The MK1574-01A/B are Phase-Locked Loop (PLL) based clock synthesizers that accept an 8kHz clock input as a reference and generate many popular communications frequencies. All outputs are frequency-locked together and to the input. This allows for the generation of locked clocks to the 8kHz backplane clock, simplifying clock generation and distribution in communications systems. * MK1574-01A — 5V operation * MK1574-01B — 3.3V operation Renesas manufactures the largest variety of clock generators and buffers and can customize this device for a variety of frequencies.