A real time functional replicator (10) of a specific integrated circuit comprised of a processing unit and peripherals in order to perform specific digital and/or analog functions controlled by specific software, this specific integrated circuit being designed to be incorporated into a specified application board. Such a device includes a processing module (12) that is functionally identical to the processing unit of the specific integrated circuit, a plurality of peripheral modules (14, 16, 18) each able to implement one or more digital and/or analog functions, each of the functions being able to be selected separately, and function interconnection means (20) for establishing the connections between the processing module and one ore more digital and/or analog functions located in at least one of the peripheral modules which are identical to the specific functions of the specific integrated circuit, such that the replicator behaves identically to the specific integrated circuit when the specific software is run.