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Analog Devices Inc./Maxim Integrated MAX6854UK29D3+T
- Part No.:
- MAX6854UK29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6854UK29D3+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
The MAX6854UK29D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 150ms minimum reset timeout. It asserts an active-low open-drain RESET output when VCC drops below 2.925V (typ), MR is pulled low, or during power-up/brownout - with guaranteed reset validity down to VCC = +1.1V. Designed for ultra-low-power portable medical and consumer devices like glucose monitors and MP3 players.
For engineers reviewing the MAX6854UK29D3+T datasheet, MAX6854UK29D3+T pinout, MAX6854UK29D3+T application, or MAX6854UK29D3+T equivalent, key selection criteria include its 2.925V factory-trimmed reset threshold, 170nA typical supply current at 2.5V, 150ms reset timeout (D3 option), open-drain RESET output, and immunity to sub-40µs VCC transients - all critical for battery-powered system reliability.
Technical Context
This device integrates a precision voltage comparator with ±2.5% threshold accuracy over temperature, a monostable reset timeout generator with 150ms (min) delay, and a CMOS-compatible manual reset input with 10kΩ internal pullup and 1µs minimum pulse width support. Its open-drain RESET output requires an external pullup and sinks up to 1.2mA at VCC ≥ 2.38V while maintaining VOL ≤ 0.3V.
The MAX6854UK29D3+T operates across VCC = 1.2V to 5.5V and guarantees functional reset assertion down to VCC = +1.1V. It features no external components requirement, 0.5% threshold hysteresis, and immunity to short VCC transients - validated by a normalized transient rejection curve showing <40µs duration at 100mV overdrive does not trigger spurious reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V (typ), ±2.5% tolerance - ensures reliable brownout detection at nominal 3.0V rail with margin |
| Supply Current | 170nA (typ) at VCC = 2.5V - enables multi-year operation on coin-cell batteries |
| Reset Timeout Period | 150ms (min), 225ms (typ), 300ms (max) - provides sufficient hold-off for µP initialization sequences |
| RESET Output Type | Open-drain active-low - allows level-shifting and wired-OR reset bus configurations |
| VCC Operating Range | 1.2V to 5.5V - supports single-supply operation across 1.8V, 2.5V, 3.3V, and 5V systems |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - ensures deterministic reset behavior during deep brownout |
| MR Input Pullup | 10kΩ internal resistor to VCC - eliminates need for external pullup in manual reset switch implementation |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; sinks ≥1.2mA at VCC ≥ 2.38V |
| 2 | GND | Ground reference for all internal circuitry and reset timing |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | GND | Second ground terminal - must be connected to same potential as Pin 2 for noise immunity |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical at 2.5V - extends battery life in always-on wearable and medical sensors |
| Factory-trimmed reset threshold | 2.925V (±2.5%) - eliminates calibration overhead and external resistor networks |
| No external components required | Self-contained supervision - reduces BOM count and PCB area in space-constrained designs |
| Immunity to short VCC transients | Rejects transients ≤40µs at 100mV overdrive - prevents false resets in noisy power environments |
| Guaranteed reset validity to 1.1V | Ensures deterministic reset assertion even during deep undervoltage conditions |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
Use Scenario: Continuous glucose sensing in disposable patch-style wearables powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervises 3.0V supply rail and initiates hard reset upon brownout or user-initiated recalibration. Use Value: 170nA quiescent current enables >5-year shelf life; 2.925V threshold matches typical battery discharge profile; open-drain RESET interfaces directly to low-voltage µP reset pin. |
Use Scenario: Battery-powered handheld ECG units requiring fail-safe boot sequence and watchdog-free operation. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset for field recalibration, with 150ms timeout ensuring full analog front-end stabilization. Use Value: Guaranteed reset validity to 1.1V prevents undefined µP state during battery swap; dual-GND pins reduce ground bounce in sensitive analog acquisition paths. |
| MP3 Player Power Management | Smart Hearing Aid Controllers |
Use Scenario: Low-power audio playback systems using Li-ion batteries with dynamic voltage scaling. IC Role / Device Role / Timing Role: Monitors switched-mode regulator output (3.3V) and asserts reset if voltage sags below safe operating level during high-current DAC bursts. Use Value: 150ms timeout accommodates worst-case regulator recovery; 1.2–5.5V operating range supports both pre- and post-LDO rails. |
