tc74vhct240,244af/aft/afk 2008-12-01 1 toshiba cmos digital integrated ci rcuit silicon monolithic tc74vhct240af,tc74vhct240aft,tc74vhct240afk TC74VHCT244AF,TC74VHCT244AFt,TC74VHCT244AFk octal bus buffer tc74vhct240af/aft/afk inverted, 3-state outputs TC74VHCT244AF/aft/afk non-inverted, 3-state outputs the tc74vhct240a and 244a are advanced high speed cmos octal bus buffers fabricated with silicon gate c 2 mos technology. they achieve the high speed operation similar to equivalent bipolar schottky ttl while maintaining the cmos low power dissipation. the tc74vhct240a is an inverting 3-state buffer having two active-low output enables. the tc74vhct244a is a non-inverting 3-state buffer, and has two active-low output enables. these devices are designed to be used with 3-state memory address drivers, etc. the input voltage are compatible with ttl output voltage. these devices may be used as a level converter for interfacing 3.3 v to 5 v system. input protection and output circu it ensure that 0 to 5.5 v can be applied to the input and output (note) pins without regard to the supply voltage. these structur e prevents device destruction due to mismatched supply and in put/output voltages such as battery back up, hot board insertion, etc. note: output in off-state features ? high speed: t pd = 6.1 ns (typ.) at v cc = 5 v ? low power dissipation: i cc = 4 a (max) at ta = 25c ? compatible with ttl inputs: v il = 0.8 v (max) v ih = 2.0 v (min) ? power down protection is provid ed on all inputs and outputs ? balanced propagation delays: t plh ? t phl ? low noise: v olp = 1.0 v (max) ? pin and function compatible with the 74 series (74ac/hc/f/als/ls etc.) 240/244 type. tc74vhct240af, TC74VHCT244AF tc74vhct240aft, TC74VHCT244AFt tc74vhct240afk, TC74VHCT244AFk weight sop20-p-300-1.27a: 0.22 g (typ.) tssop20-p-0044-0.65a: 0.08 g (typ.) vssop20-p-0030-0.50: 0.03 g (typ.)
tc74vhct240,244af/aft/afk 2008-12-01 2 pin assignment iec logic symbol truth table inputs outputs g an yn n y l l l h l h h l h x z z x: don?t care z: high impedance yn: tc74vhct244a n y : tc74vhct240a v cc 16 2a4 2y1 2a3 15 14 13 12 11 20 1 2 3 4 5 6 7 1a3 2y 2 1a4 1y 2 1a1 3y1 8 1y1 19 2a2 g2 1a2 3y 2 18 9 4y 2 gnd 10 2a1 17 4y1 (top view) tc74vhct240a g 1 v cc 16 2a4 15 14 13 12 11 20 1 2 3 4 5 6 7 2y2 1a4 1y3 8 1y1 19 2a2 g2 1a2 18 9 2y4 gnd 10 2a1 17 1y4 (top view) tc74vhct244a 1y2 2a3 2y1 1a3 2y3 1a1 g1 (1) (2) (6) (4) 1a2 1a4 1a3 (8) (18) (14) 2y1 4y1 (16) (12) 3y1 en g1 1y1 1a1 tc74vhct240a (19) (11) (15) (13) 2a2 2a4 2a3 (17) (9) (5) 2y2 4y2 (7) (3) 3y2 en g2 1y2 2a1 (1) (2) (6) (4) 1a2 1a4 1a3 (8) (18) (14) 1y2 1y4 (16) (12) 1y3 en g1 1y1 1a1 tc74vhct244a (19) (11) (15) (13) 2a2 2a4 2a3 (17) (9) (5) 2y2 2y4 (7) (3) 2y3 en g2 2y1 2a1
