PROM和EPROM的区别

PROM代表Programmable Read Only Memory是只读的 ROM 类型。它旨在满足一组可能包含选定存储器内容的 ROM 的要求。它的内存只写入一次，并由用户在当时或初始芯片制造时进行电编程。所需的内容文件由用户配备并插入到称为存储编码器的机器中。每个可编程关联都有一个保险丝，一旦不需要关联，它就会熔断。

EPROM代表Erasable Programmable Read Only Memory ，也是以光学方式读写的 ROM 类型。要写入关联 EPROM，其存储单元应保持在相同的初始状态。与 PROM 相比，EPROM 提供降低的存储永久性，因为 EPROM 容易受到辐射和电噪声的影响。在EPROM的构造中，使用了MOS晶体管。

PROM 和 EPROM 的主要区别在于，PROM 只能编程一次，意味着它只能写入 1 次，而 EPROM 是可擦除的；因此它可以被重新编程。

我们来看看 PROM 和 EPROM 的区别：

S.NO	PROM	EPROM
1.	PROM is not reusable.	While EPROM is reusable multiple times.
2.	PROM is inexpensive.	While it is costlier than PROM.
3.	The processes of PROMS is irreversible, means it’s memory is permanent.	Whereas EPROM’s processes can be reversed.
4.	The storage endurance of PROM is high.	While EPROM’s storage endurance of PROM is less than PROM.
5.	PROM is totally sheathed during a plastic cowl.	While EPROM is boxed in during a rock crystal window so the ultraviolet radiation rays will transfer through it.
6.	PROM is the type of ROM is written only.	While EPROM is also the type of ROM is read and written optically.
7.	If there’s miscalculation or error or bug while writing on PROM, it becomes unusable.	Whereas if there’s miscalculation or error or bug while writing on EPROM, it will still be used once more.
8.	PROM is the older version of EPROM.	While EPROM is modern version of PROM.
9.	PROM is better than EPROM in terms of flexibility and scale.	While EPROM have less flexibility and scalability.
10.	In PROM, bipolar transistor is used.	While in EPROM, MOS transistor is used.