Universal high level logic monolithic circuits

Universal high level logic is a set of monolithic silicon integrated circuits which have been designed, developed and evaluated for digital applications with a wide variety of requirements. The basic circuit for the universal high level logic was conceived specifically for attaining a set of monolithic circuits which have as combined advantages, high speed, low power, high fanout, capacitive drive capability and high noise rejection. It includes the use of multiple emitter transistors for gate inputs and an inverter stage with a Darlington connection for high fanout and cascade for capacitive driving capability. Built-in short circuit protection is provided in the output. Propagation delays of under 8ċ10 nanoseconds have been obtained with 10m.w. dissipation. Fanouts of 30 and capacitive drive capability of several hundred picofarads are obtained without the use of buffer amplifiers. The performance of high level logic nand gates and flip-flops will be discussed over a range of temperature and operating conditions.