ICS650-01

SYSTEM PERIPHERAL CLOCK SOURCE DATASHEET ICS650-01 Description The ICS650-01 is a low-cost, low-jitter, high-performance clock synthesizer for system peripheral applications. Using analog/digital Phase-Locked Loop (PLL) techniques, the device accepts a parallel resonant 14.31818 MHz crystal input to produce up to eight output clocks. The device provides clocks for PCI, SCSI, Fast Ethernet, Ethernet, USB, and AC97. The user can select one of three USB frequencies and also one of two AC97 audio frequencies. The OE pin puts all outputs into a high impedance state for board level testing. All frequencies are generated with less than one ppm error, meeting the demands of SCSI and Ethernet clocking. Block Diagram Features Packaged in 20-pin SSOP (QSOP) Pb (lead) free package Operating voltage of 3.3 V or 5 V Less than one ppm synthesis error in all clocks Inexpensive 14.31818 MHz crystal or clock input Provides Ethernet and Fast Ethernet clocks Provides SCSI clocks Provides PCI clocks Selectable AC97 audio clock Selectable USB clock OE pin tri-states the outputs for testing Selectable frequencies on three clocks Duty cycle of 40/60 Advanced, low-power CMOS process Industrial temperature range available VDD 3 PSEL1:0 ASEL USEL 2 14.31818 MHz Crystal or Clock X1/ICLK X2 Crystal Oscillator Clock Synthesis Circuitry 4 Processor Clocks Audio Clock USB Clock 20 MHz 14.31818 MHz 2 GND OE (all outputs) IDT™ / ICS™ SYSTEM PERIPHERAL CLOCK SOURCE ...