Abstract
In this paper, a BCD process based high-reliability 24-bit dual-port eFuse OTP Memory for PMICs is designed. We propose a comparison circuit at program-verify-read mode to test that the program datum is correct by using a dynamic pseudo NMOS logic circuit. The comparison result of the program datum with its read datum is outputted to PFb (pass fail bar) pin. Thus, the normal operation of the designed OTP memory can be verified easily by checking the PFb pin. Also we propose a sensing margin test circuit with a variable pull-up load out of consideration for resistance variations of programmed eFuse at program-verify-read mode. We design a 24-bit eFuse OTP memory which uses Magnachip`s BCD process, and the layout size is ($
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