ICS952301

Integrated Circuit Systems, Inc. ICS952301 Advance Information Frequency Timing Generator for Transmeta Systems Recommended Application: Transmeta Output Features: 1CPU up to 66.6MHz & overclocking of 66MHz. 7 PCI (3.3V) @ 33.3MHz (all are free running selectable) w/ 2 selectable 1X/2X. 1 REF (3.3V) at 14.318MHz. 1 48MHz (3.3V). 1 24_48MHz selectable output. Pin Configuration GNDREF X1 X2 PD# PCICLK0 PCICLK1 GNDPCI VDDPCI PCICLK21 PCICLK3 PCICLK41 GNDPCI VDDPCI PCICLK5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDDREF REF/ 1X or 2X Programmable* CPU_STOP# VDDCPU/CORE GNDCPU/CORE CPUCLK0 PCI_STOP# SCLK VDD48 GND48 48MHz 24-48MHz/Sel 48_24#* SDATA PCICLK6 Features: Supports Spread Spectrum modulation for CPU and PCI clocks, default -2.0% downspread. Efficient Power management scheme through stop clocks and power down modes. Uses external 14.318MHz crystal, no external load cap required for CL=18pF crystal. 28-pin TSSOP package, 4.40mm (173mil). Skew Characteristics: PCI – PCI < 500ps CPU(early) – PCI = 1.5ns – 4ns. 28-Pin 173mil TSSOP Note: ^ Internal Pulldown Resistor * Internal Pullup Resistor 1 1X/2X Programmable Block Diagram X1 X2 XTAL OSC REF STOP CPU CPU PLL PCI DIV STOP PCI(6:0) SCLOCK SDATA PD# PCI_STOP# SEL48_24# CPU_STOP# Control Logic 48MHz PLL STOP 48MHz Power Groups VDD_Core, GND_Core = PLL core VDDREF, GNDREF = REF, X1, X2 VDDPCI, GNDPCI = PCICLK (6:0) VDD48, GND48 = 48MHz (1:0) Pentium is a tra...