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LMK00338

ACTIVE

8-output PCIe® Gen1/Gen2/Gen3/Gen4/Gen5 clock buffer and level translator

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Data sheet

LMK00338

ACTIVE
Data sheet Order now

Product details

Function Differential, Fanout, Level translator Additive RMS jitter (typ) (fs) 30 Output frequency (max) (MHz) 400 Number of outputs 8 Output supply voltage (V) 2.5, 3.3 Core supply voltage (V) 3.3 Output skew (ps) 50 Features PCIe Gen 5 Compliant Operating temperature range (°C) -40 to 85 Rating Catalog Output type HCSL, LVCMOS Input type CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, LVTTL, SSTL, XTAL
Function Differential, Fanout, Level translator Additive RMS jitter (typ) (fs) 30 Output frequency (max) (MHz) 400 Number of outputs 8 Output supply voltage (V) 2.5, 3.3 Core supply voltage (V) 3.3 Output skew (ps) 50 Features PCIe Gen 5 Compliant Operating temperature range (°C) -40 to 85 Rating Catalog Output type HCSL, LVCMOS Input type CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, LVTTL, SSTL, XTAL
WQFN (RTA) 40 36 mm² 6 x 6
  • 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 Gen5 at 100 MHz:
      • 15 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)
  • 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 Gen5 at 100 MHz:
      • 15 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)

The LMK00338 device is an 8-output PCIe Gen1/Gen2/Gen3/Gen4/Gen5 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.

The LMK00338 device is an 8-output PCIe Gen1/Gen2/Gen3/Gen4/Gen5 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.
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Technical documentation

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Type Title Date
* Data sheet LMK00338 8-Output PCIe Gen1/Gen2/Gen3/Gen4/Gen5 Clock Buffer and Level Translator datasheet (Rev. C) PDF | HTML 12 Jul 2021
Application note Clocking for PCIe Applications PDF | HTML 28 Nov 2023
EVM User's guide LMK00338EVM User's Guide 13 Dec 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMK00338EVM — LMK00338 PCIe Gen1/2/3 Clock Buffer Evaluation Module

The LMK00338 is a 400MHz, 8-output HCSL buffer intended for PCIe Gen1/2/3 Applications, low additive jitter clock distribution and level translation. The EVM allows the user to verify the functionality and performance specification of the device. Refer to the LMK00338 datasheet for the functional (...)

User guide: PDF
Not available on TI.com
Simulation model

LMK00338 IBIS Model

SNAM161.ZIP (107 KB) - IBIS Model
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Design tool

CLOCK-TREE-ARCHITECT — Clock tree architect programming software

Clock tree architect is a clock tree synthesis tool that streamlines your design process by generating clock tree solutions based on your system requirements. The tool pulls data from an extensive database of clocking products to generate a system-level multi-chip clocking solution.
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PLLATINUMSIM-SW — PLLatinum Sim Tool

PLLATINUMSIM-SW is a simulation tool that allows users to create detailed designs and simulations of our PLLatinum™ integrated circuits, which include the LMX series of phase-locked loops (PLLs) and synthesizers.

Supported products & hardware

Supported products & hardware

Products
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Clock buffers
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Clock generators
LMK03318 — Ultra-low jitter clock generator family with single PLL LMK03328 — Ultra-low jitter clock generator family with two independent PLLs LMK03806 — Ultra-low jitter clock generator with 14 outputs
IQ demodulators
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Clock jitter cleaners
LMK04208 — Ultra low-noise clock jitter cleaner with 6 programmable outputs LMK04368-EP — Enhanced product ultra-low-noise 3.2-GHz JESD204C jitter cleaner LMK04714-Q1 — Automotive, ultra low-noise 3.2-GHz, JESD204B and JESD204C dual-loop clock jitter cleaner LMK04803 — Low-noise clock jitter cleaner with dual cascaded PLLs and integrated 1.9-GHz VCO LMK04805 — Low-noise clock jitter cleaner with dual cascaded PLLs and integrated 2.2-GHz VCO LMK04806 — Low-noise clock jitter cleaner with dual cascaded PLLs and integrated 2.5-GHz VCO LMK04808 — Low-noise clock jitter cleaner with dual loop PLLs and integrated 2.9-GHz VCO LMK04816 — Three input low-noise clock jitter cleaner with dual loop PLLs LMK04821 — Ultra low jitter synthesizer and jitter cleaner with JESD204B support LMK04826 — Ultra low-noise JESD204B compliant clock jitter cleaner with integrated 1840 to1970-MHz VCO0 LMK04828 — Ultra low-noise JESD204B compliant clock jitter cleaner with integrated 2370 to 2630-MHz VCO0. LMK04828-EP — Ultra low-noise JESD204B compliant clock jitter cleaner with temperature range -55 to 105c LMK04832 — Ultra-low-noise, 3.2-GHz, 15-output, JESD204B clock jitter cleaner with dual loop LMK04832-SEP — Radiation-tolerant, 30-krad, ultra-low-noise, 3.2-GHz 15-output JESD204C clock jitter cleaner LMK04832-SP — Radiation-hardened-assured (RHA), ultra-low-noise, 3.2-GHz, 15-output clock jitter cleaner LMK04906 — Ultra low noise clock jitter cleaner/multiplier with 6 programmable outputs
Clock network synchronizers
LMK05028 — Low-jitter dual-channel network synchronizer clock LMK05318 — Ultra-low jitter single channel network synchronizer clock with BAW LMK05318B — Ultra-low jitter single channel network synchronizer clock with BAW LMK05318B-Q1 — Automotive ultra-low jitter network synchronizer and clock generator LMK5B33216 — 16-output, three DPLL and APLL, network synchronizer with integrated 2.5-GHz bulk-acoustic-wave VCO LMK5B33414 — 14-output, three DPLL and APLL, network synchronizer with integrated 2.5-GHz bulk-acoustic-wave VCO LMK5C33216 — Ultra-low jitter clock synchronizer with JESD204B for wireless communications with BAW LMK5C33216A — Three DPLL, three APLL, two-input and 16-output network synchronizer with JESD204B/C and BAW VCO
Hardware development
Evaluation board
LMK04832EVM — LMK04832 JESD204B Clock Jitter Cleaner/Clock Generator/Distribution Evaluation Module LMX2571EPEVM — LMX2571-EP evaluation module for 1.34-GHz, low-power, extreme-temperature RF synthesizer LMX2594PSEVM — LMX2594 evaluation module for 15-GHz RF synthesizer with multiple-device phase synchronization XMICR-3P-LMX2492 — LMX2492 X-MWblock evaluation modules XMICR-3P-LMX2572 — LMX2572 X-MWblock evaluation modules XMICR-3P-LMX2592 — LMX2592 X-MWblock evaluation modules XMICR-3P-LMX2594 — LMX2594 X-MWblock evaluation modules XMICR-3P-LMX2595 — LMX2595 X-MWblock evaluation modules
Software
Application software & framework
TICSPRO-SW — Texas Instruments Clocks and Synthesizers (TICS) Pro Software
IDE, configuration, compiler or debugger
CODELOADER — CodeLoader Software for device register programming
Support software
LMX9830-SW — LMX9830 Application Notes, Software, and Tools LMX9838-SW — LMX9838 Application Notes, Software, and Tools
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