LMK00334 Clock Buffer/Level Translator


TI's 4-output PCIe Gen1/Gen2/Gen3 clock buffer/level translator

Texas Instruments' LMK00334 is a 4-output HCSL 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 two HCSL outputs and one LVCMOS output. The LVCMOS output has a synchronous enable input for runt-pulse-free operation when enabled or disabled. The LMK00334 operates from a 3.3 V core supply and three independent 3.3/2.5 V output supplies.

The LMK00334 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 to 40 MHz crystal or single-ended clock
  • Two banks with two differential outputs each:
    • HCSL, or Hi-Z (selectable)
    • Additive RMS phase jitter for PCIe Gen3 at 100 MHz: 30 fs RMS (typical)
 
  • High PSRR: –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: 3.3/2.5 V ±5%
  • Industrial temperature range: –40°C to +85°C
  • 32-lead WQFN (5 mm × 5 mm)

LMK00334 Clock Buffer/Level Translator

Manufacturer Part Number Description Available Quantity Datasheets
LMK00334RTVR IC CLK BUF 400MHZ 1CIRC 32WQFN 587
LMK00338RTAR IC CLK BUF 400MHZ 1CIRC 40WQFN 821