CY28404

www.DataSheet4U.com CY28404 CK409-Compliant Clock Synthesizer Features Supports Intel Springdale/Prescott (CK409) Selectable CPU frequencies 3.3V power supply Nine copies of PCI clock Four copies 3V66 clock with optional VCH Three copies 48-MHz clock Three copies REF clock Two differential CPU clock pairs Support SMBus/I2C Byte, Word, and Block Read/Write Dial-A-Frequency Ideal Lexmark Spread Spectrum profile for maximum electromagnetic interference (EMI) reduction 48-pin SSOP package Table 1. Frequency Table CPU x2 3V66 x4 PCI x9 REF x3 48M x3 Block Diagram XIN XOUT Pin Configuration **FS_A/REF_0 **FS_B/REF_1 VDD_REF VDD_CPU XIN CPUT(0:1), CPUC(0:1) XOUT VSS_REF *FS_C/PCIF0 *FS_D/PCIF1 *FS_E/PCIF2 VDD_PCI VSS_PCI VDD_3V66 PCI0 3V66_(0:2) PCI1 PCI2 VDD_PCI PCI3 PCIF(0:2) VDD_PCI VSS_PCI PCI(0:5) PCI4 PCI5 RESET#/PD# 3V66_3/VCH *SEL24#/24_48MHz DOT_48 USB_48 VDD_48MHz VSS_48 DOT_48 USB_48 24_48MHz 2 XTAL OSC PLL 1 PLL Ref Freq Divider Network VDD_REF REF(0:2) FS_(A:E) VTT_PWRGD# IREF SEL24# SELVCH PLL2 2 MODE PD# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 REF_2 VDDA VSSA IREF VSS_CPU CPUT1 CPUC1 VDD_CPU CPUT0 CPUC0 VSS DNC*** DNC*** VDD VTT_PWRGD# SDATA* SCLK* 3V66_0 3V66_1 VSS_3V66 VDD_3V66 3V66_2/MODE* 3V66_3/VCH/SELVCH** VDD_48 ~ SSOP-48 * 150k Internal Pull-up ** 150k Internal Pull-down *** Do Not Connect CY28404 SDATA SCLK I2C Logic WD...