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.

...
Read more Read less

Filter

Visar 1 - 20 av 53 produkter
Resultat per sida
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 177-1720
Tillv. art.nrAT27C2048-55JU
VarumärkeMicrochip
41,91 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 192-1512
Tillv. art.nrDS2502S+
VarumärkeMaxim Integrated
23,772 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
RS-artikelnummer 127-6565
Tillv. art.nrAT27C512R-70JU
VarumärkeMicrochip
19,302 kr
Each (In a Pack of 5)
Enheter
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS-artikelnummer 177-1449
Tillv. art.nrAT27LV512A-90JU
VarumärkeMicrochip
20,835 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 127-4058
Tillv. art.nrAT27C020-55PU
VarumärkeMicrochip
31,94 kr
Each (In a Pack of 2)
Enheter
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS-artikelnummer 169-8319
Tillv. art.nrDS2505+
VarumärkeMaxim Integrated
22,365 kr
Each (In a Tube of 10)
Enheter
16kbit - - - - - - Through Hole TO-92 3 - 4.95mm - -
RS-artikelnummer 127-4048
Tillv. art.nrAT27C010-70JU
VarumärkeMicrochip
23,908 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 177-1855
Tillv. art.nrAT27LV512A-90JU
VarumärkeMicrochip
21,542 kr
Each (In a Pack of 5)
Enheter
512kbit 64K x 8 bit Parallel 90ns - 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 192-1254
Tillv. art.nrDS1982-F3+
VarumärkeMaxim Integrated
23,866 kr
Each (In a Bag of 100)
Enheter
1kbit - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm 3.1mm - -
RS-artikelnummer 127-6553
Tillv. art.nrAT27C1024-70JU
VarumärkeMicrochip
29,595 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 172-9358
Tillv. art.nrDS1982-F5+
VarumärkeMaxim Integrated
26,124 kr
Each (In a Tube of 100)
Enheter
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm 5.89mm - -
RS-artikelnummer 127-6564
Tillv. art.nrAT27C512R-45PU
VarumärkeMicrochip
21,03 kr
Each (In a Pack of 5)
Enheter
512kbit 64K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
RS-artikelnummer 169-8318
Tillv. art.nrDS2502+
VarumärkeMaxim Integrated
17,413 kr
Each (In a Tube of 10)
Enheter
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - -
RS-artikelnummer 127-4062
Tillv. art.nrAT27C020-90PU
VarumärkeMicrochip
31,67 kr
Each (In a Pack of 2)
Enheter
- - - - - - - - - - - - - -
RS-artikelnummer 177-1739
Tillv. art.nrAT27LV010A-70JU
VarumärkeMicrochip
22,164 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 127-6556
Tillv. art.nrAT27C256R-45JU
VarumärkeMicrochip
17,872 kr
Each (In a Pack of 5)
Enheter
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 127-6557
Tillv. art.nrAT27C256R-45PU
VarumärkeMicrochip
19,11 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 190-6082
Tillv. art.nrDS2502R+T&R
VarumärkeMaxim Integrated
11,258 kr
Each (On a Reel of 3000)
Enheter
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-artikelnummer 189-7490
Tillv. art.nrDS2505+
VarumärkeMaxim Integrated
16,379 kr
Each (In a Bag of 2000)
Enheter
16kbit - - - - - - Through Hole TO-92 3 - 4.95mm - -
RS-artikelnummer 127-6560
Tillv. art.nrAT27C4096-55JU
VarumärkeMicrochip
62,17 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 -
Related Products
The iButton is a computer chip enclosed in ...
Description:
The iButton is a computer chip enclosed in a 17mm diameter stainless steel can. Because of this unique and durable container, up-to-date information can travel with a person or object anywhere they go. It can be mounted anywhere because it ...
These EPROM (Erasable Programmable Read-Only Memory) devices contain ...
Description:
These EPROM (Erasable Programmable Read-Only Memory) devices contain the same chips and are programmed in the same way as their UV-eraseable counterparts. However as the package contains no window, they cannot be erased and re-programmed.
These EPROM (Erasable Programmable Read-Only Memory) devices contain ...
Description:
These EPROM (Erasable Programmable Read-Only Memory) devices contain the same chips and are programmed in the same way as their UV-eraseable counterparts. However as the package contains no window, they cannot be erased and re-programmed.
These EPROM (Erasable Programmable Read-Only Memory) devices contain ...
Description:
These EPROM (Erasable Programmable Read-Only Memory) devices contain the same chips and are programmed in the same way as their UV-eraseable counterparts. However as the package contains no window, they cannot be erased and re-programmed.