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Analog Devices Inc./Maxim Integrated MAX6856UK29D3+T
- Part No.:
- MAX6856UK29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6856UK29D3+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,606
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Product details
Overview
MAX6856UK29D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-low open-drain reset output, manual reset input (MR), and factory-trimmed 2.925V reset threshold. It asserts reset during VCC brownout, MR assertion, or watchdog timeout (not applicable to MAX6856), with 150ms minimum reset timeout period and 170nA typical supply current at 2.5V. Designed for ultra-low-power battery-backed systems like glucose monitors and portable medical devices.
For engineers reviewing the MAX6856UK29D3+T datasheet, MAX6856UK29D3+T pinout, MAX6856UK29D3+T application, or MAX6856UK29D3+T equivalent, key selection criteria include its 2.925V ±2.5% reset threshold, guaranteed reset validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, and compatibility with 1.2V–5.5V supply rails - critical for reliable power-on reset in energy-constrained embedded designs.
Technical Context
The MAX6856UK29D3+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and an internal reset timeout generator. Its reset assertion logic combines VCC monitoring (falling-edge detection at 2.925V) and asynchronous MR input, with deassertion delayed by a fixed 150ms (D3 option) after both VCC exceeds threshold and MR is released.
No watchdog timer is present - confirmed by Selector Guide (MAX6856 lacks WDI pin) and Pin Description (no WDI function listed). The device uses BiCMOS process (2848 transistors) and requires no external components beyond standard 0.1µF VCC bypass capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V ±2.5% - precisely sets brownout detection point for 3.0V nominal rails; ensures deterministic reset before µP functional failure. |
| Supply Current (typ) | 170nA at VCC = 2.5V - enables multi-year battery life in always-on medical sensors without compromising reset reliability. |
| Reset Timeout Period | 150ms (min) - provides sufficient hold time for µP initialization and peripheral stabilization after power recovery. |
| Operating Voltage Range | 1.2V to 5.5V - supports wide-input battery systems (e.g., single Li-ion or dual alkaline) while maintaining reset validity down to 1.1V. |
| Reset Output Type | Active-Low Open-Drain - allows level-shifting to higher-voltage µP reset inputs (up to 5.5V) using external pull-up. |
| VCC Transient Immunity | Immune to ≤40µs glitches at 100mV overdrive - prevents false resets in noisy portable environments. |
| MR Input Pullup | Internal 10kΩ to VCC - eliminates need for external pullup; supports direct switch-to-GND manual reset with no debounce required. |
Pinout & Package
Package: 5-pin SOT23-5 (1.6mm × 2.9mm × 1.1mm), lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; requires external pullup resistor to target logic rail; sinks ≥50µA at VCC ≥1.1V. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS-compatible logic levels. |
| 4 | GND | Second ground terminal - electrically tied to Pin 2 internally; improves noise immunity in high-frequency layouts. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF ceramic capacitor to GND adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered devices like patient monitors. |
| Guaranteed reset validity to VCC = +1.1V | Ensures clean reset assertion even during deep brownout - critical for fail-safe behavior in medical instrumentation. |
| No external components required | Eliminates BOM cost and layout area; only mandatory component is 0.1µF VCC bypass capacitor. |
| Factory-trimmed reset threshold | 2.925V ±2.5% tolerance removes need for external resistor divider calibration in production. |
| Immunity to short VCC transients | Rejects <40µs supply glitches - avoids spurious resets in ESD-prone handheld equipment. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose meters powered by CR2032 coin cells operating across -20°C to +50°C ambient. IC Role / Device Role / Timing Role: Supervises 3.0V rail during cold-start and battery depletion; asserts reset if VCC drops below 2.925V during sensor calibration sequence. Use Value: Prevents corrupted ADC readings or firmware lockup by guaranteeing µP reset before analog front-end enters undefined state. |
Use Scenario: Portable ECG/SpO₂ monitors with dual power sources (battery + USB charging) and strict IEC 60601-1 safety requirements. IC Role / Device Role / Timing Role: Provides fail-safe power-on reset and manual reset via front-panel button; validates reset down to 1.1V during USB hot-plug transitions. Use Value: Meets Class BF isolation timing requirements by ensuring deterministic reset within 150ms of VCC stabilization. |
| Industrial Handheld Scanners | Low-Power IoT Edge Sensors |
|
Use Scenario: Rugged barcode scanners using alkaline AA batteries in warehouse environments with frequent mechanical shock-induced supply noise. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output; suppresses false resets from vibration-induced VCC dips using 40µs transient immunity. Use Value: Increases mean time between failures (MTBF) by eliminating 99% of nuisance resets caused by drop impacts. |
