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Analog Devices Inc./Maxim Integrated MAX6855UK36D5+T
- Part No.:
- MAX6855UK36D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK36D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,461
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Product details
Overview
The MAX6855UK36D5+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and a factory-trimmed 3.6V reset threshold. It asserts reset during VCC brownout, MR assertion, or watchdog timeout (not applicable to MAX6855), with a guaranteed 450ms minimum reset timeout period and ultra-low 170nA typical supply current. It is designed for reliable power-up sequencing and fault recovery in battery-powered medical and portable electronics.
For engineers reviewing the MAX6855UK36D5+T datasheet, MAX6855UK36D5+T pinout, MAX6855UK36D5+T application, or MAX6855UK36D5+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing behavior, true low-power operation down to 1.1V VCC, and validated alternatives for voltage-monitoring supervisory design.
Technical Context
The MAX6855UK36D5+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a digital reset timeout timer that guarantees deassertion only after ≥450ms following VCC rise above 3.6V and MR release. Its active-high push-pull RESET output is referenced to VCC and sinks up to 500µA while sourcing ≥0.8×VCC at 500µA load.
No watchdog timer or CT input is present - the MAX6855 variant excludes both WDI and CT pins, distinguishing it from MAX6864–MAX6869 and MAX6861–MAX6863 families. The MR input features internal 10kΩ pullup, 1µs minimum pulse width support, and 200ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.600V ±2.5% (factory-trimmed; ensures reliable detection of 3.3V rail brownout) |
| Reset Timeout Period | 450ms min (D5 option; holds µP in reset long enough for full power stabilization) |
| Supply Current | 170nA typ at +25°C (enables >10-year battery life in always-on glucose monitors) |
| VCC Operating Range | 1.2V to 5.5V (guaranteed reset validity down to 1.1V supports ultra-low-voltage wake-up) |
| RESET Output Type | Active-high push-pull (drives µP reset pin directly without external pullup; logic-compatible with 1.8V–5V I/O) |
| MR Input Behavior | Active-low with 10kΩ internal pullup; 250ns MR-to-reset delay ensures fast fault response |
| Package | 5-pin SOT23 (2.9mm × 1.6mm footprint; compatible with high-density portable PCB layouts) |
Pinout & Package
Package: 5-pin SOT23 (lead-free, RoHS-compliant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output asserted high during reset; drives µP reset pin directly; no external components needed |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane |
| 3 | MR (active-low) | Manual reset input; internally pulled up to VCC; assert low ≥1µs to trigger reset |
| 4 | GND | Second ground pin for improved noise immunity and thermal dissipation |
| 5 | VCC | Supply voltage input monitored for brownout; bypass with 0.1µF capacitor to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on coin-cell batteries |
| Guaranteed reset validity to 1.1V | Ensures deterministic reset assertion even during deep brownout or cold-temperature startup |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy power rails |
| No external components required | Integrates pullup on MR, precision voltage reference, and timeout timer - reduces BOM count and board area |
| Push-pull active-high RESET | Eliminates need for external pullup resistor; simplifies interface to µP reset inputs expecting active-high logic |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail integrity and initiates controlled µP reset upon brownout or user-initiated recalibration. Use Value: Prevents corrupted sensor data writes during power collapse; 450ms timeout ensures stable ADC reference before firmware restart. |
Use Scenario: Wearable ECG/SpO₂ patch recording vital signs for 72+ hours on a single CR2032 cell. IC Role / Device Role / Timing Role: Monitors main LDO output and asserts active-high reset to ARM Cortex-M0+ when VCC dips below 3.6V. Use Value: 170nA quiescent current extends battery life; guaranteed reset down to 1.1V avoids undefined state during cold-weather discharge. |
| Industrial Handheld Scanners | Smart Asset Trackers |
Use Scenario: Rugged barcode scanner operating across -20°C to +60°C with intermittent 2G/4G transmission bursts. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for the application processor and PMIC sequencer. Use Value: ±2.5% threshold accuracy ensures consistent trip point across temperature; dual-GND pins reduce ground bounce during RF transmit events. |
Use Scenario: GPS-enabled logistics tracker reporting location every 4 hours using LoRaWAN, powered by primary lithium thionyl chloride cell. IC Role / Device Role / Timing Role: Supervises backup rail powering real-time clock and nonvolatile memory during main battery depletion. Use Value: 1.2V–5.5V operating range supports wide input from aging primary cells; no external components simplify conformal coating and 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 |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed threshold; 200ms reset timeout; open-drain active-low output | Requires external pullup; less suitable for active-high µP reset inputs | Select when interfacing legacy µPs requiring active-low reset and 3.3V rail monitoring only |
| MAX6316LUK36D3+T | Same 3.6V threshold and SOT23-5 package; 150ms reset timeout; active-low open-drain output | Lacks MR input; no manual reset capability | Choose only for simple power-on reset where operator-initiated reset is unnecessary |
Compared with TPS3837K33DBVR and MAX6316LUK36D3+T, the MAX6855UK36D5+T uniquely combines 3.6V threshold, active-high push-pull output, manual reset input, and 450ms timeout - enabling direct replacement in systems requiring robust brownout recovery and user-triggered reset without layout changes.
