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Analog Devices Inc./Maxim Integrated MAX6837VXSD3+
- Part No.:
- MAX6837VXSD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6837VXSD3+.pdf
- Description:
- MAX6837 ULTRA-LOW-VOLTAGE VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:882
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Product details
Overview
MAX6837VXSD3+ from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with open-drain active-low reset output, 1.575V factory-set reset threshold, and 210ms reset timeout period. It monitors +1.2V to +1.8V supply rails in portable and battery-powered systems, asserting RESET when VCC falls below threshold or MR is pulled low. Designed for critical µP power monitoring in space-constrained applications.
For engineers reviewing the MAX6837VXSD3+ datasheet, MAX6837VXSD3+ pinout, MAX6837VXSD3+ application, or MAX6837VXSD3+ equivalent, key selection considerations include its SC70-4 open-drain RESET interface, debounced manual reset input (MR), ±2.5% threshold accuracy over temperature, and guaranteed reset validity down to VCC = 0.55V.
Technical Context
The MAX6837VXSD3+ implements a precision voltage comparator with hysteresis (0.75% of VTH) and internal 20kΩ MR pullup, enabling reliable brownout detection without external components. Its reset logic holds RESET asserted for exactly 210ms after VCC rises above 1.575V or MR returns high.
This variant belongs to the MAX6834–MAX6840 subgroup featuring open-drain RESET outputs requiring external pullup, debounced MR inputs, and operation across -40°C to +85°C. It draws only 7.5µA typical supply current at 1.2V, supporting long battery life in portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±2.5% - precisely matches 1.6V nominal core supplies with guaranteed accuracy over full temperature range |
| Reset Timeout Period | 210ms - ensures µP completes full power-up initialization before release, compatible with standard boot sequences |
| Supply Current | 7.5µA (typ) at 1.2V - enables multi-year operation on coin-cell batteries in always-on monitoring circuits |
| Operating Voltage Range | +0.55V to +3.6V - supports valid reset assertion even during deep brownout conditions down to 0.55V VCC |
| MR Input | Debounced, internal 20kΩ pullup - eliminates need for external RC debounce network; accepts CMOS-level signals |
| RESET Output Type | Open-drain active-low - allows level-shifting to higher-voltage logic domains and direct interfacing with bidirectional µP reset pins |
| Package | SC70-4 - 1.3mm × 1.6mm footprint ideal for wearables, sensor nodes, and compact embedded modules |
Pinout & Package
MAX6837VXSD3+ is housed in a 4-pin SC70 package (1.3mm × 1.6mm, 0.5mm pitch), optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be low-impedance connection to system ground plane |
| 2 | RESET | Open-drain active-low reset output; requires external pullup resistor (typically 10–100kΩ) to target logic rail |
| 3 | MR | Active-low manual reset input with internal 20kΩ pullup to VCC; driven low to force reset independent of VCC condition |
| 4 | VCC | Supply voltage input and monitored rail; powers device and sets reference for reset threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.575V threshold | Eliminates external resistor divider calibration; ensures consistent reset point across production batches and temperature |
| 210ms fixed timeout | Guarantees sufficient hold time for slow-ramping power supplies and complex µP initialization sequences |
| 7.5µA supply current | Reduces quiescent power in always-on monitoring paths, extending battery life in portable medical and IoT devices |
| Debounced MR input | Rejects mechanical switch bounce and EMI transients up to 100ns, removing need for external filtering components |
| Open-drain RESET with 0.2V VOL | Ensures clean logic-low assertion into high-capacitance reset buses; supports mixed-voltage system interfacing |
Applications
| Battery-Powered Wearables | Industrial Sensor Nodes |
|---|---|
|
Use Scenario: Compact fitness tracker operating from single Li-ion cell with dynamic voltage scaling between 1.2V and 1.8V core supply. IC Role / Device Role / Timing Role: Monitors core voltage during sleep/wake transitions and asserts open-drain RESET to prevent firmware corruption during brownout. Use Value: 7.5µA quiescent current extends battery life beyond 12 months; 210ms timeout accommodates variable power-rail ramp times. |
Use Scenario: Wireless temperature sensor node deployed in remote industrial environments with wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Provides deterministic reset initiation when 1.5V LDO output dips due to load transients or cold-temperature startup. Use Value: ±2.5% threshold accuracy ensures reliable reset across full operating range; SC70-4 package fits within 3mm² board area budget. |
| Medical Diagnostic Handhelds | Low-Power Edge AI Modules |
|
Use Scenario: Portable ECG monitor using ARM Cortex-M4 with 1.6V core supply, requiring fail-safe boot integrity after battery insertion. IC Role / Device Role / Timing Role: Generates clean, glitch-immune reset pulse during initial power-up and detects short negative VCC transients during ESD events. Use Value: Immunity to 100ns VCC glitches prevents spurious resets; 1.575V threshold aligns precisely with 1.6V nominal supply tolerance band. |
Use Scenario: TinyML inference module powered by energy-harvesting source with unstable 1.2–1.5V output feeding FPGA fabric and microcontroller. IC Role / Device Role / Timing Role: Supervises harvested supply rail and coordinates synchronized reset of both FPGA configuration logic and application processor via shared open-drain bus. Use Value: Open-drain output enables wired-OR reset arbitration with other supervisors; 0.55V minimum VCC operation covers full harvest voltage range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6837VXSD1+ | Same package and pinout, but 1.5ms reset timeout instead of 210ms | Suitable for faster-boot µPs where shorter reset hold time is acceptable | Select when system boot sequence completes in <2ms and lower timing margin is acceptable |
| MAX6834VXRD3+ | 3-pin SC70-3 package, no MR input, same 1.575V threshold and 210ms timeout | Used where manual reset functionality is unnecessary and board space is extremely constrained | Choose when MR is unused and footprint reduction to 1.2mm × 1.2mm is critical |
Compared with MAX6837VXSD3+, the MAX6837VXSD1+ offers tighter timing control for rapid-boot systems, while the MAX6834VXRD3+ sacrifices manual reset capability to achieve minimal 3-pin footprint-both retain identical threshold accuracy and open-drain interface behavior.
