ICS844071I

www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844071I FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENERATOR FEATURES (1) Differential LVDS output Crystal oscillator interface, 18pF parallel resonant crystal (20.833MHz - 28.3MHz) Output frequency range: 62.5MHz - 170MHz VCO range: 500MHz - 680MHz RMS phase jitter @ 150MHz, using a 25MHz crystal (12kHz - 20MHz): 0.75ps (typical) 3.3V or 2.5V operating supply -40°C to 85°C ambient operating temperature Replaces ICS844051-11 GENERAL DESCRIPTION The ICS844071I is a Serial ATA (SATA)/Serial Attached SCSI (SAS) Clock Generator and a HiPerClockS™ member of the HiPerClocks TM family of high performance devices from ICS. The ICS844071I uses an 18pF parallel resonant crystal over the range of 20.833MHz - 28.3MHz. For SATA/SAS applications, a 25MHz crystal is used and either 75MHz or 150MHz may be selected with the FREQ_SEL pin. The ICS844071I has excellent <1ps phase jitter performance, over the 12kHz 20MHz integration range. The ICS844071I is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. ICS COMMON CONFIGURATION TABLE Inputs Crystal Frequency (MHz) 25 25 26.041666 26.041666 26.5625 26.5625 FREQ_SEL 0 1 0 1 0 1 M 24 24 24 24 24 24 N 4 8 4 8 4 8 Multiplication Value M/N 6 3 6 3 6 3 Output Frequency (MHz) 150 75 156.25 78.125 159.375 79.675 BLOCK DIAGRAM FREQ_SEL Pullup PIN ASSIGNMENT FREQ_SEL N 0 ÷4 1 ÷8 VDDA GND XTAL_OUT XTAL_IN 1 2 3 4 8 7 6 5 VDD Q ...