{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C199C-20VC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C199C-20VC","canonicalUrl":"https://icboms.com/infineon/CY7C199C-20VC","factsUrl":"https://icboms.com/api/mcp/products/CY7C199C-20VC","rawCanonicalId":null},"summary":{"shortDescription":"Cypress Semiconductor CY7C199C-20VC, 256Kbit Asynchronous SRAM, 32K x 8 organization, 20 ns access time, 4.5V to 5.5V supply, Parallel interface, 0°C to 70°C, 28-SOJ surface mount.","salesMarkdown":"## 20 ns access time — bus timing fit The Cypress CY7C199C-20VC is a 256Kbit asynchronous SRAM organized as 32K x 8 bits, with a 20 ns access time that determines whether it can serve a fast bus without wait states. Running on a 5V supply (4.5V to 5.5V), it uses a parallel interface and is housed in a 28-SOJ package (28-BSOJ, 0.300\" width). This part targets legacy 5V logic systems — think 68K or x86 embedded boards, telecom line cards, or test equipment from the late '90s through mid-2000s where the memory bus ran at 33 MHz or slower. The 20 ns access time gives roughly a 50 MHz bus cycle headroom before wait states are needed, assuming typical address-to-data setup margins. ## 32K x 8 — byte-wide memory map The 32K x 8 organization means this SRAM maps directly onto an 8-bit data bus with a 15-bit address bus (A0–A14). If your design uses a 16-bit or 32-bit bus, you will need two or four of these in parallel with a byte-lane decoder. The write cycle time matches the access time at 20 ns, so back-to-back writes run at the same speed as reads — no dead cycles for bus turnaround. That matters for designs that alternate read and write on every clock edge, like a dual-port FIFO emulation. ## 5V supply — not a 3.3V part The supply range is 4.5V to 5.5V, so this SRAM is strictly a 5V-logic device. If your system runs at 3.3V, this part will not operate — the inputs will not cross the VIH threshold, and the outputs will not swing rail-to-rail. A 3.3V-compatible async SRAM like the CY7C1021 series (with a 2.7V to 3.6V range) would be the correct choice for a low-voltage bus. If your design can tolerate a footprint change, a modern 256Kbit async SRAM in a TSOP-32 or SOIC-28 package (like the ISSI IS61LV25616AL) would be a more sustainable alternative, but that requires a board spin.","metaTitle":"Cypress CY7C199C-20VC 256Kbit Async SRAM, 20 ns, 5V, SOJ-28","metaDescription":"Cypress CY7C199C-20VC 256Kbit asynchronous SRAM, 32K x 8, 20 ns access time, 4.5V-5.5V supply, 0°C-70°C, SOJ-28.","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":"Tube","Technology":"SRAM - Asynchronous","Access Time":"20 ns","Memory Size":"256Kbit","Memory Type":"Volatile","Memory Format":"SRAM","Mounting Type":"Surface Mount","Package / Case":"28-BSOJ (0.300\\\", 7.62mm Width)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Memory Interface":"Parallel","Voltage - Supply":"4.5V ~ 5.5V","Base Product Number":"CY7C199","Memory Organization":"32K x 8","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"28-SOJ","Write Cycle Time - Word, Page":"20ns"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/aea969ef93c389c22f1244d5fae0f19f.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is CY7C199C-20VC obsolete?","answer":"Yes, Cypress has classified the CY7C199C-20VC as obsolete."},{"question":"What is the access time of CY7C199C-20VC?","answer":"The access time is 20 ns, which matches the write cycle time. This allows the SRAM to operate on a bus running up to about 50 MHz without wait states, assuming typical timing margins."},{"question":"Is CY7C199C-20VC compatible with 3.3V?","answer":"No. It will not operate reliably at 3.3V."},{"question":"Where can I buy CY7C199C-20VC?","answer":"Submit an RFQ for current availability and pricing — the part is quoted to order, not stocked on the shelf."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C199C-20VC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C199C-20VC 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}}