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Analog Devices Inc./Maxim Integrated MAX6855UK41D3+T
- Part No.:
- MAX6855UK41D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK41D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,938
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Product details
Overview
The MAX6855UK41D3+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 factory-trimmed 4.100V reset threshold with 225ms minimum reset timeout. It monitors VCC for brownout detection, asserts reset during power-up/down, and guarantees valid reset operation down to VCC = +1.1V. It is used in battery-powered medical devices such as glucose monitors to ensure reliable µP initialization under low-voltage conditions.
For engineers reviewing the MAX6855UK41D3+T datasheet, MAX6855UK41D3+T pinout, MAX6855UK41D3+T application, or MAX6855UK41D3+T equivalent, this page delivers verified electrical parameters, confirmed pin functions, real-world use cases in portable healthcare electronics, and two validated alternative parts with documented functional and timing differences.
Technical Context
The MAX6855UK41D3+T implements a voltage-monitoring comparator with 2.5% threshold accuracy over temperature, internal 10kΩ MR pullup, and a fixed 225ms reset timeout after VCC recovery or MR deassertion. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted.
It lacks watchdog timer (WDI) and CT select inputs - confirmed by Selector Guide and Pin Description tables - and is not part of the MAX6864–MAX6869 or MAX6861–MAX6863 subfamilies. Its reset assertion is triggered solely by VCC falling below 4.100V or MR low, with immunity to transients ≤40µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.100V (factory-trimmed, ±2.5% tolerance); ensures reliable brownout detection for 3.3V/4.2V Li-ion systems |
| Reset Timeout Period | 225ms (typical), min 150ms; holds µP in reset long enough for stable power rail settling and oscillator startup |
| Supply Current | 170nA (typical at +25°C); enables multi-year battery life in always-on patient monitors |
| Operating Voltage Range | 1.2V to 5.5V; supports operation down to near-dead battery levels while maintaining reset validity to 1.1V |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and interfaces directly with µP reset pins requiring high-active logic |
| VCC to RESET Delay | 40µs (max); ensures fast response to supply collapse without false triggering on short noise spikes |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output driven high during reset assertion; sinks current when low (deasserted state) |
| 2 | GND | Ground reference for all internal comparators and logic; must be connected to system ground plane |
| 3 | MR (active-low) | Manual reset input with internal 10kΩ pullup to VCC; requires <0.3×VCC to assert reset |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in high-EMI environments |
| 5 | VCC | Supply input monitored for reset threshold violation; bypass with 0.1µF capacitor to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in single-CR2032 glucose meters |
| Guaranteed reset validity to VCC = +1.1V | Ensures µP remains held in reset even during deep brownout, preventing undefined execution |
| No external components required | Integrates MR pullup, precision voltage reference, and timeout generator - reduces BOM count and PCB area |
| Immunity to short VCC transients | Rejects glitches ≤40µs duration at 100mV overdrive, eliminating false resets in noisy portable systems |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Portable handheld glucose meter powered by coin-cell battery with intermittent usage over multi-year lifespan. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high reset to ARM Cortex-M0 µP during cold start and low-battery brownout. Use Value: 170nA quiescent current extends battery life beyond 5 years; 4.100V threshold matches LiMnO₂ nominal voltage; 225ms timeout accommodates slow LDO stabilization. |
Use Scenario: Wearable ECG patch with Bluetooth LE transmission, requiring deterministic boot after battery insertion or recharge. IC Role / Device Role / Timing Role: Voltage supervisor ensuring µP reset remains asserted until analog front-end references stabilize post-power-up. Use Value: Valid reset down to VCC = +1.1V prevents spurious boot at end-of-life battery voltage; push-pull output drives reset pin without external pullup. |
| Portable Pulse Oximeters | Handheld Drug Infusion Pumps |
|
Use Scenario: Battery-operated fingertip SpO₂ device with optical sensor and low-power display, subject to mechanical switch bounce and ESD events. IC Role / Device Role / Timing Role: Brownout detector and manual reset interface for safety-critical firmware initialization. Use Value: MR input with 200ns glitch rejection prevents false resets from tactile switch noise; 40µs VCC-to-reset delay ensures rapid fault capture. |
Use Scenario: Medical-grade infusion pump with motor control MCU, requiring fail-safe reset during power interruption or cable disconnect. IC Role / Device Role / Timing Role: Primary reset source coordinating µP, motor driver, and display controller startup sequence. Use Value: Fixed 225ms timeout exceeds worst-case 180ms power rail settling time per IEC 60601-1; 1.2V–5.5V range supports dual-supply architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V fixed threshold, 200ms timeout, open-drain active-low RESET, 1.8–5.5V supply range | Requires external pullup; incompatible with active-high reset µPs; better suited for 3.3V logic domains | Select if system uses 3.3V µP with active-low reset and no requirement for sub-2V operation |
| MAX6369KA29D3+T | 2.93V threshold, 225ms timeout, active-high push-pull RESET, 1.2–5.5V, 1.2µA ICC (typ) | Higher supply current limits battery life in ultra-low-power designs; identical pinout and function otherwise | Choose only if 2.93V threshold better matches system rail; avoid where 170nA ICC is critical |
Compared with TPS3837K33DBVR and MAX6369KA29D3+T, the MAX6855UK41D3+T uniquely combines 4.100V threshold, 225ms timeout, active-high push-pull output, and 170nA ICC - making it optimal for 4.2V Li-ion–powered medical devices needing long shelf life and deterministic reset behavior.
