INTRODUCTION The Philips Semiconductors 74F50XXX series of products have been designed to resolve synchronization problems and at the same time produce complementary metastable/immune outputs with remarkably small skews useful in clock driving applications. The 74F5074 and 74F50109 are pin and function compatible replacements of the 74F74 and 74F109 respectively. The 74F50728 consists of two pair of cascaded D-type flip-flops, and the 74F50729 is a pin compatible replacement for the 74F74 with edge-triggered set and reset inputs.