FemtoClock Crystal-to-3.3V, 2.5V 843071 LVPECL Clock Generator DATA SHEET General Description Features The 843071 is a Serial ATA (SATA)/Serial Attached SCSI (SAS) One differential 3.3V or 2.5V LVPECL output Clock Generator. The 843071 uses an 18pF parallel resonant crystal Crystal oscillator interface,18pF parallel resonant crystal over the range of 20.833MHz - 28.3MHz. For SATA/SAS (20.833MHz 28.3MHz) applications, a 25MHz crystal is used and either 75MHz or 150MHz Output frequency range: 62.5MHz 170MHz may be selected with the FREQ SEL pin. For 10Gb Fibre Channel VCO range: 500MHz 680MHz applications, a 26.5625MHz crystal is used for 159.375MHz output. RMS phase jitter at 150MHz, using a 25MHz crystal The 843071 has excellent <1ps phase jitter performance, over the (12kHz 20MHz): 0.64ps (typical) 3.3V output 12kHz - 20MHz integration range. The 843071 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited RMS phase jitter at 159.375MHz, using a 26.5625MHz crystal (1.875MHz 20MHz): 0.40ps (typical) 3.3V output board space. Full 3.3V or 2.5V operating supply -40C to 85C ambient operating temperature Available in lead-free (RoHS 6) package Common ConfigurationTable - Serial ATA/Serial Attached SCSI Inputs Crystal Frequency (MHz) FREQ SEL M N MultiplicationValue M/N Output Frequency (MHz) 25 0 24 4 6 150 25 1 24 8 3 75 26.5625 0 24 4 6 159.375 Block Diagram Pin Assignment VCCA 1 8 VCC Pullup FREQ SEL XTAL OUT 2 7 Q XTAL IN 3 6 nQ FREQ SEL VEE 4 5 FREQ SEL N XTAL IN Q0 Phase VCO 843071 0 4 OSC 500MHz - 680MHz nQ0 Detector XTAL OUT 1 8 8 LeadTSSOP 4.40mm x 3.0mm package body M = 24 (fixed) 843071 REVISION C 10/19/15 1 2015 Integrated Device Technology, Inc.843071 DATA SHEET Pin Description and Pin Characteristic Tables Table 1. Pin Descriptions Number Name Type Description Power Analog supply pin. 1V CCA 2, XTAL OUT Input Crystal oscillator interface. XTAL IN is the input, XTAL OUT is the output. 3 XTAL IN Power Negative supply pin. 4V EE 5 FREQ SEL Input Pullup Frequency select pin. LVCMOS/LVTTL interface levels. 6, 7 nQ, Q Output Differential output pair. LVPECL interface levels. Power Core supply pin. 8V CC NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. Table 2. Pin Characteristics Symbol Parameter Test Conditions Minimum Typical Maximum Units Input Capacitance 4pF C IN Input Pullup Resistor 51 k R PULLUP FEMTOCLOCK CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR 2 REVISION C 10/19/15