Description:The 840004I-01 is a 4 output LVCMOS/LVTTL Synthesizer optimized to generate Ethernet reference clock frequencies. Using a 25MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL1:0): 156.25MHz, 125MHz, and 62.5MHz. The 840004I-01 uses IDT's 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical random rms phase jitter, easily meeting Ethernet jitter requirements. The 840004I-01 is packaged in a small 20-pin TSS
Renesas provides a recommended PCB layout guide in their application note (APN) documents, which can be found on their website. The guide includes thermal vias, copper pours, and other layout considerations to ensure optimal thermal performance.
Renesas recommends following the power sequencing guidelines outlined in their datasheet and application notes. Typically, this involves powering up the VCCIO and VCC cores in a specific order, with a delay between each power-up sequence to ensure proper device operation.
Renesas recommends using high-quality, low-ESR decoupling capacitors with a value of 0.1uF to 1uF, placed as close as possible to the device's power pins. The exact capacitor value and type may vary depending on the specific application and operating frequency.
Renesas provides guidelines for clock signal integrity and jitter in their application notes. This includes using high-quality clock sources, proper PCB layout, and signal termination techniques to minimize jitter and ensure reliable device operation.
Renesas recommends following their thermal design guidelines, which include using thermal interfaces, heat sinks, and thermal vias to dissipate heat. Additionally, designers should consider the device's thermal derating, junction temperature, and thermal shutdown features to ensure reliable operation in high-temperature environments.
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840004BGI-01LF Overview
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