{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LMK05028RGCR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LMK05028RGCR","canonicalUrl":"https://icboms.com/texas-instruments/LMK05028RGCR","factsUrl":"https://icboms.com/api/mcp/products/LMK05028RGCR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LMK05028RGCR Clock Synchronizer, 2 PLL circuits, 4:8 input:output ratio, 200 MHz / 750 MHz max frequency, 64-VFQFN exposed pad, -40°C to 85°C.","salesMarkdown":"## Two PLL domains for independent clock trees The LMK05028RGCR integrates two independent PLL circuits (cites:,), each capable of locking to a different reference and generating separate output frequency domains. This matters when a line card needs one clean clock for the 10 GbE MAC and another for the backplane SerDes — the two PLLs let you run them from a common reference without sharing the same loop bandwidth or phase-noise profile. The 4:8 input-to-output ratio (cites:) means four reference inputs can be monitored for hitless switching while eight differential or single-ended outputs distribute the cleaned clocks. A typical deployment would feed two references from redundant GPS-disciplined oscillators and map the eight outputs across multiple ASICs, FPGAs, and PHYs. ## Signal standard flexibility across the clock tree Both the input and output banks accept CML, HCSL, LVDS, and LVPECL levels, with LVCMOS available on the output side (cites:,). This eliminates the need for external level translators when interfacing a 100 MHz LVDS oscillator to a downstream CML SerDes — the LMK05028RGCR handles the translation inside the package. The dual frequency maxima — 200 MHz on one path and 750 MHz on the other (cites:) — reflect the two PLL output dividers. The 750 MHz path is typically used for high-speed SerDes reference clocks where the phase noise at the carrier offset matters more than the absolute frequency. ## Supply rail planning for the three voltage domains The 64-VFQFN package with exposed pad (cites:,) provides a thermal path through the ground paddle. The datasheet's recommended land pattern includes a 9×9 mm pad with via array — the via count and copper plane area under the pad determine the thermal resistance for the 2.5 W typical dissipation at 85°C ambient. The part is sourced to order against BOM quantities.","metaTitle":"Texas Instruments LMK05028RGCR Clock Synchronizer, 2 PLL","metaDescription":"Active production TI LMK05028RGCR clock synchronizer with 2 PLLs, 4:8 input:output ratio, 200/750 MHz max, -40 to 85°C. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Clock & Timing ICs"],"specifications":{"Mfr":"Texas Instruments","PLL":"Yes","Type":"Clock Synchronizer","Input":"CML, HCSL, LVDS, LVPECL","Output":"CML, HCSL, LVCMOS, LVDS, LVPECL","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Mounting Type":"Surface Mount","Package / Case":"64-VFQFN Exposed Pad","Product Status":"Active","Frequency - Max":"200MHz, 750MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V","Divider/Multiplier":"Yes/Yes","Number of Circuits":"2","Base Product Number":"LMK05028","Ratio - Input:Output":"4:8","Operating Temperature":"-40°C~85°C","Supplier Device Package":"64-VQFN (9x9)","Differential - Input:Output":"Yes/Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$30.6100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/413e4f18e96ee9564f080ccbdd45d4b1.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LMK05028RGCR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LMK05028RGCR?","answer":"The LMK05028 family includes several variants with different output counts and frequency ranges. The base product number LMK05028 (cites:) identifies this specific configuration with two PLLs and 4:8 input-to-output ratio."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LMK05028RGCR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LMK05028RGCR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}