The ATA5771/ATA5773/ATA5774 is a single key fob IC containing the AVR microcontroller ATtiny44V and the UHF PLL transmitters T5750/53/54 build-up using a stacked die technique supplied in a QFN24 5 mm x 5 mm package. These devices have been specially developed for the demands of RF low-cost data transmission systems with data rates of up to 32 kBit/s. Its main applications are in the areas of Remote Keyless-Entry (RKE), Passive Entry Go (PEG), and Remote Start. It can be used in the frequency range of f 0 = 3 10 MHz to 350 MHz, f 0 = 4 29 MHz to 439 MHz or f0 = 868 MHz to 928 MHz for ASK or FSK data transmission. 9137ARKE10/08