{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C4221-15JXCT","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C4221-15JXCT","canonicalUrl":"https://icboms.com/infineon/CY7C4221-15JXCT","factsUrl":"https://icboms.com/api/mcp/products/CY7C4221-15JXCT","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C series synchronous FIFO memory, CY7C4221-15JXCT, 9K (1K x 9), 66.7 MHz data rate, 10 ns access time, 32-PLCC J-lead, tape and reel.","salesMarkdown":"## Synchronous FIFO in a 32-PLCC footprint The Infineon CY7C4221-15JXCT is a 9K (1K x 9) synchronous FIFO memory from the CY7C series, clocked at 66.7 MHz with a 10 ns access time. The part supports depth and width expansion via programmable flags, but lacks FWFT and retransmit capability. ## 66.7 MHz clock, 10 ns access — what it buys you The 66.7 MHz synchronous interface means data transfers happen on each clock edge, not on asynchronous read/write strobes — this simplifies the control logic in a system that already has a clock domain at or below that rate. The 10 ns access time is the window from clock edge to data valid on the output bus; at 66.7 MHz (15 ns period) you have 5 ns of setup margin before the next clock edge, enough for moderate board trace lengths without signal-integrity tuning. The 9-bit width (1K x 9) is the classic FIFO depth for 8-bit data plus a parity or control bit — common in telecom framers, serial-to-parallel converters, and glue logic between buses of different widths. The ninth bit can carry an end-of-packet marker or error flag without stealing a data byte. Programmable flags (almost-full, almost-empty) let the system controller pre-empt the FIFO boundary before the hard flags fire — useful for DMA burst termination or interrupt generation at a configurable watermark. Depth and width expansion are supported, so multiple parts can cascade for deeper or wider buffers without external arbitration logic. Infineon lists the CY7C4221-15JXCT as obsolete. ## 32-PLCC J-lead — board-fit note The 32-PLCC package (11.43 x 13.97 mm body) uses J-leads on a 1.27 mm pitch — a standard footprint for PLCC sockets or direct solder. The J-lead profile gives a lower seated height than gull-wing, useful in mezzanine or card-edge assemblies where board-to-board clearance is tight. The package is surface-mount only; no through-hole variant exists for this part.","metaTitle":"Infineon CY7C4221-15JXCT 9K Sync FIFO, 66.7MHz, 10ns","metaDescription":"Infineon CY7C4221-15JXCT synchronous FIFO memory, 9K (1K x 9), 66.7 MHz data rate, 10 ns access time, 32-PLCC. Obsolete — sourced to order against RFQ.","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":"Synchronous","Data Rate":"66.7MHz","Access Time":"10ns","Memory Size":"9K (1K x 9)","FWFT Support":"No","Mounting Type":"Surface Mount","Expansion Type":"Depth, Width","Package / Case":"32-LCC (J-Lead)","Product Status":"Obsolete","Bus Directional":"Uni-Directional","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5 V ~ 5.5 V","Base Product Number":"7C4221","Operating Temperature":"0°C~70°C","Retransmit Capability":"No","Current - Supply (Max)":"35mA","Supplier Device Package":"32-PLCC (11.43x13.97)","Programmable Flags Support":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b0115a44e89566724ee3f49375c67cf8.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy CY7C4221-15JXCT and check current availability?","answer":"This part is obsolete from Infineon. Submit an RFQ for lot quantities and traceability details."},{"question":"What is the closest pin-compatible alternative to CY7C4221-15JXCT?","answer":"The CY7C series includes other synchronous FIFO densities, but pinout and timing may differ. A functional replacement would require reviewing the system's clock domain, flag requirements, and package footprint before selecting an alternative."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C4221-15JXCT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C4221-15JXCT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:18:50.932Z","lastPublished":"2026-07-21T02:18:50.932Z","indexable":true}}