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CD74HC123: CD74HC123NSR

Part Number: CD74HC123

Rxに100kΩ(RG2012P-104-D)、Cxに10µF(GRM188R61C106K)を接続。計算上はTwは450msですが、実測値は238msでした。

原因をご教示頂けませんでしょうか?