Description:The 843021 is a Gigabit Ethernet Clock Generator. The 84302 uses a 25MHz crystal to synthesize 125MHz. The 843021has excellent phase jitter performance, over the 1.875MHz – 20MHz integration range. The 843021is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.
Renesas provides a recommended PCB layout guide in their application note (AN) 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 a specific power sequencing scheme to ensure proper device operation. This information can be found in the device's user manual or application notes. Typically, the sequence involves powering up the core voltage (VCC) before the input/output voltage (VIO).
Renesas recommends using high-quality, low-ESR decoupling capacitors with a value of 0.1 μF to 1 μF, placed as close as possible to the device's power pins. The specific capacitor values and placement can be found in the device's datasheet or application notes.
Renesas provides guidelines for JTAG interface handling during production testing in their device-specific documentation. This may include using a JTAG adapter, configuring the JTAG pins, and using specific testing software.
Renesas provides thermal design guidelines and thermal models (e.g., JEDEC JESD51-7) to help designers estimate the device's junction temperature. Additionally, they recommend using thermal interface materials, heat sinks, and other thermal management techniques to ensure reliable operation in high-temperature environments.
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843021AGLF Overview
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