Rev 1.4, May 28, 2007

Page 15 of 18

SL23EP08

External Components & Design Considerations

Typical Application Schematic

Comments and Recommendations

Decoupling Capacitor: A decoupling capacitor of 0.1 F must be used between VDD and VSS pins. Place the

capacitor on the component side of the PCB as close to the VDD pin as possible. The PCB trace to the VDD pin and

to the GND via should be kept as short as possible. Do not use vias between the decoupling capacitor and the VDD

pin.

Series Termination Resistor: A series termination resistor is recommended if the distance between the output

clocks and the load is over 1 ½ inch. The nominal impedance of the clock outputs is given on the page 5. Place the

series termination resistors as close to the clock outputs as possible.

Zero Delay and Skew Control: All outputs and CLKIN pins should be loaded with the same load to achieve “Zero

Delay” between the CLKIN and the outputs. The CLKOUT pin is connected to CLKIN internally on-chip for feedback

to PLL. For applications requiring zero input/output delay, the load at the all output pins including the CLKOUT pin

must be the same. If any delay adjustment is required, the capacitance at the CLKOUT pin could be increased or

decreased to increase or decrease the delay between Bank A and B clocks and CLKIN. For minimum pin-to-pin

skew, the external load at all the Bank A and B clocks must be the same.