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  2013-10-16 rev.1.0 74LCX240FT 1 cmos digital integrated circuits silicon monolithic 74LCX240FT 74LCX240FT 74LCX240FT 74LCX240FT 1. 1. 1. 1. functional description functional description functional description functional description ? low-voltage octal bus buffer (inverted) with 5-v tolerant inputs and outputs 2. 2. 2. 2. general general general general the 74LCX240FT is a high-performance cmos octal bus buffer. designed for use in 3.3-v systems, it achieves high-speed operation while maintaining the cmos low power dissipation. the device is designed for low-voltage (3.3 v) v cc applications, but it could be used to interface to 5 v supply environment for both inputs and outputs. the 74LCX240FT is an inverting 3-state buffer having two active-low output enables. this device is designed to be used with 3-state memory address drivers, etc. all inputs are equipped with protection circuits against static discharge. 3. 3. 3. 3. features (note) features (note) features (note) features (note) (1) low-voltage operation: v cc = 1.65 to 3.6 v (2) high-speed operation: t pd = 6.5 ns (max) (v cc = 3.0 to 3.6 v) (3) output current: |i oh |/i ol = 24 ma (min) (v cc = 3.0 to 3.6 v) (4) power-down protection provided on all inputs and outputs (5) pin and function compatible with the 74 series (74lvc/alvc/ etc.) 240 type note: do not apply a signal to any bus pins when it is in the output mode. damage may result. all floating (high impedance) bus pins must have their input levels fixed by means of pull-up or pull-down resistors. 4. 4. 4. 4. packaging packaging packaging packaging tssop20b
2013-10-16 rev.1.0 74LCX240FT 2 5. 5. 5. 5. pin assignment pin assignment pin assignment pin assignment 6. 6. 6. 6. marking marking marking marking 7. 7. 7. 7. iec logic symbol iec logic symbol iec logic symbol iec logic symbol
2013-10-16 rev.1.0 74LCX240FT 3 8. 8. 8. 8. truth table truth table truth table truth table input oe l l h input an l h x output h l z x: don't care z: high impedance 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 output voltage input diode current output diode current output current power dissipation v cc /ground current storage temperature symbol v cc v in v out v out i ik i ok i out p d i cc /i gnd t stg note (note 1) (note 2) (note 3) rating -0.5 to 6.5 -0.5 to 6.5 -0.5 to 6.5 -0.5 to v cc + 0.5 -50 50 50 180 100 -65 to 150 unit v v v ma ma ma mw ma 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). note 1: output in off state. note 2: high (h) or low (l) state. i out absolute maximum rating must be observed. note 3: v out < gnd, v out > v cc
2013-10-16 rev.1.0 74LCX240FT 4 10. 10. 10. 10. operating ranges (note) operating ranges (note) operating ranges (note) operating ranges (note) characteristics supply voltage input voltage output voltage output voltage output current operating temperature input rise and fall times symbol v cc v in v out v out i oh ,i ol i oh ,i ol t opr dt/dv note (note 1) (note 2) (note 3) (note 4) (note 5) (note 6) rating 1.65 to 3.6 1.5 to 3.6 0 to 5.5 0 to 5.5 0 to v cc 24 12 -40 to 85 0 to 10 unit v v v ma 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. please connect both bus inputs and the bus outputs with v cc or gnd when the i/o of the bus terminal changes by the function. in this case, please note that the output is not short-circuited. note 1: data retention only. note 2: output in off state. note 3: high or low state note 4: v cc = 3.0 to 3.6 v note 5: v cc = 2.7 to 3.0 v note 6: v in =0.8 to 2.0 v , v cc = 3.0 v 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 = -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 input leakage current 3-state output off-state leakage current power-off leakage current quiescent supply current quiescent supply current symbol v ih v il v oh v ol i in i oz i off i cc ? i cc test condition v in = v ih or v il v in = v ih or v il v in = 0 to 5.5 v v in = v ih or v il v out = 0 to 5.5 v v in /v out = 5.5 v v in = v cc or gnd v in /v out = 3.6 to 5.5 v v ih = v cc - 0.6 v i oh = -100 a i oh = -4 ma i oh = -8 ma i oh = -12 ma i oh = -18 ma i oh = -24 ma i ol = 100 a i ol = 4 ma i ol = 8 ma i ol = 12 ma i ol = 16 ma i ol = 24 ma v cc (v) 1.65 to 2.3 2.3 to 2.7 2.7 to 3.6 1.65 to 2.3 2.3 to 2.7 2.7 to 3.6 1.65 to 3.6 1.65 2.3 2.7 3.0 3.0 1.65 to 3.6 1.65 2.3 2.7 3.0 3.0 1.65 to 3.6 1.65 to 3.6 0 1.65 to 3.6 1.65 to 3.6 2.7 to 3.6 min v cc 0.9 1.7 2.0 v cc - 0.2 1.05 1.7 2.2 2.4 2.2 max v cc 0.1 0.7 0.8 0.2 0.45 0.7 0.4 0.4 0.55 5.0 5.0 10.0 10.0 10.0 500 unit v v a a a a
