| 摘要 |
<p>PURPOSE:To properly operate a program circuit even when a fuse is remained with high resistance, by respectively connecting the source terminal of a first N-channel MOS transistor and the source terminal of a second N-channel MOS transistor to a GND power source and obtaining the output terminal of an inverter circuit as an output. CONSTITUTION:The drain terminal of a P-channel MOS transistor Q4, in which a gate element is connected to the GND power source, is connected to a fuse F and the source terminal of a P-channel MOS transistor Q3. When the fuse is disconnected, an N-channel MOS transistor Q2 is turned off finally and an N-channel MOS transistor Q1 and the P-channel MOS transistors Q3 and Q4 are turned on, a nodal point N1 is kept at an 'L' level, nodal points N2 and N4 are kept at an 'H' level and a nodal point N3 to be a program circuit output is kept to the 'L' level respectively. Accordingly, by the disconnection information of the fuse F, the electric potential of the nodal point N3 is determined and operated as a program circuit.</p> |
