The Intersil HCTS163MS is a Radiation Hardened synchronous presettable counter that feature look-ahead carry logic for use in high speed counting application. HCTS163MS is a binary counter, and is reset synchronously with the clock. Counting and parallel presetting are both accomplished synchronously with the negative to positive transition of the clock. The HCTS163MS utilizes advanced CMOS/SOS technology to achieve high-speed operation. This device is a member of radiation hardened, high-speed, CMOS/SOS Logic Family.