{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C4245-15ASXC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C4245-15ASXC","canonicalUrl":"https://icboms.com/infineon/CY7C4245-15ASXC","factsUrl":"https://icboms.com/api/mcp/products/CY7C4245-15ASXC","rawCanonicalId":null},"summary":{"shortDescription":"Cypress CY7C4245-15ASXC synchronous FIFO, 4K x 18 memory size, 66.7 MHz data rate, 10 ns access time, 64-LQFP package, 0°C to 70°C operating temperature.","salesMarkdown":"## What this FIFO does in a system The Cypress CY7C4245-15ASXC is a synchronous FIFO memory with a 4K x 18 organization, clocked at 66.7 MHz and delivering a 10 ns access time. It is designed for unidirectional data buffering between two clock domains or bus widths, common in telecom line cards, DSP coprocessor interfaces, and FPGA-to-backplane bridges. The 18-bit word width accommodates 16-bit data plus two control or parity bits without external muxing. Retransmit capability and programmable flags give the system designer flexible flow control without polling the FIFO status. ## 66.7 MHz clock and 10 ns access — what they buy you At 66.7 MHz the FIFO can sustain a 66.7 million words-per-second read or write rate, assuming no flag stalls. The 10 ns access time from the rising clock edge to data valid on the outputs sets the bus timing margin for the receiving logic. With a 15 ns clock period, the 10 ns access leaves 5 ns for PCB trace delay, setup time of the downstream device, and clock jitter — tight but workable with 50-ohm controlled impedance traces under 100 mm. If the receiving FPGA or ASIC has a 2 ns input setup, the margin drops to 3 ns; a board spin or slower speed grade may be needed. If the design is still in development, consider migrating to a current-production synchronous FIFO in a compatible 64-LQFP footprint, such as the CY7C42xxV series with 3.3 V supply, though pin compatibility must be verified against the specific density and flag options. ## Package and temperature — board-fit constraints","metaTitle":"CY7C4245-15ASXC Synchronous FIFO, 66.7 MHz, 10 ns, 72K","metaDescription":"Cypress CY7C4245-15ASXC synchronous FIFO, 4K x 18, 66.7 MHz data rate, 10 ns access time. 64-LQFP, 0-70°C.","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":"Tray","Function":"Synchronous","Data Rate":"66.7MHz","Access Time":"10ns","Memory Size":"72K (4K x 18)","FWFT Support":"No","Mounting Type":"Surface Mount","Expansion Type":"Depth, Width","Package / Case":"64-LQFP","Product Status":"Obsolete","Bus Directional":"Uni-Directional","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5 V ~ 5.5 V","Base Product Number":"7C4245","Operating Temperature":"0°C ~ 70°C","Retransmit Capability":"Yes","Current - Supply (Max)":"45mA","Supplier Device Package":"64-TQFP (14x14)","Programmable Flags Support":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/5199db9d222c30634275f6ec45108ff8.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is CY7C4245-15ASXC obsolete?","answer":"Yes, the lifecycle status is Obsolete. Cypress no longer manufactures this part, and there is no listed official successor. Any procurement must go through the surplus or broker market."},{"question":"What is the difference between CY7C4245-15ASXC and CY7C4245-15AXC?","answer":"The two order codes share the same die and speed grade (66.7 MHz, 10 ns) but differ in packaging or shipping medium. The -15ASXC suffix indicates a Tray package, while -15AXC typically refers to a Tape & Reel variant. Functionally they are identical; the choice is driven by the assembly house's feeder preference."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C4245-15ASXC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C4245-15ASXC 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}}