XRK49911CJ-5 datasheet(4/12 Pages) EXAR

Part #	XRK49911CJ-5

Description	3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

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Manufacturer	EXAR [Exar Corporation]

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XRK49911

xr

3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

REV. 1.0.1

4

SKEW SELECT CONTROL

The skew select control consists of four independent banks. Each bank has two low-skew, high-fanout drivers

(Qx0, Qx1), and two corresponding tri-level function select (SELx0, SELx1) inputs. The nine possible output

states for each bank are shown in Table 2 as determined by each bank’s select inputs. All timing

measurements are made with respect to the CLKIN input with the output connected to the FB_IN input

configured for 0 tU operation.

NOTES:

1.

For all tri-level (three-state) inputs, HIGH indicates a connection to VCC, LOW indicates a connection to GND, and

MID indicates an open connection. Internal termination circuitry holds an unconnected input to VCC/2.

2.

The level to be set on FSEL is determined by the “normal” operating frequency (fNOM) of the PLL. Nominal

frequency (fNOM) always appears at QA0 and the other outputs when they are operated in their undivided modes

(see Table 2). The frequency appearing at the CLKIN and FB_IN inputs will be fNOM when the output connected to

FB_IN is undivided. The frequency of the CLKIN and FB_IN inputs will be fNOM ÷ 2 or fNOM ÷ 4 when the part is

configured for a frequency multiplication.

3.

When the FSEL pin is selected HIGH, the CLKIN input must not transition upon power-up until VCC has reached

2.8V.

TABLE 1: FREQUENCY RANGE SELECT AND tU CALCULATION

[1]

fNOM (MHZ)

tU = 1 / (fNOM X N)

APPROXIMATE

FREQUENCY (MHZ) AT

WHICH

tU = 1.0ns

FSEL[2]

MIN

MAX

WHERE

N =

LOW

15

30

44

22.7

MID

25

50

26

38.5

HIGH[3]

40

110

16

62.5

TABLE 2: PROGRAMMABLE SKEW CONFIGURATIONS [1]

FUNCTION SELECT INPUTS

OUTPUT FUNCTIONS

SELX1

SELX0

QA[1:0], QB[1:0]

QC[1:0]

QD[1:0]

LOW

-4tU

÷ 2

LOW

MID

-3tU

-6tU

LOW

HIGH

-2tU

-4tU

MID

LOW

-1tU

-2tU

MID

0tU

MID

HIGH

+1tU

+2tU

HIGH

LOW

+2tU

+4tU

HIGH

MID

+3tU

+6tU

HIGH

+4tU

÷ 4

Inverted

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