Description:The 83940D is a low skew, 1-to-18 LVPECL-to- LVCMOS/LVTTL Fanout Buffer. The 83940D has two selectable clock inputs. The PCLK, nPCLK pair can accept LVPECL, CML, or SSTL input levels. The LVCMOS_CLK can accept LVCMOS or LVTTL input levels. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The 83940D is characterized at full 3.3V and 2.5V or mixed3.3V core, 2.5V output operating supply modes. Guaranteed output and part-to-part skew characterist
Renesas provides a recommended PCB layout guide in their application note (R01AN3601EU0100) 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 (R01AN3601EU0100) to ensure proper device operation. The sequence involves powering up the VCC, then the VDD, and finally the AVCC and DVCC.
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 of the device.
Renesas provides a JTAG interface specification in their datasheet, which includes information on signal levels, clock frequency, and boundary scan implementation. Engineers can use this information to develop a custom JTAG test fixture or use a third-party JTAG test tool.
The thermal resistance values for the 83940DYLFT package are not explicitly stated in the datasheet. However, Renesas provides a thermal model in their application note (R01AN3601EU0100) which includes thermal resistance values for the package, junction-to-case, and junction-to-ambient.
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83940DYLFT Overview
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