ICS932S203 Datasheet, PDF (1/17 Pages) Integrated Circuit Systems – Frequency Generator with 133MHz Differential CPU Clocks

Integrated
Circuit
Systems, Inc.
ICS932S203
Frequency Generator with 133MHz Differential CPU Clocks
Recommended Application:
Servers based on Intel CK408 processors
Output Features:
• 4 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
• 1 3V66 (3.3V) @ 66.6MHz
• 1 VCH/3V66 (3.3V) @ 48MHz or 66.6MHz
• 3 66MHz_OUT/3V66 (3.3V) @ 66.6MHz_IN
or 66.6MHz
• 1 66MHz_IN/3V66 (3.3V) @ Input/66MHz
Features:
• Supports spread spectrum modulation,
down spread 0 to -0.5%.
• Efficient power management scheme through PD#
and PCI_STOP#.
• Uses external 14.318MHz crystal
• Stop clocks and functional control available through
SMBus interface.
Key Specifications:
• CPU Output Jitter <150ps
• 3V66 Output Jitter <250ps
• CPU Output Skew <150ps
Pin Configuration
56-Pin 300mil SSOP/TSSOP
* These inputs have 150K internal pull-up resistor to VDD.
Block Diagram
Functionality
FS1
FS0
CPU
(MHz)
1 0 100
1 1 133.3
0 0 100
0 1 133.3
mid 0 Hi-Z
mid 1 Tclk/2
3V66
(MHz)
66.6
66.6
66.6
66.6
Hi-Z
Tclk/4
66Buff[2:0]
3V66[4:2]
(MHz)
66.6 In path
66. In path
66.6
66.6
Hi-Z
Tclk/4
PCI_F
PCI
(MHz)
66.6 in/2
66.6 in/2
33.3
33.3
Hi-Z
Tclk/8
0601E—12/22/04