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ICS9248-66

Features: · Generates the following system clocks: - 3 CPU clocks ( 2.5V, 100/133MHz) - 8 PCI clocks, including 1 free-running (3.3V, 33MHz) - 1 CPU/2 clocks (2.5V, 50/66MHz) - 1 IOAPIC clocks (2.5V, 16.67MHz) - 3 Fixed frequency 66MHz clocks(3.3V, 66MHz) - 2 REF clocks(3.3V, 14.318MHz) - 1 USB cl...

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SeekIC No. : 004371254 Detail

ICS9248-66: Features: · Generates the following system clocks: - 3 CPU clocks ( 2.5V, 100/133MHz) - 8 PCI clocks, including 1 free-running (3.3V, 33MHz) - 1 CPU/2 clocks (2.5V, 50/66MHz) - 1 IOAPIC clocks (2.5V...

ICS9248-66 Data Sheet

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Part Number:
ICS9248-66
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:
   - 3 CPU clocks ( 2.5V, 100/133MHz)
   - 8 PCI clocks, including 1 free-running (3.3V, 33MHz)
   - 1 CPU/2 clocks (2.5V, 50/66MHz)
   - 1 IOAPIC clocks (2.5V, 16.67MHz)
   - 3 Fixed frequency 66MHz clocks(3.3V, 66MHz)
   - 2 REF clocks(3.3V, 14.318MHz)
   - 1 USB clock (3.3V, 48MHz)
· Efficient power management through PD#, CPU_STOP# and PCI_STOP#.
· 0 to -0.5% typical down spread modulation on CPU, PCI, IOAPIC, 3V66 and CPU/2 output clocks.
· Uses external 14.318MHz crystal.


Pinout

Connection Diagram


Specifications

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . 7.0 V
Logic Inputs . . . . . . . . . . .GND - 0.5 V to VDD +0.5 V
Ambient Operating Temperature . . . . 0°C to +70°C
Storage Temperature . . . . . . . . . - 65°C to +150°C

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.


Description

The ICS9248-66 is a main clock synthesizer chip for Pentium II based systems using Rambus Interface DRAMs. This chip provides all the clocks required for such a system when used with a Direct Rambus Clock Generator(DRCG) chip such as the ICS9211-01.

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 ICS9248-66 employs a proprietary closed loop design, which  tightly controls the percentage of spreading over process and temperature variations.




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