CY28RS400 Datasheet | Cypress

Clock Generator for ATI RS400 Chipset Features - Supports Intel CPU - Selectable CPU frequencies - Differential CPU clock pairs - 100-MHz differential SRC clocks - 48-MHz USB clock - 33-MHz PCI clock - Low-voltage frequency select input - I2C support with readback capabilities - Ideal Lexmark Spread Spectrum profile for maximum electromagnetic interference (EMI) reduction - 3.3V power supply - 56-pin SSOP and TSSOP packages CPU x3 SRC x8 PCI x1 REF x3 USB_48 x1 Block Diagram XIN XOUT CPU_STP# CLKREQ[0:1]# FS_[C:A] VTT_PWRGD# IREF Pin Configuration VDD_REF REF[0:2] XTAL OSC PLL1 PLL Ref Freq Divider Network PLL2 SDATA SCLK I2C Logic Xin XOUT VDD_48 VDD_CPU USB_48...