XRK49911CJ-7 datasheet(10/12 Pages) EXAR

Part #	XRK49911CJ-7

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

10

11.

tSKEWPR is defined as the skew between a pair of outputs (Qx0 and Qx1) when all eight outputs are selected for

0tU.

12.

tSKEW0 is defined as the skew between outputs when they are selected for 0tU. Other outputs are divided or

inverted but not shifted

13.

There are three classes of outputs: Nominal (multiple of tU delay), Inverted (QD[1:0] only with SELD0 = SELD1 =

HIGH), and Divided (QC[1:0] and QD[1:0] only in Divide-by-2 or Divide-by-4 mode).

14.

Guaranteed by statistical correlation. Tested initially and after any design or process changes that may affect

these parameters.

15.

tDEV is the output-to-output skew between any two devices operating under the same conditions (VCC ambient

temperature, air flow, etc.)

16.

tODCV is the deviation of the output from a 50% duty cycle. Output pulse width variations are included in tSKEW2

and tSKEW4 specifications.

17.

Specified with outputs loaded with 30pF for the XRK49911-5 and -7 devices. Devices are terminated through 50

Ω

to VCC/2. tPWH is measured at 2.0V. tPWL is measured at 0.8V.

18.

tORISE and tOFALL measured between 0.8V and 2.0V.

19.

tLOCK is the time that is required before synchronization is achieved. This specification is valid only after VCC is

stable and within normal operating limits. This parameter is measured from the application of a new signal or

frequency at CLKIN or FB_IN until tPD is within specified limits

FIGURE 6. AC TIMING DIAGRAMS

CLKIN

FB_IN

Qxx output

Other Qxx output

Inverted Qxx output

CLKIN Divided by 2

tREF

tRPWH

tRPWL

tPD

tODCV

tJR

tSKEWPR,

tSKEW0, 1

tSKEWPR,

tSKEW0, 1

tSKEW2

CLKIN Divided by 4

tSKEW3, 4

tSKEW1, 3, 4

tSKEW2, 4

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XRK49911CJ-7 Datasheet(PDF) 10 Page - Exar Corporation

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