Programmable FemtoClock NG LVPECL/LVDS IDT8T49N004I Clock Generator with 4-Outputs DATASHEET General Description Features The IDT8T49N004I is a four output Clock Generator with selectable Fourth Generation FemtoClock NG PLL technology LVDSorLVPECLoutputs.TheIDT8T49N004Icangenerateanyone 2 Four selectable LVPECL or LVDS outputs via I C of four frequencies from a single crystal or reference clock.The four CLK, nCLK input pair can accept the following differential input frequencies are selected from the Frequency SelectionTable (Table 2 levels: LVPECL, LVDS, HCSL 3A) and are programmed via I C interface.The four predefined frequencies are selected in the user application by two frequency FemtoClock NGVCO Range: 1.91GHz - 2.5GHz selection pins. Note the desired programmed frequencies must be RMS phase jitter at 156.25MHz (12kHz - 20MHz): used with the corresponding crystal or clock frequency as indicated 228fs (typical) inTable 3A. RMS phase jitter at 156.25MHz (10kHz - 1MHz): 175fs (typical) Excellent phase noise performance is maintained with IDTs Fourth Generation FemtoClock NG PLL technology, which delivers Full 2.5V or 3.3V power supply sub-400fs RMS phase jitter. 2 I C programming interface PCI Express (2.5Gb/s), Gen 2 (5Gb/s), and Gen 3 (8Gb/s) jitter compliant -40C to 85C ambient operating temperature Lead-free (RoHS 6) packaging Pin Assignment 24 23 22 21 20 19 18 17 25 16 SCLK VCC SDATA 26 15 V EE VEE 27 14 FSEL0 28 VCCA 13 nCLK LOCK 29 12 CLK VEE 11 30 VEE VCC 31 XTAL OUT 10 CLK SEL 32 9 XTAL IN 12 3 4 5 6 7 8 IDT8T49N004I 32-LeadVFQFN 5mm x 5mm x 0.925mm package body 3.15mm x 3.15mm E-Pad NL Package IDT8T49N004ANLGI REVISION A OCTOBER 15, 2013 1 2013 Integrated Device Technology, Inc. V V EE EE Q0 Q2 nQ0 nQ2 V V CCO CCO Q1 Q3 nQ1 nQ3 V EE V EE nc FSEL1 IDT8T49N004I Data Sheet PROGRAMMABLE FEMTOCLOCK NG LVPECL/LVDS CLOCK GENERATOR WITH 4-OUTPUTS Block Diagram IDT8T49N004ANLGI REVISION A OCTOBER 15, 2013 2 2013 Integrated Device Technology, Inc.