DATASHEET TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER ICS290 Description Features The ICS290 field programmable spread spectrum clock Packaged as 20-pin TSSOP Pb-free, RoHS compliant synthesizer generates up to eight high-quality, Eight addressable registers high-frequency clock outputs including multiple reference Replaces multiple crystals and oscillators clocks from a low-frequency crystal input. It is designed to Output frequencies up to 200 MHz at 3.3 V replace crystals, crystal oscillators and stand alone spread Configurable Spread Spectrum Modulation spectrum devices in most electronic systems. Input crystal frequency of 5 to 27 MHz TM Using IDTs VersaClock software to configure PLLs and Clock input frequency of 3 to 166 MHz outputs, the ICS290 contains a One-Time Programmable Up to eight reference outputs (OTP) ROM for field programmability. Programming Up to two sets of four low-skew outputs features include input/output frequencies, spread spectrum amount, eight selectable configuration registers and up to Operating voltages of 3.3 V two sets of four low-skew outputs. Controllable output drive levels Using Phase-Locked Loop (PLL) techniques, the device Advanced, low-power CMOS process runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The ICS290 is also available in factory programmed custom versions for high-volume applications. Block Diagram 3 VDD PLL1 with CLK1 3 Spread S2:S0 OTP CLK2 Spectrum ROM with PLL CLK3 Divide Values Logic PLL2 CLK4 and Output CLK5 Enable CLK6 Control PLL3 CLK7 X1/ICLK Crystal CLK8 Crystal or Oscillator Clock Input X2 GND 3 External capacitors are required with a crystal input. PDTS IDT TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 1 ICS290 REV H 030212ICS290 TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER EPROM CLOCK SYNTHESIZER Pin Assignment GND 1 20 S2 2 19 S0 VDD 3 18 PDTS S1 4 17 GND VDD 5 16 CLK1 CLK8 6 15 CLK7 CLK2 7 14 CLK3 CLK6 8 13 CLK4 CLK5 9 12 GND VDD 10 11 X1/ICLK X2 20 pin (173 mil) TSSOP Pin Descriptions Pin Pin Pin Pin Description Number Name Type 1 GND Power Connect to ground. 2 S0 Input Select pin 0. Internal pull-up resistor. 3 S1 Input Select pin 1. Internal pull-up resistor. Connect to +3.3 V. 4VDD Power 5 CLK1 Output Output clock 1. Weak internal pull-down when tri-state. 6 CLK2 Output Output clock 2. Weak internal pull-down when tri-state. 7 CLK3 Output Output clock 3. Weak internal pull-down when tri-state. 8 CLK4 Output Output clock 4. Weak internal pull-down when tri-state. 9 GND Power Connect to ground. 10 X1/ICLK XI Crystal input. Connect this pin to a crystal or external input clock. 11 X2 XO Crystal Output. Connect this pin to a crystal. Float for clock input. Connect to +3.3 V. 12 VDD Power 13 CLK5 Output Output clock 5. Weak internal pull-down when tri-state. 14 CLK6 Output Output clock 6. Weak internal pull-down when tri-state. 15 CLK7 Output Output clock 7. Weak internal pull-down when tri-state. 16 CLK8 Output Output clock 8. Weak internal pull-down when tri-state. 17 GND Power Connect to ground. Power-down tri-state. Powers down entire chip and tri-states clock outputs 18 PDTS Input when low. Internal pull-up resistor. Connect to +3.3 V. 19 VDD Power 20 S2 Input Select pin 2. Internal pull-up resistor. IDT TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 2 ICS290 REV H 030212