Abstract: The present invention relates to a method for preparing enteric-coated oral drugs containing acid-unstable compound, in particular an enteric-coated oral drug prepared in the form of acid-stable dosage units as inclusion complex formed by reacting benzimidazole derivative, acid-unstable compound, with cyclodextrin in alkaline solution.

Abstract: The substrate current generated during the operation of a bit line equalizer can be reduced by adapting PMOS transistors which have a smaller ionization coefficient in its carrier of a hole than NMOS transistors for maintaining a pair of bit lines at the same potential before a sense amplifier is operated. Thus, the substrate voltage can be stabilized by reducing the substrate current in the operation of the bit line equalizer.

Abstract: A C-MOS address buffer for use in a semiconductor memory device is clocked by an inverted column address strobe signal .phi..sub.CAL of an external column address strobe signal CAS. The signal .phi..sub.CAL is supplied to the drain of a feedback transistor in a schmitt trigger and is reinverted to provide a signal corresponding to the address strobe signal CAS. This signal is coupled to the gate of a transistor which controls the application of a supply voltage to the schmitt trigger circuit. Invalid timing address signals between the address input signal Ai and the clock signal comprising the signal .phi..sub.CAL are thus prevented. Also sufficient address set up time and hold time are guaranteed.