What is OTP fuse?

What is OTP fuse?

The OTP fuse block is a 128-bit non-volatile memory that can only be programmed once, and data is stored permanently. The OTP feature is commonly used for customizing a device with unique codes. Some examples of OTP applications are the storing of manufacturing codes and unique user serial numbers.

What is OTP Ic?

OTP memory IP stands for One Time Programmable memory IP. It is a non-volatile memory and similar to PROM or Programmable Read Only Memory, One Time Programmable memory can only be programmed once. Once it has been programmed or blown, it cannot be modified.

Why do you need OTP and fuse box?

One-time programmable (OTP) memory is a type of non-volatile memory (NVM) that commonly comprises of electrical fuse (eFuse) and antifuse. The advantages of OTP memory over multi-time programmable (MTP) memory, such as EEPROM or flash memory, are smaller area and no additional wafer processing steps.

What is an OTP device in FPGA?

There are two broad categories of FPGA devices, reprogrammable and one-time programmable (OTP) devices. FPGA devices must be programmed at some point in the design process to define their functional operation.

What is antifuse state its merits and demerits?

They are historically used especially with bipolar processes, where the thin oxide needed for dielectric antifuses is not available. Their disadvantage, however, is lower area efficiency compared to other types. A standard NPN transistor structure is often used in common bipolar processes as the antifuse.

Can OTP be reprogrammed?

Once programmed, there is no way to reprogram (or erase the electrons from the floating gate) after the parts are (opaque) packaged (wafers can be UV erased and then reprogrammed). Thus, making it a true one time programmable (OTP) device.

Is OTP a ROM?

OTPs are typi- cally programmed by the customer. ROM (Read Only Memory): ROM devices are programmed at the fabrication step using a spe- cial mask containing the customer code. Therefore, the code can’t be modified after that step.

How does OTP memory work?

OTP (one time programmable) memory is a special type of non-volatile memory (NVM) that permits data to be written to memory only once. Once the memory has been programmed, it retains its value upon loss of power (i.e., is non-volatile).

Which is used as the fuse material in programmable ROMS?

The fuse uses material like nichrome and polycrystalline. The PROMs programmer selectively burns the fuses according to the bit pattern to be stored. This process is also known as burning of PROM.

What is the main advantage of antifuse FPGAs?

The advantages of antifuse FPGAs are that they are non-volatile and the delays due to routing are very small, so they tend to be faster.

What is the purpose of eFuse?

An eFuse is an “active circuit protection device with an integrated FET used to limit currents, voltages to safe levels during fault conditions”. It embeds various functions to protect system against inrush current, overcurrent, overvoltage, reverse current, reverse polarity and short circuit faults.

How does I-fuse OTP reduce program current?

I-fuse™ technologies achieve 100x reliability, 1/100 cell size, and 1/10 program current of the ubiquitous e-fuse, by (a) using junction diode, instead of MOS as a program selector in an OTP cell, (b) setting program current below a catastrophic breaking point, and (c) using small cell to increase program efficiency to reduce program current.

Which is the best OTP for electrical fuses?

Electrical fuse with a 1R1T (1 Resistor and 1 Transistor) cell is the most popular OTP technology. However, the cell size is huge because of large MOS device. Programming an e-fuse is more like an explosion such that debris may micro-bridge to create shorts after prolong use or burn-in. The defect rate is about 10ppm (10 parts per million) [1].

What can an OTP be used for on a chip?

OTP can be used in chip IDs, security keys, product features selection, memory redundancy, device trimming, parameter or configuration storage, and code memory for MCU, as shown in Fig. 1. Every chip needs OTPs if they can be reliable, available, and affordable in any CMOS processes.

Which is the most reliable OTP program mechanism?

I-fuse™ program mechanism is based on true electromigration (EM) that is the most reliable and most robust mechanism amongst all OTP technologies. I-fuse™ cell has only one fuse and one diode that is about half of an SRAM cell.