180M-51LF Renesas

DATASHEET LOW EMI CLOCK GENERATOR ICS180-51 Description Features The ICS180-51 generates a low EMI output clock from Pin and function compatible to Cypress W180-51 a clock or crystal input. The device uses IDTs Packaged in 8-pin SOIC proprietary mix of analog and digital Phase-Locked Provides a spread spectrum output clock Loop (PLL) technology to spread the frequency spectrum of the output, thereby reducing the frequency Accepts a clock input and provides same frequency amplitude peaks by several dB. dithered output Input frequency of 8 to 28 MHz The ICS180-51 offers center spread selection of +/-0.625% and +/-1.875%. Refer to the MK1714-01/02 Peak reduction by 7dB - 14dB typical on 3rd - 19th for the widest selection of input frequencies and odd harmonics multipliers. Spread percentage selection for +/-0.625% and IDT offers a complete line of EMI reducing clock +/-1.875% generators. Consult us when you need to remove Operating voltage of 3.3 V and 5 V crystals and oscillators from your board. Advanced, low-power CMOS process Block Diagram VDD FS2:1 PLL Clock SS% Synthesis and Spread CLK Spectrum X1/CLKIN Circuitry Clock Buffer/ Crystal Oscillator X2 GND IDT / ICS LOW EMI CLOCK GENERATOR 1 ICS180-51 REV C 051310ICS180-51 LOW EMI CLOCK GENERATOR SSCG Pin Assignment Spread Spectrum Select Table SS% Spread Spread X1/CLKIN 1 8 FS2 (Pin 4) Direction Percentage (%) X2 2 7 FS1 0 Center +/-0.625% GND 3 6 VDD 1 Center +/1.875% SS% 4 5 CLKOUT 0 = connect to GND 8 pin (150 mil) SOIC 1 = connect directly to VDD Note: SS% pin has an internal pull-up resistor Frequency Range Selection Table FS2 FS1 Frequency (Pin 8) (Pin 7) Range Selection (MHz) 00 8-10 0 1 10-15 1 0 15-18 1 1 18-28 Pin Descriptions Pin Pin Pin Type Pin Description Number Name 1 X1/CLKIN Input Crystal or Clock Input. 2 X2 Output Crystal output. Float for a clock input. 3 GND Power Connect to ground. 4 SS% Input Select pin for spread amount. See table above. Internal pull-up resistor. 5 CLKOUT Output Spread spectrum clock output per table above. 6 VDD Power Connect to 3.3 V or 5 V. 7 FS1 Input Select pin for input frequency. See table above. Internal pull-up resistor. 8 FS2 Input Select pin for input frequency. See table above. Internal pull-up resistor. IDT / ICS LOW EMI CLOCK GENERATOR 2 ICS180-51 REV C 051310