Memory ROM, PROM, EEPROM
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Memory ROM, PROM, EEPROM Mano and Kime Section 6-6
description
Memory ROM, PROM, EEPROM. Mano and Kime Section 6-6. Read-Only Memory. An example of implementing a function using a ROM. EPROMs, EEPROMs and Flash Memory. EPROM Erasable Programmable Read-Only Memory Erase with ultraviolet light EEPROM Electrically-Erasable Programmable Read-Only Memory - PowerPoint PPT Presentation
Transcript of Memory ROM, PROM, EEPROM
MemoryROM, PROM, EEPROM
Mano and KimeSection 6-6
Read-Only Memory
An example of implementing a function using a ROM
EPROMs, EEPROMs and Flash Memory
• EPROM– Erasable Programmable Read-Only Memory– Erase with ultraviolet light
• EEPROM– Electrically-Erasable Programmable Read-Only
Memory• Flash Memory
– Electrically-Erasable in bulk
Floating-gate avalanche MOS
Programming Erasing
EPROMs
Table 8.2Common EPROMs
Number Size2716 2K x 82732 4K x 82764 8K x 827128 16K x 827256 32K x 827512 64K x 8
27xx EPROM Pinouts1 2 3 4 5 6 7
9 101112
8
1920
1718
1516
1314
21222324
GND
Vcc
A0D0D1D2
D7D6D5D4D3
A10 A1A2A3A4A5A6A7
A9A8
Vpp A11
2716 2732
__OE Vpp
__OE /
CE__
EPROM
27xx EPROM PinoutsVpp
2764 27128 27256 27512 27512 27256 27128 2764Vpp Vpp A15
A14 A14 PGM ____
PGM ____
NC A13 A13 A13
__OE Vpp __OE /__OE __OE
1 2 3 4 5 6 7
9 101112
8
1920
1718
151613
14
2122232425262728
GND
Vcc A12
A0D0D1D2
A1A2A3A4A5A6A7
D7D6D5D4D3
A10
A9A8
A11
EPROM
CE__
Xicor X28C010 128K x 8 E2PROM
Xicor X28C010 128K x 8 E2PROM
10 ms
