ICS841S02I

www.DataSheet4U.com PRELIMINARY PCI EXPRESS™ CLOCK GENERATOR ICS841S02I GENERAL DESCRIPTION The ICS841S02I is a PLL-based clock generator IC S specifically designed for PCI_Express™Clock HiPerClockS™ Generation applications. This device generates a 100MHz HCSL clock. The device offers a HCSL (Host Clock Signal Level) clock output from a clock input reference of 25MHz. The input reference may be derived from an external source or by the addition of a 25MHz crystal to the on-chip crystal oscillator. An external reference may be applied to the XTAL_IN pin with the XTAL_OUT pin left floating. The device offers spread spectrum clock output for reduced EMI applications. An I2C bus interface is used to enable or disable spread spectrum operation as well as select either a down spread value of -0.35% or -0.5%. The ICS841S02I is available in both standard and lead-free 20-Lead TSSOP packages. FEATURES Two 0.7V current mode differential HCSL output pairs Crystal oscillator interface, 25MHz Output frequency: 100MHz RMS period jitter: 3ps (maximum) Output skew: 35ps (maximum) Cycle-to-cyle jitter: 35ps (maximum) I2C support with readback capabilities up to 400kHz Spread Spectrum for electromagnetic interference (EMI) reduction 3.3V operating supply mode -40°C to 85°C ambient operating temperature Available in both standard (RoHS 5) and lead-free (RoHS 6) packages BLOCK DIAGRAM 25MHz PIN ASSIGNMENT PLL Divider Network SRCT[1:2] SRCC[1:2] VSS_SRC VDD_SRC SRCT2 ...