XRK4993CR-2 datasheet(11/13 Pages) EXAR

Part #	XRK4993CR-2

Description	3.3V PROGRAMMABLE SKEW CLOCK BUFFER

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Manufacturer	EXAR [Exar Corporation]

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XRK4993

11

REV. 1.0.0

3.3V PROGRAMMABLE SKEW CLOCK BUFFER

PE = LOW TIMING:

All output changes occur on the falling edge of the Clkin reference signal. Programmable skews are made

relative to this edge.

PE=HIGH TIMING:

When the PE pin is High, all changes begin relative to the rising edge of the Clkin reference signal. This

includes not only the "zero tu" signals but also the divided output signals. The divided-by-two outputs will

change on each rising edge. As QD can only be 0tu, QC is the only "divide by" output providing either divide-

by- two or divide-by-four, not both.

FIGURE 7. TIMING DIAGRAM PE=LOW

FIGURE 8. TIMING DIAGRAM PE=HIGH

Clkin

FB_In

Qxn

QC div2

QC div4

Clkin

FB_In

Qxn

QC div2

QC div4

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