CY2285

Features: • Mixed 2.5V and 3.3V operation• Complete clock solution for Pentium® II, and other similar processor-based motherboards-Two CPU clocks at 2.5V up to 100 MHz-Six synchronous PCI clocks, one free-running-Two 3.3V Reference clocks at 14.318 MHz-One 3.3V USB clock running at...

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CY2285 Picture
SeekIC No. : 004319136 Detail

CY2285: Features: • Mixed 2.5V and 3.3V operation• Complete clock solution for Pentium® II, and other similar processor-based motherboards-Two CPU clocks at 2.5V up to 100 MHz-Six synchronou...

floor Price/Ceiling Price

Part Number:
CY2285
Supply Ability:
5000

Price Break

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

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Upload time: 2024/12/21

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Product Details

Description



Features:

• Mixed 2.5V and 3.3V operation
• Complete clock solution for Pentium® II, and other similar processor-based motherboards
-Two CPU clocks at 2.5V up to 100 MHz
-Six synchronous PCI clocks, one free-running
-Two 3.3V Reference clocks at 14.318 MHz
-One 3.3V USB clock running at 48 MHz
-One 3.3V USB/IO clock running at 48 MHz/24 MHz
• Spread Spectrum clocking for EMI control
• 1.54.0 ns delay between CPU and PCI clocks
• Power-down, CPU stop and PCI stop pins
• Low skew outputs, 175 ps between CPU clocks
• Early PCI clock leads PCI by 14 ns (-2 option)
• DIV4 allows dynamic shifting of CPU and PCI clocks from the default frequency to default/4 (-2 option)
• Factory-EPROM programmable output drive and slew rate for EMI customization
• Available in space-saving 28-pin SSOP package



Pinout

  Connection Diagram


Specifications

(Above which the useful life may be impaired. For user guidelines,
not tested.)
Supply Voltage ................................................0.5 to +7.0V
Input Voltage ........................................... 0.5V to VDD+0.5
Storage Temperature (Non-Condensing) ... 65 to +150
Max. Soldering Temperature (10 sec) ....................... +260
Junction Temperature ............................................... +150
Static Discharge Voltage ...........................................>2000V
(per MIL-STD-883, Method 3015, like VDD pins tied together)



Description

The CY2285 is a clock synthesizer/driver for Pentium II, or other similar processor-based mobile PCs requiring up to 100-MHz support. The CY2285 outputs two CPU clocks at 2.5V. There are six PCI clocks, running at one-half or one-third the CPU clock frequency of 66.6 MHz and 100 MHz respectively.

One of the PCI clocks is free-running. Additionally, the part outputs two 3.3V reference clocks at 14.318 MHz.

The CY2285 provides incorporates the Intel®-defined spread spectrum features. It provides a 0.6% downspread on the CPU and PCI clocks, which can help reduce EMI in certain high-speed systems.

The CY2285 possesses power-down, CPU stop, and PCI stop pins for power management control. The signals are synchronized on-chip, and ensure glitch-free transitions on the outputs.

When the CPU_STOP input is asserted, the CPU clock outputs are driven LOW. When the PCI_STOP input is asserted, the PCI clock outputs (except the free-running PCI clock) are driven LOW. When the PWR_DWN pin is asserted, the reference oscillator and PLLs are shut down, and all outputs are driven LOW.

The CY2285-2 features an early PCI clock which leads the other PCI clocks by 14 ns. The CY2285-2 also features a DIV4 pin which allows for dynamic shifting of CPU and PCI clocks from the default frequency to the default/4.




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