ICS307

ICS307 Serially Programmable Clock Source Description The ICS307-01 and ICS307-02 are versatile serially programmable clock sources which take up very little board space. They can generate any frequency from 6 to 200 MHz, and have a second configurable output. The outputs can be reprogrammed on the fly, and will lock to a new frequency in 10 ms or less. Smooth transitions (in which the clock duty cycle remains roughly 50%) are guaranteed if the output divider is not changed. The devices include a PDTS pin which tri-states the output clocks and powers down the entire chip. The ICS307-02 features a default clock output at start-up and is recommended for all new designs. Features Packaged as 16 pin narrow SOIC Highly accurate frequency generation Serially programmable: user determines the output frequency via a 3 wire interface. Eliminates need for custom quartz Input crystal frequency of 5 - 27 MHz Output clock frequencies up to 200 MHz Power Down Tri-State mode Very low jitter Operating voltages of 3.0 to 5.5 V 25 mA drive capability at TTL levels Industrial temperature available Block Diagram TTL 2 Shift Register 3 2 R6:R0 7 VDD GND SCLK DATA STROBE C1:C0 S2:S0 F1:F0 9 V8:V0 Output Buffer VCO Divider S2:S0 3 VCO Output Divider PDTS CLK1 Crystal or clock input X1/ICLK Reference Divider Phase Comparator, Charge Pump, and Loop Filter Crystal Oscillator X2 Function Select 2 F1:F0 Output Buffer TTL CLK2 C1:C0 MDS 307 D 1 Revision 042501 Integr...