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ICS9248YF-64 Datasheet

  • ICS9248YF-64

  • AMD-K7TM System Clock Chip

  • 143.16KB

  • 15頁(yè)

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9248-64
AMD-K7
TM
System Clock Chip
General Description
The
ICS9248-64
is a main clock synthesizer chip for AMD-
K7 based systems. This provides all clocks required for such
a system when used with a Zero Delay Buffer Chip such as
the ICS9179-06.
Spread Spectrum may be enabled by driving the SPREAD#
pin active. Spread spectrum typically reduces system EMI by
8dB to 10dB. This simplifies EMI qualification without
resorting to board design iterations or costly shielding. The
ICS9248-64
employs a proprietary closed loop design, which
tightly controls the percentage of spreading over process and
temperature variations.
Features
鈥?/div>
Generates the following system clocks:
- 3 differential pair open drain CPU clocks
(1.5V external
pull-up; up to 133MHz).
- 8 PCI including 1 free running (3.3V) @33.3MHz.
- 2 AGP(3.3V) up to 66.6MHz.
- 2 REF(3.3V)@14.318MHz
- 1 48MHz(3.3V)
- 24 / 48MHz(3.3V)
Skew characteristics:
- CPU -CPU<250ps
- CPUt - CPUc <200ps (differential pair)
- PCI 鈥?PCI: <500ps
- CPU 鈥?SDRAM_OUT: < 250ps
- CPU 鈥?AGP <500ps
Efficient Power Management through PD#, PCI_STOP#
and CPU_STOP#.
Spread Spectrum option for EMI reduction
(-1.0% down spread).
Uses external 14.318 MHz crystal
鈥?/div>
鈥?/div>
鈥?/div>
Block Diagram
鈥?/div>
Pin Configuration
*FS0/REF0
*FS1/REF1
GNDREF
X1
X2
GNDPCI
PCICLK_F
PCICLK0
VDDPCI
PCICLK1
PCICLK2
GNDPCI
PCICLK3
PCICLK4
VDDPCI
PCICLK5
PCICLK6
VDDAGP
AGP0
AGP1
GNDAGP
VDD48
48MHz
SEL24_48#/24-48MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
GNDSD
SDRAM_OUT
VDDSD
RESERVED
CPUCLKC2
CPUCLKT2
GNDCPU
CUCLKC1
CPUCLKT1
GND
CPUCLKC0
CPUCLKT0
RESERVED
VDD
GND
PCI_STOP#
CPU_STOP#
PD#
SPREAD#
TEST#
SDATA
2
I C
SCLK
GND48
ICS9248-64
{
48-Pin SSOP
* Internal 120K pullup resistor on indicated inputs
AMD-K is a trademark of Advanced Micro Devices.
9248-64 Rev C 03/19/01
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.

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