557G03LF

PCI-EXPRESS GEN1 CLOCK SOURCE DATASHEET ICS557-03 Description The ICS557-03 is a spread spectrum clock generator that supports PCI-Express Gen 1 and Ethernet requirements. The device is used for PC or embedded systems to substantially reduce electromagnetic interference (EMI). The device provides two differential (HCSL) spread spectrum outputs. The spread type and amount are configured via select pin. Using IDT’s patented Phase-Locked Loop (PLL) techniques, the device takes a 25 MHz crystal input and produces two pairs of differential outputs at 25 MHz, 100 MHz, 125 MHz or 200 MHz clock frequencies for HCSL, and 25 MHz or 100 MHz for LVDS. Features Packaged in 16-pin TSSOP RoHS 5 (green) or RoHS 6 (green and lead free) compliant packaging Supports HCSL or LVDS output levels Operating voltage of 3.3 V Input frequency of 25 MHz Jitter 60 ps (cycle-to-cycle) Spread Spectrum capability Industrial and commercial temperature ranges Block Diagram VDD 2 SS1:SS0 2 S1:S0 2 Control Logic Phase Lock Loop X1/ICLK 25 MHz crystal or clock X2 Clock Buffer/ Crystal Oscillator Optional tuning crystal capacitors 2 GND OE CLK0 CLK0 CLK1 CLK1 Rr(IREF) IDT® PCI-EXPRESS GEN1 CLOCK SOURCE 1 ICS557-03 REV R 121510 ICS557-03 PCI-EXPRESS GEN1 CLOCK SOURCE PCIE SSCG Pin Assignment S0 1 S1 2 SS0 3 X1/ICLK 4 X2 5 OE 6 GNDXD 7 SS1 8 16 VDDXD 15 CLK0 14 CLK0 13 GNDODA 12 VDDODA 11 CLK1 10 CLK1 9 IREF 16-pin (173 mil) TSSOP Pin Descriptions Output Select Table ...