FemtoClock Crystal-to-3.3V LVPECL 843051 Clock Generator DATA SHEET General Description Features The 843051 is a Gigabit Ethernet Clock Generator. The 843051 can One differential 3.3V LVPECL output synthesize 10 Gigabit Ethernet, SONET, or Serial ATA reference Crystal oscillator interface designed for 18pF parallel resonant clock frequencies with the appropriate choice of crystal and output crystals divider. The 843051 has excellent phase jitter performance and is RMS phase jitter at: packaged in a small 8-pin TSSOP, making it ideal for use in systems 155.52MHz (12kHz 20MHz): 0.74ps (typical) with limited board space. 156.25MHz (1.875MHz 20MHz): 0.43ps (typical) 161.13MHz (1.933Hz 20MHz): 0.43ps (typical) Offset Noise Power 100Hz -95 dBc/Hz 1kHz -110 dBc/Hz 10kHz -125 dBc/Hz 100kHz -125 dBc/Hz Full 3.3V output supply mode 0C to 70C ambient operating temperature Available in lead-free (RoHS 6) package Frequency Table Inputs Crystal Frequency (MHz) FREQ SEL Output Frequency Range (MHz) 20.141601 0 161.132812 20.141601 1 80.566406 19.53125 0 156.25 19.53125 1 78.125 19.44 0 155.52 19.44 1 77.76 18.75 0 150 18.75 1 75 Block Diagram Pin Assignment VCCA VCC 1 8 VEE Q0 2 7 XTAL IN 0 4 (default) Q0 Phase XTAL OUT nQ0 3 6 OSC VCO nQ0 1 8 Detector XTAL IN FREQ SEL 4 5 XTAL OUT 843051 32 8 Lead TSSOP (fixed) 4.40mm x 3.0mm package body 843051 REVISION B 10/15/15 1 2015 Integrated Device Technology, Inc.843051 DATA SHEET Table 1. Pin Descriptions Number Name Type Description 1V Power Analog supply pin CCA 2V Power Negative supply pin. EE 3, XTAL OUT Input Crystal oscillator interface. XTAL IN is the input, XTAL OUT is the output. 4 XTAL IN 5 FREQ SEL Input Pulldown Frequency select pin. LVCMOS/LVTTL interface levels. 6, 7 nQ0, Q0 Output Differential output pair. LVPECL interface levels. 8V Power Core supply pin. CC NOTE: Pulldown 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 C Input Capacitance 4 pF IN R Input Pulldown Resistor 51 k PULLDOWN Absolute Maximum Ratings NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. Item Rating Supply Voltage, V 4.6V CC Inputs, V -0.5V to V + 0.5V I CC Outputs, I O Continuous Current 50mA Surge Current 100mA 101.7C/W (0 mps) Package Thermal Impedance, JA -65C to 150C Storage Temperature, T STG DC Electrical Characteristics Table 3A. Power Supply DC Characteristics, V = 3.3V 5%, V = 0V, T = 0C to 70C CC EE A Symbol Parameter Test Conditions Minimum Typical Maximum Units V Core Supply Voltage 3.135 3.3 3.465 V CC V Analog Supply Voltage 3.135 3.3 3.465 V CCA I Power Supply Current 70 mA CC Analog Supply Current 15 mA I CCA I Power Supply Current 85 mA EE FEMTOCLOCK CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR 2 REVISION B 10/15/15