
2
Integrated
Circuit
Systems, Inc.
ICS950218
0466B—03/17/04
The ICS950218 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 ICS950218 is part of a whole new line of ICS clock generators and buffers called TCH (Timing Control Hub). ICS is the
first to introduce a whole product line which offers full programmability and flexibility on a single clock device. This part
incorporates ICS's newest clock technology which offers more robust features and functionality. Employing the use of a
serially programmable I
2C 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. TCH also incorporates ICS's Watchdog Timer technology and a reset feature to provide a safe setting
under unstable system conditions. M/N control can configure output frequency with resolution up to 0.1MHz increment. With
all these programmable features ICS's, TCH makes mother board testing, tuning and improvement very simple.
General Description
Block Diagram
PLL2
PLL1
Spread
Spectrum
48MHz
PCICLK (9:0)
3V66 (2:0)
24_48MHz
X1
X2
XTAL
OSC
CPU
DIVDER
PCI
DIVDER
3V66
DIVDER
PD#
MULTSEL(1:0)
SDATA
SCLK
Vtt_PWRGD#
SEL 48_24#
SEL 66_48#
FS (4:0)
I REF
RESET#
Control
Logic
Config.
Reg.
REF (1:0)
3
10
4
3
CPUCLKT (2:0)
CPUCLKC (2:0)
/ 2
3V66
DIVDER
3V66_48MHz