General Description

The MAX3674 is a high-performance network clock synthesizer IC for networking, computing, and telecom applications. It integrates a crystal oscillator, a lownoise phase-locked loop (PLL), programmable dividers, and high-frequency LVPECL output buffers. The PLL generates a high-frequency clock based on a low-frequency reference clock provided by the on-chip crystal oscillator or an external LVCMOS clock. The MAX3674 has excellent period jitter, cycle-to-cycle jitter, and supply noise rejection performance. With output frequencies programmable from 21.25MHz to 1360MHz and support of two differential PECL output signals, the device provides a versatile solution for the most demanding clock applications.

Features

♦ 21.25MHz to 1360MHz Programmable PLL Synthesized Output Clocks

♦ Two Differential LVPECL-Compatible Outputs

♦ Cycle-to-Cycle Jitter 1.6ps RMS and Period Jitter 0.9ps RMS at 500MHz

♦ On-Chip Crystal Oscillator or Selectable LVCMOS-Compatible Reference Clock Input

♦ Excellent Power-Supply Noise Rejection

♦ Parallel or 2-Wire I2C Programming Interface

♦ Lock Indicator Output

♦ +3.3V Power Supply

♦ Power Consumption: 396mW at 3.3V

♦ 48-Pin LQFP Pb-Free Package

♦ -40°C to +85°C Temperature Range

Applications

    Ethernet Network ASIC Clock Generation

    Storage Area Network ASIC Clocking

    Optical Network ASIC Clocking

    Programmable Clock Source for Server, Computing, or Communication Systems

    Frequency Margining