Abstract: There is provided a nonvolatile memory device having a writing error preventing function with high noise resistance. This structure includes a switch and a noise filter circuit connected in parallel to a clock terminal, wherein a clock pulse monitoring circuit compares the number of clocks input from the clock terminal with a prescribed number, and when detecting abnormality in the number of clocks, switches to a noise countermeasure mode in which the switch is turned off to validate the noise filter circuit.

Abstract: There is provided a nonvolatile memory device having a writing error preventing function with high noise resistance. This structure includes a switch and a noise filter circuit connected in parallel to a clock terminal, wherein a clock pulse monitoring circuit compares the number of clocks input from the clock terminal with a prescribed number, and when detecting abnormality in the number of clocks, switches to a noise countermeasure mode in which the switch is turned off to validate the noise filter circuit.

Abstract: This invention provides a polycarbonate resin composition for optical use and an optical disc substrate manufactured therefrom. Polycarbonate resin is mixed with at least one kind of carboxylic acid selected from aliphatic carboxylic acids having 1 to 10 carbon atoms in which hydrogen atoms of aliphatic group may be substituted by hydroxyl groups; or aromatic carboxylic acids in which hydrogen atoms of the aromatic ring may be substituted by low alkyl groups, hydroxyl groups, or halogen atoms.The amount of the carboxylic acids is 5 to 1000 ppm based on the polycarbonate resin.

Abstract: This invention provides a polycarbonate resin composition for optical use and an optical disc substrate manufactured therefrom. Polycarbonate resin is mixed with at least one kind of carboxylic acid selected from aliphatic carboxylic acids having 1 to 10 carbon atoms in which hydrogen atoms of aliphatic group may be substituted by hydroxyl groups; or aromatic carboxylic acids in which hydrogen atoms of the aromatic ring may be substituted by low alkyl groups, hydroxyl groups, or halogen atoms.The amount of the carboxylic acids is 5 to 1000 ppm based on the polycarbonate resin.

Abstract: Disclosed herein is a polyester composition comprising a polyester and a modified copolymer of ethylene and an .alpha.-olefin prepared by grafting (1) an ester of an .alpha.,.beta.-unsaturated carboxylic acid represented by the formula(I): ##STR1## wherein n is an integer of from 0 to 4; m is an integer of from 1 to 10; R.sup.1 and R.sup.2 respectively represent a hydrogen atom or an alkyl group and R.sup.3 represents a hydrogen atom, an alkyl group or a carboxyl group, or (2) said ester of an .alpha.,.beta.-unsaturated carboxylic acid represented by the formula (I) and n .alpha.,.beta.-unsaturated carboxylic acid or an anhydride thereof with a copolymer of ethylene and an .alpha.-olefin.