Siemens Data Book 1979/80 [antikvár]

General Information I. Type nomenclature for integrated circuitsi) The code consists of three letters followed by a serial number First two letters A. Solitary circuits The first letter identifies the circuit as: S: a solitary digital circuit T: an analog circuit U: a mixed analog/digital circuit The second letter has no fixed significance, with the exception of the letter H designating a hybrid circuit. B. Family circuits are digital circuits related in their specifications and designed to be mutually connected. The first two letters identify the family. The third letter indicates the temperature range or in exceptional cases another characteristic. A - no temperature range specified B - 0 to + 70°C If a circuit has been designed for a wider temperature C —55 to +125°C range but does not yet qualify for a higher classification, D —25 to + 70°C the code letter for the narrower temperature range is E - -25 to + 85°C used. F - -40 to + 85°C The serial number may either be a 4-digit number (assigned by PRO ELECTRON) or the serial number {combining figures and perhaps numbers) of an existing company number. Company numbers consisting of less than four digits are extended to a four-digit number by adding zeros (0) in front. A version-letter may be added to indicate a variation of the basic type. This can be used for indicating small modifications of the basic type or of the package. The version-letters have no fixed significance with the exception of the letter Z: internal connection as specified by customer ("customized wiring"). The following letters are used for package variations: C - cylindrical package D - dual In-line ceramic F - flat pack P - dual in-line plastic Q- quadruple in-line U - chips not built into the package