RTC clock synchronization buffer driver delay chip

The NBC12439 and NBC12439A are general-purpose, PLL-based synthesized clock sources. The VCO operates from 400 MHz to 800 MHz. The VCO frequency is sent to the N output divider, where it can be configured to provide a divide ratio of 1, 2, 4 or 8. The VCO and output frequency are programmable using the configuration logic's parallel or serial interface. The PLL loop filter is fully integrated without any external components. NBC12439 specifies the operating range as the commercial temperature range. The NBC12439A is specified to operate over the industrial temperature range.

The NB4N507A is a precision clock synthesizer that generates very low jitter differential PECL output clocks. It generates clock outputs based on integer multiples of the input reference frequency. The NB4N507A uses Phase Locked Loop (PLL) technology, accepts a standard fundamental mode crystal and will generate an output clock up to 200 MHz. In addition, the PLL circuit will generate a 50% duty cycle square clock output. The NB4N507A can be programmed to generate certain multiples of the input reference frequency. An accurate 155.52 MHz output clock can be generated based on a 19.44 MHz crystal with x8 multiplier option. The NB4N507A is suitable for low output jitter clock generation.