Description:The 9FGL0441/51 devices are 4-output 3.3V PCIe Gen1–5 clock generators. Each output has a dedicated OE# pin supporting PCIe CLKREQ# functionality. Two different spread spectrum levels, in addition to spread off, are supported. The 9FGL0441/51 supports PCIe Gen1–5 Common Clocked architectures (CC), PCIe Separate Reference no-Spread (SRNS) and Separate Reference Independent Spread (SRIS) clocking architectures.
Renesas provides a recommended PCB layout guide in their application note (R01AN4301EJ0100) which includes thermal design considerations, such as thermal vias, copper pours, and component placement.
Renesas recommends a specific power sequencing scheme in their application note (R01AN4301EJ0100) to ensure proper device operation. The sequence involves powering up the VCC, then the VDD, and finally the VTT.
Renesas recommends using high-frequency, low-ESR capacitors (e.g., 100nF, 1uF, and 10uF) with a voltage rating of 2.5V or higher, placed as close as possible to the device's power pins.
The thermal shutdown feature is enabled by default. When the device temperature exceeds 150°C, it will shut down. To handle this, implement a thermal monitoring system, and ensure proper cooling and thermal design to prevent overheating.
Renesas recommends using a clock signal with a rise time of 1ns or less, and a clock frequency of 100MHz or less. Additionally, ensure the clock signal is properly terminated and routed to minimize signal degradation.
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9FGL0451DKILFT Overview
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