ICS950703 Datasheet, PDF (1/24 Pages) Integrated Circuit Systems – PROGRAMMABLE TIMING CONTROL HUB FOR P4

Integrated
Circuit
Systems, Inc.
ICS950703
Programmable Timing Control Hub^TM for P4^TM
Recommended Application:
Intel Tehema and Tehema-E Chipsets
Output Features:
• 4 Differential CPU Clock Pairs @ 3.3V
• 2 - 3V MREF clocks for memory reference seeds,
(separate single ended but 180 degrees out of phase)
• 4 - 66MHz 3V66 output
• 10 - 3V 33MHz PCI clocks
• 2 - 48MHz clocks (180 degrees out of phase)
• 2 - 14.318 reference output (180 degrees out of phase)
Key Specifications:
• 3V66 Output jitter <300ps
• CPU Output Jitter <200ps
• MREF Output jitter <250ps
Features/Benefits:
• QuadRom^TM frequency selection.
• Programmable asynchronous 3V66/PCI frequency.
• Programmable output frequency.
• Programmable output divider ratios.
• Programmable output rise/fall time.
• Programmable output skew.
• Programmable spread percentage for EMI control.
• Programmable watch dog safe frequency.
• Support I²C Index read/write and block read/write
operations.
• Uses external 14.318MHz reference input.
Frequency Table
Bit4
Bit3 Bit2 Bit1 Bit0 CPU MREF
Sel133/100 FS3 FS2 FS1 FS0 MHz MHz
0
0
0
0
0 90.00 45.00
0
0
0
0
1 100.00 50.00
0
0
0
1
0 100.90 50.45
0
0
0
1
1 103.00 51.50
0
0
1
0
0 105.00 52.50
0
0
1
0
1 108.00 54.00
0
0
1
1
0 110.00 55.00
0
0
1
1
1 112.00 56.00
0
1
0
0
0 115.00 57.50
0
1
0
0
1 118.00 59.00
0
1
0
1
0 120.00 60.00
0
1
0
1
1 122.00 61.00
0
1
1
0
0 125.00 62.50
0
1
1
0
1 127.00 63.50
0
1
1
1
0 130.00 65.00
0
1
1
1
1 133.60 66.80
1
0
0
0
0 120.00 60.00
1
0
0
0
1 133.33 66.67
1
0
0
1
0 _{133.90 66.95}
1
0
0
1
1 136.00 68.00
1
0
1
0
0 138.00 69.00
1
0
1
0
1 140.00 70.00
1
0
1
1
0 142.00 71.00
1
0
1
1
1 144.00 72.00
1
1
0
0
0 145.00 72.50
1
1
0
0
1 148.00 74.00
1
1
0
1
0 150.00 75.00
1
1
0
1
1 152.00 76.00
1
1
1
0
0 154.00 77.00
1
1
1
0
1 156.00 78.00
1
1
1
1
0 158.00 79.00
1
1
1
1
1 160.00 80.00
PCI
MHz
30.00
33.33
33.63
34.33
35.00
36.00
36.67
37.33
38.33
39.33
40.00
40.67
41.67
42.33
43.33
44.53
30.00
33.33
33.48
34.00
34.50
35.00
35.50
36.00
36.25
37.00
37.50
38.00
38.50
39.00
39.50
40.00
3V66
MHz
60.00
66.67
67.27
68.67
70.00
72.00
73.33
74.67
76.67
78.67
80.00
81.33
83.33
84.67
86.67
89.07
60.00
66.67
66.95
68.00
69.00
70.00
71.00
72.00
72.50
74.00
75.00
76.00
77.00
78.00
79.00
80.00
Pin Configuration
GND 1
56 VDDMREF
MULTSEL0/REF0 2
55 3VMREF
MULTSEL1/REF1 3
54 3VMREF_B
VDDREF 4
53 GNDMREF
X1 5
52 SCLK
X2 6
51 CPUCLKT3
GNDREF 7
50 CPUCLKC3
PCICLK0 8
PCICLK1 9
49 VDDCPU
48 CPUCLKT2
VDDPCI 10
47 CPUCLKC2
PCICLK2 11
46 GNDCPU
PCICLK3 12
45 CPUCLKT1
GNDPCI 13
44 CPUCLKC1
PCICLK4 14
43 VDDCPU
PCICLK5 15
42 CPUCLKT0
VDDPCI 16
41 CPUCLKC0
PCICLK6 17
40 GNDCPU
**FS2/PCICLK7 18
39 IREF
GNDPCI 19
**FS3/PCICLK8 20
38 AVDD
37 GND
**SEL100_133#/PCICLK9 21
36 VDD3V66
VDDPCI 22
35 3V66_3
SDATA 23
34 3V66_2
GND48 24
33 GND3V66
*FS0/48MHz_0 25
32 GND3V66
**FS1/48MHz_1 26
31 3V66_1
AVDD48 27
30 3V66_0
PD# 28
29 VDD3V66
56-SSOP
* Internal Pull-Up Resistor
** Internal Pull-Down Resistor
0690D—05/14/04