Fuse sensing circuits

摘要

A fuse sensing circuit is disclosed. Embodiments include: providing a sense input terminal; providing a sense output terminal; and providing first and second capacitors that are configured to charge and discharge based on the sense input terminal, wherein the first and second capacitors are further configured to discharge current to a fuse unit cell, and the sense output terminal is configured to indicate a fuse state of the fuse unit cell based on the discharging of the first and second capacitors. Embodiments include the indicated fuse state being based on a discharge rate difference between the discharging of the first capacitor and the discharging of the second capacitor.

主权项

1. A circuit comprising:
a sense input terminal; a sense output terminal; first and second capacitors that are configured to charge and discharge based on the sense input terminal, wherein the first and second capacitors are further configured to discharge current to a fuse unit cell, and the sense output terminal is configured to indicate a fuse state of the fuse unit cell based on the discharging of the first and second capacitors; a first pass-gate circuit having a first pass-gate input terminal and a first pass-gate output terminal; and a second pass-gate circuit having a second pass-gate input terminal and a second pass-gate output terminal, wherein the first pass-gate output terminal is coupled to a reference resistor of the fuse unit cell during a sensing period of the fuse unit cell, and the second pass-gate output terminal is coupled to a fuse of the fuse unit cell during the sensing period.