XRK4991IJ-5 datasheet(7/12 Pages) EXAR

Part #	XRK4991IJ-5

Description	3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

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Manufacturer	EXAR [Exar Corporation]

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XRK4991

REV. 1.0.1

3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

7

NOTES:

4.

These inputs are normally wired to VCC, GND or left unconnected (actual threshold voltages vary as a percentage

of VCC). Internal termination resistors hold unconnected inputs at VCC/2. If these inputs are switched, the function

and timing of the outputs may glitch and the PLL may require an additional tLOCK time before all data sheet limits

are achieved.

5.

XRK4991 should be tested one output at a time, output shorted for less than one second, less than 10% duty

cycle. Room temperature only.

6.

Total output current per output pair can be approximated by the following expression that includes device current

plus load current:

XRK4991: ICCN = {(4+0.11F) + [(835-3F)/Z + (.0022FC)]N} x 1.1

Where:

F = frequency in MHz

C = capacitive load in pF

Z = line impedance in ohms

N = number of loaded outputs; 0, 1, or 2

7.

Total power dissipation per output pair can be approximated by the following expression that includes device

power dissipation plus power dissipation due to the load circuit:

PD = {(22 + 0.61F) + [(1550 + 2.7F)/Z) + .0125FC]N} x 1.1

See note 6 for variable definition.

8.

Applies to CLKIN and FB_IN inputs only.

IOS

Short Circuit Current [5]

-200

mA

VCC = Max,

VOUT = GND (25° only)

ICCQ

Operating Current Used by Inter-

nal Circuitry

Com’l

95

mA

VCCN = VCCQ = Max.,

All Inputs Selects Open

Ind

100

ICCN

Output Buffer Current per Output Pair [6]

19

mA

VCCN = VCCQ = Max.,

IOUT = 0 mA

Inputs Selects Open, fMAX

PD

Power Dissipation per Output Pair [7]

104

mW

VCCN = VCCQ = Max.,

IOUT = 0 mA

Input Selects Open, fMAX

CAPACITANCE[8]

SYMBOL

DESCRIPTION

MAX.

UNIT

CONDITION

CIN

Input Capacitance

10

pF

TA = 25°C,

f=1MHz, VCC=3.3V

ELECTRICAL CHARACTERISTICS OVER THE 3.3V + 10% OPERATING RANGE

SYMBOL

DESCRIPTION

MIN

MAX

UNIT

CONDITION

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