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:ROMRead Only Memory, non-volatile (memory contents are retained even without the help of a power supply), are low power and high density.RAMRandom Access Memory is volatile.PROMProgrammable ROM allows you to write your own content or program. It cannot be erased so you can only program it once. EPROMYou 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 dont have control over which bits you want erased.Differences between EPROM and EEPROMEEPROM (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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Beskrivning Pris 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-artikelnummer 127-6545
Tillv. art.nrAT27C040-70JU
VarumärkeMicrochip
45,805 kr
Each (In a Pack of 2)
Enheter
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-artikelnummer 786-0818
Tillv. art.nrDS2502P+
VarumärkeMaxim Integrated
21,838 kr
Each (In a Pack of 5)
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1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS-artikelnummer 127-6550
Tillv. art.nrAT27C080-90PU
VarumärkeMicrochip
102,47 kr
Each
Enheter
8Mbit 1M x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-artikelnummer 127-6561
Tillv. art.nrAT27C4096-90JU
VarumärkeMicrochip
64,00 kr
Each
Enheter
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS-artikelnummer 540-4845
Tillv. art.nrDS2505+
VarumärkeMaxim Integrated
26,26 kr
Each
Enheter
16kbit - - - - - - Through Hole TO-92 3 - 4.95mm - -
RS-artikelnummer 127-4048
Tillv. art.nrAT27C010-70JU
VarumärkeMicrochip
24,836 kr
Each (In a Pack of 5)
Enheter
1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-artikelnummer 127-6546
Tillv. art.nrAT27C040-70PU
VarumärkeMicrochip
47,51 kr
Each (In a Pack of 2)
Enheter
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-artikelnummer 192-1512
Tillv. art.nrDS2502S+
VarumärkeMaxim Integrated
24,712 kr
Each (In a Pack of 5)
Enheter
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
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RS-artikelnummer 190-6989
Tillv. art.nrDS2502R+T&R
VarumärkeMaxim Integrated
17,102 kr
Each (In a Pack of 5)
Enheter
- - - - - - - - - - - - - -
RS-artikelnummer 172-9358
Tillv. art.nrDS1982-F5+
VarumärkeMaxim Integrated
26,124 kr
Each (In a Tube of 100)
Enheter
- - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm 5.89mm - -
RS-artikelnummer 192-1255
Tillv. art.nrDS2502S+
VarumärkeMaxim Integrated
19,474 kr
Each (In a Tube of 100)
Enheter
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-artikelnummer 177-1739
Tillv. art.nrAT27LV010A-70JU
VarumärkeMicrochip
27,422 kr
Each (In a Pack of 5)
Enheter
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-artikelnummer 127-6560
Tillv. art.nrAT27C4096-55JU
VarumärkeMicrochip
64,73 kr
Each
Enheter
4Mbit 256K x 16 bit - 55ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS-artikelnummer 127-4047
Tillv. art.nrAT27C010-45JU
VarumärkeMicrochip
25,396 kr
Each (In a Pack of 5)
Enheter
1Mbit 128K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-artikelnummer 127-6551
Tillv. art.nrAT27C1024-45JU
VarumärkeMicrochip
31,485 kr
Each (In a Pack of 2)
Enheter
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS-artikelnummer 127-6552
Tillv. art.nrAT27C1024-45PU
VarumärkeMicrochip
32,985 kr
Each (In a Pack of 2)
Enheter
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm 4.44mm 52.57mm -
RS-artikelnummer 137-519
Tillv. art.nrDS1982-F3+
VarumärkeMaxim Integrated
31,33 kr
Each
Enheter
- - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm 3.1mm - -
RS-artikelnummer 127-6555
Tillv. art.nrAT27C2048-90JU
VarumärkeMicrochip
34,01 kr
Each (In a Pack of 2)
Enheter
2Mbit 128K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
RS-artikelnummer 177-1449
Tillv. art.nrAT27LV512A-90JU
VarumärkeMicrochip
21,614 kr
Each (In a Tube of 32)
Enheter
512kbit 64K x 8 bit Parallel 90ns 6.5V 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-artikelnummer 127-6553
Tillv. art.nrAT27C1024-70JU
VarumärkeMicrochip
30,865 kr
Each (In a Pack of 2)
Enheter
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm -
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