FemtoClock NG Crystal-to-3.3V, 2.5V 8T49N012 LVPECL/LVCMOS Clock Generator with Fanout Buffer DATA SHEET Features General Description Fourth Generation FemtoClock NG PLL technology The 8T49N012 is a high performance Clock Generator with selectable LVPECL or Single-ended outputs.The 8T49N012 can Three differential output banks: generate selectable frequencies from a crystal or a single-ended Bank A:selectable between four pairs of LVPECL or four pairs reference clock.The frequency is selected from the Frequency of complementary LVCMOS/LVTTL outputs SelectionTable. Bank B:two pairs of LVPECL outputs Bank C:six pairs of LVPECL outputs Excellent phase noise performance is maintained with IDTs Fourth Generation FemtoClock NG PLL technology. Selectable clock input or crystal input. Supports 25MHz fundamental crystal or 25MHz, 50MHz, 66.67MHz clock input Selectable 156.25MHz, 125MHz, 100MHz clock for Bank B and Bank C outputs Selectable 156.25MHz, 125MHz, 100MHz, 250MHz, 312.5MHz, 50MHz, 25MHz, 62.5MHz or 78.125MHz for Bank A outputs PLL lock indication (LVCMOS output) RMS phase jitter at 156.25MHz (12kHz - 20MHz): 0.199ps (typical) Power supply modes: Core / Output 3.3V / 3.3V Pin Assignment 3.3V / 2.5V 2.5V / 2.5V -40C to 85C ambient operating temperature 56-LeadVFQFN Lead-free (RoHS 6) packaging 56 55 54 53 52 51 50 49 48 47 46 45 44 43 SE 1 42 QC0 V CC 2 41 nQC0 XTAL SEL 3 40 QC1 PS SEL 4 39 nQC1 V 5 38 V CCA CCO C V 6 37 QC2 EE NA DIV1 7 36 nQC2 8T49N012 NA DIV0 8 35 V EE V 9 34 CC X QC3 XTAL OUT 10 33 nQC3 XTAL IN 11 32 QC4 V 12 31 nQC4 EE CLK IN 13 30 QC5 nOE B 14 29 nQC5 18 19 20 21 24 27 28 15 16 17 22 23 25 26 56-LeadVFQFN, 8.0mm x 8.0mm x 0.9mm 8T49N012 REVISION 1 08/21/14 1 2014 Integrated Device Technology, Inc. nc V EE LOCK QA0 CMOS FB DIV nQA0 CMOS RESERVED V CCO A V CC QA1 CMOS NB DIV nQA1 CMOS V EE V EE nQB1 QA2 CMOS QB1 nQA2 CMOS nQB0 V CCO A QB0 QA3 CMOS V CCO B nQA3 CMOS NC DIV V EE V CCO C nOE C8T49N012 DATA SHEET Block Diagram LOCK XTAL SEL Pulldown QA0 CMOS nQA0 CMOS CLK IN Pulldown 0 QA1 CMOS XTAL IN PS PD nQA1 CMOS Xtal + VCO 1/NA 1 Osc QA2 CMOS CP XTAL OUT nQA2 CMOS QA3 CMOS PS SEL Pulldown 1/M nQA3 CMOS FB DIV Pulldown NA DIV 1,0 Pulldown SE Pulldown QB0 nQB0 1/NB QB1 nQB1 NB DIV Pulldown nOE B Pulldown QC0 nQC0 QC1 nQC1 QC2 nQC2 1/NC QC3 nQC3 NC DIV Pulldown QC4 nQC4 QC5 nQC5 nOE C Pulldown FEMTOCLOCK NG CRYSTAL-TO-3.3V, 2.5V LVPECL/LVCMOS 2 REVISION 1 08/21/14 CLOCK GENERATOR