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 127-6547
Tillv. art.nrAT27C040-90JU
VarumärkeMicrochip
44,98 kr
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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 127-6559
Tillv. art.nrAT27C256R-70PU
VarumärkeMicrochip
20,638 kr
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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 127-6552
Tillv. art.nrAT27C1024-45PU
VarumärkeMicrochip
33,14 kr
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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
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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 177-1448
Tillv. art.nrAT27LV010A-70JU
VarumärkeMicrochip
26,147 kr
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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 127-6566
Tillv. art.nrAT27C512R-70PU
VarumärkeMicrochip
20,99 kr
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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 127-4051
Tillv. art.nrAT27C020-55JU
VarumärkeMicrochip
31,175 kr
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2Mbit 256K x 8 bit - 55ns - 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
48,34 kr
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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 127-6551
Tillv. art.nrAT27C1024-45JU
VarumärkeMicrochip
31,07 kr
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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 127-6548
Tillv. art.nrAT27C040-90PU
VarumärkeMicrochip
46,635 kr
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4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-artikelnummer 127-6556
Tillv. art.nrAT27C256R-45JU
VarumärkeMicrochip
18,344 kr
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256kbit 32K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-artikelnummer 127-6555
Tillv. art.nrAT27C2048-90JU
VarumärkeMicrochip
26,595 kr
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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 127-6553
Tillv. art.nrAT27C1024-70JU
VarumärkeMicrochip
30,45 kr
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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 177-1449
Tillv. art.nrAT27LV512A-90JU
VarumärkeMicrochip
21,349 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 127-4062
Tillv. art.nrAT27C020-90PU
VarumärkeMicrochip
33,09 kr
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RS-artikelnummer 127-4048
Tillv. art.nrAT27C010-70JU
VarumärkeMicrochip
24,588 kr
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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 127-6561
Tillv. art.nrAT27C4096-90JU
VarumärkeMicrochip
63,07 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 127-6558
Tillv. art.nrAT27C256R-70JU
VarumärkeMicrochip
17,868 kr
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Enheter
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-artikelnummer 127-4049
Tillv. art.nrAT27C010-70PU
VarumärkeMicrochip
26,656 kr
Each (In a Pack of 5)
Enheter
1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-artikelnummer 127-6550
Tillv. art.nrAT27C080-90PU
VarumärkeMicrochip
101,23 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 -