LMK00338RTAR

Overview

The LMK00338RTAR is a clock buffer and level translator manufactured by Texas Instruments, designed for high-frequency clock distribution. It features eight outputs capable of reaching a maximum frequency of 400 MHz. The device accepts diverse input signals including CML, HCSL, LVDS, and crystal inputs, converting them to HCSL or LVCMOS output levels. Operating on a single 3.15 V to 3.45 V supply, it exhibits a maximum propagation delay of 2.3 ns and draws 13.5 mA of operating current. Packaged in a 40-WQFN (6x6 mm) format, it supports an industrial temperature range from -40°C to +85°C.

Feature Summary

• Supports multiple input formats: CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL, and XTAL
• Provides 8 outputs with configurable HCSL and LVCMOS logic levels
• Maximum operating frequency of 400 MHz with 2.3 ns max propagation delay
• Single 3.3V core power supply with independent output supplies

Applications

• PCI Express (PCIe) clock buffering
• SATA interface timing
• CPU clock distribution

Procurement Notes

Verify the suffix RTAR indicates reel packaging when sourcing. Confirm RoHS compliance status via the manufacturer datasheet as indicated in distributor listings. Check moisture sensitivity level (MSL 3) requirements for storage and handling prior to soldering. Ensure the 40-WQFN footprint matches the PCB layout specifications.

Selection Notes

Select this component when a single-input, multi-output buffer is required for PCIe or SATA systems. It is suitable for applications needing conversion from differential or single-ended inputs to HCSL/LVCMOS. Compare against the LMK00334 if only four HCSL outputs are sufficient. Verify that the 400 MHz frequency limit meets the system clock requirements.

Part Context

The LMK00338 belongs to the LMK0033x family of clock buffers and level translators. It shares architectural similarities with the LMK00334 but offers increased output count. This series is positioned to replace fixed-output buffers while providing system timing margin through flexible level translation capabilities.

Replacement Considerations

The LMK00334 is a related part within the same family offering 4 HCSL outputs instead of 8. No direct pin-to-pin substitutes are confirmed in the provided documentation.