Overview

The 87004 is a highly versatile 1:4 Differential-to-LVCMOS/LVTTL Clock Generator and a member of the HiPerClockS® family of High Performance Clock Solutions from IDT. The 87004 has two selectable clock inputs. The CLK0, nCLK0 and CLK1, nCLK1 pairs can accept most standard differential input levels. Internal bias on the nCLK0 and nCLK1 inputs allows the CLK0 and CLK1 inputs to accept LVCMOS/LVTTL. The 87004 has a fully integrated PLL and can be configured as zero delay buffer, multiplier or divider and has an input and output frequency range of 15.625MHz to 250MHz. The reference divider, feedback divider and output divider are each programmable, thereby allowing for the following output-to-input frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8. The external feedback allows the device to achieve "zero delay" between the input clock and the output clocks. The PLL_SEL pin can be used to bypass the PLL for system test and debug purposes. In bypass mode, the reference clock is routed around the PLL and into the internal output dividers.

87004 - Block Diagram
87004 - Pinout
87004 - Block Diagram
87004 - Pinout
  • Four LVCMOS/LVTTL outputs, 7? typical output impedance
  • Selectable CLK0/nCLK0 or CLK1/nCLK1 clock inputs
  • CLKx/nCLKx pairs can accept the following differential input levels: LVPECL, LVDS, LVHSTL, HCSL, SSTL
  • Internal bias on nCLK0 and nCLK1 to support LVCMOS/LVTTL levels on CLK0 and CLK1 inputs
  • Output frequency range: 15.625MHz to 250MHz
  • Input frequency range: 15.625MHz to 250MHz
  • VCO range: 250MHz to 500MHz
  • External feedback for "zero delay" clock regeneration with configurable frequencies
  • Programmable dividers allow for the following output-to-input frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8
  • Fully integrated PLL
  • Cycle-to-cycle jitter: 45ps (maximum)
  • Output skew: 50ps (maximum)
  • Static phase offset: 50ps ± 125ps (3.3V ± 5%), CLK0/nCLK0
  • Full 3.3V or 2.5V output operating supply
  • 5V tolerant inputs
  • 0°C to 70°C ambient operating temperature
  • Available in both standard (RoHS 5) and lead-free (RoHS 6) packages

Documentation

Design & Development

ECAD Models

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Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    87004AGLF
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Tube
    87004AGLFT
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Reel
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