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MK1442

Features: • Provides exact frequency Ethernet and SCSI clocks• 5V or 3.3V (up to 80MHz) operation• Output clock frequencies up to 100 MHz• Pentium™ Processor compatible timing• 486 compatible smooth frequency transitions• Seven or eight output clocks•...

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SeekIC No. : 004421650 Detail

MK1442: Features: • Provides exact frequency Ethernet and SCSI clocks• 5V or 3.3V (up to 80MHz) operation• Output clock frequencies up to 100 MHz• Pentium™ Processor compatible...

MK1442 Data Sheet

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Part Number:
MK1442
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: 2024/11/26

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Product Details

Description



Features:

• Provides exact frequency Ethernet and SCSI clocks
• 5V or 3.3V (up to 80MHz) operation
• Output clock frequencies up to 100 MHz
• Pentium™ Processor compatible timing
• 486 compatible smooth frequency transitions
• Seven or eight output clocks
• Compatible with X86 and 680X0 CPUs
• Skew controlled 2X and 1X CPU to within 250ps
• Packaged in 16 pin skinny SOIC or PDIP
• Duty cycle of 47.5/52.5 up to 66.66 MHz
• Duty cycle of 45/55 up to 100 MHz
• Total of 15 different selectable CPU frequencies
• Tri-state outputs for board level testing
• 25mA drive capability at TTL levels
• Keyboard frequencies of 12MHz (-01), 8MHz (-02), or 16MHz (-03)
• Advanced, low power CMOS process
• MK1442 - output enable
• MK1443 - two 14.318 MHz outputs


Pinout

Connection Diagram


Specifications

Parameter
Conditions
Minimum
Typical
Maximum
Units
Supply Voltage, VDD Referenced to GND
7
V
Clock Outputs Referenced to GND
-0.5
VDD+.5V
V
Ambient Operating Temperature  
0
70
Soldering Temperature Max of 20 seconds
260
Storage temperature  
-65
150



Description

The MK1442/3 are the ideal way to generate clocks for desktop computer motherboards and LAN workstations. Using analog Phase-Locked Loop (PLL) techniques, the devices accept a 14.318 MHz crystal input to produce multiple output clocks up to 100 MHz. They provide 2XCPU, CPU, floppy controller, keyboard, system, SCSI and Ethernet clocks. The MK1442/3 are perfect for new Pentium™ Processor, PCI bus and 486 systems. The devices can operate at 5V or 3.3V up to and including 80MHz on the CPU clock.

MK1442 are identical except the MK1442 has an Output Enable (OE) pin that tri-states all outputs when taken low, and the MK1443 has an extra 14.318 MHz clock.




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