FemtoClock Crystal-to-3.3V, 2.5V LVPECL 843031I-01 Clock Generator DATA SHEET GENERAL DESCRIPTION FEATURES The 843031I-01 is an 10Gb Ethernet Clock Generator. The One differential 3.3V or 2.5V LVPECL output 843031I-01 uses an 18pF parallel resonant crystal. The 843031I-01 Crystal oscillator interface designed for 25MHz, has excellent <1ps phase jitter performance, over the 1.875MHz - 18pF parallel resonant crystal 20MHz integration range. The 843031I-01 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board Output frequencies: 280MHz 340MHz space. VCO range: 560MHz - 680MHz RMS phase jitter 312.5MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.46ps (typical) Full 3.3V or 2.5V operating supply -40C to 85C ambient operating temperature Available in lead-free (RoHS 6) package COMMON CONFIGURATION TABLE Inputs Output Frequency Multiplication (MHz) Crystal Frequency (MHz) M N Value M/N 25 25 2 12.5 312.5 BLOCK DIAGRAM PIN ASSIGNMENT Pullup OE 1 8 VCCA VCC 2 7 VEE Q 3 6 XTAL OUT nQ XTAL IN VCO Q 4 5 Phase XTAL IN OE N = 2 (fixed) OSC Detector nQ XTAL OUT 843031I-01 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm M = 25 (fixed) package body G Package Top View 843031I-01 REVISION A 10/15/15 1 2015 Integrated Device Technology, Inc.843031I-01 DATA SHEET TABLE 1. PIN DESCRIPTIONS Number Name Type Description 1V Power Analog supply pin. CCA 2V Power Negative supply pin. EE XTAL OUT, Crystal oscillator interface. XTAL IN is the input, 3, 4 Input XTAL IN XTAL OUT is the output. 5 OE Input Pullup Output Enable pin. LVCMOS/LVTTL interface levels. 6, 7 nQ, Q Output Differential clock outputs. LVPECL interface levels. 8V Power Power supply pin. 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 C Input Capacitance 4 pF IN R Input Pullup Resistor 51 k PULLDOWN TABLE 3. OE FUNCTION TABLE Input Outputs OE Q/nQ 0 Hi-Z 1 Enabled FEMTOCLOCK CRYSTAL-TO- 2 REVISION A 10/15/15 3.3V, 2.5V LVPECL CLOCK GENERATOR