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This literature is subject to all applicable copyright laws and is not for resale in any manner. フェアチャイルド セミコンダクター社 アプリケーションノート 5V/3V レベル変換におけるフェアチャイルド スイッチ 5V/3Vレベル変換におけるフェアチャイルド （バス スイッチ）の使用方法 フェアチャイルド スイッチ（FST）は超高速（Tpd≦250ps）、低消 費電力（Icc≦10uA）で5V/3Vレベル変換が実現できます。 ワード電流（If）を最適化する為に、図のように抵抗を配置します。 尚、抵抗値はダイオード特性により選択して下さい。 当製品は特性上、入力電圧と電源電圧 Vcc が同レベルの場合、出力 5V電源電圧Vccが0.7V降下することにより、当製品のVccピンの電圧 電圧は電源電圧 Vcc よりも約1V電圧降下します。又、出力電圧は、 電源電圧 Vcc の変化量に比例します。この出力特性より、当製品に ダイオードを5V電源電圧 Vcc と GND間 に接続して5V/3Vレベル変 換に使用することができます。使用するにあたり、ダイオードの特性 である順方向の電圧降下（Vf=0.7V）を利用し、ダイオードのフォ がVcc=約4.3V（5V-0.7V=4.3V）になり、当製品内部ゲートも電圧 VG=約4.3Vが印可されます。そして当製品はFETの為、ゲートソース 間で1 V の電圧降下が生じ、よってこの電圧降下により出力電圧 Vmax=約3.3Vになります。その結果、3V製品との双方向インタフ エースが実現出来ます。 Simplified Diagram of a Switch © 1999 Fairchild Semiconductor Corporation AN012461 www.fairchildsemi.com AN-996J 5V/3V レベル変換におけるフェアチャイルド スイッチ（バス スイッチ）の使用方法 5V/3Vレベル変換におけるフェアチャイルド AN-966J 5V/3Vレベル変換におけるフェアチャイルド レベル変換におけるフェアチャイルド スイッチ（バス スイッチ）の使用方法 AN-996J 5V/3V フェアチャイルド社はここで述べた回路の使用に関し一切の責任を負わない。また、回路の特許ライセンスを許可するものでもない。フェアチャイルド社は前記回路および仕様をいつでも予告なく変更する権利を留保する。 生命維持に関する方針 フェアチャイルド･セミコンダクターの社長の書面による明確な許可なく、生命維持装置または生命維持システムの重要 部品としてフェアチャイルド社の製品を使用することを禁じる。ここで、「生命維持装置または生命維持システム」お よび「重要部品」の意味は、以下のとおりである。 2. 重要部品とは、生命維持装置または生命維持システムのいかなる 部品であるかにかかわらず、故障が発生すると、それが生命維持 装置もしくは生命維持システムの故障につながるか、またはその 安全性もしくは有効性に影響を与えることが十分に予想される部 品である。 www.fairchildsemi.com 1. 生命維持装置または生命維持システムとは、(a) 外科的に体内に移 植することを目的にしたもの、または、(b) 生命を支持または維持 するもので、かつ (c) ラベルに記された使用手順にしたがって正 しく使用していても故障が発生すると使用者に重大な傷害を及ぼ すことが十分に予想される装置またはシステムである。 2 www.fairchildsemi.com ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. 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