Description:The 83940-01 is a low skew, 1-to-18 LVPECL-to- LVCMOS/LVTTL Fanout Buffer. The 83940-01 has two selectable clock inputs. The PCLK, nPCLK pair can accept LVPECL, CML or SSTL input levels. The single ended clock input accepts LVCMOS or LVTTL input levels. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased from 18 to 36 by utilizing the ability of the outputs to drive two series terminated lines. The 83940-01
Renesas provides a recommended PCB layout guide in their application note (R01AN2732EU0100) which includes thermal design considerations, such as thermal vias, copper pours, and component placement.
Renesas recommends following their thermal design guidelines, using a heat sink if necessary, and ensuring proper airflow around the device. Additionally, the device's thermal protection feature can be enabled to prevent overheating.
Renesas recommends using a low-ESR capacitor (e.g., ceramic or film capacitor) for CIN and COUT, with values between 1-10uF and 1-22uF, respectively. The capacitor selection should be based on the specific application's requirements and noise tolerance.
Renesas recommends using a higher value for the input capacitor (CIN) and ensuring that the input voltage is within the recommended operating range. Additionally, the device's internal voltage regulator can be adjusted to optimize performance at low input voltages.
Renesas recommends following their EMI and EMC design guidelines, which include using a shielded layout, minimizing loop areas, and using EMI filters or common-mode chokes as necessary. Additionally, the device's switching frequency can be adjusted to minimize EMI emissions.
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83940DY-01LF Overview
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