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ICS9250-13

Features: · 3.3V outputs: SDRAM, PCI, REF, 48/24MHz· 2.5V or 3.3V outputs: CPU· 20 ohm CPU clock output impedance· 20 ohm PCI clock output impedance· Skew from CPU (earlier) to PCI clock - 1 to 4 ns, center 2.6 ns.· No external load cap for CL=18pF crystals· ±250 ps CPU, PCI clock skew· 400ps (cyc...

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SeekIC No. : 004371265 Detail

ICS9250-13: Features: · 3.3V outputs: SDRAM, PCI, REF, 48/24MHz· 2.5V or 3.3V outputs: CPU· 20 ohm CPU clock output impedance· 20 ohm PCI clock output impedance· Skew from CPU (earlier) to PCI clock - 1 to 4 ns...

ICS9250-13 Data Sheet

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Part Number:
ICS9250-13
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:

· 3.3V outputs: SDRAM, PCI, REF, 48/24MHz
· 2.5V or 3.3V outputs: CPU
· 20 ohm CPU clock output impedance
· 20 ohm PCI clock output impedance
· Skew from CPU (earlier) to PCI clock - 1 to 4 ns, center 2.6 ns.
· No external load cap for CL=18pF crystals
· ±250 ps CPU, PCI clock skew
· 400ps (cycle to cycle) CPU jitter
· Smooth frequency switch, with selections from 50 to 83.3 MHz CPU.
· I2C interface for programming
· 2ms power up clock stable time
· Clock duty cycle 45-55%.
· 56 pin 300 mil SSOP package
· 3.3V operation, 5V tolerant input.


Application

·440LX/EX type chipset Motherboard single chip clock solution.


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 ICS9250-13 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro or Cyrix. Eight different reference frequency multiplying factors are externally selectable with smooth frequency transitions.

Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9250-13  employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.




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