The DS89C450 is a device from Dallas Semiconductor which is now Maxim Integrated Products. Maxim parts can be purchased from Maxim direct or Avnet. You can get the best pricing information by contacting the Maxim sales group at the following link: **broken link removed** or by phone at 888-629-4642 if you are in the US. If you are from another country the following link has the direct numbers to the Maxim sales department for that country: **broken link removed**. If you choose Avnet rather the number is 1-800-332-8638. Hope this helps with your question.
Moe Rubenzahl
Executive Director of Internet Marketing
Maxim Integrated Products: Innovation Delivered