Use Scenario: Miniaturized hearing aids with tight thermal and power budgets, relying on single-cell zinc-air batteries. IC Role / Device Role / Timing Role: Supervises 1.4V nominal supply and triggers reset before brownout-induced firmware corruption occurs. Use Value: Operation down to 1.2V VCC and reset assertion at 1.1V ensures robustness across full battery discharge curve; SOT23-5 footprint fits 3.2mm × 1.6mm PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.08V reset threshold (±0.5%), 350nA supply current, push-pull active-low RESET, same SOT23-5 package | Lacks MR input; tighter threshold tolerance but higher ICC compromises battery life | Select when absolute threshold precision outweighs ultra-low-power needs and manual reset is unnecessary |
| MAX6361LUR29+T | 2.93V reset threshold (±2.0%), 1.2µA supply current, open-drain RESET, SOT23-5 | Higher ICC limits use in multi-year battery applications; no MR input; wider temp range (–40°C to +125°C) | Prefer for industrial-grade designs where extended temperature range is mandatory and 1.2µA ICC is acceptable |
Compared with TPS3836K33DBVR and MAX6361LUR29+T, the MAX6854UK29D3+T uniquely combines 170nA ICC, MR input, and 2.925V threshold in open-drain configuration - making it optimal for long-life, user-serviceable portable medical electronics where reset flexibility and minimal power draw are co-primary requirements.
Availability
MAX6854UK29D3+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, and smart hearing aid controllers requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6854UK29D3+T 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and consumer applications.
The MAX6854UK29D3+T belongs to the nanopower µP supervisory family designed specifically for battery-critical portable medical and consumer electronics - emphasizing ultra-low ICC, precise reset thresholds, and robust transient immunity without external components.
FAQ
What is the exact reset threshold voltage of the MAX6854UK29D3+T?
The MAX6854UK29D3+T has a factory-trimmed reset threshold of 2.925V (typical), with ±2.5% tolerance over temperature (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "29" corresponds to 2.925V. The device guarantees reset assertion when VCC falls below this threshold and maintains reset for the full D3 timeout period (150ms min) after VCC recovers.
Does the MAX6854UK29D3+T include a watchdog timer function?
No, the MAX6854UK29D3+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 series, which provide only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to the MAX6864–MAX6869 variants (e.g., MAX6864UK29D3S+T), as clearly indicated in the Selector Guide and Pin Configurations section of the datasheet.
What type of RESET output does the MAX6854UK29D3+T feature?
The MAX6854UK29D3+T features an active-low open-drain RESET output (Pin 1), as specified in the MAX6854/MAX6855/MAX6856 Pin Description table and confirmed by the Selector Guide. This requires an external pullup resistor to the target logic supply and enables wired-OR reset bus configurations - distinct from push-pull variants like MAX6855 or MAX6858.
Can the MAX6854UK29D3+T operate reliably at VCC = 1.2V?
Yes, the MAX6854UK29D3+T is fully specified to operate at VCC = 1.2V (minimum), with guaranteed reset assertion down to VCC = +1.1V. Electrical Characteristics confirm functional operation across 1.2V to 5.5V, and the supply current remains at 170nA (typ) even at 1.8V - enabling robust supervision in ultra-low-voltage systems such as zinc-air battery-powered hearing aids.
Is the MAX6854UK29D3+T pin-compatible with other supervisory ICs?
The MAX6854UK29D3+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family in SOT23-5 package per the datasheet Features section, but functional differences exist - notably the MAX6854UK29D3+T includes MR input while TPS3836K33DBVR does not. Pin mapping matches: Pin 1=RESET, Pins 2&4=GND, Pin 3=MR, Pin 5=VCC. Always verify reset output type (open-drain vs. push-pull) before substitution.
MAX6854UK29D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6854UK29D3+T FAQ
1.How can I place an order for MAX6854UK29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6854UK29D3+T 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 MAX6854UK29D3+T reliable?
The price and inventory of MAX6854UK29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6854UK29D3+T is usually 5 days.
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Once your MAX6854UK29D3+T 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 MAX6854UK29D3+T?
For technical support, including MAX6854UK29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6854UK29D3+T requirements.
6.How does Aetrix verify that MAX6854UK29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6854UK29D3+T 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 MAX6854UK29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6854UK29D3+T?
All MAX6854UK29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6854UK29D3+T, 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 MAX6854UK29D3+T part is unused and in its original packaging.
Return procedure for MAX6854UK29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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