Description:The 840NT4-01I is clock generator designed to provide ethernet and USB clocks for Freescale B4/ T4-based systems. The 840NT4-01I utilizes Renesas' FemtoClock NG® PLL technology to synthesize eight low phase-jitter Ethernet reference clocks. The clock generator also provides a 24MHz USB reference clock and a 25MHz reference output.
Renesas provides a reference design guide for the 840NT4-01NLGI, which includes recommendations for PCB layout, thermal management, and heat sink design. It's essential to follow these guidelines to ensure optimal performance, thermal stability, and reliability.
The 840NT4-01NLGI has built-in overcurrent protection and fault detection features. However, to implement these features, you need to connect the OCP (Overcurrent Protection) pin to a suitable resistor and capacitor network, and monitor the FLT (Fault) pin for fault detection. Renesas provides application notes and design guides that explain the implementation details.
The input capacitor selection and placement are critical for the 840NT4-01NLGI's performance and stability. Renesas recommends using a low-ESR capacitor with a value between 4.7uF to 10uF, placed as close as possible to the VIN pin. The capacitor should be rated for the maximum input voltage and have a suitable temperature rating.
To ensure EMC and reduce EMI emissions, follow Renesas' guidelines for PCB layout, component selection, and shielding. Use a metal shield or a shielded inductor, and ensure that the layout is symmetrical and balanced. Additionally, use EMI filters and common-mode chokes as needed, and follow the recommended decoupling and bypassing schemes.
The 840NT4-01NLGI has a high power density, so thermal design is critical. Ensure good airflow, use a heat sink with a suitable thermal interface material, and follow Renesas' guidelines for thermal design and layout. The junction temperature (Tj) should be kept below 125°C for reliable operation.
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840NT4-01NLGI Overview
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