843031AGILF

FemtoClock® Crystal-to-3.3V LVPECL Clock Generator ICS843031I DATA SHEET GENERAL DESCRIPTION FEATURES The ICS843031I is a 1 Gigabit Ethernet Clock Generator. The ICS843031I can synthesize 1 Gigabit Ethernet, SONET, or Serial ATA reference clock frequencies with the appropriate choice of crystal and output divider. The ICS843031I has excellent phase jitter performance and is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. • One differential 3.3V LVPECL output • Crystal oscillator interface designed for 18pF parallel resonant crystals • Output frequency range: 290MHz - 350MHz • VCO frequency range: 580MHz - 700MHz • RMS phase jitter @312.5MHz (1.875MHz - 20MHz): 0.475ps (typical) RMS phase jitter @318.75MHz (1.875MHz - 20MHz): 0.475ps (typical) • 3.3V operating supply • -40°C to 85°C ambient operating temperature • Available in both standard (RoHS 5) and lead-free (RoHS 6) packages FREQUENCY TABLE Inputs M/N Ratio (Multiplier) Output Frequency (MHz) 25.92 12 311.04 26.04166 12 312.5 26.5625 12 318.75 Crystal Frequency (MHz) BLOCK DIAGRAM XTAL_IN OSC XTAL-OUT PIN ASSIGNMENT Phase Detector VCO nQ0 ÷2 Q0 1 2 3 4 8 7 6 5 Q0 nQ0 VCC PWR_DN ICS843031I 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View ÷24 (fixed) PWR_DN ICS843031AGI REVISION A NOVEMBER 3, 2011 VCC XTAL_OUT XTAL_IN VEE 1 ©2011 Integrated Device Technology, Inc. FEMTOCLOCK® CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR ICS843031I Data Sheet TABLE 1. PIN DESCRIPTIONS Number Name 1, 6 Power 4 VCC XTAL_OUT, XTAL_IN VEE 5 PWR_DN Input 7, 8 nQ0, Q0 Output 2, 3 Type Description Input Power Pullup Power supply pin. Cr ystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output. Negative supply pin. Output state control input. High impedance when LOW (oscillator stops). LVCMOS/LVTTL interface levels. Differential clock outputs. LVPECL interface levels. NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characterristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter CIN Input Capacitance 4 pF RPULLUP Input Pullup Resistor 51 kΩ ICS843031AGI REVISION A NOVEMBER 3, 2011 Test Conditions 2 Minimum Typical Maximum Units ©2011 Integrated Device Technology, Inc. FEMTOCLOCK® CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR ICS843031I Data Sheet ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC 4.6V Inputs, VI -0.5V to VCC + 0.5V Outputs, IO Continuous Current Surge Current 50mA 100mA 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. Package Thermal Impedance, θJA 101.7°C/W (0 mps) Storage Temperature, TSTG -65°C to 150°C TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, VCC = 3.3V±5%, TA = -40°C TO 85°C Symbol Parameter VCC Power Supply Voltage IEE Test Conditions Power Supply Current Minimum Typical Maximum 3.135 3.3 Units 3.465 V PWR_DN = 1 105 mA PWR_DN = 0