LMK00338 (ACTIVE)

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

 

Recommended alternative parts

  • LMK00308  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Low additive jitter ,1:8 Universal differential buffer that can support HCSL

Description

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

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

Features

  • 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
  • VCC Core Supply: 3.3 V ± 5%
  • 3 Independent VCCO 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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Parametrics Compare all products in Differential

 
Additive RMS Jitter (Typ) (fs)
Output Frequency (Max) (MHz)
Input Level
Number of Outputs
Output Level
VCC (V)
VCC Out (V)
Input Frequency (Max) (MHz)
Operating Temperature Range (C)
Rating
LMK00338 LMK00334
30    30   
400    400   
CML
HCSL
HSTL
LVCMOS
LVDS
LVPECL
LVTTL
SSTL
XTAL   
CML
HCSL
HSTL
LVCMOS
LVDS
LVPECL
SSTL
XTAL   
8    4   
HCSL
LVCMOS   
HCSL
LVCMOS   
3.3    3.3   
2.5
3.3   
2.5
3.3   
400    400   
-40 to 85    -40 to 85   
Catalog    Catalog   

Featured tools and software

WEBENCH® Designer LMK00338

Frequency Number of Outputs
 MHz
Output Format