ICS9248-168 Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – AMD - K7™ Clock Generator for Mobile System

Integrated
Circuit
Systems, Inc.
ICS9248-168
AMD - K7™ Clock Generator for Mobile System
Recommended Application:
VIA KT133 style chipset
Output Features:
• 1 - Differential pair open drain CPU clocks
• 1 - CPU clock @ 3.3V
• 7 - SDRAM @ 3.3V
• 8 - PCI @ 3.3V,
• 1 - 48MHz, @ 3.3V fixed.
• 1 - 24/48MHz @ 3.3V
• 3 - REF @ 3.3V, 14.318MHz.
Features:
• Up to 153MHz frequency support
• Support power management: CPU stop and Power down
Mode from I²C programming.
• Spread spectrum for EMI control
(± 0.25% to ± 0.6% center, or 0 to -0.5% or -1.0% down
spread).
• Uses external 14.318MHz crystal
Pin Configuration
VDDREF
1
48
X1
2
47
X2
3
46
*FS2/PCICLK_F
4
45
*FS1/PCICLK0
5
44
VDDPCI
6
43
GND
7
42
PCICLK1
8
41
PCICLK2
9
40
PCICLK3
10
39
PCICLK4
11
38
PCICLK5
12
37
GND
13
36
VDDPCI
14
35
PCICLK6
15
34
*SDRAM_STOP#
16
33
*PCI_STOP#
17
32
BUFFER_IN
18
31
AVDD
19
30
GND
20
29
GND
21
28
*FS0/48MHZ
22
27
*SEL24_48#/24_48MHz
23
26
VDD48
24
25
REF0¹
REF1
REF2
GND
GND
VDD
CPUCLK²
CPUCLKT0²
CPUCLKC0²
CPU_STOP#*
PD#*
SDRAM0
SDRAM1
VDDSDR
GND
SDRAM2
SDRAM3
GND
VDDSDR
SDRAM4
SDRAM5
SDRAM_F
SCLK
SDATA
48-Pin 300mil SSOP
* Internal Pull-up Resistor of 120K to VDD
1 _{These outputs have double strength to drive 2 loads.}
2 _{These outputs can be set to 1.5X strength through I}2_C
Block Diagram
PLL2
X1
X2
SEL24_48#
SDATA
SCLK
FS (2:0)
PD#
CPU_STOP#
PCI_STOP#
SDRAM_STOP#
BUFFER_IN
XTAL
OSC
PLL1
Spread
Spectrum
Control
Logic
Config.
Reg.
/2
CPU
DIVDER
Stop
PCI
DIVDER
Stop
SDRAM
DRIVER
Stop
Functionality
48MHz
24_48MHz
REF (2:0)
CPUCLK
CPUCLKC0
CPUCLKT0
PCICLK (6:0)
PCICLK_F
SDRAM (5:0)
SDRAM_F
FS2 FS1 FS0 CPU PCI Spread Percentage
0
0
0 100.00 33.33 +/- 0.35% Center Spread
0
0
1 133.33 33.33 +/- 0.35% Center Spread
0
1
0 100.00 33.33 0 to - 0.5% Down Spread
0
1
1 133.33 33.33 0 to - 0.5% Down Spread
1
0
0 100.00 33.33 +/- 0.6% Center Spread
1
0
1 133.33 33.33 +/- 0.6% Center Spread
1
1
0 90.00 30.00 +/- 0.25% Center Spread
1
1
1 120.00 30.00 +/- 0.25% Center Spread
9248-168 Rev B 01/09/01
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ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
information being relied upon by the customer is current and accurate.