The LC89515K is a version of the LC8951 in which certain aspects of the internal registers have been improved to make them even easier to use in CD-ROM and CD-I products. The basic blocks are identical to those in the LC8951 and these products are software and pin compatible. Thus this product can replace the LC8951 without change. (However, this product is provided in a slightly different package: a short lead type QIP-80E as opposed to the QIP-80A.)