Use Scenario: Wireless temperature/humidity nodes powered by energy harvesting (e.g., solar + supercapacitor) with intermittent 1.8V–3.6V supply. IC Role / Device Role / Timing Role: Acts as power-good detector and reset arbiter; holds µP in reset until harvested energy stabilizes above 2.925V for ≥150ms. Use Value: Enables reliable cold-start from near-zero energy states without external supervisor sequencing logic. |
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 fixed reset threshold; 200ms timeout; push-pull active-low output; 1.6µA ICC (typ) | Higher supply current limits battery life in multi-year deployments; push-pull output restricts level-shifting flexibility. | Select when board space permits larger SOT-23-5 footprint and system uses 3.3V rail with tighter threshold tolerance needs. |
| STM6315SW13F | 2.93V reset threshold; 200ms timeout; open-drain output; 1.2µA ICC (typ); -40°C to +125°C rating | Higher ICC reduces battery longevity; extended temp range unnecessary for consumer medical use. | Prefer for automotive-adjacent industrial applications requiring AEC-Q100 qualification and wider thermal margin. |
Compared with TPS3836K33DBVR and STM6315SW13F, the MAX6856UK29D3+T delivers 7× lower supply current and identical reset threshold accuracy while retaining open-drain flexibility - making it optimal for coin-cell-powered medical wearables where every nanoamp affects service interval.
Availability
MAX6856UK29D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, and industrial handheld scanners requiring stable component supply across long product lifecycles and low-volume production ramps.
Supply support for MAX6856UK29D3+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 precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX685x family was designed specifically for ultra-low-power microprocessor supervision in battery-critical medical and portable electronics, emphasizing nanoscale current consumption and robust reset timing under dynamic supply conditions.
FAQ
What is the exact reset threshold voltage of the MAX6856UK29D3+T?
The MAX6856UK29D3+T has a factory-trimmed reset threshold voltage of 2.925V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "29" corresponds to 2.925V, and is validated in Electrical Characteristics (VTH parameter). The MAX6856UK29D3+T maintains this specification without external calibration.
Does the MAX6856UK29D3+T include a watchdog timer function?
No, the MAX6856UK29D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description, MAX6856 variants lack the WDI pin and associated watchdog circuitry - confirmed by absence of WDI in its pinout and omission from its functional diagram. Watchdog capability is exclusive to MAX6864–MAX6869 series.
What is the reset timeout period for the MAX6856UK29D3+T and how is it set?
The MAX6856UK29D3+T has a fixed 150ms minimum reset timeout period (D3 option), as indicated by the "D3" suffix in its part number. This value is specified in Table 4 (Reset Timeout Periods) and is factory-programmed - no external components or pin strapping is required to configure it.
Can the MAX6856UK29D3+T operate reliably at VCC = 1.2V?
Yes, the MAX6856UK29D3+T is fully specified to operate from VCC = 1.2V to 5.5V. Its reset output remains valid down to VCC = 1.1V (guaranteed), and supply current is characterized at 1.2V (7µA max when reset asserted). This enables use in single-cell lithium or NiMH systems with undervoltage protection.
What package type and lead finish does the MAX6856UK29D3+T use?
The MAX6856UK29D3+T uses a 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish, as indicated by the "+T" suffix per Maxim's Ordering Information. Dimensions are 1.6mm × 2.9mm × 1.1mm, and thermal characteristics align with standard SOT23 derating (571mW at +70°C).
MAX6856UK29D3+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
MAX6856UK29D3+T FAQ
1.How can I place an order for MAX6856UK29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6856UK29D3+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 MAX6856UK29D3+T reliable?
The price and inventory of MAX6856UK29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6856UK29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6856UK29D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6856UK29D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6856UK29D3+T?
MAX6856UK29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6856UK29D3+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 MAX6856UK29D3+T?
For technical support, including MAX6856UK29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6856UK29D3+T requirements.
6.How does Aetrix verify that MAX6856UK29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6856UK29D3+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 MAX6856UK29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6856UK29D3+T?
All MAX6856UK29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6856UK29D3+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 MAX6856UK29D3+T part is unused and in its original packaging.
Return procedure for MAX6856UK29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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