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 732-7563
Tillv. art.nrDS2502P-E48+
VarumärkeMaxim Integrated
27,61 kr
Each
Enheter
1024bit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS-artikelnummer 103-9913
Tillv. art.nrDS2502P-E48+
VarumärkeMaxim Integrated
20,733 kr
Each (In a Tube of 120)
Enheter
1024bit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS-artikelnummer 786-0818
Tillv. art.nrDS2502P+
VarumärkeMaxim Integrated
12,684 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 540-4839
Tillv. art.nrDS2502+
VarumärkeMaxim Integrated
20,16 kr
Each
Enheter
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - -
RS-artikelnummer 169-8318
Tillv. art.nrDS2502+
VarumärkeMaxim Integrated
18,167 kr
Each (In a Tube of 10)
Enheter
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - -
RS-artikelnummer 146-1071
Tillv. art.nrDS2502P+
VarumärkeMaxim Integrated
12,464 kr
Each (In a Tube of 120)
Enheter
1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - -
RS-artikelnummer 127-6547
Tillv. art.nrAT27C040-90JU
VarumärkeMicrochip
44,98 kr
Each (In a Pack of 2)
Enheter
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-artikelnummer 127-6557
Tillv. art.nrAT27C256R-45PU
VarumärkeMicrochip
20,204 kr
Each (In a Pack of 5)
Enheter
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
RS-artikelnummer 172-9358
Tillv. art.nrDS1982-F5+
VarumärkeMaxim Integrated
26,083 kr
Each (In a Tube of 100)
Enheter
- - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm 5.89mm - -
RS-artikelnummer 127-6551
Tillv. art.nrAT27C1024-45JU
VarumärkeMicrochip
31,07 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
33,14 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 177-1447
Tillv. art.nrAT27C2048-55JU
VarumärkeMicrochip
41,502 kr
Each (In a Tube of 27)
Enheter
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
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RS-artikelnummer 192-1488
Tillv. art.nrDS1982-F3+
VarumärkeMaxim Integrated
35,465 kr
Each (In a Pack of 2)
Enheter
- - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm 3.1mm - -
RS-artikelnummer 540-4845
Tillv. art.nrDS2505+
VarumärkeMaxim Integrated
26,06 kr
Each
Enheter
16kbit - - - - - - Through Hole TO-92 3 - 4.95mm - -
RS-artikelnummer 127-6553
Tillv. art.nrAT27C1024-70JU
VarumärkeMicrochip
30,45 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 -
RS-artikelnummer 177-1448
Tillv. art.nrAT27LV010A-70JU
VarumärkeMicrochip
26,147 kr
Each (In a Tube of 32)
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 177-1720
Tillv. art.nrAT27C2048-55JU
VarumärkeMicrochip
43,065 kr
Each (In a Pack of 2)
Enheter
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-artikelnummer 127-6566
Tillv. art.nrAT27C512R-70PU
VarumärkeMicrochip
20,99 kr
Each (In a Pack of 5)
Enheter
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
RS-artikelnummer 127-6559
Tillv. art.nrAT27C256R-70PU
VarumärkeMicrochip
20,638 kr
Each (In a Pack of 5)
Enheter
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
RS-artikelnummer 127-6546
Tillv. art.nrAT27C040-70PU
VarumärkeMicrochip
48,34 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 -
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