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CY2256

Features: • Multiple clock outputs to meet all requirements of Pentium™ or Cyrix 6x86-based motherboards using the OPTi Viper™ chipset-Five CPU clocks (CPUCLK) @ 75 MHz, 66.66 MHz, 60.0 MHz or 50.0 MHz, pin selectable-Seven PCI clocks (PCICLK) @ 25.0 MHz, 30.0 MHz or 33.3 MHz, pi...

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SeekIC No. : 004319120 Detail

CY2256: Features: • Multiple clock outputs to meet all requirements of Pentium™ or Cyrix 6x86-based motherboards using the OPTi Viper™ chipset-Five CPU clocks (CPUCLK) @ 75 MHz, 66.66 MHz,...

CY2256 Data Sheet

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Part Number:
CY2256
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:

• Multiple clock outputs to meet all requirements of Pentium
™ or Cyrix 6x86-based motherboards using the OPTi Viper™ chipset
-Five CPU clocks (CPUCLK) @ 75 MHz, 66.66 MHz, 60.0 MHz or 50.0 MHz, pin selectable
-Seven PCI clocks (PCICLK) @ 25.0 MHz, 30.0 MHz or 33.3 MHz, pin selectable
-Two Ref. clocks @ 14.318 MHz
-Ref. 14.318 MHz Xtal oscillator input
• Low CPU and PCI clock jitter < 250 ps cycle-to-cycle in synchronous PCI mode
• Low skew outputs
-< 200 ps between CPU clocks
-< 200 ps between PCI clocks
-< 500 ps max. skew between CPU and PCI Clocks (in synchronous mode)
• Output duty cycle 45% min. to 55% max.
• Available in space-saving 28-pin SOIC and SSOP packages
• 3.3V or 5.0V operation
• Internal pull-up resistors on select input
• Bank selectable CPU clock for synchronous DRAM support


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
Package Power Dissipation............................................ 1W
Static Discharge Voltage ........................................ >2000V
(per MIL-STD-883, Method 3015)


Description

The CY2256 is a Clock Synthesizer/Driver chip for a Pentium or Cyrix 6x86-based PC using the OPTi Viper chipset. The CY2256 has low-skew outputs (< 200 ps between the CPU Clocks, < 200 ps between the PCI Clocks). In addition, the CY2256 CPU clock outputs have less than 250 ps cycle-to-cycle jitter. Finally, both the PCI and CPU clock outputs meet the 1V/ns slew rate requirement of the Pentium processor-based system.

The CY2256 accepts a 14.318 MHz reference crystal or clock as its input. The CY2256 has two PLLs, one of which generates the CPU clocks, and the other generates the PCI clocks.

The CY2256 runs off a 3.3V or 5.0V supply.




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