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ROM, EPROM, and EEPROM Technology

OVERVIEWRead only memory devices are a special case of memory where, in normal system operation, thememory is read but not changed. Read only memories are non-volatile, that is, stored informa-tion is retained when the power is removed. The main read only memory devices are listed below:ROM (Mask Programmable ROM also called MROMs )EPROM (UV Erasable Programmable ROM)OTP (One Time Programmable EPROM) EEPROM (Electrically Erasable and Programmable ROM)Flash Memory - This device is covered in Section THE DEVICE WORKSThe read only memory cell usuallyconsists of a single transistor (ROMand EPROM cells consist of onetransistor, EEPROM cells consist ofone, one-and-a-half, or two transis-tors).

ROM, EPROM, & EEPROM Technology 9-8 INTEGRATED CIRCUIT ENGINEERING CORPORATION Source: ICE, "Memory 1997" 22453 Manufacturer Density Date Code Cell Size (µm2) Die Size (mm2) Min. Gate Length (µm) Atmel AMD ST ISSI 1Mbit 1Mbit 1Mbit 1Mbit 9428 9634 9514 94/95 4.40 5.52 3.60 6.80 14.6 15.9 11.5 18.0 0.6 0.7 0.5 0.7 Figure 9-9. EPROM …

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