Description:The 9DB403 is compatible with the Intel DB400v2 Differential Buffer Specification. This buffer provides 4 PCI Express® Gen2 clocks. The 9DB403 is driven by a differential output pair from a CK410B+, CK505 or CK509B main clock generator.
Renesas provides a recommended PCB layout guide in their application note (APL-AN-1201) for thermal management. It suggests using a 4-layer PCB with a thermal relief pattern, and placing the device near a thermal pad or heat sink.
Renesas recommends following their thermal design guidelines, using a heat sink or thermal pad, and ensuring good airflow around the device. Additionally, consider using a thermal interface material (TIM) to improve heat transfer.
Renesas recommends using a low-ESR ceramic capacitor (e.g., X5R or X7R) for CIN, with a value between 4.7uF to 10uF. For COUT, use a low-ESR ceramic or electrolytic capacitor with a value between 10uF to 22uF. Ensure the capacitors meet the specified voltage and ripple current ratings.
Renesas suggests following good PCB design practices, such as using a solid ground plane, minimizing trace lengths, and keeping sensitive signals away from the switching node. Additionally, consider using EMI filters or shielding to reduce radiation.
Renesas recommends using a low-ESR ceramic capacitor (e.g., X5R or X7R) for CBST, with a value between 100nF to 220nF. For DBST, use a fast-recovery diode (e.g., 1N4148) with a reverse voltage rating greater than the input voltage.
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9DB403DGLF Overview
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