ICS650-40A

ETHERNET SWITCH CLOCK SOURCE DATASHEET ICS650-40A Description The ICS650-40A is a clock chip designed for use as a core clock in Ethernet Switch applications. Using IDT’s 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 Operating voltage of 3.3 V Low power consumption Input frequency of 25 MHz Low long-term jitter Separate supply voltage for clock outputs (2.5 / 3.3 V clock outputs) OE control capability Block Diagram VDD 2 VDDOA VDDOB S1:S0 2 Control Logic Phase Lock Loop X1/ICLK 25 MHz crystal or clock X2 Clock Buffer/ Crystal Oscillator Optional tuning crystal capacitors 4 GND OE CLKB CLKA CLKA IDT™ / ICS™ ETHERNET SWITCH CLOCK SOURCE 1 ICS650-40A REV E 051310 ICS650-40A ETHERNET SWITCH CLOCK SOURCE CLOCK SYNTHESIZER Pin Assignment X1/ICLK VDD GNDA VDDOA CLKA CLKA GNDA S1 1 2 3 4 5 6 7 8 16 X2 15 VDD 14 OE 13 GND 12 VDDOB 11 CLKB 10 GNDB 9 S0 16-pin (173 mil) TSSOP Output Select Table (MHz) S1 S0 CLKA CLKA CLKB (MHz) (MHz) (MHz) 0 0 127 127 157 0 1 133 133 189 1 0 157 157 127 1 1 189 189 133 Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name X1/ICLK VDD GNDA VDDOA CLKA CLKA GNDA S1 S0 GNDB CLKB VDDOB GND OE 15 VDD 16 X2 Pin Type Input Power Power Power Output Output Power Input Input Power Output Power Power Input Power Output Pin Description Crystal or clock in...