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Transceiver ICs 

Thanks to Microchip's high level of integration, you can design bidirectional remote control and access control systems with fast challenge-response crypto functionality, using the same PCB board size and with the same current consumption as unidirectional remote control systems.

Device Description
ATA5428 UHF ASK/FSK Transceiver 433 and 868MHz
ATA8510 Sub-1GHz RF Transceiver with embedded AVR microcontroller (additional Flash Option)
ATA8515 Sub-1GHz RF Transceiver with embedded AVR microcontroller