2013-10-16 rev.1.0 74LCX240FT 5 11.2. 11.2. 11.2. 11.2. 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 = -40 to 85 = -40 to 85 = -40 to 85 = -40 to 85 ) ) ) ) characteristics propagation delay time 3-state output enable time 3-state output disable time output skew symbol t plh ,t phl t pzl ,t pzh t plz ,t phz t oslh ,t oshl note (note 1) test condition see 11.5 ac test circuit, table 11.5.1, fig. 11.6.1 see 11.5 ac test circuit, table 11.5.1, fig. 11.6.2 see 11.5 ac test circuit, table 11.5.1, fig. 11.6.2 v cc (v) 1.8 0.15 2.5 0.2 2.7 3.3 0.3 1.8 0.15 2.5 0.2 2.7 3.3 0.3 1.8 0.15 2.5 0.2 2.7 3.3 0.3 2.7 3.3 0.3 min 1.5 1.5 1.5 max 25.0 8.5 7.5 6.5 32.0 16.0 9.0 8.0 30.0 15.0 8.0 7.0 1.0 unit ns ns ns ns note 1: parameter guaranteed by design. (t oslh = |t plhm - t plhn |, t oshl = |t phlm - t phln |) 11.3. 11.3. 11.3. 11.3. dynamic switching characteristics (unless otherwise specified, t dynamic switching characteristics (unless otherwise specified, t dynamic switching characteristics (unless otherwise specified, t dynamic switching 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 = 2.5 ns, c = 2.5 ns, c = 2.5 ns, c = 2.5 ns, c l l l l = 50 pf, r = 50 pf, r = 50 pf, r = 50 pf, r l l l l = 500 = 500 = 500 = 500 ? ? ? ? ) ) ) ) characteristics quiet output maximum dynamic v ol quiet output minimum dynamic v ol symbol v olp v olv test condition v ih = 3.3 v, v il = 0 v v ih = 3.3 v, v il = 0 v v cc (v) 3.3 3.3 typ. 0.8 0.8 unit v v 11.4. 11.4. 11.4. 11.4. capacitive characteristics (unless otherwise specified, t capacitive characteristics (unless otherwise specified, t capacitive characteristics (unless otherwise specified, t capacitive characteristics (unless otherwise specified, t a a a a = 25 = 25 = 25 = 25 ) ) ) ) characteristics input capacitance output capacitance power dissipation capacitance symbol c in c out c pd note (note 1) test condition f in = 10 mhz v cc (v) 3.3 3.3 3.3 typ. 7 8 25 unit pf pf pf note 1: 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)
2013-10-16 rev.1.0 74LCX240FT 6 11.5. 11.5. 11.5. 11.5. ac test ciruict ac test ciruict ac test ciruict ac test ciruict table table table table 11.5.1 11.5.1 11.5.1 11.5.1 parameter for ac test circuit parameter for ac test circuit parameter for ac test circuit parameter for ac test circuit parameter t plh , t phl t plz , t pzl t phz , t pzh switch open 6.0 v v cc 2 gnd test condition v cc = 3.3 0.3 v v cc = 2.7 v v cc = 2.5 0.2 v v cc = 1.8 0.15 v
2013-10-16 rev.1.0 74LCX240FT 7 11.6. 11.6. 11.6. 11.6. ac waveform ac waveform ac waveform ac waveform fig. fig. fig. fig. 11.6.1 11.6.1 11.6.1 11.6.1 t t t t plh plh plh plh , t , t , t , t phl phl phl phl fig. fig. fig. fig. 11.6.2 11.6.2 11.6.2 11.6.2 t t t t plz plz plz plz , t , t , t , t phz phz phz phz , t , t , t , t pzl pzl pzl pzl , t , t , t , t pzh pzh pzh pzh table table table table 11.6.1 11.6.1 11.6.1 11.6.1 ac waveform symbols ac waveform symbols ac waveform symbols ac waveform symbols input output load symbol v ih v im t r , t f v om v x v y c l r l v cc = 3.3 0.3 v v cc = 2.7 v 2.7 v 1.5 v 2.5 ns 1.5 v v ol + 0.3 v v oh - 0.3 v 50 pf 500 ? v cc = 2.5 0.2 v v cc v cc /2 2.0 ns v oh /2 v ol + 0.15 v v oh - 0.15 v 30 pf 500 ? v cc = 1.8 0.15 v v cc v cc /2 2.0 ns v oh /2 v ol + 0.15 v v oh - 0.15 v 30 pf 1 k ?
2013-10-16 rev.1.0 74LCX240FT 8 package dimensions package dimensions package dimensions package dimensions unit: mm weight: 0.071 g (typ.) package name(s) nickname: tssop20b
