{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TPS3421EGDRYT","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"TPS3421EGDRYT","canonicalUrl":"https://icboms.com/texas-instruments/TPS3421EGDRYT","factsUrl":"https://icboms.com/api/mcp/products/TPS3421EGDRYT","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments TPS3421EGDRYT, Reset Timer, monitors 2 voltages, adjustable/selectable threshold, active-low open-drain output, 320ms minimum reset timeout, -40°C to 125°C, 6-UFDFN (6-SON 1.45x1) package, surface mount.","salesMarkdown":"## Dual-voltage reset timer for processor power sequencing The Texas Instruments TPS3421EGDRYT is a reset timer IC that monitors two supply voltages and asserts an active-low, open-drain reset output when either rail falls below the programmed threshold. The reset output remains low for a minimum of 320 ms after both voltages return within tolerance, giving the downstream processor or FPGA time to complete its initialization sequence. The threshold voltage is adjustable via external resistors, so the part can be set to trip at any voltage the designer chooses — useful for non-standard rails or when precise margin control is needed. ## 320 ms reset timeout — what it buys the system The 320 ms minimum reset pulse width covers the power-on reset delay of most MCUs, FPGAs, and SoCs. Because the output is open drain, multiple reset sources (this timer, a manual reset button, a watchdog) can be wire-ORed to the same reset line. Just add a pull-up resistor to the processor's supply rail. ## Package and footprint for tight PCB layouts The TPS3421EGDRYT comes in a 6-UFDFN package with a 1.45 mm x 1 mm body.","metaTitle":"TPS3421EGDRYT Reset Timer, Active Low, Open Drain, 320ms","metaDescription":"Texas Instruments TPS3421EGDRYT Reset Timer: monitors 2 voltages, adjustable threshold, open-drain active-low output, 320ms min reset timeout.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Texas Instruments","Type":"Reset Timer","Reset":"Active Low","Output":"Open Drain or Open Collector","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Mounting Type":"Surface Mount","Reset Timeout":"320ms Minimum","Package / Case":"6-UFDFN","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"TPS3421","Voltage - Threshold":"Adjustable/Selectable","Operating Temperature":"-40°C~125°C(TJ)","Supplier Device Package":"6-SON (1.45x1)","Number of Voltages Monitored":"2"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.6100","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/6cbc4277f08711171806b2aded4c9bdd.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TPS3421EGDRYT/alternatives.json"},"ai":{"faq":[{"question":"What is the reset timeout of TPS3421EGDRYT?","answer":"The reset timeout is a minimum of 320 ms. The output stays low for at least that long after all monitored voltages rise above the threshold."},{"question":"Is TPS3421EGDRYT compatible with adjustable threshold voltages?","answer":"Yes. The voltage threshold is adjustable or selectable via external resistor dividers, so you can set the trip point to match any supply rail within the device's operating range."},{"question":"Does TPS3421EGDRYT have an open drain output?","answer":"Yes. The reset output is open drain (or open collector), which allows wired-OR connections with other reset sources. An external pull-up resistor to the appropriate supply rail is required."},{"question":"Is TPS3421EGDRYT active low or active high?","answer":"The reset output is active low. It asserts a low level when a fault is detected and remains low for the 320 ms timeout period after the fault clears."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/TPS3421EGDRYT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/TPS3421EGDRYT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}