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ICS844N255I Datasheet(PDF) 1 Page - Integrated Device Technology |
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ICS844N255I Datasheet(HTML) 1 Page - Integrated Device Technology |
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1 / 21 page  DATA SHEET ICS844N255AKILF REVISION A NOVEMBER 23, 2011 1 ©2011 Integrated Device Technology, Inc. FemtoClock® NG Crystal-to-LVDS Clock Synthesizer ICS844N255I General Description The ICS844N255I is a 6-output clock synthesizer designed for wireless infrastructure clock applications. The device uses IDT’s fourth generation FemtoClock® NG technology for an optimum of high clock frequency and low phase noise performance, combined with a low power consumption and high power supply noise rejection. The reference frequency is selectable and the following frequency is supported: 25MHz. The synthesizer generates selectable 156.25MHz, 125MHz, 100MHz, 50MHz and 25MHz clock signals. The device is optimized for very low phase noise and cycle to cycle jitter. The synthesized clock frequency and the phase-noise performance are optimized for driving SRIO 1.3 and 2.0 SerDes reference, DSP and host-processor clocks. The device supports a 2.5V voltage supply and is packaged in a small, lead-free (RoHS 6) 48-lead VFQFN package. The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements. Features • 4TH generation FemtoClock® NG technology • Selectable 156.25MHz, 125MHz, 100MHz, 50MHz and 25MHz output clock signals synthesized from a 25MHz reference frequency • Six differential LVDS clock outputs • Crystal interface designed for a 25MHz crystal • RMS phase jitter @ 156.25MHz, using a 25MHz crystal (1MHz - 20MHz): 0.27ps (typical) • Internal regulator for optimum noise rejection • LVCMOS interface levels for the frequency select and output enable inputs • Full 2.5V supply voltage • Lead-free (RoHS 6) 48-lead VFQFN package • -40°C to 85°C ambient operating temperature Block Diagram QA nQA QB0 nQB0 QB1 nQB1 QC nQC QD nQD QE nQE Pulldown Pulldown Pulldown Pullup Pulldown Pullup Pulldown Pulldown Pulldown Pulldown Pulldown OSC XTAL_IN XTAL_OUT REF_CLK REF_SEL MSEL FSELB FSELC FSELD FSELE nOEA nOEB nOEC nOED nOEE ÷M ÷16 ÷20, ÷25 ÷20, ÷25 ÷50, ÷100 ÷50 ÷100 PFD & LPF FemtoClock® NG VCO 2500MHz Pulldown 0 1 5 25MHz 25MHz |
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