‘Microprocessor microcircuits’, ‘microcomputer microcircuits’, microcontroller microcircuits, storage integrated circuits manufactured from a compound semiconductor, analogue-to-digital converters, integrated circuits that contain analogue-to-digital converters and store or process the digitized data, digital-to-analogue converters, electro-optical or ‘optical integrated circuits’ designed for ‘signal processing’, field programmable logic devices, custom integrated circuits for which either the function is unknown or the status of the equipment in which the integrated circuit will be used is unknown, Fast Fourier Transform (FFT) processors, Electrical Erasable Programmable Read-Only Memories (EEPROMs), flash memories, Static Random-Access Memories (SRAMs) or Magnetic Random-Access Memories (MRAMs), having any of the following: (a) Rated for operation at an ambient temperature above 398 K (+ 125 °C); (b) Rated for operation at an ambient temperature below 218 K (– 55 °C); or (c) Rated for operation over the entire ambient temperature range from 218 K (– 55 °C) to 398 K (+ 125 °C); Note : This category does not apply to integrated circuits for civil automobile or railway train applications.