FemtoClock NG Clock Synthesizer 843N571I Datasheet Description Features The 843N571I is a PLL based clock synthesizer for use in Ethernet Fourth generation FemtoClock Next Generation (NG) technology applications. The device uses IDTs fourth generation FemtoClock Seven single-ended LVCMOS outputs, 30 output impedance NG technology for optimal high clock frequency and low phase noise Three LVPECL output pairs performance, combined with a low power consumption and high One differential LVPECL (QA, nQA) output pair: 156.25MHz power supply noise rejection. Using IDTs latest FemtoClock NG PLL Two selectable differential LVPECL output pairs (QB, nQB and technology, the 843N571I achieves <0.3ps RMS phase jitter QC, nQC): 100MHz and 125MHz performance. One single-ended LVCMOS (QD0) 33.33MHz CPU clock 843N571I can synthesize 100MHz, 125MHz, 156.25MHz and a low Selectable external crystal or single-ended input source frequency 33.33MHz CPU clock from a single device. Six LVCMOS Crystal oscillator interface designed for 25MHz, parallel resonant outputs also serve as additional buffering of the 25MHz crystal crystal reference. FemtoClock NG frequency multiplier provides low jitter, high frequency output FemtoClock NG VCO frequency: 2.5GHz RMS phase jitter 125MHz, using a 25MHz crystal (12kHz 20MHz): 0.283ps (typical) Power supply noise rejection PSNR: -80dB 3.3V supply voltage -40C to 85C ambient operating temperature Lead-free (RoHS 6) packaging Pin Assignment 40 39 38 37 36 35 34 33 32 31 QREF3 V 1 30 EE QREF2 V 2 29 CC QREF0 3 28 V CC ICS843N571I QREF1 4 27 FREQSEL 40-Lead VFQFN V 5 26 V CC CC 6mm x 6mm x 0.925mm XTAL IN 25 V 6 package body CC K Package XTAL OUT 24 V 7 CC Top View REFCLK 8 QD0 23 REFSEL 9 22 nQC 10 QC V 21 EE 11 12 13 14 15 16 17 18 19 20 2018 Integrated Device Technology, Inc 1 November 29, 2018 V V CC CC V nc CC nc nc nc FORCE LOW V nc CC V V CC CC V QA EE V CC nQA QREF5 QB QREF4 nQB843N571I Datasheet Block Diagram Pullup REFSEL QREF 0 XTAL IN QREF 1 25MHz OSC 1 QREF 2 XTAL OUT QREF 3 0 Pulldown REFCLK 25MHz QREF 4 QREF 5 PF FemtoClock NG QA + 16 nQA VCO CP 100 25 1 QB nQB 0 Pullup/Pulldown 3 -State FREQSEL Decoder 1 QC nQC 0 20 75 QD0 Pulldown FORCE LOW 2018 Integrated Device Technology, Inc 2 November 29, 2018