200 C High Temp. design.

I am looking for microcontroller system ( MCU ,EPROM , FLASH , RAM, Gate Arrays ) capable of above 200 C operational ( for downhole equipment ) . So far I have foud Honeywell's HTMOS series but cannot find any EPROm , PROM or RTC parts. Does anybody know another MCU manufacturer for >200C applications ?

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Radim Stepanik
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