CY28551

CY28551 Universal Clock Generator for Intel, VIA, and SIS® Features Compliant to Intel® CK505 Selectable CPU clock buffer type for Intel P4 or K8 selection Selectable CPU frequencies Universal clock to support Intel, SiS and VIA platform 0.7V Differential CPU clock for Intel CPU 3.3V Differential CPU clock for AMD K8 100 MHz differential SRC clocks 96 MHz differential dot clock 133 MHz Link clock 48 MHz USB clock 33 MHz PCI clocks Dynamic Frequency Control Dial-A-Frequency® WatchDog Timer Two Independent Overclocking PLLs 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 64-pin QFN package CPU x2 SRC x8 SATA x1 PCI x7 REF x3 LINK x2 DOT96 x1 24_48M x1 48M x1 Block Diagram VDD_REF Xin Xout Pin Configuration REF[2:0] VDD_CPU CPUT[1:0] CPUC[1:0] VDD_PCIEX PCIET [8:1] PCIEC[8:1] VDD_SATA PCI1/CLKREQ#A PCI0/CLKREQ#B **DOC1 PCI4/*SELP4_K8 REF1 /**FSC PCI5/*SEL0 PCI2/**FSA PLL Reference REF2/**MODE 14.318M Hz Crystal RESET_I#/ SRESET# REF0/ **FSD PC3/*FSB VSSREF VDDPCI VSSPCI PLL1 CPU DOC[2:1] FS[D:A] SEL_P4_K8 Divider 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 PCI6_F 1 VDD48 2 **SEL24_48 / 24_48M 3 **SEL1/48M 4 VSS48 5 VDDDOT 6 LINK0/DOT96T/SATAT 7 LINK1/DOT96C/SATAC 8 VSSDOT 9 VDDSATA 10 SATAT/PCIEXT0 11 SATAC/PCIEXC0 12 VSSSATA 13 PCIEXT1 14 PCIEXC1 15 VSSPCIE 16 VSSPCIE VDDPCIE PC...