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CY28RS400

Cypress Semiconductor
Part Number CY28RS400
Manufacturer Cypress Semiconductor
Description Clock Generator for ATI RS400 Chipset
Published Mar 26, 2005
Detailed Description CY28RS400 Clock Generator for ATI RS400 Chipset Features • Supports Intel CPU • Selectable CPU frequencies • Differen...
Datasheet PDF File CY28RS400 PDF File

CY28RS400
CY28RS400

Overview
CY28RS400 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 PD PLL2 SDATA SCLK I2C Logic Xin XOUT VDD_48 VDD_CPU USB_48 CPUT[0:2], CPUC[0:2], VSS_48 VDD_SRC VTT_PWRGD#/PD SRCT[0:5],SRCC[0:5] SCLK SDATA VDD_SRCS SRCST[0:1],SRCSC[0:1] FSC CLKREQ#0 VDD_PCI CLKREQ#1 PCI SRCT5 SRCC5 VDD_SRC VSS_SRC VDD_48 MHz SRCT4 SRCC4 SRCT3 USB_48 SRCC3 VSS_SRC VDD_SRC SRCT2 SRCC2 SRCT1 SRCC1 VSS_SRC SRCST1 SRCSC1 1 2 3 4 5 6 7 8 9 10 11 ...


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