EPROM vs EEPROM vs Flash EPROM-Difference between EPROM types
This page on EPROM vs EEPROM vs Flash EPROM dscribes difference between various EPROM types such as EPROM, EEPROM and Flash EPROM.
EPROM stands for Erasable Programmable Read Only Memory. EEPROM stands for Electrically Erasable PROM. All these are re-programmable type of memories which are commonly used in processor based systems.
Like EPROMs, an EEPROM device is programmed by applying a high voltage on the control gate. Refer RAM vs ROM.
| Specifications | EPROM | EEPROM | Flash EPROM |
|---|---|---|---|
| Relative Size of Cell | 1 | 3 | 1.2 to 1.3 |
| Programming | By external Means | Internal | Internal |
| Technique | Hot electron injection | Tunnel effect | Hot electron injection |
| Voltage | 12.5 V | 5 V | 12 V |
| Resolution | Byte | Byte | Byte |
| Time taken | < 100 µS | 5 ms | < 10 µS |
| Erasing Type | By external means | Internal | Internal |
| Technique | Ultraviolet light | Tunnel effect | Tunnel effect |
| Resolution | Whole chip | Byte | Whole chip or block |
| Time Taken | 15 min | 5 ms | 1 sec |
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