Pending
Multiple-Output Clock Generators Exceed All Ethernet Data-Communication System Requirements
Maxim has introduced the MAX3627/MAX3629 low-jitter clock generators for high-speed networking applications. The MAX3627 has seven LVDS outputs and one LVCMOS output, while the MAX3629 has five LVDS outputs and three LVCMOS outputs. These devices utilize a low-noise crystal oscillator and PLL architecture to generate high-frequency (312.5MHz), ultra-low-jitter (0.14psRMS) clock signals from a 25MHz crystal or reference clock input. The MAX3627/MAX3629 simultaneously generate two pin-selectable frequencies for both Ethernet port clocking and MAC clocking. This function eliminates the need for an expensive high-frequency oscillator and a fanout buffer, thus saving board space and cost.
With excellent power-supply noise rejection (PSNR), both the MAX3627 and MAX3629 minimize jitter degradation in noisy power-supply environments, thus minimizing overall jitter degradation for increased quality of system timing design-this too saves board space and cost. The MAX3627/MAX3629 are ideal for Ethernet interface applications, such as enterprise switches and routers, and other high-speed data-communication systems that require a low-jitter Ethernet frequency.Both devices are fully specified over the 0 degrees Celsius to +70 degrees Celsius commercial temperature range, and operate from a 3.3V ±5% power supply. They are available in lead-free, 32-pin TQFN packages with prices starting at $8.80 (1000-up, FOB USA).
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