ICS950818 Datasheet, PDF (1/20 Pages) Integrated Circuit Systems – Frequency Generator with 200MHz Differential CPU Clocks

Integrated
Circuit
Systems, Inc.
ICS950818
Frequency Generator with 200MHz Differential CPU Clocks
Recommended Application:
Pin Configuration
CK-408 clock for Brookdale/Odem/Montara-GM for P4/Banias
processor.
X1 1
X2 2
48 VDDREF
47 REF
Output Features:
GND 3
46 FS1
• 2 - Differential CPU Clock Pairs @ 3.3V
• 8 - PCI (3.3V) @ 33.3MHz including 2 1x/2x
selectable PCI clocks
• 3 - PCI_F/PCI selectable (3.3V) @ 33.3MHz
• 1 - USB (3.3V) @ 48MHz, 1 DOT (3.3V) @ 48MHz
• 1 - REF (3.3V) @ 14.318MHz
• 4 - 3V66 (3.3V) @ 66.6MHz
• 1 - VCH/3V66 (3.3V) @ 48MHz or 66.6MHz
Features:
PCICLK_F0/PCICLK6 4
PCICLK_F1/PCICLK7 5
PCICLK_F2/PCICLK8 6
GND 7
PCICLK0 8
PCICLK1 9
*PCICLK2 10
VDDPCI 11
*PCICLK3 12
PCICLK4 13
45 CPU_STOP#
44 VDDCPU
43 CPUCLKT0
42 CPUCLKC0
41 GND
40 VDDCPU
39 CPUCLKT1
38 CPUCLKC1
37 IREF
36 FS0
• Selectable 1X or 2X strength for REF and PCI via
SMBus interface
PCICLK5 14
VDD3V66 15
35 48MHz_USB
34 48MHz_DOT
• Programmable group to group skew
GND 16
33 VDD48
• Linear programmable frequency and spreading %
3V66_2 17
32 GND
• Efficient power management scheme through PD#,
CPU_STOP# and PCI_STOP#.
3V66_3 18
3V66_4 19
31 3V66_1/VCH_CLK
30 PCI_STOP#
• Uses external 14.318MHz crystal
PCICLK9 20
29 PCICLK10
• Stop clocks and functional control available through
SMBus interface.
PD# 21
VDDA 22
28 VDD3V66
27 GND
Key Specifications:
• CPU Output Jitter <150ps
GND 23
Vtt_PWRGD# 24
26 SCLK
25 SDATA
• 3V66 Output Jitter <250ps
• CPU Output Skew <100ps
48-Pin 6.10 mm. Body, 0.50 mm. pitch TSSOP
*These outputs have selectable 1X/2X strength via SMBus
Block Diagram
PLL2
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
Vtt_PWRGD#
PD#
CPU_STOP#
PCI_STOP#
FS (1:0)
SDATA
SCLK
Control
Logic
Config.
Reg.
0825F—11/19/03
CPU
DIVDER
Stop
PCI
DIVDER
Stop
3V66
DIVDER
48MHz_USB
48MHz_DOT
3V66 (4:2)
REF
3 ^{CPUCLKT (1:0)}
3 ^{CPUCLKC (1:0)}
PCICLK (10:0)
7
PCICLK_F (2:0)
3
Frequency Select Table 1
Freq
Sel
FS FS
10
CPU MHz
3V66(4:1)
MHz
PCI MHz
00
01
10
11
100.00
166.67
133.33
200.00
66.66
66.66
66.66
66.66
33.33
33.33
33.33
33.33
USB/DOT
REF MHz
MHz
14.318
14.318
14.318
14.318
48.008
48.008
48.008
48.008
3V66_1/VCH_CLK
I REF