ICS9250-50 GND48 VDD48 SEL24 GND3V66 3V66-0 3V66-1 3V66-2 VDD3V66 SDRAM11

Integrated Circuit Systems, Inc. Frequency Generator & Integrated Buffers for PIII & TualatinTM Block Diagram 48MHz

ICS9250-50 ICS9250-50 Integrated Circuit Systems, Inc. Frequency Generator & Integrated Buffers for PIII & TualatinTM Block Diagram 48MHz 24_48MHz /2 XTAL OSC PLL1 Spread Spectrum REF0 CPU DIVDER 2 12 Config. SDRAM_F IOAPIC DIVDER IOAPIC 0594A-07/08/02 PCI DIVDER 8 3V66 DIVDER Reg. 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 1 REF0/FS4* VDDLAPIC IOAPIC VDDLCPU CPUCLK0 CPUCLK1 GNDLCPU GNDSDR SDRAM0 SDRAM1 SDRAM2 VDDSDR SDRAM3 SDRAM4 SDRAM5 GNDSDR SDRAM6 SDRAM7 SDRAM_F VDDSDR GND48 GND48 1 24_48MHz/FS2 * 1 48MHz/FS3* VDD48 VDD48 VDDSDR SDRAM8 SDRAM9 GNDSDR 56-Pin 300 mil SSOP 1. These pins will have 1.5 to 2X drive strength. * 120K ohm pull-up to VDD on indicated inputs. FS4 FS3 FS2 FS1 FS0 CPU SDRAM 0 0 0 0 0 66.67 100.00 0 1 0 0 0 100.00 100.00 1 0 0 0 0 133.33 133.33 1 1 0 0 0 133.33 100.00 3 PCICLK (7:0) 3V66 (2:0) 3V66 66.67 66.67 66.67 66.67 PCI 33.33 33.33 33.33 33.33 For other hardware/I2C selectable frequencies please refer to Byte 0 frequency select register. SDRAM (11:0) Control Logic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 CPUCLK (1:0) SDRAM DIVDER FS(4:0) PD# Vtt_PWRGD SEL24 SEL24_48# SDATA SCLK VDDA X1 X2 GNDA GND3V66 GND3V66 3V66-0 3V66-0 3V66-1 3V66-1 3V66-2 3V66-2 VDD3V66 VDD3V66 VDDPCI 1 *FS0/PCICLK0 1 *FS1/PCICLK1 1 *SEL24 SEL24_48#/PCICLK2 GNDPCI PCICLK3 PCICLK4 PCICLK5 VDDPCI PCICLK6 PCICLK7 GNDPCI Vtt_PWRGD/PD# SCLK SDATA VDDSDR SDRAM11 SDRAM11 SDRAM10 SDRAM10 GNDSDR Functionality PLL2 X1 X2 Pin Configuration ICS9250-50 ICS9250-50 Recommended Application: 815B Solano B step style chipset Output Features: · 2 - CPUs @ 2.5V, up to 133MHz. · 13 - SDRAM @ 3.3V, up to 133MHz. · 3 - 3V66 @ 3.3V, 2x PCI MHz. · 8 - PCI @ 3.3V · 1 - 48MHz, @ 3.3V fixed · 1 - 24/48MHz @ 3.3V · 1 - REF @ 3.3V, 14.318MHz. · 1 - IOAPIC @ 2.5V 16.67MHz. Features: · Support PC133 PC133 SDRAM. · Up to 133MHz frequency support · Support power management through PD# · Spread spectrum for EMI control (± 0.25% Center Spread or 0 to -0.5% down spread) · Uses external 14.318MHz crystal · FS pins for frequency select Key Specifications: · CPU Output Jitter: