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Analog Devices Inc./Maxim Integrated MAX6855UK36D4+T
- Part No.:
- MAX6855UK36D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK36D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
MAX6855UK36D4+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, providing active-high push-pull reset output, manual reset input (MR), and factory-trimmed 3.600V reset threshold with 1200ms minimum reset timeout. It monitors VCC supply integrity and asserts reset during power-up, brownout, or manual trigger - used in battery-powered medical sensors and portable instrumentation.
For engineers reviewing the MAX6855UK36D4+T datasheet, MAX6855UK36D4+T pinout, MAX6855UK36D4+T application, or MAX6855UK36D4+T equivalent, key selection criteria include its 170nA typical supply current, guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, and compatibility with low-voltage µP reset inputs requiring active-high logic polarity.
Technical Context
The MAX6855UK36D4+T implements a precision voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, paired with a fixed 1200ms reset timeout timer. Its MR input features internal 10kΩ pullup and 250ns MR-to-reset delay, enabling reliable external reset initiation without external components.
This variant belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT select functionality. It delivers push-pull active-high RESET output referenced to VCC, with VOH ≥ 0.8×VCC at ISOURCE = 500µA and VOL ≤ 0.3V at ISINK = 1.2mA - ensuring robust interfacing with 1.8V/2.5V/3.3V µPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.600V (factory-trimmed, ±2.5% tolerance) - sets precise brownout detection point for 3.3V systems with margin |
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in always-on monitoring devices |
| Reset Timeout | 1200ms minimum - ensures µP completes full initialization before release from reset state |
| Operating Voltage | 1.2V to 5.5V - supports wide-input industrial and portable applications including Li-ion and alkaline supplies |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains valid logic level through deep brownout, preventing metastability in µP reset input |
| Output Type | Push-pull active-high - eliminates need for external pullup resistor and simplifies PCB layout vs open-drain |
| Package | 5-pin SOT23 - 2.9mm × 1.6mm footprint ideal for space-constrained portable designs |
Pinout & Package
MAX6855UK36D4+T uses a 5-pin SOT23-5 package with exposed pad (not electrically connected). Pin 1 is RESET (active-high push-pull), Pin 2 and Pin 4 are GND, Pin 3 is MR (active-low manual reset), and Pin 5 is VCC. The device requires no external components beyond standard 0.1µF VCC bypass capacitor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during normal operation; pulls low only during reset assertion |
| 2, 4 | GND | Ground reference - both pins must be connected to common system ground plane for noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-level signals or momentary switch to GND |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and wearable health sensors |
| VCC transient immunity | Rejects <40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| No external components | Self-contained supervision - eliminates BOM cost and board area for RC timing networks or pullup resistors |
| Reset validity to 1.1V | Ensures clean reset deassertion even during deep brownout - avoids µP lockup in low-power sleep modes |
| SOT23-5 footprint | Industry-standard 5-pin package - enables drop-in replacement and compatibility with existing pick-and-place workflows |
Applications
| Portable Medical Sensors | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Continuous glucose monitoring patch operating from CR2032 coin cell for 90+ days. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and triggers µP reset on battery voltage sag below 3.6V. Use Value: 170nA ICC minimizes quiescent drain; 1200ms timeout ensures ADC calibration completes before µP resumes sampling. |
Use Scenario: Handheld multimeter with auto-ranging and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and provides active-high reset to ARM Cortex-M0+ MCU during power-on and low-battery shutdown. Use Value: Push-pull active-high output directly interfaces with µP's reset pin without level-shifting; 1.1V validity prevents reset release instability during battery depletion. |
| Wearable Health Trackers | Low-Power IoT Edge Nodes |
Use Scenario: Optical heart-rate sensor worn 24/7, powered by rechargeable LiPo with 3.0–4.2V range. IC Role / Device Role / Timing Role: Detects VCC drop below 3.6V threshold and holds µP in reset until stable 3.3V LDO output is confirmed. Use Value: Factory-trimmed 3.600V threshold provides exact margin above 3.3V rail; MR pin allows user-initiated firmware update reset. |
Use Scenario: Soil moisture sensor node deployed in remote fields, powered by solar-charged LiFePO4 (2.8–3.6V). IC Role / Device Role / Timing Role: Ensures ESP32-WROOM-32 boots reliably after dawn power-up when VCC rises slowly from 2.8V. Use Value: Guaranteed reset assertion down to VCC = 1.1V prevents partial initialization; 1200ms timeout accommodates slow LDO startup and RF module wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms timeout, open-drain active-low output | Requires external pullup; less suitable for active-high µP inputs without inversion logic | Select when system uses 3.3V rail with tighter tolerance and lower-cost open-drain interface is acceptable |
| MAX6315US36D3+T | Same 3.6V threshold and 1200ms timeout, but push-pull active-low output and 1.1µA ICC | Higher supply current reduces battery life in ultra-low-power applications | Choose only if active-low reset polarity is required and 1.1µA ICC is acceptable for the application lifetime target |
Compared with TPS3837K33DBVR and MAX6315US36D3+T, the MAX6855UK36D4+T uniquely combines 3.6V threshold, 1200ms timeout, active-high push-pull output, and 170nA ICC - making it optimal for long-life, space-constrained, active-high reset systems where minimal quiescent power is critical.
