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Texas Instruments LMK1D2104RHDR — Clock & Timing ICs

TI LMK1D2104RHDR Clock Buffer, 1:4 Fanout, 2 GHz, 28-VQFN

MPNLMK1D2104RHDR
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Texas Instruments LMK1D2104RHDR, Clock Buffer, 1:4 fanout, 2 GHz max, LVDS output, 28-VQFN (5x5), -40°C to 105°C, triple supply range (1.8V/2.5V/3.3V).

$10.2900Ref. price · indicative, final on quote
Texas Instruments LMK1D2104RHDR datasheet (PDF)
Packaging28-VFQFN Exposed Pad
RoHSNot applicable
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LMK1D2104RHDR specifications
ParameterValue
TypeClock Buffer
MountingSurface Mount, Wettable Flank
Supply voltage1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V
Frequency - max2 GHz
Operating temperature-40°C ~ 105°C (TA)
InputCML, HCSL, LVCMOS, LVDS, LVPECL
OutputLVDS
PackageTape & Reel (TR) Cut Tape (CT)
Case28-VFQFN Exposed Pad
Number of circuits2
Ratio - Input:Output1:4
Differential - Input:OutputYes/Yes

Product details

2 GHz fanout buffer with multi-protocol input flexibility

Each of the two independent fanout circuits distributes one input to four matched outputs, making it a compact building block for high-speed clock trees in networking, telecom, and data-center equipment where signal integrity and low additive jitter matter.

That makes it a straightforward choice for production BOMs where long-term availability is a requirement. For dual-sourcing or a pin-compatible alternative, the CDCLVP1204RGTR is a functional peer but uses LVPECL outputs and a single 1:2 fanout topology — the output logic family and fanout ratio differ, so a straight swap requires board-level changes.

Package and footprint notes for layout

The wettable-flank terminals aid optical inspection and solder-joint reliability. Supply decoupling should follow the recommended layout in the datasheet — one 0.1 µF cap per supply pin pair, placed as close as possible to the VQFN edge.

Frequently asked questions

What is the maximum frequency of LMK1D2104RHDR?

The LMK1D2104RHDR supports a maximum input/output frequency of 2 GHz, making it suitable for buffering high-speed serial links such as PCIe, 10GbE, and Fibre Channel reference clocks.

Is LMK1D2104RHDR a replacement for LMK1D2108?

The LMK1D2104RHDR is a different device from the LMK1D2108. The LMK1D2104RHDR provides two independent 1:4 fanout buffers, while the LMK1D2108 is a single 1:8 fanout buffer. They are not pin-compatible replacements; verify the fanout ratio and pinout before substituting.

What input signal types does LMK1D2104RHDR accept?

The LMK1D2104RHDR accepts CML, HCSL, LVCMOS, LVDS, and LVPECL input signals, giving designers flexibility to interface with a wide range of clock sources without external level translation.