{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"54F189DC","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"54F189DC","canonicalUrl":"https://icboms.com/texas-instruments/54F189DC","factsUrl":"https://icboms.com/api/mcp/products/54F189DC","rawCanonicalId":null},"summary":{"shortDescription":"Fairchild 54F series 64-bit SRAM, 16 x 4 organization, 8.5 ns access time, 4.5 V supply, parallel interface, through-hole package, 0°C to 70°C.","salesMarkdown":"## 64-bit bipolar TTL SRAM — 8.5 ns access time The 54F189DC is a 64-bit bipolar TTL SRAM from the 54F series, organized as 16 words by 4 bits. Its 8.5 ns access time makes it one of the faster small SRAMs from the TTL era, suited for cache tag stores, writable control store, or high-speed scratchpad in legacy TTL-based systems. The 4.5 V supply rail is a reminder this is a bipolar part — it won't run on a 3.3 V or 5.0 V CMOS supply without level shifting. ## 16 x 4 organization — what it fits With only 64 bits total, the 54F189DC is not a code-storage memory. Its natural home is as a register file for a 4-bit datapath, a FIFO buffer for a narrow bus, or a look-up table for a state machine. The parallel interface keeps the pin count low — 16 pins in a through-hole package — and the write cycle time of 15.5 ns means back-to-back writes are possible at over 64 MHz. ## Through-hole package and temperature grade The part comes in a through-hole package (Bulk shipping form), which means it's designed for socketed or wave-soldered boards — not for high-density SMT reflow. No extended temp or automotive qualification is listed. That said, this is a legacy bipolar TTL part, not a mainstream CMOS memory.","metaTitle":"54F189DC 64-Bit Bipolar TTL SRAM, 8.5 ns Access Time","metaDescription":"54F189DC is a 64-bit (16x4) bipolar TTL SRAM with 8.5 ns access time and 4.5 V supply. Active lifecycle, through-hole package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"series":"54F","frame_size":"64bit","Access Time":"8.5 ns","memory_type":"Volatile","package_type":"Bulk","Memory Format":"RAM","mounting_type":"Through Hole","interface_type":"Parallel","product_status":"Active","lifecycle_stage":"eol_hot","supply_voltage_v":"4.5","Memory Organization":"16 x 4","Operating Temperature High":"0°C to 70°C (TA)","Write Cycle Time - Word, Page":"15.5ns"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.49","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/16a05b9c99795446f6bc451c33486e64.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/54F189DC/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 54F189DC and how do I get a price?","answer":"54F189DC is sourced through independent distribution."},{"question":"What is the memory organization of 54F189DC?","answer":"The memory is organized as 16 words by 4 bits, for a total of 64 bits."},{"question":"What is the speed (access time) of 54F189DC?","answer":"The access time is 8.5 ns."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/54F189DC","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/54F189DC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}