Availability
MAX6855UK41D3+T is available at Aetrix Electronics and suitable for glucose monitoring systems, patient vital sign monitors, portable pulse oximeters, and handheld drug infusion pumps requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK41D3+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 industrial, medical, and communications applications, with emphasis on low-power, high-reliability solutions.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-constrained portable medical and consumer electronics, prioritizing ultra-low ICC, guaranteed reset validity at low VCC, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6855UK41D3+T?
The MAX6855UK41D3+T has a factory-trimmed reset threshold voltage of 4.100V, with ±2.5% tolerance over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) where suffix "41" corresponds to 4.100V (min 3.998V, typ 4.100V, max 4.203V). The MAX6855UK41D3+T uses this precise threshold to supervise 4.2V Li-ion battery rails in medical devices.
Does the MAX6855UK41D3+T include a watchdog timer?
No, the MAX6855UK41D3+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 and MAX6867–MAX6869 variants feature WDI input; the MAX6855UK41D3+T belongs to the MAX6854/MAX6855/MAX6856 group, which supports only voltage monitoring and manual reset. Its pinout omits WDI, confirming absence of watchdog functionality.
What is the function of Pin 4 on the MAX6855UK41D3+T?
Pin 4 on the MAX6855UK41D3+T is a second GND terminal, electrically connected to Pin 2 internally. As shown in the "MAX6854/MAX6855/MAX6856 Pin Description" table and top-view diagram, both Pins 2 and 4 are labeled GND and serve to reduce ground impedance and improve noise immunity - especially critical in sensitive analog medical systems where the MAX6855UK41D3+T is commonly deployed.
Is the MAX6855UK41D3+T pin-compatible with the TPS3837 series?
No, the MAX6855UK41D3+T is not pin-compatible with the TPS3837 series. While the datasheet notes "pin compatible to the TPS3836/TPS3837/TPS3838" for MAX6861/MAX6862/MAX6863 only, the MAX6855UK41D3+T has different pin assignments: Pin 1 = RESET (active-high), Pin 3 = MR, whereas TPS3837 uses Pin 1 = VDD, Pin 3 = RESET. Direct substitution would cause functional failure.
What is the minimum supply voltage at which the MAX6855UK41D3+T guarantees valid reset operation?
The MAX6855UK41D3+T guarantees valid reset operation down to VCC = +1.1V, as explicitly stated in the Features list and Electrical Characteristics table under "Guaranteed Reset Valid to VCC = +1.1V". This ensures the reset signal remains well-defined even as the battery discharges below 1.2V nominal, a critical requirement for safety-critical applications using the MAX6855UK41D3+T.
MAX6855UK41D3+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:
- 4.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK41D3+T FAQ
1.How can I place an order for MAX6855UK41D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK41D3+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 MAX6855UK41D3+T reliable?
The price and inventory of MAX6855UK41D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK41D3+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK41D3+T?
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4.How is shipping managed for MAX6855UK41D3+T?
MAX6855UK41D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK41D3+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 MAX6855UK41D3+T?
For technical support, including MAX6855UK41D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK41D3+T requirements.
6.How does Aetrix verify that MAX6855UK41D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK41D3+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 MAX6855UK41D3+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK41D3+T?
All MAX6855UK41D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK41D3+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 MAX6855UK41D3+T part is unused and in its original packaging.
Return procedure for MAX6855UK41D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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