Texas Instruments LMK05028RGCT — Clock & Timing ICs
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Texas Instruments / Clock & Timing ICs

TI LMK05028RGCT Clock Synchronizer, Dual DPLL, 750MHz Max

MPN LMK05028RGCT
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Texas Instruments LMK05028RGCT dual DPLL clock synchronizer, 4:8 input:output, supports CML/HCSL/LVDS/LVPECL I/O, 200MHz/750MHz max frequency, 1.71V–3.465V supply, -40°C to 85°C, 64-VQFN (9x9) package.

In Stock: 193 pcs
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[SPEC] Essential Parameters Snapshot Full Specifications (14)
Package / Case 64-VFQFN Exposed Pad
Supply Voltage 1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V

Full Technical Specifications

14 Parameters
LMK05028RGCT specifications
Parameter / AttributeSpecification / Value
TypeClock Synchronizer
MountingSurface Mount
Supply voltage1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V
Frequency - max200MHz, 750MHz
Operating temperature-40°C~85°C
PLLYes
InputCML, HCSL, LVDS, LVPECL
OutputCML, HCSL, LVCMOS, LVDS, LVPECL
PackageTape & Reel (TR); Cut Tape (CT)
Case64-VFQFN Exposed Pad
Divider (Multiplier)Yes/Yes
Number of circuits2
Ratio - Input:Output4:8
Differential - Input:OutputYes/Yes
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Technical Details & Description

Dual DPLL clock synchronizer for precision timing

It accepts four differential or single-ended inputs (CML, HCSL, LVDS, LVPECL) and provides eight outputs in the same formats plus LVCMOS, covering both baseband and high-speed SerDes reference clocking in a single device. The dual DPLL architecture supports hitless reference switching and holdover, making it a fit for telecom base stations, networking switches, and industrial equipment that require ITU-T G.8262 / G.8123 compliant jitter generation.

Dual frequency ceiling: 200 MHz and 750 MHz

The part specifies two maximum output frequencies: 200 MHz and 750 MHz. The 200 MHz ceiling covers common Ethernet and FPGA fabric clocks; the 750 MHz path handles high-speed SerDes reference clocks (e.g., 10G/25G PCS) without an external PLL. With a 4:8 input-to-output ratio, the device can fan out multiple independent clock domains from a single oscillator, reducing the number of discrete clock ICs on the board.

Supply rail flexibility and package

Housed in a 64-VFQFN with exposed pad (9x9 mm body), the package provides a low-inductance thermal path for the dual DPLL's power dissipation.

Frequently asked questions

What output types does LMK05028RGCT support?

The device outputs CML, HCSL, LVCMOS, LVDS, and LVPECL formats. This range covers both differential high-speed SerDes clocks and single-ended logic-level clocks without external level translators.

What is the maximum frequency of LMK05028RGCT?

Two maximum frequencies are specified: 200 MHz for baseband/FPGA fabric clocks and 750 MHz for high-speed SerDes reference clocks.

What are the recommended alternatives to LMK05028RGCT?

The CD74HCT7046AE is a single PLL with 1:2 input:output ratio and 38 MHz maximum frequency, operating from 4.5 V supply in a through-hole package. It is not a functional replacement for the LMK05028RGCT's dual DPLL, 750 MHz output, or differential signaling capability.

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