http://www.futureelectronics.com/en/Search.aspx?dsNav=Ntk:ManufacturerPartNumberUpshiftedSearch%7c*MCP7940M*%7c1%7c,Ny:True,Ro:0,Nea:True,N:587 . , the MCP7940M. Just made for high volume reduced tolerance low-cost consumer electronics this I2C real-tim