元器件交易网
PRELIMINARY
IntegratedCircuit
Systems, Inc.
CRYSTAL-TO-LVCMOS / LVTTL
FREQUENCY SYNTHESIZER WITH FANOUT BUFFER
FEATURES
6 LVCMOS/LVTTL outputs Crystal oscillator interface
Output frequency range: 53.125MHz to 125MHz Crystal input frequency: 25MHz and 25.5MHz RMS phase jitter at 106.25, using a 25.5MHz crystal(637KHz to 10MHz): 3.25ps Phase noise:100Hz.................-100 dBc/Hz1KHz.................-115 dBc/Hz10KHz.................-125 dBc/Hz100KHz.................-127 dBc/Hz
3.3V core, outputs may either be 3.3V, 2.5V or 1.8V 0°C to 70°C ambient operating temperature
Industrial temperature information available upon request
ICS84025
GENERAL DESCRIPTION
The ICS84025 is a Crystal-to-LVCMOS/LVTTLFrequency Synthesizer with Fanout Buffer and
a member of the HiPerClockS family of HighPerformance Clock Solutions from ICS. TheVCO frequency is programmed in steps equal
to the value of the crystal frequency. The VCO andoutput frequency can be programmed using the feedback andoutput frequency select pins. The low phase noise character-istics of the ICS84025 make it an ideal clock source for FibreChannel 1 and Gigabit Ethernet applications.
FUNCTION TABLE
Inputs
MR10000
F_SEL1X0011
F_SEL0X0101
25.5MHz25.5MHz25MHz25MHzXTAL
OutputFrequency
F_OUTLOW53.125MHz106.25MHz62.5MHz125MHz
BLOCK DIAGRAMPIN ASSIGNMENT
VDDOQ0GNDQ1VDDOQ2GNDQ3VDDOQ4GNDQ5
123456789101112
242322212019181716151413
F_SEL0F_SEL1MRXTAL1XTAL2GNDVDDAVDD
PLL_SELGNDncVDDO
24-Lead, 300-MIL SOIC
7.5mm x 15.33mm x 2.3mm body package
M PackageTop View
F_SEL1
PLL_SEL
MR
F_SEL0
ICS84025
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initialproduct characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
84025EM
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REV. A APRIL 16, 2003