SN74LS645-1DW by TI Design and production,in INSO(INCREDIBLE SOLUTION) Spot sales,And can pass INSO(INCREDIBLE SOLUTION) Purchasing。SN74LS645-1DW Price reference $ 0。SN74LS645-1DW - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information SN74LS645-1DW Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial