Description:The 849S625I is a high frequency clock generator. The 849S625I uses an external 25MHz crystal to synthesize 625MHz, 312.5MHz, 156.25MHz and 125MHz clocks. The 849S625I has excellent cycle-to-cycle and RMS phase jitter performance. The 849S625I operates at full 3.3V supply mode and is available in a fully RoHS compliant 48-lead TQFP, E-Pad package.
FLATPACK, HEAT SINK/SLUG, THIN PROFILE, FINE PITCH
Peak Reflow Temperature (Cel):
260
Primary Clock/Crystal Frequency-Nom:
25 MHz
Seated Height-Max:
1.2 mm
Supply Voltage-Max:
3.465 V
Supply Voltage-Min:
3.135 V
Supply Voltage-Nom:
3.3 V
Surface Mount:
YES
Technology:
CMOS
Temperature Grade:
INDUSTRIAL
Terminal Finish:
MATTE TIN
Terminal Form:
GULL WING
Terminal Pitch:
0.5 mm
Terminal Position:
QUAD
Width:
7 mm
uPs/uCs/Peripheral ICs Type:
CLOCK GENERATOR, OTHER
849S625BYILF Frequently Asked Questions (FAQs)
Renesas provides a recommended PCB layout guide in their application note (APL-AN-114) for the 849S625BYILF. It suggests using a 4-layer PCB with a dedicated thermal layer, and following specific guidelines for component placement, thermal vias, and copper pours.
To ensure reliable operation in high-temperature environments, it's essential to follow Renesas' guidelines for thermal design, including using a heat sink, thermal interface material, and ensuring good airflow. Additionally, consider using a thermal monitoring IC to detect overheating and take corrective action.
The input capacitor should be a low-ESR, high-frequency capacitor (e.g., ceramic or film capacitor) with a minimum capacitance of 10uF and a voltage rating of at least 25V. The capacitor should be placed as close as possible to the VIN pin to minimize inductance and ensure stable operation.
To troubleshoot POR issues, check the power supply voltage, ensure that the input voltage is within the specified range, and verify that the POR pin is properly connected. Also, review the device's reset timing and ensure that it meets the specified requirements.
The WDT settings depend on the specific application requirements. As a general guideline, set the WDT timeout period to a value that allows the system to recover from faults or brownout conditions. A typical value is around 1-2 seconds. Ensure that the WDT is properly configured and enabled to prevent unwanted resets.
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System Verified
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Community Approved
Sponsored
849S625BYILF Overview
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