tc74vhct240,244af/aft/afk 2008-12-01 3 absolute maximum ratings (note 1) characteristics symbol rating unit supply voltage range 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 ? 20 ma output diode current i ok 20 (note 4) ma dc output current i out 25 ma dc v cc /ground current i cc 75 ma power dissipation p d 180 mw 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 (note 1) characteristics symbol rating unit supply voltage v cc 4.5 to 5.5 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 operating temperature t opr ? 40 to 85 c input rise and fall time dt/dv 0 to 20 ns/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
tc74vhct240,244af/aft/afk 2008-12-01 4 electrical characteristics dc characteristics test condition ta 25c ta 40 to 85c characteristics symbol v cc (v) min typ. max min max unit high-level input voltage v ih 4.5 to 5.5 2.0 2.0 v low-level input voltage v il 4.5 to 5.5 0.8 0.8 v i oh 50 p a 4.5 4.40 4.50 4.40 high-level output voltage v oh v in v ih or v il i oh 8 ma 4.5 3.94 3.80 v i ol 50 p a 4.5 0.0 0.10 0.10 low-level output voltage v ol v in v ih or v il i ol 8 ma 4.5 0.36 0.44 v 3-state output off-state current i oz v in v ih or v il v out v cc or gnd 5.5 r 0.25 r 2.50 p a input leakage current i in v in 5.5 v or gnd 0 to 5.5 r 0.1 r 1.0 p a i cc v in v cc or gnd 5.5 4.0 40.0 p a quiescent supply current i cct per input: v in 3.4 v other input: v cc or gnd 5.5 1.35 1.50 ma output leakage current i opd v out 5.5 v 0 0.5 5.0 p a
tc74vhct240,244af/aft/afk 2008-12-01 5 ac characteristics (input: t r = t f = 3 ns) test condition ta = 25c ta = ? 40 to 85c characteristics symbol v cc (v) c l (pf) min typ. max min max unit 15 ? 5.6 7.8 1.0 9.0 propagation delay time (tc74vhct240a) t plh t phl ? 5.0 0.5 50 ? 6.1 8.8 1.0 10.0 ns 15 ? 5.4 7.4 1.0 8.5 propagation delay time (tc74vhct244a) t plh t phl ? 5.0 0.5 50 ? 5.9 8.4 1.0 9.5 ns 15 ? 7.7 10.4 1.0 12.0 3-state output enable time t pzl t pzh r l = 1 k 5.0 0.5 50 ? 8.2 11.4 1.0 13.0 ns 3-state output disable time t plz t phz r l = 1 k 5.0 0.5 50 ? 8.8 11.4 1.0 13.0 ns output to output skew t oslh t oshl (note 1) 5.0 0.5 50 ? ? 1.0 ? 1.0 ns input capacitance c in ? ? 4 10 ? 10 pf output capacitance c out ? ? 9 ? ? ? pf tc74vhct240a ? 19 ? ? ? power dissipation capacitance (note 2) c pd tc74vhct244a ? 18 ? ? ? pf note 1: parameter guaranteed by design. t oslh = |t plhm ? t plhn |, t oshl = |t phlm ? t phln | note 2: c pd is defined as the value of the internal equivalent capacitance which is ca lculated from the operating current consumption without load. average operating current can be obtained by the equation: i cc (opr) = c pd v cc f in + i cc /8 (per bit) noise characteristics (input: t r = t f = 3 ns) test condition ta = 25c characteristics symbol v cc (v) typ. limit unit quiet output maximum dynamic v ol v olp c l = 50 pf 5.0 0.8 1.0 v quiet output minimum dynamic v ol v olv c l = 50 pf 5.0 ? 0.8 ? 1.0 v minimum high level dynamic input voltage v ihd c l = 50 pf 5.0 ? 2.0 v maximum low level dynamic input voltage v ild c l = 50 pf 5.0 ? 0.8 v
tc74vhct240,244af/aft/afk 2008-12-01 6 package dimensions weight: 0.22 g (typ.)
tc74vhct240,244af/aft/afk 2008-12-01 7 package dimensions weight: 0.08 g (typ.)
tc74vhct240,244af/aft/afk 2008-12-01 8 package dimensions weight: 0.03 g (typ.)
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