| 摘要 |
<p>The fuse circuit comprises a fuse (F) and a transistor (Tr4) connected in series with an impedance element (Tr1, R) between a negative and a positive voltage supply sources (VSS, VDD). A potential (Vp) is generated at the junction point between the transistor (Tr4) and the impedance element (Tr1, R) and is applied to an inverter for indicating the fuse state. The impedance element including a transistor (Tr1) forms a constant-current source, and the internal resistance of transistor (Tr4) varies as a function of the fuse resistance. Due to the provision of the impedance element, a predetermined threshold resistor value can be provided which allows a correct detection of the fuse condition, even when the fuse is in "regrown fuse" or "grown-back" fuse state due to leakage between the fuse terminals after blowing of the fuse. </p> |
