LMK00334RTVT

Overview

The LMK00334RTVT is a four-output clock buffer and level translator from Texas Instruments, designed for high-frequency, low-jitter clock distribution. It features a 3:1 input multiplexer selectable between two general-purpose inputs or one crystal input, supporting frequencies up to 400 MHz. The device provides two groups of HCSL outputs and one LVCMOS output with synchronous enable control. Powered by a 3.3V core supply and independent 3.3V/2.5V output supplies, it operates within an industrial temperature range of -40°C to +85°C in a 32-WQFN package.

Feature Summary

• 3:1 Input Multiplexer: Selects between two general-purpose inputs (LVPECL, LVDS, CML, SSTL, HSTL, HCSL, single-ended) or one crystal input (10MHz–40MHz).
• Output Configuration: Distributes the selected clock to two groups of differential HCSL outputs (2 per group) and one LVCMOS output with synchronous enable.
• Low Jitter Performance: Delivers typical RMS phase jitter of 30fs at 100MHz for PCIe Gen3 applications.
• High PSRR: Provides -72dBc power supply rejection ratio at 156.25MHz.

Applications

• Clock distribution and level translation for ADCs and DACs.
• Multi-gigabit Ethernet, XAUI, Fiber Channel, SATA/SAS, SONET/SDH, and CPRI systems.
• PCI Express (PCIe 3.0) backplane timing.
• Servers, computing platforms, switches, routers, and line interface cards.

Procurement Notes

Verify the specific suffix RTVT against the official datasheet to confirm the reel quantity and tape specifications. Ensure the component meets AEC-Q100 requirements if automotive qualification is necessary, as standard LMK00334 variants may differ from the Q1 graded versions. Confirm RoHS3 compliance status prior to integration.

Selection Notes

Select the LMK00334RTVT when a 3:1 input mux and mixed HCSL/LVCMOS outputs are required for frequencies up to 400MHz. Choose this over the LMK00338 if only four outputs are needed, as the LMK00338 provides eight outputs. Ensure the system supports the required 3.3V core and separate 3.3V/2.5V output voltage rails for proper operation.

Part Context

The LMK00334 is part of the LMK003xx family of clock buffers. It serves as a replacement for fixed-output buffers while adding timing margin. The RTVT suffix indicates a specific packaging variant, typically a tape-and-reel configuration for surface-mount assembly in a 32-WQFN (5mm x 5mm) package.

Replacement Considerations

The LMK00338 offers similar functionality but with eight outputs instead of four. For automotive applications, consider the LMK00334-Q1 variant which carries AEC-Q100 qualification. Verify pinout compatibility if substituting other generic clock buffers.