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Analog Devices Inc./Maxim Integrated MAX6855UK29D4+T
- Part No.:
- MAX6855UK29D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK29D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
MAX6855UK29D4+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 2.925V factory-trimmed reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and immunity to VCC transients down to 40µs at 100mV overdrive. It ensures reliable µP initialization in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK29D4+T datasheet, MAX6855UK29D4+T pinout, MAX6855UK29D4+T application, or MAX6855UK29D4+T equivalent, this page delivers verified electrical parameters, functional pin mapping, real-world use cases, and validated alternative options for low-power system reset management.
Technical Context
The MAX6855UK29D4+T implements a precision voltage monitor with hysteresis (0.5% of VTH) and a fixed 1200ms reset timeout timer. Its MR input features 10kΩ internal pullup, 1µs minimum pulse width, and 200ns glitch rejection-enabling robust manual reset initiation without external components.
Reset assertion is guaranteed valid down to VCC = +1.1V, and supply current remains ultra-low at 170nA (typ) at 1.8V, rising to 400nA at 5.0V. The active-high push-pull RESET output drives high with VOH ≥ 0.8×VCC (ISOURCE = 500µA) and sinks low with VOL ≤ 0.3V (ISINK = 1.2mA at VCC ≥ 2.38V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V ±2.5% - precisely trimmed to monitor 3.0V nominal rails with brownout margin |
| Reset Timeout | 1200ms min - ensures full µP boot sequence completion before release |
| Supply Current | 170nA typ at 1.8V - enables >10-year battery life in always-on glucose monitors |
| VCC Valid Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail systems |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup; directly interfaces to µP nRESET inputs |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies switch interface; no external resistor required |
| Transient Immunity | Immune to 40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy environments |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; deasserts low after timeout; referenced to VCC |
| 2 | GND | Ground reference - must connect to system ground plane for stable threshold accuracy |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; 1µs minimum pulse width; 200ns glitch rejection |
| 4 | GND | Second ground terminal - improves noise immunity; connect to same ground as Pin 2 |
| 5 | VCC | Supply and monitored voltage input - requires 0.1µF ceramic bypass capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current at 1.8V - extends battery life in wearable medical devices |
| Guaranteed reset validity | Operates down to VCC = +1.1V - ensures reset assertion even during deep brownout |
| No external components | Integrated 10kΩ MR pullup and precision voltage reference - reduces BOM count and PCB area |
| Factory-trimmed threshold | 2.925V ±2.5% - eliminates calibration overhead and improves production yield |
| Push-pull active-high RESET | VOH ≥ 0.8×VCC at 500µA - directly drives standard µP reset inputs without level-shifting |
Applications
| Glucose Monitors | Portable ECG Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 3.0V rail and initiates controlled µP reset on battery sag or firmware hang. Use Value: 170nA quiescent current enables >5-year shelf life; 1200ms timeout accommodates BLE stack initialization. |
Use Scenario: Handheld single-lead ECG with real-time waveform display and SD card logging. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and triggers hard reset if ADC or display controller locks up. Use Value: Active-high RESET directly interfaces to ARM Cortex-M0+ nRESET; 2.925V threshold aligns with 3.3V rail tolerance. |
| Smart Wearable Trackers | Industrial Sensor Nodes |
Use Scenario: Step-counting wristband using ultra-low-power MCU and MEMS accelerometer. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via tactile button connected to MR. Use Value: Internal 10kΩ MR pullup eliminates discrete resistor; 1µs MR pulse width supports fast mechanical switch bounce. |
Use Scenario: LoRaWAN temperature/humidity node deployed in remote locations with primary AA batteries. IC Role / Device Role / Timing Role: Ensures deterministic µP startup after cold temperature-induced voltage droop. Use Value: Immunity to 40µs VCC transients prevents false resets during RF transmit bursts; -40°C to +85°C rating ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K29QDBVR | 2.93V threshold, 1200ms timeout, active-high push-pull, but 2.5µA ICC (15× higher) | Higher supply current limits use in >5-year battery applications | Select when TI ecosystem alignment or AEC-Q100 qualification is required |
| ADM6805-29ARTZ-RL7 | 2.93V threshold, 1200ms timeout, active-high open-drain, 1.2µA ICC, requires external pullup | Open-drain output adds BOM cost and complicates logic-level compatibility | Select when mixed-voltage reset signaling (e.g., 1.8V µP with 3.3V reset rail) is needed |
Compared with MAX6855UK29D4+T, TPS3837K29QDBVR consumes significantly more current, limiting battery lifetime, while ADM6805-29ARTZ-RL7 requires an external pullup resistor and lacks push-pull drive strength-making MAX6855UK29D4+T optimal for space-constrained, ultra-low-power medical wearables.
Availability
MAX6855UK29D4+T is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, smart wearables, and industrial sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for MAX6855UK29D4+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX685x family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, factory-trimmed accuracy, and robust reset timing without external components.
FAQ
What is the exact reset threshold voltage of MAX6855UK29D4+T?
The MAX6855UK29D4+T has a factory-trimmed reset threshold of 2.925V with ±2.5% tolerance over -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 nominal. The device guarantees reset assertion when VCC falls below this threshold and remains asserted until VCC exceeds it plus hysteresis (0.5% of VTH).
Does MAX6855UK29D4+T include a watchdog timer?
No, MAX6855UK29D4+T does not include a watchdog timer. Per the Selector Guide and Pin Configurations, only MAX6864–MAX6869 variants feature WDI input; MAX6855 belongs to the MR-only subgroup (no WDI pin, no watchdog circuitry). Its functionality is limited to voltage monitoring, manual reset, and fixed 1200ms timeout reset generation.
What is the function of Pin 4 on MAX6855UK29D4+T?
Pin 4 on MAX6855UK29D4+T is a second GND terminal, not a no-connect or I.C. pin. As shown in the MAX6854/MAX6855/MAX6856 Pin Description table and Top View diagram, Pins 2 and 4 are both labeled GND. This dual-ground configuration improves noise immunity and thermal performance in the 5-pin SOT23 package.
Can MAX6855UK29D4+T operate with VCC below 1.2V?
MAX6855UK29D4+T is specified to operate down to VCC = +1.2V per Absolute Maximum Ratings and Electrical Characteristics tables. While reset output remains valid down to +1.1V, full functional specification (including supply current, timing, and threshold accuracy) is guaranteed only within the 1.2V–5.5V range. Operation below 1.2V is not characterized and may result in undefined behavior.
Is MAX6855UK29D4+T pin-compatible with other MAX685x variants?
Yes, MAX6855UK29D4+T shares the identical 5-pin SOT23-5 footprint and pinout (RESET, GND, MR, GND, VCC) with MAX6854, MAX6856, MAX6858, and MAX6860. However, output polarity differs: MAX6855 provides active-high push-pull RESET, whereas MAX6854 is active-low push-pull and MAX6856 is active-low open-drain-requiring schematic review before substitution.
MAX6855UK29D4+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:
- Obsolete
- 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:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK29D4+T FAQ
1.How can I place an order for MAX6855UK29D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK29D4+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 MAX6855UK29D4+T reliable?
The price and inventory of MAX6855UK29D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK29D4+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK29D4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK29D4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK29D4+T?
MAX6855UK29D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK29D4+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 MAX6855UK29D4+T?
For technical support, including MAX6855UK29D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK29D4+T requirements.
6.How does Aetrix verify that MAX6855UK29D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK29D4+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 MAX6855UK29D4+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK29D4+T?
All MAX6855UK29D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK29D4+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 MAX6855UK29D4+T part is unused and in its original packaging.
Return procedure for MAX6855UK29D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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