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TC74VCX244FT 2001-10-17 1 toshiba cmos digital integrated circuit silicon monolithic TC74VCX244FT low-voltage octal bus buffer with 3.6-v tolerant inputs and outputs the TC74VCX244FT is a high-performance cmos octal bus buffer. designed for use in 1.8-v, 2.5-v or 3.3-v systems, it achieves high-speed operation while maintaining the cmos low power dissipation. it is also designed with overvoltage tolerant inputs and outputs up to 3.6 v. this device is non-inverting 3-state buffer having four active-low output enables. when the oe input is high, the outputs are in a high-impedance state. this device is designed to be used with 3-state memory address drivers, etc. all inputs are equipped with protection circuits against static discharge. features low-voltage operation: v cc = 1.8 to 3.6 v high-speed operation : t pd = 3.5 ns (max) (v cc = 3.0 to 3.6 v) : t pd = 4.2 ns (max) (v cc = 2.3 to 2.7 v) : t pd = 8.4 ns (max) (v cc = 1.8 v) output current : i oh /i ol = 24 ma (min) (v cc = 3.0 v) : i oh /i ol = 18 ma (min) (v cc = 2.3 v) : i oh /i ol = 6 ma (min) (v cc = 1.8 v) latch-up performance: 300 ma esd performance : machine model > 200 v : human body model > 2000 v package: tssop (thin shrink small outline package) 3.6-v tolerant function and power-down protection provided on all inputs and outputs weight: 0.08 g (typ.)
TC74VCX244FT 2001-10-17 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 maximum ratings characteristics symbol rating unit power supply voltage v cc 0.5 to 4.6 v dc input voltage v in 0.5 to 4.6 v 0.5 to 4.6 (note 1) dc output voltage v out 0.5 to v cc 0.5 (note 2) v input diode current i ik 50 ma output diode current i ok 50 (note 3) 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: off state note 2: high or low state. i out absolute maximum rating must be observed. note 3: v out gnd, v out v cc v cc 20 oe 2 1y1 2a4 1y2 2a3 19 18 17 16 15 14 oe 1 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 6 4 1a1 8 18 14 16 12 en oe 2 1a2 1a3 1a4 1y1 1y2 1y3 1y4 19 11 15 13 2a1 17 9 5 7 3 en oe 2 2a2 2a3 2a4 2y1 2y2 2y3 2y4
TC74VCX244FT 2001-10-17 3 recommended operating range characteristics symbol rating unit 1.8 to 3.6 power supply voltage v cc 1.2 to 3.6 (note 4) v input voltage v in 0.3 to 3.6 v 0 to 3.6 (note 5) output voltage v out 0 to v cc (note 6) v 24 (note 7) 18 (note 8) output current i oh /i ol 6 (note 9) ma operating temperature t opr 40 to 85 c input rise and fall time dt/dv 0 to 10 (note 10) ns/v note 4: data retention only note 5: off state note 6: high or low state note 7: v cc 3.0 to 3.6 v note 8: v cc 2.3 to 2.7 v note 9: v cc 1.8 v note 10: v in 0.8 to 2.0 v, v cc 3.0 v electrical characteristics dc characteristics (ta 40 to 85c, 2.7 v v cc 3.6 v) characteristics symbol test condition v cc (v) min max unit h-level v ih 2.7 to 3.6 2.0 input voltage l-level v il 2.7 to 3.6 0.8 v i oh 100 a 2.7 to 3.6 v cc 0.2 i oh 12 ma 2.7 2.2 i oh 18 ma 3.0 2.4 h-level v oh v in v ih or v il i oh 24 ma 3.0 2.2 i ol 100 a 2.7 to 3.6 0.2 i ol 12 ma 2.7 0.4 i ol 18 ma 3.0 0.4 output voltage l-level v ol v in v ih or v il i ol 24 ma 3.0 0.55 v input leakage current i in v in 0 to 3.6 v 2.7 to 3.6 5.0 a 3-state output off state current i oz v in v ih or v il v out 0 to 3.6 v 2.7 to 3.6 10.0 a power-off leakage current i off v in , v out 0 to 3.6 v 0 10.0 a v in v cc or gnd 2.7 to 3.6 20.0 quiescent supply current i cc v cc (v in , v out ) 3.6 v 2.7 to 3.6 20.0 increase in i cc per input i cc v ih v cc 0.6 v 2.7 to 3.6 750 a
TC74VCX244FT 2001-10-17 4 dc characteristics (ta 40 to 85c, 2.3 v v cc 2.7 v) characteristics symbol test condition v cc (v) min max unit h-level v ih 2.3 to 2.7 1.6 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 6 ma 2.3 2.0 i oh 12 ma 2.3 1.8 h-level v oh v in v ih or v il i oh 18 ma 2.3 1.7 i ol 100 a 2.3 to 2.7 0.2 i ol 12 ma 2.3 0.4 output voltage l-level v ol v in v ih or v il i ol 18 ma 2.3 0.6 v input leakage current i in v in 0 to 3.6 v 2.3 to 2.7 5.0 a 3-state output off state current i oz v in v ih or v il v out 0 to 3.6 v 2.3 to 2.7 10.0 a power-off leakage current i off v in , v out 0 to 3.6 v 0 10.0 a v in v cc or gnd 2.3 to 2.7 20.0 quiescent supply current i cc v cc (v in , v out ) 3.6 v 2.3 to 2.7 20.0 a dc characteristics (ta 40 to 85c, 1.8 v v cc 2.3 v) characteristics symbol test condition v cc (v) min max unit h-level v ih 1.8 to 2.3 0.7
v cc input voltage l-level v il 1.8 to 2.3 0.2
