{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY7C199CN-15PXC","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY7C199CN-15PXC","canonicalUrl":"https://icboms.com/infineon/CY7C199CN-15PXC","factsUrl":"https://icboms.com/api/mcp/products/CY7C199CN-15PXC","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY7C199CN-15PXC asynchronous SRAM, 256Kbit (32K x 8), 15 ns access time, 4.5V-5.5V supply, 28-pin DIP (0.300\"), through-hole, commercial temperature.","salesMarkdown":"## 256Kbit parallel SRAM in a hand-solderable DIP The CY7C199CN-15PXC is a 256Kbit asynchronous SRAM organized as 32K x 8 bits, with a 15 ns access time that matches the write cycle time — meaning the bus master can read or write any location in a single 15 ns window without wait states. It runs on a 4.5V to 5.5V supply rail, so it drops straight into legacy 5V logic systems or retrofits older CPU boards without a level translator. The 28-pin DIP package (0.300\" body width) is through-hole — you can hand-solder it on a perfboard or socket it for a breadboard prototype, which makes it a favourite for hobbyists repairing vintage computers or building 8-bit retro systems. ## What the 15 ns access time means for your bus If your processor runs at 40 MHz (25 ns cycle), the 15 ns access leaves 10 ns for address decoding, bus transceivers, and setup time at the CPU, which is tight but workable with fast logic. The write cycle time is also 15 ns, so byte-wide writes complete at the same speed as reads — no asymmetric penalty when the code mixes load and store operations. The parallel interface (32 data lines multiplexed as 8-bit bytes across the address space) connects directly to a microcontroller's external bus or an FPGA's SRAM controller without a serial-to-parallel conversion delay. ## Temperature grade and board-fit notes The 28-pin DIP footprint is 0.300\" (7.62 mm) wide with 0.100\" (2.54 mm) pin pitch — a standard socket or solder pads on 0.1\" grid protoboard fit without layout changes. Supply decoupling: place a 0.1 µF ceramic capacitor as close as possible to pins 28 (Vcc) and 14 (GND) — the 15 ns edge rates draw transient current that a distant cap cannot supply fast enough.","metaTitle":"Infineon CY7C199CN-15PXC SRAM, 256Kbit, 15ns, 28-DIP","metaDescription":"Infineon CY7C199CN-15PXC asynchronous SRAM, 256Kbit (32K x 8), 15 ns access, 4.5-5.5V, 28-pin DIP. 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":"-","Package":"Tube","Technology":"SRAM - Asynchronous","Access Time":"15 ns","Memory Size":"256Kbit","Memory Type":"Volatile","Memory Format":"SRAM","Mounting Type":"Through Hole","Package / Case":"28-DIP (0.300\\\", 7.62mm)","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-PDIP","Write Cycle Time - Word, Page":"15ns"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/6398b56c6f552b3095850c2846381043.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the memory organization of the CY7C199CN-15PXC?","answer":"32K words by 8 bits — 256Kbit total. The 8-bit data bus makes it a natural fit for 8-bit microprocessors (6502, Z80, 8051) or as a byte-wide scratchpad in a 16/32-bit system with byte-enable logic."},{"question":"Can I hand-solder this part on a breadboard?","answer":"Yes — the 28-pin DIP with 0.100\" pitch is the most breadboard-friendly SRAM package. You can solder it directly to a perfboard or plug it into a standard 28-pin DIP socket. No hot air or reflow profile needed."},{"question":"What supply voltage does the CY7C199CN-15PXC need?","answer":"A single 5V rail, 4.5V to 5.5V. It is not a 3.3V or 1.8V part — do not feed it lower than 4.5V or the internal sense amps may not resolve the stored bit correctly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY7C199CN-15PXC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY7C199CN-15PXC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:15:38.889Z","lastPublished":"2026-07-21T02:15:38.889Z","indexable":true}}