Basic Process Technology Types
- SRAM - based on static memory technology. In-system programmable and re-programmable. Requires external boot devices. CMOS. Currently in use.
- Antifuse - One-time programmable. CMOS.
- PROM - Programmable Read-Only Memory technology. One-time programmable because of plastic packaging. Obsolete.
- EPROM - Erasable Programmable Read-Only Memory technology. One-time programmable but with window, can be erased with ultraviolet (UV) light. CMOS. Obsolete.
- EEPROM - Electrically Erasable Programmable Read-Only Memory technology. Can be erased, even in plastic packages. Some but not all EEPROM devices can be in-system programmed. CMOS.
- Flash - Flash-erase EPROM technology. Can be erased, even in plastic packages. Some but not all flash devices can be in-system programmed. Usually, a flash cell is smaller than an equivalent EEPROM cell and is therefore less expensive to manufacture. CMOS.
- Fuse - One-time programmable. Bipolar. Obsolete.
Read more about this topic: Field-programmable Gate Array
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