Description:The 843002I-01 is a 2 output LVPECL 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_SEL[1:0]): 156.25MHz, 125MHz, and 62.5MHz. The 843002I- 01 uses IDT's FemtoClock® low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meeting Ethernetjitter requirements. The 843002I-01 is packaged in a small 20-pin TSSOP package.
Renesas provides a recommended PCB layout guide in their application note (R01AN3804EU0100) 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 (R01AN3804EU0100) to ensure proper device operation and prevent latch-up. The sequence involves powering up the VCCIO and VCC cores in a specific order.
Renesas recommends using high-frequency, low-ESR capacitors (e.g., 0402 or 0603 packages) with a value of 0.1 μF to 1 μF, placed as close as possible to the power pins. The application note (R01AN3804EU0100) provides more detailed guidance.
Renesas provides a JTAG interface specification in their datasheet, but for production testing, it's recommended to use a JTAG controller or a boundary scan tool that supports the IEEE 1149.1 standard. Additionally, ensure that the JTAG pins are properly terminated and that the device is in a known state during testing.
Renesas provides thermal design guidelines in their application note (R01AN3804EU0100), including recommendations for thermal interface materials, heat sinks, and airflow. For high-temperature environments, it's essential to ensure proper heat dissipation and to consider the device's junction temperature (Tj) rating.
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843002AGI-01LF Overview
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