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Analog Devices Inc./Maxim Integrated MAX6855UK29D6+T
- Part No.:
- MAX6855UK29D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK29D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,699
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Product details
Overview
The MAX6855UK29D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.925V reset threshold (suffix "29"), and 600ms–1200ms minimum reset timeout (suffix "D6"). It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C - used for reliable power-on reset and brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK29D6+T datasheet, MAX6855UK29D6+T pinout, MAX6855UK29D6+T application, or MAX6855UK29D6+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for low-power µP supervision with manual reset capability.
Technical Context
The MAX6855UK29D6+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over temperature, guaranteed RESET validity down to VCC = +1.1V, and immunity to VCC transients ≤40µs at 100mV overdrive. Its internal MR pullup is 10kΩ, and MR-to-reset delay is 250ns.
This variant belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT select functionality. It asserts an active-high push-pull RESET signal on VCC drop below 2.925V, MR assertion, or power failure - holding RESET high for ≥600ms after recovery before deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (factory-trimmed, ±2.5% tolerance) - sets precise brownout detection point for 3.0V/3.3V systems |
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 600ms minimum (D6 option) - ensures sufficient hold time for slow-start µPs and peripherals |
| Operating Voltage | 1.2V to 5.5V - supports single-cell Li-ion, NiMH, and 3.3V/5V logic domains |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup; drives directly into µP reset input |
| Temperature Range | -40°C to +85°C - qualified for industrial and portable medical environments |
| VCC Validity Limit | RESET remains valid down to VCC = +1.1V - prevents spurious release during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; sinks/source current per VOH/VOL specs |
| 2 | GND | Ground reference - must connect to system ground plane with low-impedance path |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; 1µs minimum pulse width |
| 4 | GND | Second ground terminal - improves noise immunity; tie to same ground as Pin 2 |
| 5 | VCC | Supply voltage input - monitors system rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - extends battery life in glucose monitors and wearables beyond 5 years |
| Guaranteed RESET validity | Down to VCC = +1.1V - ensures deterministic reset behavior even during severe undervoltage |
| No external components | Self-contained supervision - no RC network or pullups required for basic operation |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - avoids false resets in noisy DC-DC environments |
| MR glitch rejection | 200ns - suppresses EMI-induced noise on manual reset line without external filtering |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Portable handheld glucose meter powered by CR2032 coin cell, requiring fail-safe boot sequence and low-power sleep mode. IC Role / Device Role / Timing Role: Supervises 3.0V system rail and asserts active-high RESET to ARM Cortex-M0 MCU during power-up and brownout. Use Value: 170nA supply current enables >7-year battery life; 2.925V threshold matches nominal 3.0V battery discharge curve. |
Use Scenario: Battery-backed vital signs monitor with ECG, SpO₂, and temperature sensors operating in clinical and home settings. IC Role / Device Role / Timing Role: Provides deterministic power-on reset and brownout recovery for dual-core microcontroller with multi-rail power sequencing. Use Value: 600ms minimum reset timeout ensures full initialization of analog front-end and wireless SoC before firmware execution. |
| Smart Wearables | Industrial Handheld Terminals |
Use Scenario: Fitness tracker with Bluetooth LE, accelerometer, and OLED display, powered by rechargeable LiPo cell. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and triggers active-high RESET on voltage sag during RF transmission bursts. Use Value: Push-pull output eliminates external pullup resistor, reducing BOM count and PCB area in space-constrained designs. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics, exposed to wide ambient temperature swings and ESD events. IC Role / Device Role / Timing Role: Ensures reliable µP restart after cold start (-40°C) and protects against transient-induced lockup during motor drive switching. Use Value: -40°C to +85°C rating and 10kΩ internal MR pullup enable direct switch interface without level-shifting or debouncing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 2.93V threshold, 200ms reset timeout, open-drain RESET, 1.6µA ICC | Requires external pullup; higher current draw limits battery lifetime in ultra-low-power designs | Select when open-drain flexibility and TI ecosystem compatibility outweigh nanopower requirements |
| ADM6806-29ARTZ-R7 | 2.93V threshold, 200ms timeout, push-pull active-low RESET, 1.5µA ICC | Active-low output conflicts with µPs requiring active-high reset; incompatible pinout (SOT23-6) | Choose only if redesigning PCB layout and modifying reset logic polarity is acceptable |
Compared with TPS3837K33DBVR and ADM6806-29ARTZ-R7, the MAX6855UK29D6+T uniquely delivers sub-200nA current, factory-trimmed 2.925V threshold, and active-high push-pull output in pin-compatible SOT23-5 - enabling direct replacement where ultra-low ICC and simplified interface are critical.
Availability
MAX6855UK29D6+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart wearables, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX6855UK29D6+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 MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-critical portable equipment - delivering guaranteed reset behavior, minimal quiescent current, and robust transient immunity in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX6855UK29D6+T?
The MAX6855UK29D6+T has a factory-trimmed reset threshold of 2.925V, with ±2.5% tolerance over -40°C to +85°C. This value is defined by the "29" suffix in the part number and confirmed in Table 2 (Threshold Suffix Guide) of the datasheet. The device asserts RESET when VCC falls below this threshold and holds it asserted for ≥600ms after VCC rises above it.
Does the MAX6855UK29D6+T include a watchdog timer function?
No, the MAX6855UK29D6+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides voltage monitoring and manual reset only. Watchdog functionality is exclusive to MAX6864–MAX6869 variants (denoted by "S" or "L" suffixes). The MAX6855UK29D6+T pinout lacks WDI, confirming absence of watchdog circuitry.
What is the RESET output configuration of the MAX6855UK29D6+T?
The MAX6855UK29D6+T features an active-high push-pull RESET output (Pin 1). Unlike open-drain versions, it actively drives high and low without requiring an external pullup resistor. VOH is guaranteed ≥0.8×VCC at ISOURCE = 500µA, and VOL ≤0.3V at ISINK = 1.2mA - enabling direct interface with standard CMOS µP reset inputs.
Can the MAX6855UK29D6+T operate down to 1.2V supply voltage?
Yes, the MAX6855UK29D6+T is fully specified to operate from VCC = 1.2V to 5.5V. Its reset output remains valid down to VCC = +1.1V, ensuring reliable assertion even during deep brownout conditions. At 1.2V, supply current is 190nA (typ), and reset threshold accuracy remains within ±2.5% - making it suitable for single-cell LiFePO₄ or alkaline systems.
Is the MAX6855UK29D6+T pin-compatible with other SOT23-5 supervisors?
The MAX6855UK29D6+T uses the standard MAX6854/MAX6855/MAX6856 pinout: Pin 1 = RESET (active-high push-pull), Pins 2 & 4 = GND, Pin 3 = MR, Pin 5 = VCC. It is pin-compatible with TPS3836/TPS3837/TPS3838 per datasheet claim, but note that those TI parts have different RESET polarity and timeout options - electrical compatibility requires verification of output type and timing in the target application.
MAX6855UK29D6+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:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK29D6+T FAQ
1.How can I place an order for MAX6855UK29D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK29D6+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 MAX6855UK29D6+T reliable?
The price and inventory of MAX6855UK29D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK29D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK29D6+T?
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4.How is shipping managed for MAX6855UK29D6+T?
MAX6855UK29D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK29D6+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 MAX6855UK29D6+T?
For technical support, including MAX6855UK29D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK29D6+T requirements.
6.How does Aetrix verify that MAX6855UK29D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK29D6+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 MAX6855UK29D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK29D6+T?
All MAX6855UK29D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK29D6+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 MAX6855UK29D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK29D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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