EPROM

What is EPROM?
EPROM stands for erasable programmable read only memory and is a type of solid state memory chip that retains its memory contents without the help of a power supply.
The basic transistor device in an EPROM is different from the normal MOS transistor. A floating gate avalanche injection MOS transistor is used. There are two gates to this MOS transistor. One is a floating gate, meaning that it has no electrical connection to that gate.
Types of solid state memory available with different desirable characteristics:
ROM
Read Only Memory, non-volatile (memory contents are retained even without the help of a power supply), are low power and high density.
RAM
Random Access Memory is volatile.
PROM
Programmable ROM allows you to write your own content or program. It cannot be erased so you can only program it once.
EPROM
You can erase whatever you have programmed and can reprogram it thus allowing it to be reused. It can be erased with ultra violet (UV) light which basically means that you have to take the chip out from the circuit and expose the memory chip to UV lights. These memory chips come with a particular package which enables this to happen. Standard room lighting cannot be used to erase the chip as it does not have enough UV light, however bright sunlight can cause erasure therefore this is why the window is protected with a label. There is a glass window on top which you can expose these memory cells to UV light. Once this happens the electrons which are in the floating gate, get excited because of the high energy they acquire and they overcome the silicon dioxide barrier and move over to the silicon substrate or the control gate and once they do this you are reducing the threshold voltage. This can take up to 30 minutes in which you have to expose it to UV light, after which the electrons move out from the floating gate and then it is ready for reprogramming.
Disadvantages of EPROM is that it takes time to erase the entire content. You don’t have control over which bits you want erased.
Differences between EPROM and EEPROM
EEPROM (electrically erasable programmable ROM) can be erased electrically and can be reprogrammed. The device it uses is called FLOTOX (Floating Gate Tunnelling Oxide) MOS. It is more flexible than EPROM, for example you can erase a single bit of memory internally at a time without removing the chip. There are also two transistors per cell instead of one so the density of an EEPROM is slightly less compared to the normal EPROM.

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Omschrijving Prijs Memory Size Organisation Interface Type Maximum Random Access Time Programming Voltage Reprogramming Technique In System Programmability Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage
RS-stocknr. 127-6545
FabrikantnummerAT27C040-70JU
FabrikantMicrochip
€ 4,43
Each (In a Pack of 2)
Aantal stuks
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-stocknr. 190-6081
FabrikantnummerDS2502P-E48+T&R
FabrikantMaxim Integrated
€ 1,589
Each (On a Reel of 4000)
Aantal stuks
1024bit - 1-Wire - - OTP - Surface Mount TSOC 6 4 x 3.89 x 1.34mm 1.34mm 4mm 6 V
RS-stocknr. 127-6566
FabrikantnummerAT27C512R-70PU
FabrikantMicrochip
€ 2,068
Each (In a Pack of 5)
Aantal stuks
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
RS-stocknr. 172-9358
FabrikantnummerDS1982-F5+
FabrikantMaxim Integrated
€ 2,527
Each (In a Tube of 100)
Aantal stuks
- - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm 5.89mm - -
RS-stocknr. 786-0818
FabrikantnummerDS2502P+
FabrikantMaxim Integrated
€ 2,112
Each (In a Pack of 5)
Aantal stuks
1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS-stocknr. 169-8318
FabrikantnummerDS2502+
FabrikantMaxim Integrated
€ 1,769
Each (In a Tube of 10)
Aantal stuks
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - -
RS-stocknr. 127-6548
FabrikantnummerAT27C040-90PU
FabrikantMicrochip
€ 4,57
Each (In a Pack of 2)
Aantal stuks
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-stocknr. 177-1447
FabrikantnummerAT27C2048-55JU
FabrikantMicrochip
€ 4,065
Each (In a Tube of 27)
Aantal stuks
2Mbit 128K x 16 bit Parallel 55ns - OTP - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm 5 V
RS-stocknr. 127-6555
FabrikantnummerAT27C2048-90JU
FabrikantMicrochip
€ 3,21
Each (In a Pack of 2)
Aantal stuks
2Mbit 128K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS-stocknr. 127-6558
FabrikantnummerAT27C256R-70JU
FabrikantMicrochip
€ 1,744
Each (In a Pack of 5)
Aantal stuks
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-stocknr. 190-6082
FabrikantnummerDS2502R+T&R
FabrikantMaxim Integrated
€ 1,047
Each (On a Reel of 3000)
Aantal stuks
1kbit - 1-Wire - 12 V @ 10 mA - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 1.02mm 3.04mm 6 V
RS-stocknr. 127-6565
FabrikantnummerAT27C512R-70JU
FabrikantMicrochip
€ 1,954
Each (In a Pack of 5)
Aantal stuks
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-stocknr. 127-6564
FabrikantnummerAT27C512R-45PU
FabrikantMicrochip
€ 2,126
Each (In a Pack of 5)
Aantal stuks
512kbit 64K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
RS-stocknr. 177-1448
FabrikantnummerAT27LV010A-70JU
FabrikantMicrochip
€ 2,561
Each (In a Tube of 32)
Aantal stuks
1Mbit 128K x 8 bit Parallel 70ns - OTP - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm 3.6 (Low Voltage) V, 5 (Standard) V
RS-stocknr. 192-1512
FabrikantnummerDS2502S+
FabrikantMaxim Integrated
€ 2,39
Each (In a Pack of 5)
Aantal stuks
1kbit 1K x 1 bit 1-Wire 120µs 11.5V OTP In System Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 6 V
RS-stocknr. 127-4058
FabrikantnummerAT27C020-55PU
FabrikantMicrochip
€ 3,225
Each (In a Pack of 2)
Aantal stuks
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-stocknr. 137-519
FabrikantnummerDS1982-F3+
FabrikantMaxim Integrated
€ 3,03
Each
Aantal stuks
- - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm 3.1mm - -
RS-stocknr. 127-6550
FabrikantnummerAT27C080-90PU
FabrikantMicrochip
€ 9,91
Each
Aantal stuks
8Mbit 1M x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-stocknr. 146-1071
FabrikantnummerDS2502P+
FabrikantMaxim Integrated
€ 1,67
Each (In a Tube of 120)
Aantal stuks
1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS-stocknr. 127-6557
FabrikantnummerAT27C256R-45PU
FabrikantMicrochip
€ 1,918
Each (In a Pack of 5)
Aantal stuks
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
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