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STMicroelectronics STM6524AHARDL6F
- Part No.:
- STM6524AHARDL6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 6-UFDFN
- Datasheet:
-
STM6524AHARDL6F.pdf
- Description:
- IC SUPERVISOR SMART RESET 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,190
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Product details
Overview
STM6524AHARDL6F from STMicroelectronics is a 6-pin Smart Reset™ supervisor IC designed for delayed, dual-button controlled system reset in portable electronics. It features factory-programmed 4.0 s Smart Reset™ setup delay (tSRC), active-low open-drain RST output with no internal pull-up, and operates across 1.65 V to 5.5 V supply range. Used in smartphones and e-books to prevent spurious resets from brief button presses.
For engineers reviewing the STM6524AHARDL6F datasheet, STM6524AHARDL6F pinout, STM6524AHARDL6F application, or STM6524AHARDL6F equivalent, key selection criteria include tSRC timing accuracy over –40 °C to +85 °C, dual active-low SR inputs requiring simultaneous assertion, absence of power-on reset, and compatibility with microcontroller interrupt-driven reset arbitration.
Technical Context
The STM6524AHARDL6F implements a dual-input, edge- and level-sensitive Smart Reset™ logic: both SR0 and SR1 must be held low for ≥4.0 s (typ.) before asserting RST. Its reset pulse width is fully push-button controlled - deassertion occurs immediately upon release of either input, with no fixed tREC.
No internal VCC monitoring is present (VRST = none), and the device lacks power-on reset functionality. It enters test mode via overvoltage on SR0 (>VCC + 0.9 V), enabling shortened tSRC-INI (42 ms typ.) and tSRC-SHORT (21 ms typ.) for rapid validation without full power cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 1.65 V to 5.5 V - supports single-cell Li-ion, 3.3 V, and 5 V rails without external regulation. |
| Smart Reset™ delay (tSRC) | 4.0 s (typ.), factory-programmed - ensures intentional user action before hard reset, eliminating accidental reboots. |
| Supply current (ICC) | 1.5 µA at VCC = 5.0 V - enables multi-year battery life in always-on portable devices. |
| Reset output type | Active-low open drain, no internal pull-up - requires external pull-up for logic-level compatibility and voltage translation. |
| Operating temperature | –40 °C to +85 °C - qualified for consumer handheld and automotive cabin-adjacent environments. |
| Input logic levels | VIL ≤ 0.3 V, VIH ≥ 0.85 VCC - ensures robust noise immunity and compatibility with standard GPIOs. |
| Package | UDFN6, 1.6 mm × 1.3 mm × 0.55 mm - ultra-compact footprint for space-constrained PCB layouts. |
Pinout & Package
UDFN6 package: 1.6 mm × 1.3 mm, 0.40 mm pitch, 6-terminal exposed pad configuration. RoHS-compliant ECOPACK®2 construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VSS | Ground reference | Primary return path for all internal circuitry; must be low-impedance connection to system ground plane. |
| 2 SR1 | Secondary Smart Reset™ input | Active-low push-button input; requires external pull-up if internal option disabled; must be held low simultaneously with SR0 for tSRC. |
| 3 RST | Reset output | Active-low open-drain output; requires external pull-up resistor for defined high state; deasserts immediately when either SR input releases. |
| 4 NC | No connect | Not bonded internally; must be connected to VSS per datasheet recommendation to ensure mechanical stability and thermal performance. |
| 5 SR0 | Primary Smart Reset™ input | Active-low push-button input with test-mode trigger capability (V > VCC + 0.9 V); same timing dependency as SR1. |
| 6 VCC | Positive supply | Power input; requires 0.1 µF ceramic decoupling capacitor placed adjacent to pin for stable operation across load transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Smart Reset™ inputs (SR0/SR1) | Enables two-button reset arbitration - prevents accidental reset while supporting dedicated service or recovery functions. |
| Factory-programmed tSRC = 4.0 s | Eliminates external timing components and firmware dependencies for consistent, reliable reset delay across production units. |
| No power-on reset (POR) | Reduces BOM count and simplifies power sequencing where POR is handled elsewhere (e.g., SoC or PMIC). |
| Test mode with overvoltage entry | Allows functional verification without power cycling - critical for in-system debug and automated test during manufacturing. |
| Glitch-immune input logic | tSRC acts as inherent filter - only sustained low states ≥4.0 s trigger reset, rejecting ESD-induced or contact-bounce transients. |
Applications
| Smartphone Recovery Mode | e-Book System Reset |
|---|---|
|
Use Scenario: User holds both volume-down + power buttons for >4 s to force reboot after OS freeze. IC Role / Device Role / Timing Role: Dual-input Smart Reset™ supervisor enforcing hardware-level reset timing, decoupled from CPU execution state. Use Value: Guarantees reset only after deliberate user action, avoiding unintended reboots during normal button navigation. |
Use Scenario: E-reader fails to respond to touch input; user presses front-panel reset switch for 5 s. IC Role / Device Role / Timing Role: Delayed reset controller interfacing directly with MCU GPIO interrupts and reset line. Use Value: Enables safe recovery without removing battery or opening enclosure - critical for sealed consumer devices. |
