M74HC590B1R by STMicroelectronics Design and production,in GUI XIN Group (Hong Kong) Limited Spot sales,And can pass GUI XIN Group (Hong Kong) Limited Purchasing。M74HC590B1R Price reference $ 2.026400。M74HC590B1R - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information M74HC590B1R Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial