz figure 1, figure 3 2.5 0.2 1.5 7.8 ns output to output skew t oslh t oshl (note1) 2.5 0.2 ? 1.0 ns note1: parameter guaranteed by design. (t oslh = |t plhm ? t plhn |, t oshl = |t phlm ? t phln |) dynamic switching characteristics (ta = 25c, input: t r = t f = 2.5 ns, c l = 30 pf, r l = 500 ) characteristics symbol test condition v cc (v) typ. unit quiet output maximum dynamic v ol v olp v ih = 2.5 v, v il = 0 v 2.5 0.6 v quiet output minimum dynamic v ol |v olv | v ih = 2.5 v, v il = 0 v 2.5 0.6 v capacitive characteristics (ta = 25c) characteristics symbol test condition v cc (v) typ. unit input capacitance c in ? 2.5 5 pf output capacitance c out ? 2.5 7 pf power dissipation capacitance c pd f in = 10 mhz (note) 2.5 18 pf note: c pd is defined as the value of the internal equivalent capacitance which is ca lculated from the operating current consumption. average operating current can be obtained by the equation: i cc (opr) = c pd ?v cc ?f in + i cc /8 (per bit)
tc74lcxza244ft/fk 2014-03-01 6 ac test circuit ac waveform open v cc x2 gnd switch output measure r l = 500 c l = 30 pf parameter switch t plh , t phl open t plz , t pzl v cc x 2 t phz , t pzh gnd r l r l c l figure 1 figure 3 t plz , t phz , t pzl , t pzh 90% 10% v ol v cc gnd v cc v cc /2 t phz t pzh t r 2.5 ns t f 2.5 ns v cc /2 gnd v oh outputs enabled v cc /2 t plz t pzl v ol + 0.15 v v oh ? 0.15v outputs disabled outputs enabled output enable ( oe ) output (y) low to off to low output (y) high to off to high 90% 10% output (y) input (a) v ol v oh gnd v cc v cc /2 t plh t phl t r 2.5 ns t f 2.5 ns v cc /2 figure 2 t plh , t phl
tc74lcxza244ft/fk 2014-03-01 7 package dimensions weight: 0.08 g (typ.)
tc74lcxza244ft/fk 2014-03-01 8 package dimensions weight: 0.03 g (typ.)
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