{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LMK00338RTAT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LMK00338RTAT","canonicalUrl":"https://icboms.com/texas-instruments/LMK00338RTAT","factsUrl":"https://icboms.com/api/mcp/products/LMK00338RTAT","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LMK00338RTAT clock buffer, 400 MHz, 3:9 differential fanout, accepts CML/HCSL/HSTL/LVDS/LVPECL/SSTL/crystal inputs, outputs HCSL/LVCMOS, 40-WQFN (6x6), active.","salesMarkdown":"## Clock fanout for PCIe and SATA reference trees The LMK00338RTAT is a 3:9 differential clock buffer from Texas Instruments, designed to distribute reference clocks for PCI Express and SATA CPU interfaces. It accepts a wide range of input formats — CML, HCSL, HSTL, LVDS, LVPECL, SSTL, or a crystal — and outputs HCSL or LVCMOS, all with differential I/O (Yes/Yes). With a maximum frequency of 400 MHz, this part covers PCIe Gen1 (2.5 GT/s), Gen2 (5 GT/s), and Gen3 (8 GT/s) reference clocks, as well as SATA up to 6 Gbps. The 3:9 ratio means three input channels feed nine output copies — enough to distribute a clean clock to multiple endpoints on a server motherboard or switch fabric. ## Supply rails and temperature grade Operating from a single 3.15 V to 3.45 V supply, the LMK00338RTAT runs on a standard 3.3 V rail common in digital systems. The 40-WFQFN package with exposed pad (6x6 mm) requires a thermal land on the PCB to sink heat from the die.","metaTitle":"LMK00338RTAT Clock Buffer, 400MHz, 3:9 Fanout, Active","metaDescription":"Texas Instruments LMK00338RTAT clock buffer, 400MHz max, 3:9 differential fanout, accepts CML/HCSL/HSTL/LVDS/LVPECL/SSTL/crystal inputs.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Clock & Timing ICs"],"specifications":{"Mfr":"Texas Instruments","PLL":"No","Input":"CML, HCSL, HSTL, LVDS, LVPECL, SSTL, Crystal","Output":"HCSL, LVCMOS","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Main Purpose":"PCI Express (PCIe), SATA CPU","Mounting Type":"Surface Mount","Package / Case":"40-WFQFN Exposed Pad","Product Status":"Active","Frequency - Max":"400MHz","lifecycle_stage":"eol_hot","Voltage - Supply":"3.15V ~ 3.45V","Number of Circuits":"1","Base Product Number":"LMK00338","Ratio - Input:Output":"3:9","Operating Temperature":"-40°C~85°C","Supplier Device Package":"40-WQFN (6x6)","Differential - Input:Output":"Yes/Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.7600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f9848e2dda8581c37e0c2117def14c57.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LMK00338RTAT/alternatives.json"},"ai":{"faq":[{"question":"What input formats does the LMK00338RTAT accept?","answer":"The LMK00338RTAT accepts CML, HCSL, HSTL, LVDS, LVPECL, SSTL, and crystal inputs. It outputs HCSL or LVCMOS, with differential signaling on both sides."},{"question":"What is the maximum frequency of the LMK00338RTAT?","answer":"The maximum frequency is 400 MHz, which covers PCIe Gen1/2/3 and SATA reference clock requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LMK00338RTAT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LMK00338RTAT 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}}