2013-02-12 rev.1.0 74VHCT240AFT,74vhct244aft 1 cmos digital integrated circuits silicon monolithic 74VHCT240AFT,74vhct244aft 74VHCT240AFT,74vhct244aft 74VHCT240AFT,74vhct244aft 74VHCT240AFT,74vhct244aft 1. 1. 1. 1. functional description functional description functional description functional description ? octal bus buffer 74VHCT240AFT: inverted, 3-state outputs 74vhct244aft: non-inverted, 3-state outputs 2. 2. 2. 2. general general general general the 74VHCT240AFT and 74vhct244aft 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 74VHCT240AFT is an inverting 3-state buffer having two active-low output enables. the 74vhct244aft 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 circuit ensure that 0 to 5.5 v can be applied to the input and output (note) pins without regard to the supply voltage. these structure prevents device destruction due to mismatched supply and input/output voltages such as battery back up, hot board insertion, etc. note: output in off-state 3. 3. 3. 3. features features features features (1) high speed: propagation delay time = 6.1 ns (typ.) at v cc = 5 v (2) quiescent supply current: i cc = 4 a (max) at t a = 25 (3) compatible with ttl input: v il = 0.8 v(max) v ih = 2.0 v(min) (4) power down protection is provided on all inputs and outputs. (5) balanced propagation delays: t plh t phl (6) low noise: v olp = 1.0 v (max) (7) pin and function compatible with the 74 series (74act/hct/ahct etc.) 240/244 type. 4. 4. 4. 4. packaging packaging packaging packaging tssop20b
2013-02-12 rev.1.0 74VHCT240AFT,74vhct244aft 2 5. 5. 5. 5. pin assignment pin assignment pin assignment pin assignment 74VHCT240AFT 74vhct244aft 6. 6. 6. 6. marking marking marking marking 74VHCT240AFT 74vhct244aft 7. 7. 7. 7. iec logic symbol iec logic symbol iec logic symbol iec logic symbol 74VHCT240AFT 74vhct244aft
2013-02-12 rev.1.0 74VHCT240AFT,74vhct244aft 3 8. 8. 8. 8. truth table truth table truth table truth table input g l l h input a n l h x output y n l h z output y n h l z x: don't care (l or h) z: high impedance y n : 74vhct244aft y n : 74VHCT240AFT 9. 9. 9. 9. absolute maximum ratings (note) absolute maximum ratings (note) absolute maximum ratings (note) absolute maximum ratings (note) characteristics supply voltage input voltage output voltage input diode current output diode current output current v cc /ground current power dissipation storage temperature symbol v cc v in v out i ik i ok i out i cc p d t stg note (note1) (note2) (note3) rating -0.5 to 7.0 -0.5 to 7.0 -0.5 to 7.0 -0.5 to v cc + 0.5 -20 20 25 75 180 -65 to 150 unit v ma mw 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 application 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 temperature/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). note1: output in off-state. note2: high (h) or low (l) state. i out absolute maximum rating must be observed. note3: v out < gnd, v out > vcc 10. 10. 10. 10. operating ranges (note) operating ranges (note) operating ranges (note) operating ranges (note) characteristics supply voltage input voltage output voltage operating temperature input rise and fall times symbol v cc v in v out t opr dt/dv note (note1) (note2) rating 4.5 to 5.5 0 to 5.5 0 to 5.5 0 to v cc -40 to 85 0 to 20 unit v ns/v note: the operating ranges must be maintained to ensure the normal operation of the device. unused inputs and bus inputs must be tied to either v cc or gnd. note1: output in off state. note2: high (h) or low (l) state.
