{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C1399B-12ZC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C1399B-12ZC","canonicalUrl":"https://icboms.com/infineon/CY7C1399B-12ZC","factsUrl":"https://icboms.com/api/mcp/products/CY7C1399B-12ZC","rawCanonicalId":null},"summary":{"shortDescription":"Cypress CY7C1399B-12ZC, asynchronous SRAM, 256Kbit (32K x 8), 12 ns access time, parallel interface, 3V-3.6V supply, 28-TSOP I, 0°C-70°C.","salesMarkdown":"## Fast asynchronous SRAM for cache and buffer applications This part is intended for use as a fast scratchpad, cache tag memory, or data buffer in embedded systems, networking equipment, and test instrumentation where the 12 ns cycle time keeps pace with mid-speed processors and FPGAs without wait states. The 12 ns access time means the SRAM can complete a read or write cycle in 12 ns, which translates to a maximum bus frequency of roughly 83 MHz for back-to-back accesses. In practice, this allows a 66 MHz or 75 MHz bus to run without inserted wait states, saving logic and keeping memory latency deterministic. The write cycle time matches the read access at 12 ns, so mixed read/write traffic sees no penalty on the write side. Buyers should plan for last-time-buy quantities or qualify a pin-compatible alternative for new production. ## Package and footprint — 28-TSOP I It is surface-mount and intended for reflow soldering. The shipping medium is tray. The narrow 0.465-inch body is common for 28-pin TSOP I SRAMs, so the footprint is shared with many other 32K x 8 asynchronous SRAMs from Cypress, ISSI, and Alliance Memory, easing second-source qualification.","metaTitle":"CY7C1399B-12ZC Cypress 256Kbit SRAM, 12 ns Access, 28-TSOP I","metaDescription":"Cypress CY7C1399B-12ZC 256Kbit (32K x 8) asynchronous SRAM with 12 ns access time, 3V-3.6V supply, commercial temp 0°C-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":"-","Package":"Tray","Technology":"SRAM - Asynchronous","Access Time":"12 ns","Memory Size":"256Kbit","Memory Type":"Volatile","Memory Format":"SRAM","Mounting Type":"Surface Mount","Package / Case":"28-TSSOP (0.465\\\", 11.80mm Width)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Memory Interface":"Parallel","Voltage - Supply":"3V ~ 3.6V","Base Product Number":"CY7C1399","Memory Organization":"32K x 8","Operating Temperature":"0°C~70°C(TA)","Supplier Device Package":"28-TSOP I","Write Cycle Time - Word, Page":"12ns"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ece7e68f50620eb89e0b3d7eb36684f4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CY7C1399B-12ZC/alternatives.json"},"ai":{"faq":[{"question":"Is CY7C1399B-12ZC obsolete and what is the recommended replacement?","answer":"Yes, the CY7C1399B-12ZC is obsolete. For new designs, consider a pin-compatible 32K x 8 asynchronous SRAM in 28-TSOP I from ISSI (IS61LV256-12T) or Alliance Memory (AS6C62256-55TIN), but verify timing and supply voltage compatibility against your specific bus requirements."},{"question":"What are the exact timing specs (access time, voltage) for CY7C1399B-12ZC?","answer":"The access time is 12 ns for both read and write cycles. The memory is organized as 32K x 8 bits with a parallel interface."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C1399B-12ZC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C1399B-12ZC 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}}