This part of IEC 60748 gives requirements for the following categories or subcategories of interface integrated circuits. Category I: – subcategory A: line circuits (transmitters and receivers); – subcategory B: sense amplifiers; – subcategory C: peripheral drivers (including memory drivers) and level shifters; – subcategory D: voltage comparators. Category II: – linear and non-linear analogue-to-digital and digital-to-analogue converters. Category III: – control circuits for switch-mode power supplies. Category IV: – companding PCM coder-decoders (CODEC). Category V: – digital interface integrated circuits (UBF). Category VI: – integrated service digital network (ISDN). As stated in the foreword, this standard is to be used in conjunction with IEC 60747-1 and IEC 60748-1. In these standards, the user will find all basic information on: – terminology; – letter symbols; – essential ratings and characteristics; – measuring methods. The sequence of the different chapters is in accordance with IEC 60747-1, 2.1, chapter III.