Availability
MAX6855UK36D4+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered instrumentation, and wearable health trackers requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK36D4+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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanoscale ICC, wide VCC range, and robust reset timing under brownout conditions.
FAQ
What is the exact reset threshold voltage of MAX6855UK36D4+T?
The MAX6855UK36D4+T has a factory-trimmed reset threshold of 3.600V, 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 "36" corresponds to 3.600V nominal. The MAX6855UK36D4+T maintains this accuracy without external calibration or trimming components.
Does MAX6855UK36D4+T include a watchdog timer function?
No, the MAX6855UK36D4+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides only voltage monitoring and manual reset (MR) functionality. Watchdog capability is exclusive to MAX6864–MAX6869 variants, identifiable by "S" or "L" suffixes in the ordering code - absent in MAX6855UK36D4+T.
What is the reset output configuration of MAX6855UK36D4+T?
The MAX6855UK36D4+T features an active-high push-pull reset output (RESET), as confirmed in the Pin Description table and Selector Guide. Unlike open-drain or active-low variants, this configuration drives high during normal operation and pulls low only during reset assertion - eliminating the need for an external pullup resistor and simplifying interface with µPs requiring active-high reset inputs.
Can MAX6855UK36D4+T operate with supply voltages below 1.8V?
Yes, the MAX6855UK36D4+T operates from VCC = 1.2V to 5.5V and guarantees valid reset output down to VCC = +1.1V. Electrical Characteristics confirm functional operation at 1.2V minimum, with supply current rising to 190nA at VCC = 1.8V. This enables use in deep-sleep systems powered by partially discharged batteries or low-voltage energy harvesters.
Is MAX6855UK36D4+T pin-compatible with other devices in the MAX6854–MAX6869 family?
The MAX6855UK36D4+T shares the same 5-pin SOT23-5 pinout as MAX6854, MAX6856, MAX6861–MAX6863, and MAX6864–MAX6869 variants - with RESET on Pin 1, GND on Pins 2/4, MR on Pin 3, and VCC on Pin 5. However, functional differences (e.g., output polarity, presence of WDI or CT pins) mean electrical compatibility requires verification per application; physical pin alignment alone does not ensure drop-in substitution.
MAX6855UK36D4+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:
- 3.6V
- 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
MAX6855UK36D4+T FAQ
1.How can I place an order for MAX6855UK36D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK36D4+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 MAX6855UK36D4+T reliable?
The price and inventory of MAX6855UK36D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK36D4+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK36D4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK36D4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK36D4+T?
MAX6855UK36D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK36D4+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 MAX6855UK36D4+T?
For technical support, including MAX6855UK36D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK36D4+T requirements.
6.How does Aetrix verify that MAX6855UK36D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK36D4+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 MAX6855UK36D4+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK36D4+T?
All MAX6855UK36D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK36D4+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 MAX6855UK36D4+T part is unused and in its original packaging.
Return procedure for MAX6855UK36D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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