Programmable fuse trimming circuit system for IO port multiplexing

Abstract

The invention provides a programmable fuse trimming circuit system for IO port multiplexing. The system is composed of an SLEEP port input circuit, a programming pulse detection circuit, a reference and power-on reset circuit, a programming data decoding circuit, an array fuse reference reference circuit and N M-bit array fuse circuits. The programmable fuse trimming circuit system is irrelevant to the operation of the chip after completing one-time programming, so that the programming data transmission port is selected to be multiplexed with the SLEEP dormancy control port, pulse sequences with different amplitudes and pulse widths are transmitted to the SLEEP port input circuit, the pulse sequences are decoded into programming address signals, programming data signals and programming enable signals through the programming pulse detection circuit and the programming data decoding circuit, and the programmable fuse trimming circuit system has the advantages of being low in cost, programmable, high in reliability and capable of achieving IO port multiplexing.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a programmable fuse trimming circuit system for IO port multiplexing. Background technique [0002] With the development of integrated circuit CMOS, BICMOS, BCD technology and design technology and various product application requirements, the performance index of the circuit system is also getting higher and higher. However, in the process of integrated circuit manufacturing, the non-ideal factors of various processes will affect the performance indicators of the circuit system. These random errors are mainly manifested in the asymmetry of the current mirror, the absolute deviation of the resistance and capacitance, the temperature drift effect of the resistance and capacitance, the resistance Capacitance mismatch, transistor mismatch, input offset voltage, etc. The parasitic effects of the circuit system are generated in the production process of the chip level, wa...

AI Technical Summary

Problems solved by technology

[0003] Laser trimming has advantages in process compatibility, chip area and precision, but its cost is relatively high, it needs professional laser trimming equipment and harsh external environment to complete, and it is not easy to operate; diode trimming requires the support of many PAD ports, Occupies a large chip area; the cost of memory trimming mask is high, and the process compatibility is poor. If the amount of stored information is too small, it is not recommended for analog integrated circuits; fuse trimming includes metal fuse trimming, polysilicon fuse trimming Adjustment, electronic programmable fuse trimming, metal fuse trimming and polysilicon fuse trimming generally use high current blowing, similar to diode trimming, need many PAD port support, use probe PROBE to lead large The current is blown, once it is blown, it cannot be recovered, there is a problem of programming yield, and there are even cases where the fuse burns continuously

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