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Analog Devices Inc./Maxim Integrated MAX6855UK29D3
- Part No.:
- MAX6855UK29D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK29D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
MAX6855UK29D3 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 2.925V reset threshold. It asserts reset during VCC brownout, MR assertion, or watchdog timeout (not applicable to MAX6855), with guaranteed reset validity down to VCC = +1.1V and ultra-low 170nA typical supply current. It is used in battery-powered glucose monitors and portable medical devices requiring reliable power-on reset and low-quiescent-current supervision.
For engineers reviewing the MAX6855UK29D3 datasheet, MAX6855UK29D3 pinout, MAX6855UK29D3 application, or MAX6855UK29D3 equivalent, this page delivers verified functional identity, exact reset threshold and timeout values, confirmed pin roles, real-world use cases in portable healthcare electronics, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX6855UK29D3 implements a voltage-monitoring supervisory function with a precision bandgap reference and comparator-based reset generator. Its active-high push-pull RESET output is referenced to VCC and sinks or sources current without external components. The internal 10kΩ MR pullup enables direct switch-to-GND implementation with no external biasing.
It belongs to the MAX6854–MAX6869 family of nanopower supervisors but excludes watchdog timer and CT-selectable timeout features - confirmed by Selector Guide and Pin Description tables. Its fixed D3 reset timeout (150ms min / 225ms typ / 300ms max) and UK29 threshold suffix (2.925V) are factory-trimmed and non-configurable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V (factory-trimmed, ±2.5% tolerance); ensures reliable reset assertion when VCC drops below nominal 3.0V rail in portable systems. |
| Reset Timeout Period | 150ms minimum (D3 option); guarantees µP remains held in reset long enough for stable power-up sequencing. |
| Supply Current | 170nA typical at +25°C; enables multi-year battery life in always-on patient monitors and pagers. |
| Reset Output Type | Active-high push-pull; drives high to µP's active-high reset pin directly, eliminating need for external pullup or level-shifting. |
| Operating Voltage Range | 1.2V to 5.5V; supports supervision of 1.8V, 2.5V, 3.0V, and 3.3V logic rails with valid reset down to VCC = 1.1V. |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC; allows momentary switch-to-GND interface without external resistors or debounce circuitry. |
| Package | 5-pin SOT23; footprint-compatible with space-constrained handheld medical and consumer devices. |
Pinout & Package
Package: 5-pin SOT23 (lead-free or leaded, -40°C to +85°C operating range).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output that drives high during reset assertion; referenced to VCC and capable of sourcing ≥500µA at VOH ≥ 0.8×VCC. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane for accurate threshold monitoring. |
| 3 | MR (manual reset) | Active-low input with internal 10kΩ pullup; asserting low initiates reset and holds it for full timeout period after release. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity and thermal dissipation in high-density layouts. |
| 5 | VCC | Supply input monitored for brownout detection; requires 0.1µF bypass capacitor to GND for transient immunity per datasheet recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery operation in always-on wearable health monitors. |
| Guaranteed reset validity to VCC = +1.1V | Ensures deterministic reset behavior even during deep brownout conditions before system power collapse. |
| No external components required | Eliminates BOM cost and layout area for pullups, capacitors, or bias resistors - simplifies design and improves reliability. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive, preventing spurious resets in noisy DC-DC converter environments. |
| Factory-trimmed precision threshold | ±2.5% tolerance over temperature avoids calibration overhead and supports tight-margin 3.0V rail supervision. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous glucose sensing patch with coin-cell battery and low-power MCU. IC Role / Device Role / Timing Role: Supervises 2.8V LDO output to ensure clean MCU reset on power-up and brownout recovery. Use Value: 170nA ICC extends battery life beyond 2 years; 2.925V threshold matches nominal sensor rail; active-high RESET interfaces directly with MCU's nRST pin. |
Use Scenario: Portable ECG recorder with Bluetooth LE and rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and provides manual reset via front-panel button. Use Value: Internal MR pullup eliminates external resistor; 150ms timeout satisfies ARM Cortex-M boot timing requirements; SOT23 footprint fits compact PCB. |
| MP3 Players | Smart Pagers |
|
Use Scenario: Flash-based audio player powered by single AAA cell with boost converter. IC Role / Device Role / Timing Role: Supervises 3.0V boosted rail and asserts reset if voltage sags during headphone driver activation. Use Value: Immunity to 40µs VCC transients prevents false resets during high-current audio bursts; push-pull RESET drives MCU without level shifter. |
