ICS950201
Integrated
Circuit
Systems, Inc.
Programmable Timing Control Hub™ for P4™
Recommended Application:
CK-408 clock for Intel® 845 chipset 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:
•
Supports spread spectrum modulation,
down spread 0 to -0.5%.
•
Efficient power management scheme through PD#,
CPU_STOP# and PCI_STOP#.
•
Uses external 14.318MHz crystal
•
Stop clocks and functional control available through
I2C interface.
Key Specifications:
•
CPU Output Jitter <150ps
•
3V66 Output Jitter <250ps
•
CPU Output Skew <100ps, programmable over 800 ps
with groups CPU0,1 and CPU2.
Block Diagram
Pin Configuration
56-Pin SSOP & TSSOP
* These inputs have 150K internal pull-up resistor to VDD.
Frequency Table
FS2 FS1 FS0
CPU
(MHz)
3V66
(MHz)
66Buff[2:0]
3V66[4:2]
(MHz)
PCI_F
PCI
(MHz)
0
0
66.66
66.66
66.66
33.33
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
Mid
1
0
Reserved Reserved Reserved
Reserved
Mid
0460I—12/13/04
0
0
1
1
Reserved Reserved Reserved
Reserved
TCLK/8
