tc74vhc240,244f/ft/fk 2009-04-01 1 toshiba cmos digital integrat ed ci rcuit silicon monolithic tc74vhc240f,tc74vhc240ft,tc74vhc240fk tc74vhc244f,tc74vhc244ft,tc74vhc244fk octal bus buffer tc74vhc240f/ft/fk inverted, 3-state outputs tc74vhc244f/ft/fk non-inverted, 3-state outputs the tc74vhc240 and 244 are advanced high speed cmos octal bus buffers fabricated with silicon gate c 2 mos technology. they achieve the high speed op eration similar to equivalent bipolar schottky ttl while main taining the cmos low power dissipation. the 74vhc240 is an inverting 3-state buffer having two active-low output enables. the tc74vhc244 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. an input protection circuit en sures that 0 to 5.5 v can be applied to the input pins withou t regard to the supply voltage. this device can be used to interface 5 v to 3 v systems and two supply systems such as battery back up. this circuit prevents device destruction due to mismat ched supply and input voltages. features ? high speed: t pd = 3.9 ns (typ.) at v cc = 5 v ? low power dissipation: i cc = 4 a (max) at ta = 25c ? high noise immunity: v nih = v nil = 28% v cc (min) ? power down protection is provided on all inputs. ? balanced propagation delays: t plh ? t phl ? wide operating voltage range: v cc (opr) = 2 to 5.5 v ? low noise: v olp = 0.8 v (max) ? pin and function compatible with 74als240/244 tc74vhc240f, tc74vhc244f tc74vhc240ft, tc74vhc244ft tc74vhc240fk, tc74vhc244fk 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.)
tc74vhc240,244f/ft/fk 2009-04-01 2 pin assignment iec logic symbol truth table inputs outputs g a n y n n y l l l h l h h l h x z z x: don?t care z: high impedance y n : tc74vhc244 n y : tc74vhc240 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) tc74vhc240 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) tc74vhc244 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 tc74vhc240 (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 tc74vhc244 (19) (11) (15) (13) 2a2 2a4 2a3 (17) (9) (5) 2y2 2y4 (7) (3) 2y3 en g2 2y1 2a1
tc74vhc240,244f/ft/fk 2009-04-01 3 absolute maximum ratings (note) 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 dc output voltage v out ? 0.5 to v cc + 0.5 v input diode current i ik ? 20 ma output diode current i ok 20 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: 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). operating ranges (note) characteristics symbol rating unit supply voltage v cc 2.0 to 5.5 v input voltage v in 0 to 5.5 v output voltage v out 0 to v cc v operating temperature t opr ? 40 to 85 c input rise and fall time dt/dv 0 to 100 (v cc = 3.3 0.3 v) 0 to 20 (v cc = 5 0.5 v) ns/v note: the operating ranges must be maintained to ensure the normal oper ation of the device. unused inputs must be tied to either v cc or gnd.
tc74vhc240,244f/ft/fk 2009-04-01 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 2.0 3.0 to 5.5 1.50 v cc u 0.7 1.50 v cc u 0.7 v low-level input voltage v il 2.0 3.0 to 5.5 0.50 v cc u 0.3 D D 0.50 v cc u 0.3 v i oh 50 p a 2.0 3.0 4.5 1.9 2.9 4.4 2.0 3.0 4.5 1.9 2.9 4.4 high-level output voltage v oh v in v ih or v il i oh 4 ma i oh 8 ma 3.0 4.5 2.58 3.94 2.48 3.80 v i ol 50 p a 2.0 3.0 4.5 0.0 0.0 0.0 0.1 0.1 0.1 0.1 0.1 0.1 low-level output voltage v ol v in v ih or v il i ol 4 ma i ol 8 ma 3.0 4.5 0.36 0.36 0.44 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 quiescent supply current i cc v in v cc or gnd 5.5 4.0 40.0 p a
tc74vhc240,244f/ft/fk 2009-04-01 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 ? 5.3 7.5 1.0 9.0 3.3 0.3 50 ? 7.8 11.0 1.0 12.5 15 ? 3.6 5.5 1.0 6.5 propagation delay time (tc74vhc240) t plh t phl ? 5.0 0.5 50 ? 5.1 7.5 1.0 8.5 ns 15 ? 5.8 8.4 1.0 10.0 3.3 0.3 50 ? 8.3 11.9 1.0 13.5 15 ? 3.9 5.5 1.0 6.5 propagation delay time (tc74vhc244) t plh t phl ? 5.0 0.5 50 ? 5.4 7.5 1.0 8.5 ns 15 ? 6.6 10.6 1.0 12.5 3.3 0.3 50 ? 9.1 14.1 1.0 16.0 15 ? 4.7 7.3 1.0 8.5 3-state output enable time t pzl t pzh r l = 1 k 5.0 0.5 50 ? 6.2 9.3 1.0 10.5 ns 3.3 0.3 50 ? 10.3 14.0 1.0 16.0 3-state output disable time t plz t phz r l = 1 k 5.0 0.5 50 ? 6.7 9.2 1.0 10.5 ns 3.3 0.3 50 ? ? 1.5 ? 1.5 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 ? ? 6 ? ? ? pf tc74vhc240 ? 17 ? ? ? power dissipation capacitance (note 2) c pd tc74vhc244 ? 19 ? ? ? 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 0.5 0.8 v quiet output minimum dynamic v ol v olv c l = 50 pf 5.0 ? 0.5 ? 0.8 v minimum high level dynamic input voltage v ihd c l = 50 pf 5.0 ? 3.5 v maximum low level dynamic input voltage v ild c l = 50 pf 5.0 ? 1.5 v
tc74vhc240,244f/ft/fk 2009-04-01 6 input equivalent circuit input
tc74vhc240,244f/ft/fk 2009-04-01 7 package dimensions weight: 0.22 g (typ.)
tc74vhc240,244f/ft/fk 2009-04-01 8 package dimensions weight: 0.08 g (typ.)
tc74vhc240,244f/ft/fk 2009-04-01 9 package dimensions weight: 0.03 g (typ.)
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