2013-10-16 rev.1.0 74LCX240FT 9 restrictions on product use restrictions on product use restrictions on product use restrictions on product use ? toshiba corporation, and its subsidiaries and affiliates (collectively "toshiba"), reserve the right to make changes to the information in this document, and related hardware, software and systems (collectively "product") without notice. ? this document and any information herein may not be reproduced without prior written permission from toshiba. even with toshiba's written permission, reproduction is permissible only if reproduction is without alteration/omission. ? though toshiba works continually to improve product's quality and reliability, product can malfunction or fail. customers are responsible for complying with safety standards and for providing adequate designs and safeguards for their hardware, software and systems which minimize risk and avoid situations in which a malfunction or failure of product could cause loss of human life, bodily injury or damage to property, including data loss or corruption. before customers use the product, create designs including the product, or incorporate the product into their own applications, customers must also refer to and comply with (a) the latest versions of all relevant toshiba information, including without limitation, this document, the specifications, the data sheets and application notes for product and the precautions and conditions set forth in the "toshiba semiconductor reliability handbook" and (b) the instructions for the application with which the product will be used with or for. customers are solely responsible for all aspects of their own product design or applications, including but not limited to (a) determining the appropriateness of the use of this product in such design or applications; (b) evaluating and determining the applicability of any information contained in this document, or in charts, diagrams, programs, algorithms, sample application circuits, or any other referenced documents; and (c) validating all operating parameters for such designs and applications. toshiba assumes no liability for customers' product design or applications. toshiba assumes no liability for customers' product design or applications. toshiba assumes no liability for customers' product design or applications. toshiba assumes no liability for customers' product design or applications. ? product is neither intended nor warranted for use in equipments or systems that require product is neither intended nor warranted for use in equipments or systems that require product is neither intended nor warranted for use in equipments or systems that require product is neither intended nor warranted for use in equipments or systems that require extraordinarily high levels of quality and/or reliability, and/or a malfunction or failure of which may extraordinarily high levels of quality and/or reliability, and/or a malfunction or failure of which may extraordinarily high levels of quality and/or reliability, and/or a malfunction or failure of which may extraordinarily high levels of quality and/or reliability, and/or a malfunction or failure of which may cause loss of human life, bodily injury, serious property damage and/or serious public impact cause loss of human life, bodily injury, serious property damage and/or serious public impact cause loss of human life, bodily injury, serious property damage and/or serious public impact cause loss of human life, bodily injury, serious property damage and/or serious public impact ("unintended use"). ("unintended use"). ("unintended use"). ("unintended use"). except for specific applications as expressly stated in this document, unintended use includes, without limitation, equipment used in nuclear facilities, equipment used in the aerospace industry, medical equipment, equipment used for automobiles, trains, ships and other transportation, traffic signaling equipment, equipment used to control combustions or explosions, safety devices, elevators and escalators, devices related to electric power, and equipment used in finance-related fields. if you use product for if you use product for if you use product for if you use product for unintended use, toshiba assumes no liability for product. unintended use, toshiba assumes no liability for product. unintended use, toshiba assumes no liability for product. unintended use, toshiba assumes no liability for product. for details, please contact your toshiba sales representative. ? do not disassemble, analyze, reverse-engineer, alter, modify, translate or copy product, whether in whole or in part. ? product shall not be used for or incorporated into any products or systems whose manufacture, use, or sale is prohibited under any applicable laws or regulations. ? the information contained herein is presented only as guidance for product use. no responsibility is assumed by toshiba for any infringement of patents or any other intellectual property rights