{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C4221-15JXC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C4221-15JXC","canonicalUrl":"https://icboms.com/infineon/CY7C4221-15JXC","factsUrl":"https://icboms.com/api/mcp/products/CY7C4221-15JXC","rawCanonicalId":null},"summary":{"shortDescription":"Cypress CY7C4221-15JXC synchronous FIFO, 66.7 MHz data rate, 10 ns access time, 9K (1K x 9) memory size, 32-PLCC (J-Lead), 4.5 V–5.5 V supply, 0°C to 70°C.","salesMarkdown":"## Synchronous FIFO for bus-rate matching and data buffering The Cypress CY7C4221-15JXC is a synchronous FIFO memory from the CY7C series, organized as 1K x 9 bits (9 Kbit total). The 9-bit width accommodates an eighth data bit plus a parity or control bit, common in telecom and networking equipment. The CY7C4221-15JXC is marked obsolete by Cypress (now Infineon). For production or repair requirements, this part must be sourced through the surplus and broker channel. The 66.7 MHz clock rate sets the maximum write/read cycle frequency. The 35 mA maximum supply current is modest for a 5 V FIFO of this speed. ## 1K x 9 depth and programmable flags The 1K x 9 organization provides 1024 words of storage, each 9 bits wide. The part supports programmable flags (almost-full, almost-empty) via the flag-programming pins, allowing the designer to set threshold levels that trigger flow-control logic. Depth and width expansion are supported, so multiple devices can be cascaded for larger buffers. It does not support First-Word Fall-Through (FWFT) operation. ## 32-PLCC (J-Lead) footprint and temperature grade The 32-PLCC package (J-Lead, 11.43 x 13.97 mm body) is a surface-mount footprint with leads formed under the package — it requires a PLCC socket or a reflow profile compatible with J-lead soldering.","metaTitle":"CY7C4221-15JXC Synchronous FIFO, 66.7 MHz, 9K (1K x 9)","metaDescription":"Cypress CY7C4221-15JXC synchronous FIFO memory, 66.7 MHz data rate, 10 ns access time, 9K (1K x 9) depth, 32-PLCC. Request quote.","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":"Tube","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/a7b146673824ba494f9688cebdc79959.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy CY7C4221-15JXC?","answer":"The CY7C4221-15JXC is obsolete and sourced through independent distribution."},{"question":"Is CY7C4221-15JXC obsolete?","answer":"Yes, the CY7C4221-15JXC is listed as obsolete by Cypress (Infineon)."},{"question":"Does CY7C4221-15JXC support FWFT?","answer":"No, the CY7C4221-15JXC does not support First-Word Fall-Through (FWFT) operation. It uses standard synchronous FIFO read/write timing with programmable flags."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C4221-15JXC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C4221-15JXC 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}}