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.

...
อ่านเพิ่มเติม อ่านน้อยกว่า

คัดกรอง / Filters

กำลังดูสินค้า 1 - 20 รายการจาก 50 รายการ / Viewing 1 - 20 of 50 products
ผลการค้นหาต่อหน้า / Results Per Page
รายละเอียดสินค้า / Description ราคา / 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. 190-6081
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS2502P-E48+T&R
THB57.517
Each (On a Reel of 4000)
Units
1024bit - 1-Wire - - OTP - Surface Mount TSOC 6 4 x 3.89 x 1.34mm 1.34mm 4mm 6 V
RS Stock No. 127-6545
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C040-70JU
Brand :Microchip
THB142.53
Each: (In a Pack of 2)
Units
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS Stock No. 540-4845
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS2505+
THB88.48
Each
Units
16kbit - - - - - - Through Hole TO-92 3 - 4.95mm - -
RS Stock No. 127-6554
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C1024-70PU
Brand :Microchip
THB100.765
Each: (In a Pack of 2)
Units
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm 4.44mm 52.57mm -
RS Stock No. 127-6562
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C4096-90PU
Brand :Microchip
THB204.09
Each
Units
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm 4.44mm 52.57mm -
RS Stock No. 127-4048
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C010-70JU
Brand :Microchip
THB79.032
Each: (In a Pack of 5)
Units
1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS Stock No. 127-6546
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C040-70PU
Brand :Microchip
THB147.78
Each: (In a Pack of 2)
Units
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm -
RS Stock No. 127-4051
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C020-55JU
Brand :Microchip
THB111.005
Each: (In a Pack of 2)
Units
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS Stock No. 127-6565
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C512R-70JU
Brand :Microchip
THB62.50
Each: (In a Pack of 5)
Units
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS Stock No. 190-6965
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS2502P-E48+T&R
THB83.856
Each: (In a Pack of 5)
Units
- - 1-Wire - - OTP - Surface Mount TSOC - - - - 6 V
RS Stock No. 190-6082
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS2502R+T&R
THB48.807
Each (On a Reel of 3000)
Units
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 Stock No. 127-4062
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C020-90PU
Brand :Microchip
THB101.05
Each: (In a Pack of 2)
Units
- - - - - - - - - - - - - -
RS Stock No. 172-9358
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS1982-F5+
THB82.945
Each (In a Tube of 100)
Units
- - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm 5.89mm - -
RS Stock No. 127-6552
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C1024-45PU
Brand :Microchip
THB102.515
Each: (In a Pack of 2)
Units
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm 4.44mm 52.57mm -
RS Stock No. 127-6553
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C1024-70JU
Brand :Microchip
THB102.855
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. 127-6556
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C256R-45JU
Brand :Microchip
THB57.826
Each: (In a Pack of 5)
Units
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm -
RS Stock No. 127-6564
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C512R-45PU
Brand :Microchip
THB71.586
Each: (In a Pack of 5)
Units
512kbit 64K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
RS Stock No. 190-6989
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS2502R+T&R
THB70.52
Each: (In a Pack of 5)
Units
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 Stock No. 169-8318
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS2502+
THB61.352
Each (In a Tube of 10)
Units
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - -
RS Stock No. 127-6566
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.AT27C512R-70PU
Brand :Microchip
THB66.30
Each: (In a Pack of 5)
Units
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm -
Related Products
Elegant aluminium trunking for all tertiary building applications.Simple ...
Description:
Elegant aluminium trunking for all tertiary building applications.Simple and easy to use, the same trunking can be fitted on the skirting or window breast.Mosaic® 45 devices simply clip on. The Normaclip locks into place and prevents Mosaic® 45 modules from ...
Completely conforming to I²C BUSWide operating voltage range:1.7 ...
Description:
Completely conforming to I²C BUSWide operating voltage range:1.7 to 5.5VData rewrite up to 1,000,000timesApplications:Portable Data TerminalCoin Processing MachinesMeter for Medical Treatments PortableBarcode ScannerDigital Multimeter: Handy TypeDigital StethoscopeSingle Board ComputerNetwork Attached StorageX-ray ...
The Microchip 11AAxxx/11LCxxx family of devices are Serial ...
Description:
The Microchip 11AAxxx/11LCxxx family of devices are Serial EEPROMs featuring Microchip’s proprietary UNI/O™ Serial Bus.UNI/O™ Serial EEPROM devices require only one connection to a host Microcontroller as clock and data communications are combined into a single serial bit stream. The ...
NVRAMs are modules containing a CMOS static RAM ...
Description:
NVRAMs are modules containing a CMOS static RAM and a non-rechargeable Lithium battery to maintain the data when the power supply is removed. Some devices in the range also incorporate a real-time clock (RTC).