of third parties that may result from the use of product. no license to any intellectual property right is granted by this document, whether express or implied, by estoppel or otherwise. ? absent a written signed agreement, except as provided in the relevant terms and conditions of sale absent a written signed agreement, except as provided in the relevant terms and conditions of sale absent a written signed agreement, except as provided in the relevant terms and conditions of sale absent a written signed agreement, except as provided in the relevant terms and conditions of sale for product, and to the maximum extent allowable by law, toshiba (1) assumes no liability whatsoever, for product, and to the maximum extent allowable by law, toshiba (1) assumes no liability whatsoever, for product, and to the maximum extent allowable by law, toshiba (1) assumes no liability whatsoever, for product, and to the maximum extent allowable by law, toshiba (1) assumes no liability whatsoever, including without limitation, indirect, consequential, special, or incidental damages or loss, including including without limitation, indirect, consequential, special, or incidental damages or loss, including including without limitation, indirect, consequential, special, or incidental damages or loss, including including without limitation, indirect, consequential, special, or incidental damages or loss, including without limitation, loss of profits, loss of opportunities, business interruption and loss of data, and without limitation, loss of profits, loss of opportunities, business interruption and loss of data, and without limitation, loss of profits, loss of opportunities, business interruption and loss of data, and without limitation, loss of profits, loss of opportunities, business interruption and loss of data, and (2) disclaims any and all express or implied warranties and conditions related to sale, use of product, (2) disclaims any and all express or implied warranties and conditions related to sale, use of product, (2) disclaims any and all express or implied warranties and conditions related to sale, use of product, (2) disclaims any and all express or implied warranties and conditions related to sale, use of product, or information, including warranties or conditions of merchantability, fitness for a particular or information, including warranties or conditions of merchantability, fitness for a particular or information, including warranties or conditions of merchantability, fitness for a particular or information, including warranties or conditions of merchantability, fitness for a particular purpose, accuracy of information, or noninfringement. purpose, accuracy of information, or noninfringement. purpose, accuracy of information, or noninfringement. purpose, accuracy of information, or noninfringement. ? do not use or otherwise make available product or related software or technology for any military purposes, including without limitation, for the design, development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or missile technology products (mass destruction weapons). product and related software and technology may be controlled under the applicable export laws and regulations including, without limitation, the japanese foreign exchange and foreign trade law and the u.s. export administration regulations. export and re-export of product or related software or technology are strictly prohibited except in compliance with all applicable export laws and regulations. ? please contact your toshiba sales representative for details as to environmental matters such as the rohs compatibility of product. please use product in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances, including without limitation, the eu rohs directive. toshiba assumes no liability for damages or losses occurring toshiba assumes no liability for damages or losses occurring toshiba assumes no liability for damages or losses occurring toshiba assumes no liability for damages or losses occurring as a result of noncompliance with applicable laws and regulations. as a result of noncompliance with applicable laws and regulations. as a result of noncompliance with applicable laws and regulations. as a result of noncompliance with applicable laws and regulations.


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