ICS950902 Datasheet, PDF (1/20 Pages) Integrated Circuit Systems – Programmable Timing Control Hub™ for P4™

Integrated
Circuit
Systems, Inc.
ICS950902
Programmable Timing Control Hub™ for P4™
Recommended Application:
VIA P4X/P4M/KT/KN266/333 style chipsets.
Output Features:
• 1 - Pair of differential CPU clocks @ 3.3V (CK408)/
1 - Pair of differential open drain CPU clocks (K7)
• 1 - Pair of differential push pull CPU_CS clocks @ 2.5V
• 3 - AGP @ 3.3V
• 7 - PCI @ 3.3V (1 - Free running)
• 1 - 48MHz @ 3.3V fixed
• 1 - 24_48MHz @ 3.3V (Default 48MHz I²C select only)
• 2 - REF @ 3.3V, 14.318MHz
• 12 - SDRAM (6 pair - DDR) selectable
Key Specifications:
• CPU_CS - CPUT/C: <±250ps
• CPU_CS - AGP: <±250ps
• CPU - DDR/SD: <±250ps
• PCI - PCI: <500ps
• CPU - PCI: Min = 1.0ns, Typ = 2.0ns, Max = 4.0ns
Features/Benefits:
• Programmable output frequency.
• Programmable output divider ratios.
• Programmable output rise/fall time.
• Programmable output skew.
• Programmable spread percentage for EMI control.
• DDR output buffer supports up to 200MHz.
• 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.
Frequency Table
FS3
FS2
FS1
FS0
CPUCLK
MHz
AGP
MHz
0
0
0 0 160.00 80.00
0
0
0
1 164.00 82.00
0
0
1 0 166.60 66.60
0
0
1 1 170.00 68.00
0
1
0
0 175.00 70.00
0
1
0
1 180.00 72.00
0
1
1 0 185.00 74.00
0
1
1
1 190.00 76.00
1
0
0 0 66.80 66.80
1
0
0
1 100.90 67.27
1
0
1 0 133.60 66.80
1
0
1 1 200.40 66.80
1
1
0
0
66.60 66.60
1
1
0
1 100.00 66.60
1
1
1 0 200.00 66.60
1
1
1 1 133.30 66.60
PCICLK
MHz
40.00
41.00
33.30
34.00
35.00
36.00
37.00
38.00
33.40
33.63
33.40
33.40
32.30
33.30
33.30
33.30
MULTISEL0
Board Target
Trace/Term Z
0
50 ohms
1
50 ohms
Reference R,
Iref =
V_DD/(3*Rr)
Rr = 221 1%,
Iref = 5.00mA
Rr = 475 1%,
Iref = 2.32mA
Output
Current
Voh @ Z
Ioh = 4* I REF 1.0V @ 50
Ioh = 6* I REF 0.7V @ 50
0475G—03/23/04
Pin Configuration
*FS0/REF0 1
GND 2
X1 3
X2 4
VDDAGP 5
*MODE/AGPCLK0 6
*SEL_408/K7/AGPCLK1 7
*(PCI_STOP#)AGPCLK2 8
GNDAGP 9
**FS1/PCICLK_F 10
**SEL_SDR/DDR#/PCICLK1 11
*MULTSEL/PCICLK2 12
GNDPCI 13
PCICLK3 14
PCICLK4 15
VDDPCI 16
PCICLK5 17
*(CLK_STOP#)PCICLK6 18
GND48 19
*FS3/48MHz 20
*FS2/24_48MHz 21
AVDD48 22
VDD 23
GND 24
IREF 25
*(PD#)RESET# 26
SCLK 27
SDATA 28
56 Vtt_PWRGD#**/REF1
55 VDDREF
54 GND
53 CPUCLKT/CPUCLKODT
52 CPUCLKC/CPUCLKODC
51 VDDCPU3.3
50 VDDCPU2.5
49 CPUC_CS
48 CPUT_CS
47 GND
46 FBOUT
45 BUF_IN
44 DDRT0/SDRAM0
43 DDRC0/SDRAM1
42 DDRT1/SDRAM2
41 DDRC1/SDRAM3
40 VDD3.3_2.5
39 GND
38 DDRT2/SDRAM4
37 DDRC2/SDRAM5
36 DDRT3/SDRAM6
35 DDRC3/SDRAM7
34 VDD3.3_2.5
33 GND
32 DDRT4/SDRAM8
31 DDRC4/SDRAM9
30 DDRT5/SDRAM10
29 DDRC5/SDRAM11
56-Pin 300-mil SSOP & 240-mil TSSOP
* Internal 120K pull-up resistor to VDD.
** Internal 120K pull-down resistor to GND.