ICS8402

Integrated Circuit Systems, Inc. ICS8402 350MHZ, CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER FEATURES 2 LVCMOS/LVTTL outputs Selectable crystal oscillator interface or LVCMOS/LVTTL TEST_CLK Output frequency range: 15.625MHz to 350MHz Crystal input frequency range: 12MHz to 40MHz VCO range: 250MHz to 700MHz Parallel or serial interface for programming counter and output dividers RMS period jitter: 8ps (typical) Cycle-to-cycle jitter: 40ps (typical) Full 3.3V or mixed 3.3V core/2.5V output supply voltage 0°C to 70°C ambient operating temperature Industrial temperature information available upon request GENERAL DESCRIPTION The ICS8402 is a general purpose, Crystal-toLVCMOS/LVTTL High Frequency Synthesizer and HiPerClockS™ a member of the HiPerClockS™ family of High Performance Clock Solutions from ICS. The ICS8402 has a selectable TEST_CLK or crystal inputs. The VCO operates at a frequency range of 250MHz to 700MHz. The VCO frequency is programmed in steps equal to the value of the input reference or crystal frequency. The VCO and output frequency can be programmed using the www.DataSheet4U.com serial or parallel interfaces to the configuration logic. The low phase noise characteristics of the ICS8402 make it an ideal clock source for Gigabit Ethernet and SONET applications. ICS BLOCK DIAGRAM OE0 OE1 VCO_SEL PIN ASSIGNMENT VCO_SEL nP_LOAD XTAL1 M4 32 31 30 29 28 27 26 25 XTAL_SEL TEST_CLK XTAL1 OSC XTAL2 1 0 M3 M2 M1 M0 M5 M6 M7 M8 N0 N1 1 ...