ICS9248-195 Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – Frequency Generator & Integrated Buffers for PENTIUM II/III & K6

Integrated
Circuit
Systems, Inc.
ICS9248 - 195
Frequency Generator & Integrated Buffers for PENTIUM II/III^TM & K6
Recommended Application:
Key Specifications:
440BX, MX, VIA PM/PL/PLE 133 style chip set, with
Coppermine or Tualatin processor, for note book
applications.
Output Features:
• 4 - CPUs @ 2.5V/3.3V
including 1 free running CPUCLK_F
• 9 - SDRAM @ 3.3V
• CPU Output Jitter @ 2.5V: <300ps
• CPU Output Jitter @ 3.3V: <250ps
• PCI Output Jitter @ 3.3V: <250ps
• CPU Output Skew @ 2.5V: <175ps
• CPU Output Skew @ 3.3V: <175ps
• PCI Output Skew @ 3.3V: <500ps
• PCI Early to PCI Skew @ 3.3V: typ = 3ns
• SDRAM Output Skew @ 3.3V: <500ps
• 7 - PCI @ 3.3V, including 1 free running PCICLK_F
• 1 - PCI Early @ 3.3V
Pin Configuration
• 1 - 48MHz, @ 3.3V fixed.
VDDREF
1
• 1 - 24/48MHz @ 3.3V
*SPREAD/REF0
2
• 2 - REF @3.3V, 14.318MHz.
GNDREF
3
X1
4
Features:
X2
5
VDDPCI
6
• Up to 137MHz frequency support
• 97MHz to support high-end AMD processor.
*CPU2.5_3.3#/PCICLK_F
7
*FS3/PCICLK0
8
GNDPCI
9
•
Support power management: CLK, PCI, stop and
Power down Mode from I²C programming.
*SEL24_48#/PCICLK1
*SELPCIE_6#/PCICLK2
PCICLK3
10
11
12
• Spread spectrum for EMI control
PCICLK4
13
VDDPCI
14
• Uses external 14.318MHz crystal
BUFFER IN
15
GNDPCI
16
• FS pins for frequency select
PCICLK5
17
PCICLK6/PCICLK_E
18
VDDCOR
19
PCI_STOP#
20
*Vtt_PWRGD/PD#
21
GND48
22
SDATA
23
SCLK
24
48
REF1/FS2*
47
VDDLCPU
46
CPUCLK_F
45
CPUCLK0
44
GNDLCPU
43
CPUCLK1
42
CPUCLK2
41
CLK_STOP#
40
GNDSDR
39
SDRAM_F
38
SDRAM0
37
SDRAM1
36
VDDSDR
35
SDRAM2
34
SDRAM3
33
GNDSDR
32
SDRAM4
31
SDRAM5
30
VDDSDR
29
SDRAM6
28
SDRAM7
27
VDD48
26
48MHz/FS0*
25
24_48MHz/FS1*
Block Diagram
48-Pin SSOP and TSSOP
* Internal Pull-up Resistor of 120K to VDD
0375D—02/02/04
Functionality
Bit2
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Bit6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Bit5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPUCLK
66.67
100.00
66.67
133.33
66.67
100.00
100.00
133.33
66.67
100.00
90.00
133.33
70.00
105.00
133.33
140.00
PCICLK
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
30.00
33.33
35.00
35.00
33.33
35.00