ICS950227 Datasheet, PDF (1/17 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4

Integrated
Circuit
Systems, Inc.
ICS950227
Programmable Timing Control Hub™ for P4™
Recommended Application:
CK-408 clock Intel® 845 with P4 processor.
Output Features:
• 3 Differential CPU Clock Pairs @ 3.3V
• 7 PCI (3.3V) @ 33.3MHz
• 3 PCI_F (3.3V) @ 33.3MHz
• 1 USB (3.3V) @ 48MHz
• 1 DOT (3.3V) @ 48MHz
• 1 REF (3.3V) @ 14.318MHz
• 5 3V66 (3.3V) @ 66.6MHz
• 1 VCH/3V66 (3.3V) @ 48MHz or 66.6MHz
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 <150ps
• 3V66 Output Jitter <250ps
• CPU Output Skew <100ps
Pin Configuration
VDDREF 1
X1 2
X2 3
GND 4
PCICLK_F0 5
PCICLK_F1 6
PCICLK_F2 7
VDDPCI 8
GND 9
PCICLK0 10
PCICLK1 11
PCICLK2 12
PCICLK3 13
VDDPCI 14
GND 15
PCICLK4 16
PCICLK5 17
PCICLK6 18
VDD3V66 19
GND 20
3V66_2 21
3V66_3 22
3V66_4 23
3V66_5 24
*PD# 25
VDDA 26
GND 27
Vtt_PWRGD# 28
56 REF
55 FS1
54 FS0
53 CPU_STOP#*
52 CPUCLKT0
51 CPUCLKC0
50 VDDCPU
49 CPUCLKT1
48 CPUCLKC1
47 GND
46 VDDCPU
45 CPUCLKT2
44 CPUCLKC2
43 MULTSEL0*
42 IREF
41 GND
40 FS2
39 48MHz_USB
38 48MHz_DOT
37 VDD48
36 GND
35 3V66_1/VCH_CLK
34 PCI_STOP#*
33 3V66_0
32 VDD3V66
31 GND
30 SCLK
29 SDATA
56-Pin 300-mil SSOP
* These inputs have 150K internal pull-up resistor to VDD.
Block Diagram
PLL2
X1
XTAL
OSC
WDEN
PD#
CPU_STOP#
PCI_STOP#
MULTSEL0
FS (2:0)
SDATA
SCLK
Vtt_PWRGD#
PLL1
Spread
Spectrum
Control
Logic
Config.
Reg.
0641D—07/03/03
CPU
DIVDER
Stop
PCI
DIVDER
Stop
3V66
DIVDER
Frequency Table
48MHz_USB
48MHz_DOT
3V66_1/VCH_CLK
REF
3 ^{CPUCLKT (2:0)}
3 ^{CPUCLKC (2:0)}
PCICLK (6:0)
7
PCICLK_F (2:0)
3
3V66 (5:2,0)
5
FS2 FS1 FS0
CPU
(MHz)
3V66
(MHz)
66Buff[2:0]
3V66[4:2]
(MHz)
PCI_F
PCI
(MHz)
0 0 0 66.66 66.66
66.66
33.33
0 0 1 100.00 66.66
66.66
33.33
0 1 0 200.00 66.66
66.66
33.33
0 1 1 133.33 66.66
66.66
33.33
Mid 0 0 Tristate Tristate Tristate Tristate
Mid 0 1 TCLK/2 TCLK/4 TCLK/4 TCLK/8
Mid 1 0 Reserved Reserved Reserved Reserved
Mid 1 1 Reserved Reserved Reserved Reserved
I REF