LMK00338 - LMK00338 8-Output PCIe Gen1/2/3 Clock Buffer/Level Translator

The LMK00338 device is an 8-output PCIe Gen1/Gen2/Gen3 fanout buffer intended forhigh-frequency, low-jitter clock, data distribution, and level translation. The input clock can beselected from two universal inputs or one crystal input. The selected input clock is distributed totwo banks of 4 HCSL outputs and one LVCMOS output. The LVCMOS output has a synchronous enable inputfor runt-pulse-free operation when enabled or disabled. The LMK00338 operates from a 3.3-V coresupply and 3 independent 3.3-V or 2.5-V output supplies.

The LMK00338 provides high performance, versatility, and power efficiency, making itideal for replacing fixed-output buffer devices while increasing timing margin in thesystem.

• 3:1 Input Multiplexer
  • Two Universal Inputs Operate up to 400 MHz and Accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or Single-Ended Clocks
  • One Crystal Input Accepts a 10-MHz to 40-MHz Crystal or Single-Ended Clock
• Two Banks With 4 Differential Outputs Each
  • HCSL, or Hi-Z (Selectable per Bank)
  • Additive RMS Phase Jitter for PCIe Gen3 at 100 MHz:
    • 30 fs RMS (Typical)
• –72 dBc at 156.25 MHz
• LVCMOS Output With Synchronous Enable Input
• Pin-Controlled Configuration
• V_CC Core Supply: 3.3 V ± 5%
• 3 Independent V_CCO Output Supplies: 3.3 V/2.5 V ± 5%
• Industrial Temperature Range: –40°C to +85°C
• 40-lead WQFN (6 mm × 6 mm)

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