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Analog Devices LTC6954IUFF-4#PBF — Clock & Timing ICs

LTC6954IUFF-4#PBF Clock Buffer 1:3 1.4GHz 36-QFN - Analog

MPNLTC6954IUFF-4#PBF
End of Life

Analog Devices LTC6954IUFF-4#PBF, Fanout Buffer (Distribution), Divider, 1 circuit, 1:3 ratio, 1.4 GHz max, LVCMOS/LVDS/LVPECL input, LVCMOS/LVDS output, 36-WFQFN Exposed Pad, -40°C to 105°C.

$19.73Ref. price · indicative, final on quote
Analog Devices LTC6954IUFF-4#PBF datasheet (PDF)
Packaging36-WFQFN Exposed Pad
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LTC6954IUFF-4#PBF specifications
ParameterValue
TypeFanout Buffer (Distribution), Divider
MountingSurface Mount
Voltage3.15V ~ 3.45V
Frequency1.4 GHz
Operating temperature-40°C ~ 105°C
InputLVCMOS, LVDS, LVPECL
OutputLVCMOS, LVDS
PackageTube
Case36-WFQFN Exposed Pad
Number of circuits1
Ratio - Input:Output1:3
Differential - Input:OutputYes/Yes

Product details

What this clock buffer does at 1.4 GHz

The LTC6954IUFF-4#PBF is a single-channel fanout buffer with an integrated divider, accepting LVCMOS, LVDS, or LVPECL inputs and delivering LVCMOS or LVDS outputs at a maximum frequency of 1.4 GHz. The 1:3 ratio means one input drives three output paths — useful for splitting a reference clock to multiple ADCs, FPGAs, or SerDes transceivers without adding jitter from a separate PLL.

The supply voltage range is tight at 3.15V to 3.45V — plan a clean 3.3V rail with ±5% tolerance; a switching regulator with 50 mV ripple will eat into that margin.

Housed in a 36-WFQFN with exposed pad, 4 mm x 7 mm body. Surface-mount only; no through-hole option.

For BOM planning, this line item is stable — no forced redesign or last-time buy horizon.

Frequently asked questions

Is LTC6954IUFF-4#PBF suitable for high-speed clock distribution?

Yes — the 1.4 GHz maximum frequency and differential input/output make it appropriate for distributing high-speed reference clocks to ADCs, DACs, or FPGAs. The 1:3 fanout keeps the signal path short and matched.

What is the difference between LTC6954IUFF-4#PBF and the LTC6957 variants?

The LTC6957 family (e.g., LTC6957IDD-2#PBF) is a fanout buffer only — no divider — with a maximum frequency of 300 MHz and a 1:2 ratio, versus the LTC6954's 1.4 GHz and 1:3 ratio with divider. The LTC6957 also tops out at 85°C, while the LTC6954IUFF-4#PBF extends to 105°C. These are not drop-in replacements; the LTC6954 is the higher-speed, wider-temperature option.