| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal level shifting circuit capable of preventing the generation of a through current even when power supply voltage capable of applying an input side signal level is dropped. SOLUTION: A power supply voltage detection circuit DT detects the drop of voltage of a power supply VDDL for applying the signal level of an input signal IN. A switch circuit consisting of an NMOS transistor (TR) TN3 is connected to a current route consisting of PMOS TRs TP1, TP2 (a load circuit part) and NMOS TRs TN1, TN2 (a driving circuit part) in a level shift stage LS1. When the voltage drop of the power supply VDDL is detected, the switch circuit is closed. Even when the voltage of the power supply VDDL is dropped and both the NMOS TRs TN1, TN2 are turned on, the generation of a through current can be effectively suppressed in the level shift stage LS1. COPYRIGHT: (C)2003,JPO
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