Apr 22, 1980
Sep 23, 1977
An integrated circuit pulse generator which may be externally digitally conditioned to provide an output signal at a frequency falling within a predetermined range of signal frequencies corresponding to a specified frequency tolerance includes a fixed frequency oscillator having an external frequency determining crystal which provides electrical pulses at a fixed frequency that is within a given range of frequencies above a nominal frequency. A pulse inhibit means coupled to the fixed frequency oscillator includes a plurality of programmable input terminals and cyclically inhibits selectable numbers of the electrical pulses responsive to selective actuation of the programmable input terminals to controllably transform the fixed frequency in delta amounts to an output signal frequency within the predetermined range of frequencies. A plurality of fusible links within the integrated circuit couple the programmable input terminals to an actuating potential by a common bus to normally actuate each input, and are also coupled to external pins by address leads to permit application of fusible link opening current to certain ones of the fusible links for removing their corresponding programmable input/terminals from the actuating potential. As a result, selected programmable input terminals may be left actuated to thereby cause the pulse inhibitor to cyclically inhibit a selected number of the electrical pulses to transform the fixed frequency to an output signal frequency within the predetermined range of frequencies. Also disclosed is a system for automatically conditioning the integrated circuit pulse generator for providing an output signal at a frequency within the predetermined range of frequencies corresponding to the specified tolerance.