Programmable read only memory applications




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Pin The eight 2K devices may be addressed on a single bus system. Pin 5: It is a serial data pin; it is bi-directional for serial data transfer.


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Pin 6: It is serial clock input, provides the positive clock signals. Pin 7: It is write protect pin, provides the hardware data protection.

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While the user wants to open the lock which is prompted by an LCD display duly connected to the microcontroller, he must enter the password by the keypad. If it is matched with the stored password in the EEPROM retrieved by the microcontroller it delivers logic high at pin38 and 37 to either to open or close the door. For the purpose of the output verification we can use two lamps to indicate door opening and closing. Hi Adil, We Suggest you to please follow this link of Model no Leave this field empty. Share This Post: LM IC: In this post we will try to understand What is ROM, How it works, its types, applications, advantages and disadvantages.

ROM is a type of Primary Memory. As the name suggests its contents can be read only but cannot write on it. It is a non-volatile memory and so the data is retained even when the power is switched off.

programmable read-only memory (PROM)

The data that is required to be stored inside ROM is written during manufacturing phase. It stores such programs that are essential for the booting process of the computer. It generally cannot be altered. However, technologies are available to program these types of ROM. A ROM operates like an array. It uses a diode to connect the lines if the value is 1. If the value is 0, then these lines are not connected at all. Each element of the array corresponds to one storage element in the memory chip.

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The address input to the chip is employed to pick out a specific memory location corresponding to the array index. The value read from the memory chip corresponds to the contents of the selected element of the array. In ROM, the input to decoder will be in binary form and output will be its decimal equivalent. ROM is differentiated on the basis of methods used to write data on ROM chips and the number of times they can be written.

It can be classified into following types: It is a memory chip that is manufactured with its contents. These are inexpensive and are the very first ROMs which were hard wired devices that contain a pre-programmed set of data or instructions.

Programmable ROMs

These chips contain a software mask that is burned onto the chip during design phase of the semiconductor manufacturing process. The specification of the ROM is taken by the manufacturer from its customer in tabular form and in a particular format. The manufacturer then makes the corresponding mask for the paths to produce the desired output.


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The cost of IC depends on its size, per bit. Mask ROM is more compact.

Electrically Erasable Programmable Read Only Memory

It is significantly cheaper than any other kind of secondary memory when large quantities of same ROM are manufactured. Design errors are costly i.

TYPES OF ROM AND THEIR DIFFERENCE EXPLAIN IN HINDI - PROM,EPROM,EEPROM

The life expectancy of MROM is also short, hence requires frequent replacement. PROM is manufactured as a blank memory.

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