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Analog Devices Inc./Maxim Integrated MAX6855UK40D2+T
- Part No.:
- MAX6855UK40D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK40D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
The MAX6855UK40D2+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 4.000V reset threshold (±2.5%), and 40ms minimum reset timeout period. It provides active-high push-pull RESET output, manual reset input (MR), and operates across -40°C to +85°C for reliable power-up/brownout monitoring in battery-powered systems.
For engineers reviewing the MAX6855UK40D2+T datasheet, MAX6855UK40D2+T pinout, MAX6855UK40D2+T application, or MAX6855UK40D2+T equivalent, this device serves as a low-power voltage monitor with deterministic reset timing, MR-triggered recovery, and guaranteed RESET validity down to VCC = +1.1V - critical for portable medical and handheld electronics design validation.
Technical Context
The MAX6855UK40D2+T implements a precision bandgap-based voltage comparator with hysteresis (0.5% of VTH) to detect VCC falling below its 4.000V threshold. Its internal timer ensures RESET remains asserted for ≥40ms after VCC rises above threshold and MR deasserts, independent of supply slew rate.
This variant belongs to the MAX6854–MAX6869 family but excludes watchdog timer (WDI) and CT select functionality. It delivers active-high push-pull RESET referenced to VCC, with VOH ≥ 0.8×VCC at ISOURCE = 500µA and VOL ≤ 0.3V at ISINK = 1.2mA - enabling direct interface with 1.8V–5.5V µP reset inputs without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.000V ±2.5% - precisely monitors 3.3V/5V rails with brownout immunity |
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 40ms min - ensures µP completes power stabilization before release |
| Operating Range | -40°C to +85°C - qualified for industrial and portable medical environments |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor |
| VCC Validity Limit | RESET guaranteed valid down to VCC = +1.1V - supports deep brownout detection |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies momentary switch interface |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives high during reset assertion, referenced to VCC |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS logic |
| 4 | GND | Second ground terminal - must be connected to same potential as Pin 2 for noise immunity |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors |
| Reset threshold accuracy | ±2.5% over temperature ensures reliable 4.000V detection across full -40°C to +85°C range |
| No external components | Self-contained supervision - no capacitors, resistors, or trimming required for basic operation |
| Immunity to VCC transients | Rejects <40µs transients at 100mV overdrive - prevents false resets in noisy power environments |
| Guaranteed RESET validity | Functional RESET output down to VCC = +1.1V - supports ultra-low-voltage brownout detection |
Applications
| Portable Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V system rail and triggers controlled µP reset on brownout to preserve sensor calibration state. Use Value: 170nA ICC extends CR2032 battery life beyond 2 years; 40ms tRP ensures ADC and RF subsystems stabilize before firmware execution resumes. |
Use Scenario: Wearable ECG patch with intermittent data logging and wireless upload. IC Role / Device Role / Timing Role: Monitors 1.8V analog front-end supply and asserts active-high RESET to ARM Cortex-M0+ during power dips. Use Value: Push-pull RESET eliminates external pullup, reducing BOM count; VCC = +1.1V validity guarantees reset integrity even during deep discharge. |
| Industrial Handheld Scanners | Smart Energy Meters |
Use Scenario: Rugged barcode scanner operating from rechargeable Li-ion with frequent wake/sleep transitions. IC Role / Device Role / Timing Role: Provides deterministic reset timing on cold start and battery swap events using MR input. Use Value: 10kΩ internal MR pullup enables direct SPST switch connection; 4.000V threshold aligns with 3.3V LDO dropout margin. |
Use Scenario: DIN-rail mounted meter with isolated power supplies and tamper-detection circuitry. IC Role / Device Role / Timing Role: Supervises auxiliary 5V supply powering real-time clock and secure element. Use Value: ±2.5% VTH tolerance ensures compliance with IEC 62053-21 voltage monitoring requirements; SOT23 footprint minimizes PCB area. |
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 RESET; 1.6µA ICC | Higher supply current limits battery life; open-drain requires external pullup | Select when 3.3V rail supervision is primary requirement and board space allows pullup resistor |
| STM6315SW13F | 3.08V threshold; 140ms timeout; push-pull active-low RESET; 1.2µA ICC | Active-low output incompatible with µPs requiring active-high reset; higher ICC reduces runtime | Choose only if legacy design uses active-low reset and 3.08V threshold matches existing LDO |
Compared with MAX6855UK40D2+T, TPS3837K33DBVR offers longer timeout but consumes ~7× more current and lacks 4.000V precision; STM6315SW13F provides lower-cost supervision but sacrifices nanopower operation and exact 4.000V threshold alignment needed for 3.3V/5V dual-rail systems.
Availability
MAX6855UK40D2+T is available at Aetrix Electronics and suitable for portable medical devices, handheld instrumentation, battery-powered IoT sensors, and industrial control panels requiring stable component supply across extended product lifecycles.
Supply support for MAX6855UK40D2+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 connectivity in demanding environments.
The MAX6854–MAX6869 family targets ultra-low-power supervision in portable and medical electronics, where nanoscale ICC, guaranteed reset timing, and robust VCC transient immunity are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6855UK40D2+T?
The MAX6855UK40D2+T has a factory-trimmed reset threshold of 4.000V 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 "40" corresponds to 4.000V nominal. The MAX6855UK40D2+T maintains this specification without external calibration or trimming components.
Does the MAX6855UK40D2+T include a watchdog timer function?
No, the MAX6855UK40D2+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input. The MAX6855UK40D2+T is a manual-reset-only supervisory circuit with active-high push-pull RESET, MR input, and fixed 40ms timeout - identical in functionality to MAX6854/MAX6856 but with different reset polarity and threshold.
What is the minimum VCC voltage at which MAX6855UK40D2+T guarantees valid RESET output?
The MAX6855UK40D2+T guarantees RESET output validity down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions, unlike many supervisors that fail below 1.5V. The guarantee applies to both assertion and deassertion timing integrity.
Can the MAX6855UK40D2+T drive a microprocessor reset pin directly without external components?
Yes, the MAX6855UK40D2+T can drive a µP reset pin directly. Its active-high push-pull RESET output eliminates the need for an external pullup resistor, and it sources/sinks sufficient current (VOH ≥ 0.8×VCC at 500µA, VOL ≤ 0.3V at 1.2mA) to meet standard µP reset input thresholds across 1.8V–5.5V supply ranges. No additional passive components are required for basic operation.
What package type and lead finish does MAX6855UK40D2+T use?
The MAX6855UK40D2+T uses a 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix per Maxim's ordering convention. It is compatible with standard surface-mount reflow profiles and occupies minimal PCB area - critical for space-constrained portable designs. Pin 2 and Pin 4 are both GND terminals and must be connected to the same ground plane.
MAX6855UK40D2+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:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK40D2+T FAQ
1.How can I place an order for MAX6855UK40D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK40D2+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 MAX6855UK40D2+T reliable?
The price and inventory of MAX6855UK40D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK40D2+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK40D2+T?
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4.How is shipping managed for MAX6855UK40D2+T?
MAX6855UK40D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK40D2+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 MAX6855UK40D2+T?
For technical support, including MAX6855UK40D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK40D2+T requirements.
6.How does Aetrix verify that MAX6855UK40D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK40D2+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 MAX6855UK40D2+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK40D2+T?
All MAX6855UK40D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK40D2+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 MAX6855UK40D2+T part is unused and in its original packaging.
Return procedure for MAX6855UK40D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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