ICS951702 Datasheet, PDF (1/12 Pages) Integrated Device Technology – PIII™ System Clock Chip for DDR SDRAM

Integrated
Circuit
Systems, Inc.
ICS951702
Advance Information
PIII™ System Clock Chip for DDR SDRAM
Recommended Application:
1644 and 1644T applications using DDR
Output Features:
• 7 - Differential pairs DDR SDRAM clocks
• 3 - CPU @ 2.5V (1 - Free running)
• 8 - PCI @ 3.3V (1 - Free running and 1 - 2 X optional)
• 2 - AGP @ 3.3V
• 1 - IOAPIC @ 2.5V
• 1 - 48MHz, @3.3V
• 1 - REF @ 3.3V
Features:
• Up to 147MHz frequency support
• Power management through PD#
• Spread spectrum for EMI control (0 to -0.5% down
spread, ± 0.25% center spread).
• Uses external 14.318MHz crystal
Skew Specifications:
• CPU - CPU: <250ps
• PCI - PCI: <500ps
• SDRAM - SDRAM: <250ps
• AGP - AGP: <250ps
• PCI - AGP: <750ps
• CPU - SDRAM: <750ps
• CPU - PCI: <3ns
Pin Configuration
VDDL 1
IOAPIC 2
GND 3
X1 4
X2 5
AVDD 6
**FS0/REF 7
VDD 8
**FS1/AGP0 9
AGP1 10
GND 11
**FS2/PCI_F 12
PCICLK0 13
PCICLK1 14
PCICLK2 15
GND 16
VDD 17
PCICLK3 18
PCICLK4 19
PCICLK5 20
GND 21
VDD 22
1_{PCICLK6 23}
*PCI_STOP# 24
*CPU_STOP# 25
*Vtt_PWRGD/PD# 26
VDD 27
**FS3/48MHz 28
56 VDDL
55 CPUCLK_F
54 CPUCLK0
53 CPUCLK1
52 GND
51 DDRT0
50 DDRC0
49 GND
48 VDDL
47 DDRT1
46 DDRC1
45 DDRT2
44 DDRC2
43 VDDL
42 GND
41 DDRT3
40 DDRC3
39 DDRT4
38 DDRC4
37 GND
36 VDDL
35 DDRT5
34 DDRC5
33 DDRT6
32 DDRC6
31 SCLK
30 SDATA
29 GND
56-Pin 240 mil TSSOP
Notes:
* Internal Pull-up Resistor of 120K to VDD
** Internal Pull-down of 120K to GND
1. PCICLK6 is selectable 2X via I²C
Block Diagram
PLL2
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
Vtt_PWRGD/PD#
MODE
SDATA
SCLK
FS (3:0)
Control
Logic
Config.
Reg.
CPU
DIVDER
Stop
SDRAM
DIVDER
PCI
DIVDER
Stop
AGP
DIVDER
48MHz
REF0
IOAPIC
CPUCLK (1:0)
2
CPUCLK_F
DDRC (6:0)
7
DDRT (6:0)
7
PCICLK (6:0)
5
PCICLK_F
AGP (1:0)
2
Functionality
FS3 FS2 FS1
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
1
1
0
1
1
0
1
1
1
1
1
1
FS0 CPU SDRAM
0 66.66 66.66
1 66.66 100.00
0 100.00 66.66
1 100.00 100.00
0 100.00 133.33
1 133.33 66.66
0 133.33 100.00
1 133.33 133.33
0 66.66 66.66
1 66.66 100.00
0 100.00 66.66
1 100.00 100.00
0 100.00 133.33
1 133.33 66.66
0 133.33 100.00
1 133.33 133.33
0664—07/29/02
Note:
PCICLK = 33.33MHz
AGP = 66.66MHz
ADVANCE INFORMATION documents contain information on products in the formative or design phase development. Characteristic data and other specifications are design goals.
ICS reserves the right to change or discontinue these products without notice. Third party brands and names are the property of their respective owners.