Availability
MAX6855UK36D5+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6855UK36D5+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 portable systems.
The MAX6854–MAX6869 family delivers nanopower supervisory functionality for battery-critical applications, emphasizing ultra-low ICC, guaranteed low-VCC operation, and configurable reset behavior without external components.
FAQ
What is the exact reset threshold voltage of the MAX6855UK36D5+T?
The MAX6855UK36D5+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 MAX6855UK36D5+T uses this precise threshold to reliably detect brownout on 3.3V systems with margin.
Does the MAX6855UK36D5+T include a watchdog timer function?
No, the MAX6855UK36D5+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input; the MAX6855 is explicitly listed without WDI or watchdog capability. Its functionality is limited to voltage monitoring, manual reset, and fixed reset timeout - confirmed by absence of WDI pin and watchdog timing parameters in its electrical characteristics table.
What is the meaning of the "D5" in MAX6855UK36D5+T?
The "D5" suffix in MAX6855UK36D5+T specifies the reset timeout period option: 450ms minimum (with typical 600ms and maximum 1200ms). This is defined in Table 4 (Reset Timeout Periods) of the datasheet, where D5 maps to 300–600ms range. The timeout begins after VCC rises above 3.6V and MR is released, ensuring sufficient hold time for power rail stabilization before µP execution resumes.
Can the MAX6855UK36D5+T operate with VCC below 1.8V?
Yes, the MAX6855UK36D5+T operates with VCC as low as 1.2V and guarantees valid reset assertion down to 1.1V. Electrical Characteristics confirm supply voltage range of 1.2V to 5.5V, and the "Guaranteed Reset Valid to VCC = +1.1V" feature ensures deterministic behavior during deep brownout - critical for battery-powered devices nearing end-of-life voltage.
Is the MAX6855UK36D5+T pin-compatible with other MAX68xx supervisory ICs?
The MAX6855UK36D5+T shares the same 5-pin SOT23 package and pinout (RESET, GND, MR, GND, VCC) with MAX6854 and MAX6856, but differs from MAX6861–MAX6863 (which add CT pin) and MAX6864–MAX6869 (which replace second GND with WDI). Pin compatibility is confirmed in the Pin Configurations diagram and Selector Guide - making it a drop-in replacement for other MAX685x variants with matching reset polarity and timeout.
MAX6855UK36D5+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:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK36D5+T FAQ
1.How can I place an order for MAX6855UK36D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK36D5+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 MAX6855UK36D5+T reliable?
The price and inventory of MAX6855UK36D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK36D5+T is usually 5 days.
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Once your MAX6855UK36D5+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 MAX6855UK36D5+T?
For technical support, including MAX6855UK36D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK36D5+T requirements.
6.How does Aetrix verify that MAX6855UK36D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK36D5+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 MAX6855UK36D5+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK36D5+T?
All MAX6855UK36D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK36D5+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 MAX6855UK36D5+T part is unused and in its original packaging.
Return procedure for MAX6855UK36D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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