PDF ICS840021 Data sheet ( Hoja de datos )

Número de pieza	ICS840021
Descripción	CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER
Fabricantes	Integrated Circuit Systems
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No Preview Available ! Integrated Circuit Systems, Inc. ICS840021 FEMTOCLOCKS™CRYSTAL-TO- LVCMOS/LVTTL CLOCK GENERATOR GENERAL DESCRIPTION ICS The ICS840021 is a Gigabit Ethernet Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS840021 uses a 25MHz crystal to synthesize 125MHz.The ICS840021 has excellent phase jitter performance, over the 1.875MHz – 20MHz integration range. The ICS840021 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. www.DataSheet4U.com FEATURES • 1 LVCMOS/LVTTL output, 7Ω output impedence • Crystal oscillator interface designed for 25MHz, 18pF parallel resonant crystal • Output frequency: 125MHz • VCO range: 560MHz to 680MHz • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.34ps (typical) • RMS phase noise at 125MHz (typical) Phase noise: Offset Noise Power 100Hz ............... -96.9 dBc/Hz 1KHz .............. -122.2 dBc/Hz 10KHz .............. -131.1 dBc/Hz 100KHz .............. -129.5 dBc/Hz • 3.3V operating supply • 0°C to 70°C ambient operating temperature • Industrial temperature information available upon request BLOCK DIAGRAM OE 25MHz XTAL_IN OSC Phase VCO ÷5 Q0 XTAL_OUT Detector ÷25 (fixed) PIN ASSIGNMENT VDDA OE XTAL_OUT XTAL_IN 1 2 3 4 8 VDD 7 Q0 6 GND 5 nc ICS840021 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View 840021AG www.icst.com/products/hiperclocks.html 1 REV. A NOVEMBER 30, 2004 1 page Integrated Circuit Systems, Inc. ICS840021 FEMTOCLOCKS™CRYSTAL-TO- LVCMOS/LVTTL CLOCK GENERATOR PARAMETER MEASUREMENT INFORMATION 1.65V ± 5% VDD www.DataSheet4U.com LVCMOS GND -1.65V ± 5% SCOPE Qx Phase Noise Plot Phase Noise Mask f1 Offset Frequency f2 RMS Jitter = Area Under the Masked Phase Noise Plot 3.3V OUTPUT LOAD AC TEST CIRCUIT RMS PHASE JITTER V DD Q0 2 Pulse Width t PERIOD odc = t PW t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD 20% Clock Outputs 80% tR 80% tF 20% OUTPUT RISE/FALL TIME 840021AG www.icst.com/products/hiperclocks.html 5 REV. A NOVEMBER 30, 2004 5 Page Integrated Circuit Systems, Inc. ICS840021 FEMTOCLOCKS™CRYSTAL-TO- LVCMOS/LVTTL CLOCK GENERATOR Rev Table A T10 A T8 Page 10 3 8 REVISION HISTORY SHEET Description of Change Ordering Information Table - correct count from 154 to 100. Absolute Maximum Ratings - corrected Package Thermal Impedance air flow. Corrected air flow in table. Date 10/14/04 11/30/04 www.DataSheet4U.com 840021AG www.icst.com/products/hiperclocks.html 11 REV. A NOVEMBER 30, 2004 11 Page

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Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
ICS840021	CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER	Integrated Circuit Systems
ICS840021I	CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER	Integrated Circuit Systems
ICS840022	CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER	Integrated Circuit Systems
ICS840024I	CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER	Integrated Circuit Systems

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