2013-02-12 rev.1.0 74VHCT240AFT,74vhct244aft 4 11. 11. 11. 11. electrical characteristics electrical characteristics electrical characteristics electrical characteristics 11.1. 11.1. 11.1. 11.1. dc characteristics (unless otherwise specified, t dc characteristics (unless otherwise specified, t dc characteristics (unless otherwise specified, t dc characteristics (unless otherwise specified, t a a a a = 25 = 25 = 25 = 25 ) ) ) ) characteristics high-level input voltage low-level input voltage high-level output voltage low-level output voltage 3-state output off-state leakage current input leakage current quiescent supply current output leakage current (power-off) symbol v ih v il v oh v ol i oz i in i cc i cct i opd test condition v in = v ih or v il v in = v ih or v il v in = v ih or v il v out = v cc or gnd v in = 5.5 v or gnd v in = v cc or gnd per input :v in = 3.4v other input:v cc or gnd v out = 5.5 v i oh = -50 a i oh = -8 ma i ol = 50 a i ol = 8 ma v cc (v) 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 5.5 0 to 5.5 5.5 5.5 0 min 2.0 4.40 3.94 typ. 4.50 0.0 max 0.8 0.10 0.36 0.25 0.1 4.0 1.35 0.5 unit v a ma a 11.2. 11.2. 11.2. 11.2. dc characteristics (unless otherwise specified, t dc characteristics (unless otherwise specified, t dc characteristics (unless otherwise specified, t dc characteristics (unless otherwise specified, t a a a a = -40 to 85 = -40 to 85 = -40 to 85 = -40 to 85 ) ) ) ) characteristics high-level input voltage low-level input voltage high-level output voltage low-level output voltage 3-state output off-state leakage current input leakage current quiescent supply current quiescent supply current output leakage current (power-off) symbol v ih v il v oh v ol i oz i in i cc i cct i opd test condition v in = v ih or v il v in = v ih or v il v in = v ih or v il v out = v cc or gnd v in = 5.5 v or gnd v in = v cc or gnd per input: v in = 3.4 v, other input: v cc or gnd v out = 5.5 v i oh = -50 a i oh = -8 ma i ol = 50 a i ol = 8 ma v cc (v) 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 5.5 0 to 5.5 5.5 5.5 0 min 2.0 4.4 3.80 max 0.8 0.1 0.44 2.50 1.0 40.0 1.50 5.0 unit v a ma a
2013-02-12 rev.1.0 74VHCT240AFT,74vhct244aft 5 11.3. 11.3. 11.3. 11.3. ac characteristics (unless otherwise specified, t ac characteristics (unless otherwise specified, t ac characteristics (unless otherwise specified, t ac characteristics (unless otherwise specified, t a a a a = 25 = 25 = 25 = 25 , input: t , input: t , input: t , input: t r r r r = t = t = t = t f f f f = 3 ns) = 3 ns) = 3 ns) = 3 ns) characteristics propagation delay time 3-state output enable time 3-state output disable time output skew input capacitance output capacitance power dissipation capacitance power dissipation capacitance part number 74VHCT240AFT 74vhct244aft 74VHCT240AFT 74vhct244aft symbol t plh ,t phl t plh ,t phl t pzl ,t pzh t plz ,t phz t oslh ,t oshl c in c out c pd c pd note (note 1) (note 2) (note 2) test condition r l = 1 k ? r l = 1 k ? v cc (v) 5.0 0.5 5.0 0.5 5.0 0.5 5.0 0.5 5.0 0.5 c l (pf) 15 50 15 50 15 50 50 50 min typ. 5.6 6.1 5.4 5.9 7.7 8.2 8.8 4 9 19 18 max 7.8 8.8 7.4 8.4 10.4 11.4 11.4 1.0 10 unit ns pf 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 calculated 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) 11.4. 11.4. 11.4. 11.4. ac characteristics ac characteristics ac characteristics ac characteristics (unless otherwise specified, t (unless otherwise specified, t (unless otherwise specified, t (unless otherwise specified, t a a a a = -40 to 85 = -40 to 85 = -40 to 85 = -40 to 85 , input: t , input: t , input: t , input: t r r r r = t = t = t = t f f f f = 3 ns) = 3 ns) = 3 ns) = 3 ns) characteristics propagation delay time 3-state output enable time 3-state output disable time output skew input capacitance part number 74VHCT240AFT 74vhct244aft symbol t plh ,t phl t plh ,t phl t pzl ,t pzh t plz ,t phz t oslh ,t oshl c in note (note 1) test condition r l = 1 k ? r l = 1 k ? v cc (v) 5.0 0.5 5.0 0.5 5.0 0.5 5.0 0.5 5.0 0.5 c l (pf) 15 50 15 50 15 50 50 50 min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 max 9.0 10.0 8.5 9.5 12.0 13.0 13.0 1.0 10 unit ns pf note 1: parameter guaranteed by design. (t oslh = |t plhm - t plhn |, t oshl = |t phlm - t phln |) 11.5. 11.5. 11.5. 11.5. noise characteristics (unless otherwise specified, t noise characteristics (unless otherwise specified, t noise characteristics (unless otherwise specified, t noise characteristics (unless otherwise specified, t a a a a = 25 = 25 = 25 = 25 , input: t , input: t , input: t , input: t r r r r = t = t = t = t f f f f = 3 ns) = 3 ns) = 3 ns) = 3 ns) characteristics quiet output maximum dynamic v ol quiet output minimum dynamic v ol minimum high-level dynamic input voltage maximum low-level dynamic input voltage symbol v olp v olv v ihd v ild test condition c l = 50 pf c l = 50 pf c l = 50 pf c l = 50 pf v cc (v) 5.0 5.0 5.0 5.0 typ. 0.8 -0.8 limit 1.0 -1.0 2.0 0.8 unit v
2013-02-12 rev.1.0 74VHCT240AFT,74vhct244aft 6 package dimensions package dimensions package dimensions package dimensions unit: mm weight: 0.071 g (typ.) package name(s) nickname: tssop20b
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