EPROM is generally erased by using

Q. EPROM is generally erased by using

1. ultraviolet rays
2. infrared rays
3. 12v electrical pulse
4. 24v electrical pulse
5. none of these

Answer: Ultraviolet Rays

Q. The information in 'EEPROM' is erased by using ______

1. Electrons
2. UV-rays
3. Electrical Signals
4. Digital Signals

Answer: Electrical Signals

EPROM

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An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of memory chip that retains its data when its power supply is switched off. Computer memory that can retrieve stored data after a power supply has been turned off and back on is called non-volatile. It is an array of floating-gate transistors individually programmed by an electronic device that supplies higher voltages than those normally used in digital circuits. Once programmed, an EPROM can be erased by exposing it to a strong ultraviolet light source (such as from a mercury-vapor light). EPROMs are easily recognizable by the transparent fused quartz window in the top of the package, through which the silicon chip is visible, and which permits exposure to ultraviolet light during erasing.

EEPROM

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EEPROM (also E²PROM) stands for Electrically Erasable Programmable Read-Only Memory and is a type of non-volatile memory used in computers, integrated into microcontrollers for smart cards and remote keyless system, and other electronic devices to store relatively small amounts of data but allowing individual bytes to be erased and reprogrammed.

EEPROMs are organized as arrays of floating-gate transistors. EEPROMs can be programmed and erased in-circuit, by applying special programming signals. Originally, EEPROMs were limited to single byte operations which made them slower, but modern EEPROMs allow multi-byte page operations. It also has a limited life for erasing and reprogramming, now reaching a million operations in modern EEPROMs. In an EEPROM that is frequently reprogrammed while the computer is in use, the life of the EEPROM is an important design consideration.

Unlike most other kinds of non-volatile memory, an EEPROM typically allows a byte (or a word) to be erased, and re-written individually, while typical flash memory erases some region in the device at once.