Description:The 83947I is a low skew, 1-to-9 LVCMOS Fanout Buffer. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased from 9 to 18 byutilizing the ability of the outputs to drive two series terminated lines. Guaranteed output and part-to-part skew characteristics make the 83947I ideal for high performance, single ended applications that also require a limited output voltage.
Renesas provides a recommended PCB layout guide in their application note (APL-AN-114) 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 (APL-AN-115) to ensure proper device operation and prevent damage. The sequence involves powering up the VCC, then the VDD, and finally the AVCC.
Renesas recommends using 0.1uF to 1uF decoupling capacitors with a voltage rating of 10V or higher, placed as close as possible to the power pins. The exact value and type of capacitor may vary depending on the specific application and PCB layout.
Renesas provides a troubleshooting guide in their application note (APL-AN-116) which covers common issues, such as power-on reset, clock signal integrity, and digital signal integrity. The guide also provides tips for using oscilloscopes and logic analyzers for debugging.
The thermal resistance values for the 83947AYILNT package are not explicitly stated in the datasheet. However, Renesas provides a thermal model in their thermal design guide (TDG-2019-001) which includes thermal resistance values for the package. The values are: RθJA = 30°C/W, RθJC = 10°C/W, and RθJB = 20°C/W.
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83947AYILNT Overview
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