Difference between PROM and EPROM
These two data storage methods were utilized before for SD cards and hard disk drives. However, there are some main differences between these data storages. A written type of ROM is called PROM, and the user writes this memory only once, and it is electrically programmed at that time. EPROM is a form of ROM that may be read and written. EPROM storage durability is lower than PROM storage permanence because it is more vulnerable to electrical noise and radiation.
In this article, you will learn about the difference between PROM and EPROM. But before discussing the differences, you must know about PROM and EPROM.
What is PROM?
The term PROM stands for Programmable Read-Only Memory. PROM was designed to fulfil the need for a collection of ROMs that may hold a specific memory content. The PROM memory is only written once and is electronically configured by the user either during or after the original chip manufacture. The user supplies the necessary content file and then inserts it into the machine known as the ROM programmer.
The PROM is built using bipolar transistors, which need much power but work very quickly. It has excellent storing stability, which means that the bits don't change until the PROM is reconnected to the programmer and additional fuses are blown. PROM is beneficial when created on a large scale and offers convenience and flexibility.
Advantages and Disadvantages of PROM
There are various advantages and disadvantages of PROM. Some main advantages and disadvantages of PROM are as follows:
What is EPROM?
EPROM stands for Erasable Programmable Read Only Memory, which is read and written optically (electrically). In order to write an EPROM, the storage cells must stay in their initial state. Therefore, the packed chip is exposed to ultraviolet radiation to remove the storage cells before performing the write operation.
The erasure technique is repeated many times, and a one-time erasure might take up to 20 minutes. EPROM has less storage durability than PROM because it is susceptible to electrical noise and radiation. The EPROM may be reprogrammed up to 1,000 times before it loses reliability. It has a quartz window that surpasses UV light.
The MOS transistor is a programmable element used in EPROM. A floating gate surrounded by an insulator makes up the transistor. The EPROM channel produces negative charges between the drain and source and keeps logic 1. The negative charges shift out from the channel due to the high voltage at the gate, and then these charges are caught in the floating gate and kept logic 0. When the floating gate surface is exposed to UV light, the negative charges from the floating gate are transferred back to the channel and restored logic 1. This phenomenon is referred to as hot electron injection.
Advantages and Disadvantages of EPROM
There are various advantages and disadvantages of EPROM. Some main advantages and disadvantages of EPROM are as follows:
Main Differences between the PROM and EPROM
Here, you will learn the main differences between PROM and EPROM. Some main differences between PROM and EPROM are as follows:
Head-to-head comparison between the PROM and EPROM
Here, you will learn the head-to-head comparisons between the PROM and the EPROM. The main differences between the PROM and the EPROM are as follows:
In summary, the PROM is less expensive than the EPROM, but it can only be programmed once, whereas the EPROM can be programmed several times, but the chip must be taken out of the system to remove the data.
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