M74HC00TTR by STMicroelectronics Design and production,in TanJiayuan Electronics Spot sales,And can pass TanJiayuan Electronics Purchasing。M74HC00TTR Price reference ¥ 2.320671。M74HC00TTR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information M74HC00TTR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial