ICS9248-199 Datasheet, PDF (3/21 Pages) Integrated Circuit Systems – Frequency Generator for SIS 735/740 with AMD K7 Processor

ICS9248-199
General Description
The ICS9248-199 is a single chip clock solution for desktop designs using the Intel Brookdale chipset with PC133
or DDR memory. It provides all necessary clock signals for such a system.
The ICS9248-199 is part of a whole new line of ICS clock generators and buffers called TCH™ (Timing Control Hub).
This part incorporates ICS's newest clock technology which offers more robust features and functionality. Employing
the use of a serially programmable I²C interface, this device can adjust the output clocks by configuring the frequency
setting, the output divider ratios, selecting the ideal spread percentage, the output skew, the output strength, and
enabling/disabling each individual output clock. M/N control can configure output frequency with resolution up to
0.1MHz increment.
Block Diagram
PLL2
X1
XTAL
X2
OSC
48MHz
24_48MHz
/2
REF (1:0)
2
SDATA
SCLK
FS (4:0)
PD#
PCI_STOP#
CPU_STOP#
SDRAM_STOP#
AGP_STOP#
AGP_SEL
PLL1
Spread
Spectrum
Control
Logic
Config.
Reg.
CPU
DIVDER
Stop
IOAPIC
DIVDER
SDRAM
DIVDER
Stop
Stop
PCI
DIVDER
Stop
AGP
DIVDER
CPUCLK
CPUCLKT0
CPUCLKC0
IOAPIC
SDRAM
PCICLK (4:0)
5
PCICLK_F
AGPCLK (1:0)
2
Power Groups
VDDCPU = CPU
VDDPCI = PCICLK_F, PCICLK
VDDSDR = SDRAM
VDD48 = 48MHz, 24MHz, fixed PLL
VDDA = Core, PLL, X1, X2
VDDAGP=AGP, REF
0376E—12/23/02
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