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ICS9250YF-23 Datasheet

  • ICS9250YF-23

  • Frequency Generator & Integrated Buffers for Celeron & PII/I...

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  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9250-23
Frequency Generator & Integrated Buffers for Celeron & PII/III鈩?/div>
Recommended Application:
810/810E type chipset
Output Features:
鈥?/div>
2 - CPUs @ 2.5V, up to 166MHz.
鈥?/div>
13 - SDRAM @ 3.3V, up to 166MHz.
鈥?/div>
2 - 3V66 @ 3.3V, 2x PCI MHz.
鈥?/div>
8 - PCI @3.3V.
鈥?/div>
1 - 48MHz, @3.3V fixed.
鈥?/div>
1 - 24MHz @ 3.3V
鈥?/div>
2 - REF @3.3V, 14.318MHz.
Features:
鈥?/div>
Up to 166MHz frequency support
鈥?/div>
Support power management through PD#.
鈥?/div>
Spread spectrum for EMI control (鹵 0.25%)
center spread.
鈥?/div>
Uses external 14.318MHz crystal
鈥?/div>
FS pins for frequency select
Key Specifications:
鈥?/div>
CPU Output Jitter: <250ps
鈥?/div>
IOAPIC Output Jitter: <500ps
鈥?/div>
48MHz, 3V66, PCI Output Jitter: <500ps
鈥?/div>
Ref Output Jitter. <1000ps
鈥?/div>
CPU Output Skew: <175ps
鈥?/div>
PCI Output Skew: <500ps
鈥?/div>
3V66 Output Skew <175ps
鈥?/div>
For group skew timing, please refer to the
Group Timing Relationship Table.
Pin Configuration
56-Pin 300 mil SSOP
1. These pins will have 2X drive strength.
* 120K ohm pull-up to VDD on indicated inputs.
Block Diagram
Power Groups
GNDREF, VDDREF = REF, Crystal
GND3V66, VDD3V66 = 3V66
GNDPCI, VDDPCI = PCICLKs
GNDCOR, VDDCOR = PLLCORE
GND48, VDD48 = 48
GNDSDR, VDDSDR = SDRAM
GNDLCPU, VDDLCPU = CPUCLK
GNDLPCI, VDDLAPIC = IOAPIC
9250-23 Rev A 4/3/01
Third party brands and names are the property of their respective owners.
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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