ICS650G-40

ICS650-40 ETHERNET SWITCH CLOCK SOURCE Description The ICS650-40 is a clock chip designed for use in Ethernet Switch applications. Using ICS’ patented Phase-Locked Loop (PLL) techniques, the device takes a 25 MHz crystal input and produces various output clock frequencies as listed in Output Select Table. Features Packaged in 16-pin TSSOP Available in Pb (lead) free package Operating voltage of 3.3 V Low power consumption Input frequency of 25 MHz Low long-term jitter 2.5 V to 3.3 V clock outputs Block Diagram VDD 3 VDDOA S1:S0 2 Control Logic CLKA Phase Lock Loop CLKB X1/ICLK 25 MHz crystal or clock X2 Clock Buffer/ Crystal Oscillator 4 GND OE VDDOB Optional tuning crystal capacitors MDS 650-40 C I n t e gra te d C i r c u i t S y s t e m s ● 1 525 Race Stre et, San Jo se, CA 9 5126 ● Revision 060705 te l (40 8) 2 97-12 01 ● w w w. i c st . c o m ICS650-40 ETHERNET SWITCH CLOCK SOURCE Pin Assignment X1/ICLK VDD GND VDDOA CLKA CLKB VDDOB GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 X2 GND OE GND VDD VDD S1 S0 Output Select Table (MHz) S1 0 0 1 1 S0 0 1 0 1 CLKA (MHz) 127 133 157 189 CLKB (MHz) 127 133 157 189 16-pin (173 mil) TSSOP Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name X1/ICLK VDD GND VDDOA CLKA CLKB VDDOB GND S0 S1 VDD VDD GND OE GND X2 Pin Type Input Power Power Power Connect to +3.3 V. Connect to ground. Pin Description Crystal or clock input. Connect to a 25 MHz crystal or single ended clock. Connect t...