Integrated
Circuit
Systems, Incꢀ
ICS9248-143
Frequency Generator & Integrated Buffers for PENTIUM II/IIITM
& K6
RecommendedApplication:
Pin Configuration
440BX, MX,VIAApollo Pro 133,Apollo Pro Media
or MVP4 style chip set, for Note book applications'
OutputFeatures:
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDREF
*SPREAD/REF0
GNDREF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
REF1/FS2*
VDDLCPU
CPUCLK_F
CPUCLK0
GNDLCPU
CPUCLK1
CPUCLK2
CLK_STOP#
GNDSDR
SDRAM_F
SDRAM0
SDRAM1
VDDSDR
SDRAM2
SDRAM3
GNDSDR
SDRAM4
4-CPUs@2'5V/3'3V
including 1 free running CPUCLK_F
X1
X2
VDDPCI
9 - SDRAM @ 3'3V
7 - PCI @ 3'3V, including 1 free running PCICLK_F
1-PCIEarly@3'3V
1-48MHz, @3'3Vfixed'
1-24/48MHz @3'3V
*CPU2.5_3.3#/PCICLK_F
*FS3/PCICLK0
GNDPCI
*SEL24_48#/PCICLK1
*SELPCIE_6#/PCICLK2
PCICLK3
PCICLK4
VDDPCI
BUFFER IN
GNDPCI
PCICLK5
2-REF@3'3V,14'318MHz'
Features:
Up to 137MHz frequency support
97MHz to support high-end AMD processor'
PCICLK6/PCICLK_E
VDDCOR
SDRAM5
VDDSDR
SDRAM6
SDRAM7
VDD48
PCI_STOP#
*PD#
Support power management: CLK, PCI, stop and Power
down Mode from I2C programming'
GND48
SDATA
SCLK
48MHz/FS0*
24_48MHz/FS1*
Spread spectrum for EMI control
(±'25% & 0 to -0'5% down spread)'
Uses external 14'318MHz crystal
FS pins for frequency select
48-Pin SSOP and TSSOP
* Internal Pull-up Resistor of 120K to VDD
KeySpecifications:
CPU Output Jitter @ 2'5V: <300ps
CPU Output Jitter @ 3'3V: <250ps
PCI Output Jitter @ 3'3V: <250ps
CPUOutputSkew@2'5V:<175ps
CPUOutputSkew@3'3V:<175ps
PCIOutputSkew@3'3V:<500ps
PCI Early to PCI Skew @ 3'3V: typ = 3ns
Functionality
CPU
(MHz)
66.67
100.00
100.30
133.33
105.00
133.37
137.00
75.00
100.00
95.00
97.00
133.33
90.00
96.22
PCI
(MHz)
33.33
33.33
33.43
33.33
35.00
33.34
34.25
37.50
33.33
31.67
32.33
33.33
30.00
32.07
33.41
30.50
FS3
FS2
FS1
FS0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Block Diagram
PLL2
48MHz
24_48MHz
REF[1:0]
/ 2
X1
X2
XTAL
OSC
2
BUFFER IN
CPUCLK_F
PLL1
Spread
Spectrum
STOP
STOP
CPUCLK [2:0]
3
4
FS(0:3)
SDRAM [7:0]
SDRAM_F
LATCH
POR
8
SEL24_48#
4
PCI
CLK_STOP#
CLOCK
DIVDER
STOP
PCICLK [5:0]
PCICLK_F
PCICLK_E
6
PCI_STOP#
CPU2.5_3.3#
Control
Logic
66.82
91.50
SDATA
SCLK
PD#
Config.
Reg.
Pentium is a trademark of Intel Corporation
I2C is a trademark of Philips Corporation
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
9248-143 Rev C 7/26/00
information being relied upon by the customer is current and accurate.