| 主权项 |
1. A fuse blow detection circuit, comprising:
a fuse circuit comprising a fuse having a first end coupled to ground; a common node coupled to a second end of said fuse; a pre-charge circuit coupled to said common node for pre-charging said common node to a pre-charged HIGH level; an inverter having an inverter output and an inverter input, wherein said inverter input is coupled to said common node; a feedback latch coupled between a voltage source and ground and having a latch input coupled to said inverter output and a latch output coupled to said common node, wherein said feedback latch comprises a p-channel field effect transistor (FET) having a gate coupled to said inverter output, a source coupled to said voltage source, and a drain coupled to said common node, and an n-channel FET having a gate coupled to said inverter output, a source coupled to said common node, and a drain coupled to said ground; and a test circuit coupled to said common node, wherein in a normal mode said test circuit adds strength to said feedback latch for purposes of maintaining said common node at said pre-charged HIGH level, such that in a test mode said feedback latch is weaker than in said normal mode for purposes of maintaining said common node at said pre-charged HIGH level, wherein said test circuit comprises a contribution transistor having a gate coupled to said output and a drain coupled to said common node, and a switch transistor having a source coupled to said voltage source, a drain coupled to said source of said contribution transistor and a gate controlled by a test mode signal, wherein said p-channel FET has a width/length ratio that is greater than or equal to 1.8 times the wide the length ratio of the p-channel FET. |
