{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C421-15AXCT","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C421-15AXCT","canonicalUrl":"https://icboms.com/infineon/CY7C421-15AXCT","factsUrl":"https://icboms.com/api/mcp/products/CY7C421-15AXCT","rawCanonicalId":null},"summary":{"shortDescription":"Cypress CY7C421-15AXCT asynchronous FIFO, 4.5K (512 x 9) memory size, 15ns access time, 50MHz data rate, 4.5V~5.5V supply, 0°C~70°C, 32-TQFP (7x7), Tape & Reel.","salesMarkdown":"## Asynchronous FIFO for 5V data buffering — 15 ns access, 50 MHz throughput The Cypress CY7C421-15AXCT is a 4.5K (512 x 9) asynchronous FIFO memory designed for 5V data buffering applications. The 9-bit width (8 data bits plus a parity/flag bit) is typical for FIFO buffers used in DSP interfaces, parallel bus bridging, and data acquisition front-ends. The CY7C421-15AXCT is officially marked as Obsolete by Cypress (now Infineon). No direct replacement has been listed in the official lifecycle documentation. Buyers should verify stock position and lead time for a BOM line. ## Retransmit capability and expansion options This FIFO includes retransmit capability, allowing the read pointer to be reset to the beginning of the stored data without clearing the memory — useful for retry protocols in communication links. Expansion is supported in both depth and width, meaning multiple CY7C421 devices can be cascaded to create larger buffers or wider data paths. Note that programmable flags and FWFT (First-Word Fall-Through) are not supported, so flag logic is limited to the standard empty/full/half-full outputs.","metaTitle":"Cypress CY7C421-15AXCT FIFO, 4.5K 512x9, 15ns, 50MHz","metaDescription":"Cypress CY7C421-15AXCT asynchronous FIFO memory, 4.5K (512 x 9) depth, 15ns access time, 50MHz data rate, 32-TQFP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Mfr":"Infineon Technologies","Series":"CY7C","Package":"Tape & Reel (TR)","Function":"Asynchronous","Data Rate":"50MHz","Access Time":"15ns","Memory Size":"4.5K (512 x 9)","FWFT Support":"No","Mounting Type":"Surface Mount","Expansion Type":"Depth, Width","Package / Case":"32-TQFP","Product Status":"Obsolete","Bus Directional":"Uni-Directional","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5 V ~ 5.5 V","Base Product Number":"7C421","Operating Temperature":"0°C ~ 70°C","Retransmit Capability":"Yes","Current - Supply (Max)":"65mA","Supplier Device Package":"32-TQFP (7x7)","Programmable Flags Support":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d59f1eccb86f855370d4e99872a965d9.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is CY7C421-15AXCT obsolete?","answer":"Yes, the CY7C421-15AXCT is officially listed as Obsolete by Cypress/Infineon. No direct replacement has been announced. For existing designs, sourcing is through the surplus and broker market."},{"question":"What is the access time of CY7C421-15AXCT?","answer":"The access time is 15 ns. This is the time from read enable to valid data on the output bus, critical for timing closure in asynchronous interfaces."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C421-15AXCT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C421-15AXCT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}