| 摘要 |
<p>PURPOSE:To accurately monitor an internal step-down power source level in a semiconductor integrated circuit using an internal step-down power source. CONSTITUTION:A semiconductor integrated circuit using an internal step-down power source has a circuit which compares an internal step-down power source level (VINT) with external signal input and a comparator, a test circuit buffer which propagates the compared result, and an output circuit which outputs data to an external output terminal, and these circuits are driven with an external power source (VCC), widen a power source margin, and ensure circuit operation independent of the VINT level. Accurate monitor of VINT before VINT adjusting can be expected. These circuits are also activated with a test mode signal.</p> |
