Where is the data sheet for the AN21xx parts.

Answer:

The EZUSB parts AN21xx are obsolete (Refer to PCN050709 for more details), they do not have separate datasheet, EZ-USB FX1 (CY7C64713) is an enhancement to the AN21xx product families, please contact Cypress Technical Support if you have any questions with using AN21xx parts.

Datasheet for CY7C64713 is available at: http://www.cypress.com/?rID=14172