Description:The 8535I-21 is a low skew, high performance 1-to-2 LVCMOS/LVTTL-to-3.3V LVPECL fanout buffer and a member of the HiPerClockS™ family of High Performance Clock Solutions from IDT. The 8535I-21 has two single-ended clock inputs. The single-ended clock input accepts LVCMOS or LVTTL input levels and translate them to 3.3V LVPECL levels. The clock enable is internally synchronized to eliminate runt clock pulses on the output during asynchronous assertion/deassertion of the clock enable pin. Guaranteed output an
Renesas provides a recommended PCB layout guide in their application note (APL-AN-1201) for the 8535AGI-21LF, which includes thermal vias, copper pours, and component placement guidelines to minimize thermal resistance and ensure reliable operation.
The 8535AGI-21LF has an internal overcurrent protection (OCP) feature, but it's recommended to add external OCP circuitry to ensure reliable operation. A simple OCP circuit can be implemented using a sense resistor, an op-amp, and a comparator to detect overcurrent conditions and shut down the device.
The recommended input capacitor value is 10uF to 22uF, with an X7R or X5R dielectric type. This ensures stable operation and minimizes input voltage ripple. The capacitor should be placed as close as possible to the VIN pin to reduce noise and improve power integrity.
To ensure EMC compliance, follow Renesas' guidelines for PCB layout, component selection, and shielding. Use a metal shield or a shielded inductor to reduce radiated emissions, and ensure that the device is placed at least 1mm away from the PCB edge to minimize radiation.
The maximum ambient temperature for the 8535AGI-21LF is 85°C, but it's recommended to derate the device's power dissipation to ensure reliable operation above 70°C. Consult the datasheet for thermal derating curves and guidelines.
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8535AGI-21LF Overview
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