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ICS950902YFLF-T

Description
Programmable Timing Control Hub⑩ for P4⑩
File Size185KB,20 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS950902YFLF-T Overview

Programmable Timing Control Hub⑩ for P4⑩

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 I
2
C 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 I
2
C Index read/write and block read/write
operations.
Uses external 14.318MHz crystal.
Frequency Table
FS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
FS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPUCLK
MHz
160.00
164.00
166.60
170.00
175.00
180.00
185.00
190.00
66.80
100.90
133.60
200.40
66.60
100.00
200.00
133.30
AGP
MHz
80.00
82.00
66.60
68.00
70.00
72.00
74.00
76.00
66.80
67.27
66.80
66.80
66.60
66.60
66.60
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
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
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
*MULTSEL/PCICLK2 12
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
MULTISEL0
Board Target
Trace/Term Z
50 ohms
50 ohms
Reference R,
Iref =
V
DD
/(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
SDATA 28
0
1
1.0V @ 50
0.7V @ 50
56-Pin 300-mil SSOP & 240-mil TSSOP
* Internal 120K pull-up resistor to VDD.
** Internal 120K pull-down resistor to GND.
0475G—03/23/04
ICS950902

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