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Texas Instruments LMK1D1204RGTR — Clock & Timing ICs

LMK1D1204RGTR Clock Buffer 2:4 2 GHz LVDS - Texas

MPNLMK1D1204RGTR
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Texas Instruments LMK1D1204RGTR, Clock Buffer, 2:4 fanout, LVDS output, 2 GHz max frequency, 16-VFQFN exposed pad, -40°C to 105°C

$8.2400Ref. price · indicative, final on quote
Packaging16-VFQFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LMK1D1204RGTR specifications
ParameterValue
TypeClock Buffer
MountingSurface Mount
Supply voltage1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V
Frequency - max2 GHz
Operating temperature-40°C ~ 105°C (TA)
InputHCSL, LVCMOS, LVDS, LVPECL
OutputLVDS
PackageTape & Reel (TR) Cut Tape (CT)
Case16-VFQFN Exposed Pad
Number of circuits1
Ratio - Input:Output2:4
Differential - Input:OutputYes/Yes

Product details

2:4 fanout with universal input conditioning

The LMK1D1204RGTR is a 2:4 clock buffer from Texas Instruments that accepts HCSL, LVCMOS, LVDS, or LVPECL inputs and delivers LVDS outputs at up to 2 GHz. The 2:4 ratio means two selectable input banks feed four differential outputs — useful for splitting a reference clock to multiple SerDes or FPGA banks without adding a separate fanout tree. The supply voltage accepts three common rails: 1.71V–1.89V, 2.375V–2.625V, and 3.135V–3.465V. That covers 1.8V, 2.5V, and 3.3V systems directly, so the same BOM line works across a multi-voltage backplane without a local regulator.

Industrial temperature and QFN footprint

The differential input and output paths are both fully differential, which means the part preserves signal integrity on long PCB traces — the common-mode rejection rejects ground bounce that single-ended buffers pass through.

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Frequently asked questions

What is the frequency range of the LMK1D1204RGTR?

The maximum frequency is 2 GHz. The buffer operates from DC to that ceiling, so it covers common reference frequencies like 156.25 MHz, 312.5 MHz, and 1 GHz without issue.

Is the LMK1D1204RGTR compatible with 1.8V systems?

Yes. The supply voltage range includes 1.71V to 1.89V, which covers a nominal 1.8V rail. The LVDS output swing is specified for that supply, so no level shifter is needed.

Can LMK1D1204RGTR replace the CDCLVP1204RGTR?

The CDCLVP1204RGTR outputs LVPECL instead of LVDS. The input types overlap (LVCMOS, LVDS, LVPECL), but the output logic family differs — LVPECL requires DC termination to VCC-2V, while LVDS terminates to 100 ohms across the pair. They are not drop-in replacements; the board termination network must change.