What chips are used as interfaces with micro in RFID 13.5Mhz readers/writers ?

Does anyone know what chips are used as interfaces with micro in 13.5Mhz RFID readers/writers?
As an analog for U2270B (125KHz)?
Thanks

Texas Instrument RI-R6C-001A from Texas Instrument is a multiplatform for 13.56MHz. Check it out.....
:D

At 13.56Mhz Mifare reader rfid moduls are avaliable in link:
http://www.sonmicro.com/tr/1356/info1356.php