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ICS9248-78

Features: *Generates the following system clocks: - 2 - CPUs @ 2.5V, up to 150MHz. - 1 - IOAPIC @ 2.5V, PCI/2MHz. - 9 SDRAMs (3.3V), up to150MHz. -2 - 3V66 @ 3.3V, 2x PCIMHz. - 8 - PCIs @ 3.3V. - 1 - 48MHz, @ 3.3V fixed. - 2 - REF @ 3.3V, 14.318Hz. - 1 - 24MHz, @ 3.3V fixed.*Supports spread spectr...

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SeekIC No. : 004371256 Detail

ICS9248-78: Features: *Generates the following system clocks: - 2 - CPUs @ 2.5V, up to 150MHz. - 1 - IOAPIC @ 2.5V, PCI/2MHz. - 9 SDRAMs (3.3V), up to150MHz. -2 - 3V66 @ 3.3V, 2x PCIMHz. - 8 - PCIs @ 3.3V. - 1 ...

ICS9248-78 Data Sheet

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Part Number:
ICS9248-78
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

* Generates the following system clocks:
   - 2 - CPUs @ 2.5V, up to 150MHz.
   - 1 - IOAPIC @ 2.5V, PCI/2MHz.
   - 9 SDRAMs (3.3V), up to150MHz.
   -2 - 3V66 @ 3.3V, 2x PCIMHz.
   - 8 - PCIs @ 3.3V.
   - 1 - 48MHz, @ 3.3V fixed.
   - 2 - REF @ 3.3V, 14.318Hz.
   - 1 - 24MHz, @ 3.3V fixed.
* Supports spread spectrum modulation ,
   down spread 0 to -0.5%, ±0.25% center spread.
* I2C support for power management.
* Efficient power management scheme through PD#.
* Uses external 14.138 MHz crystal.


Pinout

Connection Diagram


Specifications

Core Supply Voltage . . . . . . . . . . . . . . . . . ................................ . . . . 4.6 V
I/O Supply Voltage . . . . . . . . . . . . . . . . . . ................................. . . . . 3.6V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.5 V to VDD +0.5 V
Ambient Operating Temperature . . . . . . . . ..................... . . . 0 to +70
Storage Temperature . . . . . . . . . . . . . . . ................ .. . . . -65 to +150
Case Temperature . . . . . . . . . . . . . . . . . ............................... ... . . . 115


Description

The ICS9248-78 is a single chip clock for Intel Pentium II. It provides all necessary clock signals for such a system.

Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces EMI by 8dB to 10 dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-78 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.




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