FemtoClock Crystal/LVCMOS-to- 843004I-04 3.3V LVPECL Frequency Synthesizer DATASHEET GENERAL DESCRIPTION FEATURES The 843004I-04 is a 4 output LVPECL Synthesizer optimized Four LVPECL outputs to generate clock frequencies for a variety of high performance Selectable crystal oscillator interface applications. This device can select its input reference clock or LVCMOS/LVTTL single-ended input from either a crystal input or a single-ended clock signal. It can be con gured to generate 4 outputs with individually selectable Supports the following applications: SONET/SDH, SATA, divide-by-one or divide-by-four function via the 4 frequency or 10Gb Ethernet rd select pins (F SEL 3:0 ). The 843004I-04 uses IDTs 3 Output frequency range: 140MHz - 170MHz, generation low phase noise VCO technology and can achieve 560MHz - 680MHz 1ps or lower typical rms phase jitter. This ensures that it will easily meet clocking requirements for SDH (STM-1/STM-4/STM- VCO range: 560MHz - 680MHz 16) and SONET (OC-3/OC12/OC-48). This device is suitable for Crystal oscillator and CLK range: 17.5MHz - 21.25MHz multi-rate and multiple port line card applications. The 843004I- 04 is conveniently packaged in a small 24-pin TSSOP package. RMS phase jitter 622.08MHz output, using a 19.44MHz crystal (12kHz - 20MHz): 0.82ps (typical) RMS phase jitter 156.25MHz output, using a 19.53125MHz crystal (1.875MHz - 20MHz): 0.57ps (typical) RMS phase jitter 155.52MHz output, using a 19.44MHz crystal (12kHz - 20MHz): 0.94ps (typical) Full 3.3V supply mode -40C to 85C ambient operating temperature Available in lead-free RoHS compliant package BLOCK DIAGRAM PIN ASSIGNMENT XTAL IN nQ1 nQ2 1 24 OSC 0 Q1 2 23 Q2 1 0 Q0 VCCo VCCO 3 22 XTAL OUT Q3 nQ0 Q0 4 21 Phase VCO 4 1 Pulldown nQ0 5 20 nQ3 CLK Detector 1 6 MR 19 VEE Pulldown 7 F SEL3 18 F SEL2 INPUT SEL nc 8 INPUT SEL 17 M = 32 9 VCCA 16 CLK Pulldown 10 15 F SEL0 VEE MR Q1 11 14 VCC XTAL IN 0 Pullup 12 13 F SEL0 nQ1 F SEL1 XTAL OUT 1 Pullup F SEL1 843004I-04 24-Lead TSSOP Q2 4.40mm x 7.8mm x 0.92mm 0 nQ2 package body 1 G Package Pullup F SEL2 Top View Q3 0 nQ3 1 Pullup F SEL3 843004I-04 REVISION A 5/27/15 1 2015 Integrated Device Technology, Inc.843004I-04 DATA SHEET TABLE 1. PIN DESCRIPTIONS Number Name Type Description 1, 2 nQ1, Q1 Output Differential output pair. LVPECL interface levels. 3, 22 V Power Output supply pins. CCO 4, 5 Q0, nQ0 Ouput Differential output pair. LVPECL interface levels. Active HIGH Master Reset. When logic HIGH, the internal dividers are reset causing the true outputs Qx to go low and the inverted outputs nQx 6 MR Input Pulldown to go high. When logic LOW, the internal dividers and the outputs are en- abled. LVCMOS/LVTTL interface levels. 7, F SEL3, 10, F SEL0, Input Pullup Frequency select pins. LVCMOS/LVTTL interface levels. See Table 3. 12, F SEL1, 18 F SEL2 8 nc Unused No connect. 9V Power Analog supply pin. CCA 11 V Power Core supply pin. CC XTAL OUT, Parallel resonant crystal interface. XTAL OUT is the output, 13, 14 Input XTAL IN XTAL IN is the input. 15, 19 V Power Negative supply pins. EE 16 CLK Input Pulldown LVCMOS/LVTTL clock input. Selects between crystal or CLK inputs as the the PLL Reference source. 17 INPUT SEL Input Pulldown Selects XTAL inputs when LOW. Selects CLK when HIGH. LVCMOS/LVTTL interface levels. 20, 21 nQ3, Q3 Output Differential output pair. LVPECL interface levels. 23, 24 Q2, nQ2 Output Differential output pair. LVPECL interface levels. NOTE: Pulldown and Pullup refer to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter Test Conditions Minimum Typical Maximum Units C Input Capacitance 4 pF IN R Input Pulldown Resistor 51 k PULLDOWN R Input Pullup Resistor 51 k PULLUP TABLE 3. OUTPUT CONFIGURATION AND FREQUENCY RANGE FUNCTION TABLE Inputs Output Frequency (MHz) VCO Divider Value Application (MHz) F SELx XTAL (MHz) Q0/nQ0:Q3/nQ3 0 19.44 622.08 1 622.08 SONET/SDH 1 19.44 622.08 4 155.52 0 18.75 600 1 600 SATA 1 18.75 600 4 150 0 19.53125 625 1 625 10 Gigabit Ethernet 1 19.53125 625 4 156.25 0 20.141601 644.5312 1 644.5312 10 Gigabit Ethernet 66B/64B FEC 1 20.141601 644.5312 4 161.13 FEMTOCLOCKS CRYSTAL/LVCMOS-TO- 2 REVISION A 5/27/15 3.3V LVPECL FREQUENCY SYNTHESIZER