XRK4993CR-2 datasheet(9/13 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

9

REV. 1.0.0

3.3V PROGRAMMABLE SKEW CLOCK BUFFER

NOTES:

8.

Test measurement levels for the XRK4993 are TTL levels (1.5V to 1.5V). Test conditions assume signal transition

times of 2 ns or less and output loading as shown in the AC Test Loads and Waveforms unless otherwise

specified.

9.

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

these parameters.

10.

SKEW is defined as the time between the earliest and the latest output transition among all outputs for which the

same tU delay has been selected when all are loaded with 20pF and terminated with 75Ω to VCC/2 (XRK4993).

SWITCHING CHARACTERISTICS OVER THE 3.3V + 10% OPERATING RANGE [2,8]

SYMBOL

DESCRIPTION

XRK4993-2

XRK4993-5

XRK4993-7

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

tRPWH

CLKIN Pulse Width HIGH

4

ns

tRPWL

CLKIN Pulse Width LOW

4

ns

tu

Programmable Skew Unit

See Table 1

tSKEWPR Zero Output Matched-Pair Skew

(Qx[1:0]) [10, 11]

0.05

0.2

0.1

0.25

0.1

0.25

ns

tSKEW0

Zero Output Skew (All Outputs) [10, 12]

0.1

0.25

0.5

0.3

0.75

ns

tSKEW1

Output Skew (Rise-Rise, Fall-Fall,

Same Class Outputs)[10, 13]

0.25

0.5

0.6

0.7

0.6

1

ns

tSKEW2

Output Skew (Rise-Fall) [10, 13]

0.3

1

0.5

1

1.5

ns

tSKEW3

Output Skew (Rise-Rise, Fall-Fall,

Different Class Outputs) [10, 13]

0.25

0.5

0.7

1.2

ns

tSKEW4

Output Skew (Nominal-Divided) [10, 13]

0.5

0.9

0.5

1

1.2

1.7

ns

tDEV

Device-to-Device Skew [9, 14]

0.75

1.25

1.65

ns

tPD

Propagation Delay, CLKIN Rise to

FB_IN Rise

-0.25

0

0.25

-0.5

0

0.5

-0.7

0

0.7

ns

tODCV

Output Duty Cycle Variation [15]

-1

0

1

-1

0

1

-1.2

0

1.2

ns

tPWH

Output HIGH Time Deviation from 50%

[16]

2

2.5

3

ns

tPWL

Output LOW Time Deviation from 50%

[16]

1.5

3

3.5

ns

tORISE

Output Rise Time [16, 17]

0.15

1

1.2

0.15

1

1.5

0.15

1.5

2.5

ns

tOFALL

Output Fall Time [16, 17]

0.15

1

1.2

0.15

1

1.5

0.15

1.5

2.5

ns

tLOCK

PLL Lock Time [18]

0.5

ms

tJR

Cycle-to-Cycle Output

Jitter

RMS [9]

25

ps

Peak-to-Peak

[9]

200

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