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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Description Price 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 Stock No. 540-4845
Mfr. Part No.DS2505+
BrandMaxim
£2.00
Each
Units
16kbit - - - - - - Through Hole TO-92 3 - 4.95mm - -
RS Stock No. 169-8319
Mfr. Part No.DS2505+
BrandMaxim
£1.82
Each (In a Tube of 10)
Units
16kbit - - - - - - Through Hole TO-92 3 - 4.95mm - -
RS Stock No. 696-2951
Mfr. Part No.AT27C020-90JU
BrandAtmel
£1.67
Each
Units
2Mbit 256K x 8 bit Parallel 90ns 13V OTP External Surface Mount PLCC 32 14 x 11.5 x 2.8mm 2.8mm 14mm 5.5 V
RS Stock No. 165-9519
Mfr. Part No.DS2502S+
BrandMaxim
£2.32
Each (In a Tube of 100)
Units
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 Stock No. 797-9704
Mfr. Part No.DS2502S+
BrandMaxim
£2.32
Each (In a Pack of 2)
Units
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 Stock No. 137-519
Mfr. Part No.DS1982-F3+
BrandMaxim
£2.88
Each
Units
- - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm 3.1mm - -
RS Stock No. 540-4839
Mfr. Part No.DS2502+
BrandMaxim
£1.54
Each
Units
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - -
RS Stock No. 169-8318
Mfr. Part No.DS2502+
BrandMaxim
£1.396
Each (In a Tube of 10)
Units
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - -
RS Stock No. 172-9358
Mfr. Part No.DS1982-F5+
BrandMaxim
£1.982
Each (In a Tube of 100)
Units
- - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm 5.89mm - -
RS Stock No. 732-7563
Mfr. Part No.DS2502P-E48+
BrandMaxim
£1.96
Each
Units
1024bit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS Stock No. 103-9913
Mfr. Part No.DS2502P-E48+
BrandMaxim
£1.827
Each (In a Tube of 120)
Units
1024bit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS Stock No. 137-698
Mfr. Part No.DS1982-F5+
BrandMaxim
£2.62
Each
Units
- - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm 5.89mm - -
RS Stock No. 786-0818
Mfr. Part No.DS2502P+
BrandMaxim
£2.032
Each (In a Pack of 5)
Units
1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS Stock No. 146-1071
Mfr. Part No.DS2502P+
BrandMaxim
£2.033
Each (In a Tube of 120)
Units
1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS Stock No. 127-6558
Mfr. Part No.AT27C256R-70JU
£1.756
Each (In a Pack of 5)
Units
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS Stock No. 127-6551
Mfr. Part No.AT27C1024-45JU
£3.115
Each (In a Pack of 2)
Units
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS Stock No. 127-6553
Mfr. Part No.AT27C1024-70JU
£3.055
Each (In a Pack of 2)
Units
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS Stock No. 127-4058
Mfr. Part No.AT27C020-55PU
£3.14
Each (In a Pack of 2)
Units
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS Stock No. 127-6555
Mfr. Part No.AT27C2048-90JU
£2.22
Each (In a Pack of 2)
Units
2Mbit 128K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS Stock No. 127-6561
Mfr. Part No.AT27C4096-90JU
£3.32
Each
Units
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
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