DATASHEET SERIALLY PROGRAMMABLE CLOCK SOURCE ICS307-03 Description Features The ICS307-03 is a dynamic, serially programmable clock Crystal or clock reference input source which is flexible and takes up minimal board space. 3.3 V CMOS outputs Output frequencies are programmed via a 3-wire SPI port. Three outputs can be individually configured or shut off An advanced PLL coupled to an array of configurable Small 16-pin TSSOP package Pb-free, RoHS output dividers and three outputs allows low-jitter compliant generation of frequencies from 200 Hz to 270 MHz. Reprogrammable during operation The device can be reprogrammed during operation, making 3-wire SPI serial interface it ideal for applications where many different frequencies are required, or where the output frequency must be Glitch-free output frequency switching determined at run time. Glitch-free frequency transitions, User selectable charge pump current and damping where the clock period changes slightly over many cycles, resistor are possible. Power-down control via hardware pin or software control bit Programming word can be generated by IDT VersaClock II Software Directly programmable via VersaClock II Software and a Windows PC parallel port Industrial temperature range available Block Diagram Charge Pump Resistor (Table 3) (Table 4) (Table 1) REF Divide 300 Divider CP CLK1 11pF X1 1-2055 pF 2 - 8232 Bit 110 Bit 122 (Table 5) X2 VCO DIVIDE 12-2055 (Table 2) 1 Divider CLK2 2 - 34 0 Bit 111 DIN Bit 123 (Table 6) Programming CS Register (132 bits) SCLK 1 Divider CLK3 2 - 34 0 Bit 129 Bit 124 (Table 7) IDT SERIALLY PROGRAMMABLE CLOCK SOURCE 1 ICS307-03 REV L 032911ICS307-03 ICS307-03 SERIALLY PROGRAMMABLE CLOCK SOURCE SER PROG CLOCK SYNTHESIZER Pin Assignment X1 1 16 X2 VDD 2 15 PD VDD 3 14 CLK3 VDD 4 13 GND GND 5 12 CLK2 GND 6 11 DIN GND 7 10 CS CLK1 8 9 SCLK 16-pin TSSOP Pin Descriptions Pin Pin Pin Pin Description Number Name Type 1 X1 XI Connect to input reference clock or crystal. 2 VDD Power Power connection for crystal oscillator. 3 VDD Power Power connection for PLL. 4 VDD Power Power connection for inputs and outputs. 5 GND Power Ground connection for crystal oscillator. 6 GND Power Ground connection for PLL. 7 GND Power Ground connection for inputs and outputs. 8 CLK1 Output Clock 1 output. 9 SCLK Input Programming interface - Serial clock input. Internal pull-up. 10 CS Input Programming interface - LOAD input. Internal pull-down. 11 DIN Input Programming interface - Serial data input. Internal pull-up. 12 CLK2 Output Clock 2 output. 13 GND Power Ground connection. 14 CLK3 Output Clock 3 output. 15 PD Input Crystal, PLL, and outputs are powered-down when low. Internal pull-up. 16 X2 - Connect to crystal. Leave open if reference clock input is used. IDT SERIALLY PROGRAMMABLE CLOCK SOURCE 2 ICS307-03 REV L 032911