DATASHEET TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER ICS280 Description Features The ICS280 field programmable spread spectrum clock Packaged as 16-pin TSSOP Pb-free, RoHS compliant synthesizer generates up to four 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 Input clock frequency of 3 to 166 MHz outputs, the ICS280 contains a One-Time Programmable Up to four reference outputs (OTP) ROM for field programmability. Programming Operating voltages of 3.3 V features include input/output frequencies, spread spectrum amount and eight selectable configuration registers. Controllable output drive levels Advanced, low-power CMOS process Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The ICS280 is also available in factory programmed custom versions for high-volume applications. Block Diagram 3 VDD PLL1 with 3 Spread S2:S0 OTP Spectrum CLK1 ROM with PLL Values Divide PLL2 CLK2 Logic and Output Crystal or Enable CLK3 Clock Input Control PLL3 X1/ICLK CLK4 Crystal Oscillator X2 3 External capacitors GND are required with a crystal input. PDTS IDT TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 1 ICS280 REV G 030212ICS280 TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER EPROM CLOCK SYNTHESIZER Pin Assignment S2 GND 1 16 S0 2 15 VDD S1 PDTS 3 14 GND VDD 4 13 CLK1 CLK4 5 12 CLK2 6 11 CLK3 GND 7 10 VDD 8 9 X2 X1/ICLK 16 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 GND Power Connect to ground. 8 X1/ICLK XI Crystal input. Connect this pin to a crystal or external input clock. 9 X2 XO Crystal Output. Connect this pin to a crystal. Float for clock input. Connect to +3.3 V. 10 VDD Power 11 CLK3 Output Output clock 3. Weak internal pull-down when tri-state. 12 CLK4 Output Output clock 4. Weak internal pull-down when tri-state. 13 GND Power Connect to ground. Power-down tri-state. Powers down entire chip and tri-states clock outputs 14 PDTS Input when low. Internal pull-up resistor. Connect to +3.3 V. 15 VDD Power 16 S2 Input Select pin 2. Internal pull-up resistor. IDT TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 2 ICS280 REV G 030212