Programmable Timing Control Hub
Description
Integrated Circuit Systems, Inc.
ICS950602
Programmable Timing Control Hub™ for PII/III™
Recommended Application: VIA Mobile PL133T and PLE133T Chipsets.
Output Features: • 2 - CPU clocks @ 2.
5V • 1 - Pairs of differential CPU clocks @ 3.
3V • 7 - PCI including 1 free running @ 3.
3V • 7 - SDRAM @ 3.
3V • 1 - 48MHz @ 3.
3V fixed • 1 - 24_48MHz selectable @ 3.
3V • 2 - REF @ 3.
3V, 14.
318MHz Features/Benefits: • Programmable output frequency.
• Programmable output divider ratios.
• Programmable output rise/fall time.
• Programmable output skew.
• Programmable spread percentage for EMI control.
• Watchdog timer technology to reset system if system malfunctions.
• Programmable watch dog safe frequency.
• Support I2C Index read/write and block read/write operations.
• Uses external 14.
318MHz crystal.
Key Specifications: • CPU Output Jitter <200ps • CPU Output Skew <175ps • PCI to PCI Output Skew <500ps
GND *FS2/REF1 REF0 Vtt_PWRGD# VDDREF GND X1 X2 VDDPCI *FS4/PCICLK_F *FS3/PCICLK0 GND PCICLK1 PCICLK2 PCICLK3 PCICLK4 PCICLK5 SDRAM_IN *CPU_STOP# *PCI_STOP# *PD# **MULTISEL GND SDATA
Pin Configuration
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 CPUCLK0 CPUCLK1 VDDCPU_2.
5 VDDCPU_3.
3 CPUCLKT CPUCLKC GND RESET# I REF SDRAM6 GND SDRAM0 SDRAM1 VDDSDRAM SDRAM2 SDRAM3 GND SDRAM4 SDRAM5 VDDSDRAM AVDD48 48MHz/FS0* 24_48MHz/FS1* SCLK
48-Pin SSOP & TSSOP
* Internal Pull-up resistor of 120K to VDD ** these inputs have 120K internal pull-down to GND
Block Diagram
Host Swing Select Functions
MULTISEL0 0 1 Board Target Trace/Term Z 50 ohms 50 ohms Reference R, Iref = VDD/(3*Rr) Rr = 221 1%, Iref = 5.
00mA Rr = 475 1%, Iref = 2.
32mA Output Current Ioh = 4* I REF Ioh = 6* I REF Voh @ Z 1.
0V @ 50 0.
7V @ 50
0469B—12/18/02
ICS950602
Integrated Circuit Systems, Inc.
ICS950602
General Description
The ICS950602 is a single chip clock solution for VIA Mobile PL133T and PLE133T chipsets.
It provides all ...
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