ICS843252 データシートの表示（PDF） - Integrated Circuit Systems

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ICS843252

FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

PRELIMINARY

ICS843252

FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL

FREQUENCY SYNTHESIZER

TABLE 5. CRYSTAL CHARACTERISTICS

Parameter

Test Conditions

Mode of Oscillation

Frequency

FB_SEL = ÷25

FB_SEL = ÷32

Equivalent Series Resistance (ESR)

Shunt Capacitance

Drive Level

NOTE: Characterized using an 18pF parallel resonant crystal.

Minimum Typical Maximum

Fundamental

19.6

27.2

15.313

21.25

50

7

1

Units

MHz

MHz

Ω

pF

mW

TABLE 6. AC CHARACTERISTICS, VCC = VCCA = VCCO_A, VCCO_B = 3.3V±5%, TA = 0°C TO 70°C

Symbol Parameter

Test Conditions

Minimum Typical

Output Divider = ÷1

490

Output Divider = ÷2

245

fOUT

Output Frequency Range

Output Divider = ÷3

Output Divider = ÷4

163.33

122.5

Output Divider = ÷5

98

Output Divider = ÷8

61.25

tsk(o) Output Skew; NOTE 1, 3

Outputs @ Same Frequency

Outputs @ Different Frequencies

TBD

TBD

625MHz (1.875MHz - 20MHz)

0.36

tjit(Ø)

RMS Phase Jitter (Random);

NOTE 2

312.5MHz (1.875MHz - 20MHz)

156.25MHz (1.875MHz - 20MHz)

0.43

0.47

125MHz (1.875MHz - 20MHz)

0.47

tR / tF

Output Rise/Fall Time

20% to 80%

350

odc

Output Duty Cycle

50

NOTE 1: Defined as skew between outputs at the same supply voltages and with equal load conditions.

Measured at the output differential cross points.

NOTE 2: Please refer to the Phase Noise Plot.

NOTE 3: This parameter is defined in accordance with JEDEC Standard 65.

Maximum

680

340

226.67

170

136

85

Units

MHz

MHz

MHz

MHz

MHz

MHz

ps

ps

ps

ps

ps

ps

ps

%

843252AG

www.icst.com/products/hiperclocks.html

6

REV. A NOVEMBER 9, 2005

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