Crystal-to-LVPECL/LVDS 849S625 Clock Synthesizer Data Sheet General Description Features The 849S625 is a high frequency clock generator. The 849S625 Ten selectable differential LVPECL or LVDS outputs uses an external 25MHz crystal to synthesize 625MHz, 312.5MHz, Output frequencies of 625MHz, 312.5MHz, 156.25MHz or 156.25MHz and 125MHz clocks. The 849S625 has excellent 125MHz using a 25MHz crystal. cycle-to-cycle and RMS phase jitter performance. Crystal interface designed for a 25MHz, parallel resonant crystal The 849S625 operates at full 3.3V supply mode and is available in a Cycle-to-cycle jitter: 25ps (maximum) fully RoHS compliant 48-lead TQFP, E-Pad package. RMS phase jitter at 156.25MHz (1MHz - 20MHz): 0.375ps (typical), LVDS outputs Output duty cycle: 53% (maximum) Full 3.3V supply mode -40C to 85C ambient operating temperature Available in lead-free (RoHS 6) packaging Frequency Table for Bank A, B and C Outputs Crystal Frequency (MHz) M Feedback Divider VCO Frequency (MHz) Nx Output Divider Output Frequency (MHz) 25 25 625 1 625 25 25 625 2 312.5 25 25 625 4 156.25 25 25 625 5 125 Pin Assignment 48 47 46 45 44 43 42 41 40 39 38 37 XTAL IN 1 36 QA1 XTAL OUT 2 35 nQA1 VEE 3 34 QA2 SELC0 4 nQA2 33 SELC1 5 32 VCCO ICS849S625I OEA VEE 6 31 VCC QA3 7 30 OEB 8 29 nQA3 OEC QA4 9 28 SELB0 10 nQA4 27 SELB1 11 26 QA5 VEE 12 nQA5 25 13 14 15 16 17 18 19 20 21 22 23 24 48 Lead TQFP, E-Pad 7mm x 7mm x 1.0mm package body Y Package Top View 2015 Integrated Device Technology, Inc 1 December 2, 2015 VCCO VCC nQC1 REF CLK QC1 VEE nQC0 BYPASS QC0 MR SEL OUT nc VCCO SELA0 nQB1 SELA1 VCCA QB1 nQB0 QA0 QB0 nQA0 VCCO VCCO849S625 Data Sheet Block Diagram Pulldown SEL OUT Pullup OEA 2 Pulldown SELA 1:0 Pulldown BYPASS Pulldown REF CLK 1 2 6 QA 0:5 NA = 1, 2, 6 VCO XTAL IN nQA 0:5 Phase 4, 5 575MHz - 630MHz OSC 0 25MHz Detector XTAL OUT M = 25 Pulldown MR Pullup OEB 2 2 Pulldown NB = QB 0:1 SELB 0:1 1, 2, 2 nQB 0:1 4, 5 2 NC = QC 0:1 1, 2, 2 nQC 0:1 4, 5 Pulldown 2 SELC 0:1 Pullup OEC 2015 Integrated Device Technology, Inc 2 December 2, 2015