557G-05ALF

QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE DATASHEET ICS557-05A Description Features The ICS557-05A is a spread-spectrum clock generator that supports PCI-Express requirements. It is used in PC or embedded systems to substantially reduce electro-magnetic interference (EMI). The device provides four differential HCSL or LVDS high-frequency outputs with spread spectrum capability. The output frequency and spread type are selectable using external pins. Block Diagram Packaged in 20-pin TSSOP RoHS 5 (green) or RoHS 6 (green and lead free) complaint package Supports PCI-Express applications Four differential spread spectrum clock outputs Spread spectrum for EMI reduction Uses external 25 MHz clock or crystal input Power down pin turns off chip OE control tri-states outputs Spread and frequency selection via external pins Spread Bypass option available Industrial temperature range available For PCIe Gen2 applications, see the 5V41066 For PCIe Gen3 applications, see the 5V41236 VDD 2 PD OE 3 SEL[2:0] X1 25 MHz crystal or clock X2 Optional tuning crystal capacitors Spread Spectrum/ Output clock selection Clock Oscillator Spread Spectrum Circuitry PLL Clock Synthesis 2 GND Rr(IREF) CLKOUTA CLKOUTA CLKOUTB CLKOUTB CLKOUTC CLKOUTC CLKOUTD CLKOUTD IDT® QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE 1 ICS557-05A REV O 112111 ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE Pin Assignment VDDXD 1 S0 2 S1 3 S2 4 X1 ...