843022AKI-02LFT

FemtoClock® Crystal-to-3.3V, 2.5V LVPECL Clock Generator 843022I-02 DATA SHEET GENERAL DESCRIPTION FEATURES The 843022I-02 is a Gigabit Ethernet Clock Generator. The 843022I-02 uses a 25MHz crystal to synthesize 125MHz or 62.5MHz. The 843022I-02 has excellent phase jitter performance, over the 12kHz – 20MHz integration range. The 843022I-02 is packaged in a small 16-pin VFQFN, making it ideal for use in systems with limited board space. • One differential 3.3V or 2.5V LVPECL output • Crystal oscillator interface designed for 25MHz, 18pF parallel resonant crystal • Output frequencies: 125MHz or 62.5MHz (selectable) • RMS phase jitter @ 125MHz, using a 25MHz crystal (12kHz - 20MHz): 0.57ps (typical) • Full 3.3V or 2.5V operating supply • -40°C to 85°C ambient operating temperature • Available in lead-free (RoHS 6) packaging • For functional replacement part use 8T49N241 FUNCTION TABLE Inputs FREQ_SEL Output Frequencies (with a 25MHz crystal) 0 125MHz 1 62.5MHz Phase Detector VCO XTAL_OUT ÷5 0 ÷10 1 Q nQ nc 11 nQ XTAL_IN 3 10 VCCO VEE 4 9 VCC 5 6 7 8 VEE OSC XTAL_OUT 2 nc 25MHz 16 15 14 13 12 FREQ_SEL XTAL_IN PWR_DN 1 VEE FREQ_SEL Pulldown nc VCC BLOCK DIAGRAM nc PIN ASSIGNMENT Q 843022I-02 16-Lead VFQFN 3mm x 3mm x 0.925 package body K Package Top View M = ÷25 (fixed) PWR_DN Pullup 843022I-02 REVISION A 11/4/15 1 ©2015 Integrated Device Technology, Inc. 843022I-02 DATA SHEET TABLE 1. PIN DESCRIPTIONS Number Name Type 1 PWR_DN Input 2, 3 XTAL_OUT, XTAL_IN Input 4, 5, 8 VEE Power 6, 13, 14, 15 nc Unused Description Pullup Output state control pin. See Table 3. LVCMOS/LVTTL interface levels. Crystal oscillator interface. XTAL_in is the input, XTAL_OUT is the output. Negative supply pins. No connect. 7 FREQ_SEL Input 9, 16 VCC Power Pulldown Frequency select pin. LVCMOS/LVTTL interface levels. Power supply pins. 10 VCCO Power Output supply pin. 11, 12 nQ, Q Output Differential clock outputs. LVPECL interface levels. NOTE: Pullup and Pulldown 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 CIN Input Capacitance 4 pF RPULLDOWN Input Pulldown Resistor 51 kΩ RPULLUP Input Pullup Resistor 51 kΩ TABLE 3. PWR_DN FUNCTION TABLE PWR_DWN Input Description 0 Output in high impedance 1 Output in normal operation FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR 2 REVISION A 11/4/15 843022I-02 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 Package Thermal Impedance, θJA 74.9°C/W (0 mps) Storage Temperature, TSTG -65°C to 150°C N OT E : S t r e s s e s b eyo n d t h o s e l i s t e d u n d e r A b s o l u t e 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. TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCO = 3.3V±5%, VEE = 0V, TA = -40°C TO 85°C Symbol Parameter Test Conditions Minimum Typical Maximum Units VCC Power Supply Voltage 3.135 3.3 3.465 V VCCO Output Supply Voltage 3.135 3.3 3.465 V IEE Power Supply Current PWR_DN = 1 86 mA PWR_DN = 0