Use Scenario: Two-way pager with RF transceiver and low-power display controller. IC Role / Device Role / Timing Role: Provides fail-safe reset during cold start and user-initiated reboot via tactile switch. Use Value: MR pin accepts direct switch connection; 2.925V threshold aligns with 3.0V nominal supply; 5-pin SOT23 enables 0402-sized layout integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K29 | 2.93V reset threshold (±0.5%), 200ms fixed timeout, 1.6µA ICC - higher quiescent current than MAX6855UK29D3's 170nA. | Designed for industrial-grade temperature range (–40°C to +125°C); less suitable for ultra-low-power portable medical use. | Select when extended temperature rating outweighs battery-life impact; not drop-in due to 10× higher ICC. |
| MAX6326UR29 | 2.93V threshold (±2.5%), 140ms timeout, 800nA ICC - 4.7× higher supply current than MAX6855UK29D3. | Lacks manual reset input (MR); only voltage-monitoring function - cannot support front-panel reset buttons. | Choose only if MR functionality is unnecessary and higher ICC is acceptable; pinout differs (SOT23-4 vs SOT23-5). |
Compared with TPS3837K29 and MAX6326UR29, the MAX6855UK29D3 uniquely combines sub-µA ICC, integrated MR, and active-high push-pull output in a 5-pin SOT23 - making it optimal for space- and energy-constrained portable healthcare and consumer electronics where every nanoamp and millimeter matters.
Availability
MAX6855UK29D3 is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and smart pagers requiring stable component supply with guaranteed long-term availability and consistent parametric performance across production lots.
Supply support for MAX6855UK29D3 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 demanding environments.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable medical and consumer electronics, prioritizing nanoscale current draw and robust reset timing integrity.
FAQ
What is the exact reset threshold voltage of the MAX6855UK29D3?
The MAX6855UK29D3 has a factory-trimmed reset threshold voltage 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 per Table 2 (Threshold Suffix Guide) and is confirmed in the Electrical Characteristics table under VTH parameter. The MAX6855UK29D3 maintains this precise threshold without external calibration.
Does the MAX6855UK29D3 include a watchdog timer function?
No, the MAX6855UK29D3 does not include a watchdog timer. Per the Selector Guide and Pin Configurations section, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout capability. The MAX6855UK29D3 is a voltage-monitoring + manual reset supervisor only - its functional block diagram omits watchdog circuitry, and Pin 1 is designated RESET, not WDI.
What is the reset timeout period for the MAX6855UK29D3, and how is it set?
The MAX6855UK29D3 has a fixed reset timeout period of 150ms minimum (225ms typical, 300ms maximum), determined by the "D3" suffix per Table 4. This timeout is factory-programmed and non-adjustable - unlike MAX6861–MAX6863, it lacks a CT pin for selection. The timeout begins when VCC rises above the 2.925V threshold and MR is deasserted, ensuring sufficient hold time for µP initialization.
What type of reset output does the MAX6855UK29D3 provide, and how is it connected?
The MAX6855UK29D3 provides an active-high push-pull reset output on Pin 1. It drives high during reset assertion and low when deasserted, referenced to VCC. No external pullup is needed. To interface with an MCU's active-high reset pin, connect Pin 1 directly - the output sources ≥500µA at VOH ≥ 0.8×VCC (per Electrical Characteristics), satisfying standard CMOS input requirements without level-shifting circuitry.
Can the MAX6855UK29D3 operate reliably at very low supply voltages?
Yes, the MAX6855UK29D3 guarantees valid reset operation down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, RESET output behavior is not characterized. This ensures deterministic reset assertion during deep brownout events common in battery-powered systems nearing end-of-life, where other supervisors may fail to assert reset correctly.
MAX6855UK29D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK29D3 FAQ
1.How can I place an order for MAX6855UK29D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK29D3 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 MAX6855UK29D3 reliable?
The price and inventory of MAX6855UK29D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK29D3 is usually 5 days.
3.What payment methods are accepted for MAX6855UK29D3?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK29D3?
MAX6855UK29D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK29D3 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 MAX6855UK29D3?
For technical support, including MAX6855UK29D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK29D3 requirements.
6.How does Aetrix verify that MAX6855UK29D3 is sourced from the original manufacturer or authorized distributors?
All MAX6855UK29D3 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 MAX6855UK29D3 meets industry standards.
7.What is the process for return or replacement of MAX6855UK29D3?
All MAX6855UK29D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK29D3, 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 MAX6855UK29D3 part is unused and in its original packaging.
Return procedure for MAX6855UK29D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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