LMK00304 3.1-GHz Differential Clock Buffer/Level Translator | TI.com

LMK00304 (ACTIVE) 3.1-GHz Differential Clock Buffer/Level Translator



The LMK00304 is a 3-GHz 4-output differential 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 2 differential outputs and one LVCMOS output. The differential output banks can be mutually configured as LVPECL, LVDS, or HCSL drivers, or disabled. The LVCMOS output has a synchronous enable input for runt-pulse-free operation when enabled or disabled. The LMK00304 operates from a 3.3 V core supply and 3 independent 3.3 V/2.5 V output supplies.

The LMK00304 provides high performance, versatility, and power efficiency, making it ideal for replacing fixed-output buffer devices while increasing timing margin in the system.


  • 3:1 Input Multiplexer
    • Two Universal Inputs Operate up to 3.1 GHz 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 2 Differential Outputs Each
    • LVPECL, LVDS, HCSL, or Hi-Z (Selectable)
    • LVPECL Additive Jitter with LMK03806 Clock Source at 156.25 MHz:
      • 20 fs RMS (10 kHz to 1 MHz)
      • 51 fs RMS (12 kHz to 20 MHz)
  • High PSRR: –65 / –76 dBc (LVPECL/LVDS) 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
  • 32-lead WQFN (5 mm × 5 mm)

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Design with LMK00304

Frequency Number of Outputs
Output Format


Compare all products in Universal (programmable) Email Download to Excel
Part number Order Additive RMS jitter (Typ) (fs) Output frequency (Max) (MHz) Number of outputs VCC core (V) VCC out (V) Operating temperature range (C)
LMK00304 Order now 51     3100     5     3.3     3.3
-40 to 85    
LMK00301 Order now 51     3100     11       3.3
-40 to 85    
LMK00306 Order now 51     3100     7       2.5
-40 to 85    
LMK00308 Order now 51     3100     9       2.5
-40 to 85