Memory ROM, PROM, EEPROM Mano and Kime Section 6-6.
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Transcript of Memory ROM, PROM, EEPROM Mano and Kime Section 6-6.
MemoryROM, 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
• 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
10
11
12
8
19
20
17
18
15
16
13
14
21
22
23
24
GND
Vcc
A0
D0
D1
D2
D7
D6
D5
D4
D3
A10
A1
A2
A3
A4
A5
A6
A7
A9
A8
Vpp A11
2716 2732
__OE Vpp
__OE /
CE__
EPROM
27xx EPROM PinoutsVpp
2764 27128 27256 27512 27512 27256 27128 2764
Vpp Vpp A15
A14 A14 PGM ____
PGM ____
NC A13 A13 A13
__OE Vpp
__OE /
__OE
__OE
1
2
3
4
5
6
7
9
10
11
12
8
19
20
17
18
15
1613
14
21
22
23
24
25
26
27
28
GND
Vcc
A12
A0
D0
D1D2
A1
A2
A3
A4
A5
A6
A7
D7
D6
D5D4
D3
A10
A9
A8
A11
EPROM
CE__
Xicor X28C010 128K x 8 E2PROM
Xicor X28C010 128K x 8 E2PROM
10 ms