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Analog Devices Inc./Maxim Integrated MAX6854UK31D3+
- Part No.:
- MAX6854UK31D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6854UK31D3+.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,666
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Product details
Overview
The MAX6854UK31D3+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.075V reset threshold (suffix "31"), and 150ms minimum reset timeout (suffix "D3"). It monitors VCC, provides manual reset via active-low MR input, and asserts an open-drain active-low RESET output-designed for reliable power-up/brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6854UK31D3+ datasheet, MAX6854UK31D3+ pinout, MAX6854UK31D3+ application, or MAX6854UK31D3+ equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), no external components requirement, and compatibility with low-voltage µP systems operating from 1.2V to 5.5V.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and reset timing control in a single BiCMOS IC. Its internal 10kΩ MR pullup eliminates external biasing, and the open-drain RESET output supports flexible logic-level interfacing up to 5.5V with an external pullup resistor.
The reset assertion mechanism responds to VCC falling below 3.075V ±2.5%, MR low pulse ≥1µs, or watchdog timeout (not applicable to MAX6854). After recovery, RESET remains asserted for ≥150ms, with VCC-to-reset delay <40µs and MR-to-reset delay <250ns-ensuring robust glitch rejection and deterministic timing across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year battery life in always-on medical sensors. |
| Reset Threshold | 3.075V ±2.5%; precisely matches 3.3V system rails with built-in hysteresis (0.5% of VTH). |
| Reset Timeout | 150ms minimum; ensures µP completes power stabilization before release from reset. |
| Operating Voltage | 1.2V to 5.5V; supports Li-ion, coin-cell, and regulated 1.8V/2.5V/3.3V domains. |
| Reset Validity | Guaranteed to VCC = +1.1V; maintains valid logic state during deep brownout conditions. |
| MR Input | Active-low, internally pulled up to VCC via 10kΩ; accepts CMOS levels, no external resistor needed. |
| RESET Output | Open-drain active-low; requires external pullup, compatible with 0–5.5V logic families. |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant) variant denoted by "+" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; sinks current when asserted, requires external pullup for logic-high state. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; <1µs pulse width sufficient to trigger reset. |
| 4 | GND | Second ground terminal; electrically tied to Pin 2 internally; improves noise immunity in high-EMI environments. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year operation on CR2032 coin cell in glucose monitors. |
| No external components | Eliminates BOM cost and board space for pullups, capacitors, or resistors beyond 0.1µF VCC bypass. |
| VCC transient immunity | Withstands ≤40µs VCC glitches at 100mV overdrive-critical for noisy switch-mode power supply environments. |
| Guaranteed reset at low VCC | Valid RESET assertion down to 1.1V ensures fail-safe behavior even during severe brownout events. |
| SOT23-5 footprint | Standardized 5-pin package enables drop-in replacement and automated assembly compatibility. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing in wearable patch pumps requiring multi-year battery life and fail-safe power sequencing. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end and 3.3V MCU supply; asserts RESET until both rails stabilize post-battery insertion. Use Value: Prevents erroneous sensor readings or insulin dosing during power-up transients using 150ms timeout and 3.075V threshold matched to 3.3V LDO output. |
Use Scenario: Portable ECG/SpO₂ devices powered by single-cell Li-ion with dynamic load switching causing VCC droop. IC Role / Device Role / Timing Role: Monitors main 3.3V rail; detects brownout events below 3.075V and holds MCU in reset for ≥150ms to prevent corrupted memory writes. Use Value: Guarantees reset validity down to 1.1V, ensuring safe shutdown even during deep discharge states where other supervisors fail. |
| MP3 Players | PDAs |
Use Scenario: Flash-based audio players with cold-start from depleted batteries and frequent USB charging cycles. IC Role / Device Role / Timing Role: Provides manual reset via physical button (MR pin) and automatic reset on VCC ramp; open-drain RESET interfaces to 1.2V core logic. Use Value: 170nA quiescent current extends standby time; MR internal 10kΩ pullup removes need for external bias, simplifying PCB layout. |
Use Scenario: Handheld PDAs with dual-rail power (1.8V core, 3.3V I/O) and real-time clock backup circuits. IC Role / Device Role / Timing Role: Supervises primary 3.3V supply; RESET output drives enable pins of voltage translators and level shifters during power transitions. Use Value: Open-drain output allows direct connection to 5V-tolerant I/O buffers without level-shifting components, reducing component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.08V reset threshold, 200ms timeout, push-pull active-low RESET, 1.6µA ICC | Higher supply current limits use in ultra-low-power medical wearables; lacks open-drain flexibility | Select when push-pull drive and tighter threshold tolerance (±0.5%) are required over nanopower operation |
| STM6315SW33F6F | 3.08V threshold, 140ms timeout, open-drain RESET, 400nA ICC, -40°C to +125°C rating | Wider temperature range suits industrial handhelds; slightly higher ICC reduces battery lifetime vs. MAX6854UK31D3+ | Choose for extended temperature operation where 170nA ICC is secondary to thermal robustness |
Compared with TPS3836K33DBVR and STM6315SW33F6F, the MAX6854UK31D3+ delivers the lowest ICC (170nA), precise 3.075V threshold matching common 3.3V LDOs, and open-drain output for universal logic interfacing-making it optimal for space-constrained, battery-critical medical and portable designs.