Availability
MAX6837VXSD3+ is available at Aetrix Electronics and suitable for battery-powered wearables, industrial sensor nodes, and medical diagnostic handhelds requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6837VXSD3+ 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 demanding industrial, automotive, and computing applications.
The MAX6832–MAX6840 family was engineered specifically for ultra-low-voltage microprocessor supervision in portable and energy-constrained systems, emphasizing minimal quiescent current, small footprint, and robust brownout immunity.
FAQ
What is the exact reset threshold voltage of the MAX6837VXSD3+ and how accurate is it over temperature?
The MAX6837VXSD3+ has a factory-set reset threshold of 1.575V with ±2.5% accuracy over the full -40°C to +85°C operating range. This specification is guaranteed by design and tested across temperature, ensuring reliable detection of brownout conditions in 1.6V nominal supply systems without external calibration.
Does the MAX6837VXSD3+ require an external pullup resistor on its RESET pin, and what value is recommended?
Yes, the MAX6837VXSD3+ features an open-drain active-low RESET output and requires an external pullup resistor. A value between 10kΩ and 100kΩ is recommended, selected based on rise time requirements and target logic rail voltage. For 3.3V systems, 47kΩ provides optimal noise immunity and speed balance.
How does the manual reset (MR) input on the MAX6837VXSD3+ behave during power-up and in noisy environments?
The MR input on the MAX6837VXSD3+ includes internal debounce and a 20kΩ pullup to VCC. It remains functional down to VCC = 0.55V, rejects transients ≤100ns, and requires only a 2µs minimum pulse width. In noisy environments, adding a 0.1µF capacitor from MR to GND enhances immunity without affecting reset timing.
Can the MAX6837VXSD3+ monitor supply voltages below 1.2V, and what is its minimum operational VCC?
No-the MAX6837VXSD3+ is designed for 1.2V to 1.8V nominal supplies and guarantees reset functionality only down to VCC = 0.55V. While it may operate at lower voltages, the 1.575V threshold and internal circuitry are characterized and specified for use with ≥1.2V supplies per the datasheet's operating conditions.
What is the purpose of the 210ms reset timeout period in the MAX6837VXSD3+, and how is it implemented?
The 210ms reset timeout in the MAX6837VXSD3+ ensures the microprocessor remains held in reset long enough to complete full power-rail stabilization and internal initialization. It is implemented via an internal precision timer that starts upon VCC crossing the 1.575V threshold or MR release, providing fixed, temperature-stable delay without external components.
MAX6837VXSD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6837VXSD3+ FAQ
1.How can I place an order for MAX6837VXSD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6837VXSD3+ 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 MAX6837VXSD3+ reliable?
The price and inventory of MAX6837VXSD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6837VXSD3+ is usually 5 days.
3.What payment methods are accepted for MAX6837VXSD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6837VXSD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6837VXSD3+?
MAX6837VXSD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6837VXSD3+ 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 MAX6837VXSD3+?
For technical support, including MAX6837VXSD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6837VXSD3+ requirements.
6.How does Aetrix verify that MAX6837VXSD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6837VXSD3+ 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 MAX6837VXSD3+ meets industry standards.
7.What is the process for return or replacement of MAX6837VXSD3+?
All MAX6837VXSD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6837VXSD3+, 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 MAX6837VXSD3+ part is unused and in its original packaging.
Return procedure for MAX6837VXSD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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