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.
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Part Details Brand Memory Size Organisation Interface Type Maximum Random Access Time Programming Voltage In System Programmability Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage Number of Words Width Minimum Operating Supply Voltage Number of Bits per Word
Microchip Technology AT27LV010A-70JU, EPROM 1Mbit 128K x 8 bit 70ns 32-Pin PLCC Microchip Technology 1Mbit 128K x 8 bit Parallel 70ns - - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm 3.6 (Low Voltage) V, 5 (Standard) V 128K 11.5mm 3 (Low Voltage) V 8bit
Microchip Technology AT27LV512A-90JU, EPROM 512kbit 64K x 8 bit 90ns 32-Pin PLCC Microchip Technology 512kbit 64K x 8 bit Parallel 90ns 6.5V - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm 3.6 (Low Voltage) V, 5 (Standard) V 64K 11.5mm 3 (Low Voltage) V 8bit
Microchip Technology AT27C2048-55JU, EPROM 2Mbit 128K x 16 bit 55ns 44-Pin PLCC Microchip Technology 2Mbit 128K x 16 bit Parallel 55ns - - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm 5 V 128K 16.66mm - 16bit
Microchip Technology AT27C020-55PU, EPROM 2Mbit 256K x 8 bit 55ns 32-Pin PDIP Microchip Technology 2Mbit 256K x 8 bit - 55ns - - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm - 256K 13.97mm - 8bit
Microchip Technology AT27C2048-55JU, EPROM 2Mbit 128K x 16 bit 55ns 44-Pin PLCC Microchip Technology 2Mbit 128K x 16 bit Parallel 55ns - - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm 5 V 128K 16.66mm - 16bit
Microchip Technology AT27LV010A-70JU, EPROM 1Mbit 128K x 8 bit 70ns 32-Pin PLCC Microchip Technology 1Mbit 128K x 8 bit Parallel 70ns - - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm 3.6 (Low Voltage) V, 5 (Standard) V 128K 11.5mm 3 (Low Voltage) V 8bit
Microchip Technology AT27LV512A-90JU, EPROM 512kbit 64K x 8 bit 90ns 32-Pin PLCC Microchip Technology 512kbit 64K x 8 bit Parallel 90ns - - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm 3.6 (Low Voltage) V, 5 (Standard) V 64K 11.5mm 3 (Low Voltage) V 8bit
Microchip Technology AT27C256R-45JU, EPROM 256kbit 32K x 8 bit 45ns 32-Pin PLCC Microchip Technology 256kbit 32K x 8 bit - 45ns - - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm - 32K 11.5mm - 8bit
Maxim DS2505+, EPROM 16kbit 3-Pin TO-92 Maxim 16kbit - - - - - Through Hole TO-92 3 - 4.95mm - - - - - -
1KBit EPROM, 64-Bit Registration TSOC6 Maxim 1kbit - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - - - - - -
Maxim DS2502+, EPROM 1kbit 3-Pin TO-92 Maxim 1kbit - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm 3.94mm - - - - - -
Microchip Technology AT27C512R-70PU, EPROM 512kbit 64K x 8 bit 70ns 28-Pin PDIP Microchip Technology 512kbit 64K x 8 bit - 70ns - - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm - 64K 13.97mm - 8bit
Microchip Technology AT27C4096-90JU, EPROM 4Mbit 256K x 16 bit 90ns 44-Pin PLCC Microchip Technology 4Mbit 256K x 16 bit - 90ns - - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm - 256K 16.66mm - 16bit
Maxim DS2502P-E48+, EPROM 1024bit 6-Pin TSOC Maxim 1024bit - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm 1.5mm - - - - - -
Microchip Technology AT27C512R-45PU, EPROM 512kbit 64K x 8 bit 45ns 28-Pin PDIP Microchip Technology 512kbit 64K x 8 bit - 45ns - - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm - 64K 13.97mm - 8bit
Microchip Technology AT27C2048-90JU, EPROM 2Mbit 128K x 16 bit 90ns 44-Pin PLCC Microchip Technology 2Mbit 128K x 16 bit - 90ns - - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm 4.06mm 16.66mm - 128K 16.66mm - 16bit
Microchip Technology AT27C010-70PU, EPROM 1Mbit 128K x 8 bit 70ns 32-Pin PDIP Microchip Technology 1Mbit 128K x 8 bit - 70ns - - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm 4.44mm 42.29mm - 128K 13.97mm - 8bit
Microchip Technology AT27C256R-70PU, EPROM 256kbit 32K x 8 bit 70ns 28-Pin PDIP Microchip Technology 256kbit 32K x 8 bit - 70ns - - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm 4.44mm 37.33mm - 32K 13.97mm - 8bit
Microchip Technology AT27C040-90JU, EPROM 4Mbit 512K x 8 bit 90ns 32-Pin PLCC Microchip Technology 4Mbit 512K x 8 bit - 90ns - - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm - 512K 11.5mm - 8bit
Microchip AT27C020-90JU, EPROM 2Mbit 256K x 8 bit 90ns 32-Pin PLCC Microchip 2Mbit 256K x 8 bit - 90ns - - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm 3.17mm 14.04mm - 256K 11.5mm - 8bit
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