Availability
MAX6854UK31D3+ is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and PDAs requiring stable component supply with long-term lifecycle support and RoHS-compliant packaging.
Supply support for MAX6854UK31D3+ 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854 series belongs to Maxim's nanopower supervisory product line, engineered specifically for ultra-low-power, battery-operated systems where reset reliability and minimal current draw are critical design constraints.
FAQ
What is the exact reset threshold voltage of the MAX6854UK31D3+?
The MAX6854UK31D3+ has a factory-trimmed reset threshold of 3.075V, with ±2.5% tolerance over temperature (-40°C to +85°C). This value is defined by the "31" suffix per Maxim's Threshold Suffix Guide (Table 2), and is validated across the full operating range-not just at +25°C.
Does the MAX6854UK31D3+ include a watchdog timer function?
No, the MAX6854UK31D3+ does not include a watchdog timer. It is part of the MAX6854/MAX6855/MAX6856 family, which provides only voltage monitoring and manual reset. Watchdog functionality is exclusive to MAX6864–MAX6869 variants, as confirmed in the Selector Guide and Pin Configurations section.
What is the function of Pin 4 on the MAX6854UK31D3+?
Pin 4 on the MAX6854UK31D3+ is a second ground terminal (GND), electrically connected to Pin 2 internally. Its inclusion improves noise immunity and thermal performance in high-density layouts, and must be soldered to the system ground plane-per the Typical Operating Circuit and Pin Configuration diagrams.
Can the MAX6854UK31D3+ operate with a 1.2V supply?
Yes, the MAX6854UK31D3+ operates from 1.2V to 5.5V. Its supply current remains ultra-low (170nA typ at 1.8V), and reset assertion is guaranteed down to VCC = +1.1V-enabling reliable supervision of sub-1.8V logic domains such as modern ultra-low-power MCUs and analog sensors.
What type of RESET output does the MAX6854UK31D3+ provide?
The MAX6854UK31D3+ provides an open-drain active-low RESET output (Pin 1), requiring an external pullup resistor. This configuration allows interfacing with logic supplies up to 5.5V independent of the monitored VCC rail-unlike push-pull variants-and is explicitly confirmed in the MAX6854/MAX6856 Pin Description table.
MAX6854UK31D3+ 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:
- 3.075V
- 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
MAX6854UK31D3+ FAQ
1.How can I place an order for MAX6854UK31D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6854UK31D3+ 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 MAX6854UK31D3+ reliable?
The price and inventory of MAX6854UK31D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6854UK31D3+ is usually 5 days.
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4.How is shipping managed for MAX6854UK31D3+?
MAX6854UK31D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6854UK31D3+ 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 MAX6854UK31D3+?
For technical support, including MAX6854UK31D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6854UK31D3+ requirements.
6.How does Aetrix verify that MAX6854UK31D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6854UK31D3+ 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 MAX6854UK31D3+ meets industry standards.
7.What is the process for return or replacement of MAX6854UK31D3+?
All MAX6854UK31D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6854UK31D3+, 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 MAX6854UK31D3+ part is unused and in its original packaging.
Return procedure for MAX6854UK31D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6854UK31D3+ Tags
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