| Portable Navigation Device (PND) Hard Reset | MP3 Player Firmware Recovery |
|
Use Scenario: GPS unit locks up during route calculation; user activates recessed dual-button sequence. IC Role / Device Role / Timing Role: Hardware reset arbiter that distinguishes short press (interrupt) from long press (system reset). Use Value: Preserves user data and settings during soft interrupt while enabling full restart when needed. |
Use Scenario: Audio player freezes mid-playback; user holds play/pause + menu buttons for >4 s. IC Role / Device Role / Timing Role: Push-button reset interface with precise 4.0 s threshold, independent of firmware responsiveness. Use Value: Ensures deterministic recovery even when audio codec or flash controller blocks main processor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input delayed reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM6524ALARDL6F | tSRC = 6.0 s (typ.), otherwise identical pinout, package, and RST configuration | Requires longer user hold time; better suited for devices where accidental activation risk is higher | Select when extended delay improves UX safety without changing board layout or firmware logic. |
| STM6524APARDL6F | tSRC = 7.5 s (typ.), same open-drain RST, no tREC, UDFN6 package | Higher timing margin against transient noise; used in ruggedized portable equipment | Choose for industrial handhelds or medical devices needing stricter reset initiation discipline. |
Compared with STM6524AHARDL6F, ALARDL6F extends tSRC to 6.0 s for enhanced accidental-press immunity, while APARDL6F further increases it to 7.5 s - all retain identical pinout, supply range, and push-button-controlled RST behavior, enabling drop-in timing upgrades without redesign.
Availability
STM6524AHARDL6F is available at Aetrix Electronics and suitable for smartphone recovery mode, e-book system reset, portable navigation device hard reset, and MP3 player firmware recovery requiring stable component supply across consumer electronics production cycles.
Supply support for STM6524AHARDL6F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.
The STM65xx Smart Reset™ family targets portable electronics requiring robust, low-power, hardware-enforced reset arbitration - specifically engineered to replace mechanical reset switches and simplify firmware reset handling.
FAQ
Does STM6524AHARDL6F provide power-on reset (POR) functionality?
No. The STM6524AHARDL6F does not include power-on reset. It asserts RST only after both SR0 and SR1 are held low for ≥4.0 s (typ.). System initialization must be handled separately by the host processor or another supervisor IC.
What is the function of Pin 4 (NC) and how should it be connected?
Pin 4 is not internally bonded and serves no electrical function. Per ST's datasheet recommendation, it must be connected to VSS (ground) to ensure mechanical stability, optimal thermal dissipation, and consistent UDFN6 package solder joint reliability.
Can the reset output (RST) be used without an external pull-up resistor?
No. STM6524AHARDL6F uses an open-drain RST output with no internal pull-up (as indicated by "A" in the part number suffix). An external pull-up resistor is mandatory to define the high logic state; value depends on bus capacitance and rise-time requirements.
How is test mode entered and verified on this device?
Test mode is entered by applying ≥VCC + 0.9 V to SR0 (e.g., 4.2 V when VCC = 3.3 V). Entry is confirmed by RST asserting for tSRC-INI (42 ms typ.), then remaining asserted while SR0 stays overvoltage - providing visual or logic-level feedback that test mode is active.
STM6524AHARDL6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Smart Reset™
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Reset Timer
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UDFN (1.6x1.3)
STM6524AHARDL6F FAQ
1.How can I place an order for STM6524AHARDL6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6524AHARDL6F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM6524AHARDL6F reliable?
The price and inventory of STM6524AHARDL6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6524AHARDL6F is usually 5 days.
3.What payment methods are accepted for STM6524AHARDL6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6524AHARDL6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6524AHARDL6F?
STM6524AHARDL6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6524AHARDL6F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM6524AHARDL6F?
For technical support, including STM6524AHARDL6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6524AHARDL6F requirements.
6.How does Aetrix verify that STM6524AHARDL6F is sourced from the original manufacturer or authorized distributors?
All STM6524AHARDL6F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM6524AHARDL6F meets industry standards.
7.What is the process for return or replacement of STM6524AHARDL6F?
All STM6524AHARDL6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6524AHARDL6F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM6524AHARDL6F part is unused and in its original packaging.
Return procedure for STM6524AHARDL6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6524AHARDL6F Tags
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MIC826SYMT-TR
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