The ML6430/ML6431 are multi-standard single-chip BiCMOS video Genlock ICs for NTSC, PAL and VGA. They are designed to provide a stable clock from an analog video signal, and to provide timing pulses for clamping, decoding, blanking and processing video signals. The ML6430/ML6431 handle VCR glitches and variations created by head switching, tape dropouts, missing sync pulses, freeze frames, high speed playback and camcorder gyro errors. The ML6430/ML6431 are designed for high noise immunity, insensitivity to varying signal amplitudes, overmodulated color carriers, and sync glitches. Advanced analog and digital clock synthesis techniques provide multi-standard and non-standard operation from a single crystal or external asynchronous clock source. Pin selectable preset modes allow operation for most video standards in simple stand-alone mode without the necessity of using the serial bus. For more demanding applications, a two wire serial control bus is available for full control of all of the ML6430/ML6431 features.