v cc v i oh 100 a 1.8 v cc 0.2 h-level v oh v in v ih or v il i oh 6 ma 1.8 1.4 i ol 100 a 1.8 0.2 output voltage l-level v ol v in v ih or v il i ol 6 ma 1.8 0.3 v input leakage current i in v in 0 to 3.6 v 1.8 5.0 a 3-state output off state current i oz v in v ih or v il v out 0 to 3.6 v 1.8 10.0 a power-off leakage current i off v in , v out 0 to 3.6 v 0 10.0 a v in v cc or gnd 1.8 20.0 quiescent supply current i cc v cc (v in , v out ) 3.6 v 1.8 20.0 a
TC74VCX244FT 2001-10-17 5 ac characteristics (ta 40 to 85c, input: t r t f 2.0 ns, c l 30 pf, r l 500 ) characteristics symbol test condition v cc (v) min max unit 1.8 1.5 8.4 2.5 0.2 0.8 4.2 propagation delay time t plh t phl figure 1, figure 2 3.3 0.3 0.6 3.5 ns 1.8 1.5 9.8 2.5 0.2 0.8 5.5 3-state output enable time t pzl t pzh figure 1, figure 3 3.3 0.3 0.6 4.5 ns 1.8 1.5 5.8 2.5 0.2 0.8 3.2 3-state output disable time t plz t phz figure 1, figure 3 3.3 0.3 0.6 3.0 ns 1.8 0.5 2.5 0.2 0.5 output to output skew t oslh t oshl (note 11) 3.3 0.3 0.5 ns for c l 50 pf, add approximately 300 ps to the ac maximum specification. note 11: 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 2.0 ns, c l 30 pf) characteristics symbol test condition v cc (v) typ. unit v ih 1.8 v, v il 0 v (note 12) 1.8 0.25 v ih 2.5 v, v il 0 v (note 12) 2.5 0.6 quiet output maximum dynamic v ol v olp v ih 3.3 v, v il 0 v (note 12) 3.3 0.8 v v ih 1.8 v, v il 0 v (note 12) 1.8 0.25 v ih 2.5 v, v il 0 v (note 12) 2.5 0.6 quiet output minimum dynamic v ol v olv v ih 3.3 v, v il 0 v (note 12) 3.3 0.8 v v ih 1.8 v, v il 0 v (note 12) 1.8 1.5 v ih 2.5 v, v il 0 v (note 12) 2.5 1.9 quiet output minimum dynamic v oh v ohv v ih 3.3 v, v il 0 v (note 12) 3.3 2.2 v note 12: parameter guaranteed by design. capacitive characteristics (ta 25c) characteristics symbol test condition v cc (v) typ. unit input capacitance c in 1.8, 2.5, 3.3 6 pf output capacitance c o 1.8, 2.5, 3.3 7 pf power dissipation capacitance c pd f in 10 mhz (note 13) 1.8, 2.5, 3.3 20 pf note 13: 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)
TC74VCX244FT 2001-10-17 6 ac test circuit ac waveform figure 1 parameter switch t plh , t phl open t plz , t pzl 6.0 v @v cc 3.3 0.3 v v cc
2 @v cc 2.5 0.2 v @v cc 1.8 v t phz , t pzh gnd 6.0 v or v cc
2 open gnd switch output measure c l 30 pf r l 500 r l r l c l figure 2 t plh , t phl 90% 10% output (y) input (a) v ol v oh v ih v m t plh t phl t r 2.0 ns v m gnd t f 2.0 ns
TC74VCX244FT 2001-10-17 7 v cc symbol 3.3 0.3 v 2.5 0.2 v 1.8 v v ih 2.7 v v cc v cc v m 1.5 v v cc /2 v cc /2 v x v ol 0.3 v v ol 0.15 v v ol 0.15 v v y v oh 0.3 v v oh 0.15 v v oh 0.15 v figure 3 t plz , t phz , t pzl , t pzh 90% 10% v ol 3.0 v or v cc gnd v ih v m t phz t pzh t r 2.0 ns v m gnd v oh outputs enabled v m t plz t pzl v y outputs disabled outputs enabled output enable control ( oe ) output (y) low to off to low output (y) high to off to high v x t f 2.0 ns
TC74VCX244FT 2001-10-17 8 package dimensions weight: 0.08 g (typ.)
TC74VCX244FT 2001-10-17 9 toshiba is continually working to improve the quality and reliability of its products. nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. it is the responsibility of the buyer, when utilizing toshiba products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such toshiba products could cause loss of human life, bodily injury or damage to property. in developing your designs, please ensure that toshiba products are used within specified operating ranges as set forth in the most recent toshiba products specifications. also, please keep in mind the precautions and conditions set forth in the ?handling guide for semiconductor devices,? or ?toshiba semiconductor reliability handbook? etc.. the toshiba products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). these toshiba products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (?unintended usage?). unintended usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. unintended usage of toshiba products listed in this document shall be made at the customer?s own risk. the products described in this document are subject to the foreign exchange and foreign trade laws. the information contained herein is presented only as a guide for the applications of our products. no responsibility is assumed by toshiba corporation for any infringements of intellectual property or other rights of the third parties which may result from its use. no license is granted by implication or otherwise under any intellectual property or other rights of toshiba corporation or others. the information contained herein is subject to change without notice. 000707eb a restrictions on product use

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