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Analog Devices Inc./Maxim Integrated MAX6837FXSD0+
- Part No.:
- MAX6837FXSD0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6837FXSD0+.pdf
- Description:
- MAX6837 ULTRA-LOW-VOLTAGE VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:907
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Product details
Overview
MAX6837FXSD0+ from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with open-drain active-low reset output, 1.05V factory-set reset threshold, and 1.5ms reset timeout period. It monitors +1.2V to +1.8V supplies in portable and battery-powered systems, asserting reset during brownout or manual reset events while consuming only 7.5µA typical supply current.
For engineers reviewing the MAX6837FXSD0+ datasheet, MAX6837FXSD0+ pinout, MAX6837FXSD0+ application, or MAX6837FXSD0+ equivalent, key selection criteria include its SC70-4 package, debounced MR input, ±2.5% threshold accuracy over temperature, and compatibility with bidirectional µP reset pins via open-drain configuration.
Technical Context
The MAX6837FXSD0+ implements a precision voltage comparator with 444mV internal reference, monitoring VCC directly to generate reset when supply falls below 1.05V. Its reset assertion includes a fixed 1.5ms timeout after VCC recovery, and it features a debounced manual reset (MR) input with internal 20kΩ pullup.
This device uses BiCMOS process technology (681 transistors), supports operation down to VCC = 0.55V with guaranteed RESET validity, and rejects fast negative VCC transients up to 100ns duration. The open-drain RESET output requires an external pullup and can interface with higher-voltage logic domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.05V ±2.5% - precisely matches 1.0V–1.1V supply rails; enables reliable brownout detection for low-voltage SoCs |
| Reset Timeout Period | 1.5ms - ensures sufficient hold time for µP initialization without excessive system delay |
| Supply Current | 7.5µA typ at 1.2V - minimizes quiescent drain in always-on battery-backed monitoring circuits |
| VCC Operating Range | 0.55V to 3.6V - guarantees functional reset assertion even during deep brownout conditions |
| MR Input | Debounced, internal 20kΩ pullup - eliminates need for external RC debounce; supports direct switch-to-ground connection |
| RESET Output Type | Open-drain active-low - enables wired-OR reset bus and level-shifting across multiple supply domains |
| Threshold Accuracy | ±2.5% over -40°C to +85°C - ensures consistent trip point across industrial temperature range without calibration |
Pinout & Package
MAX6837FXSD0+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs. Pin 1 = GND, Pin 2 = RESET (open-drain active-low), Pin 3 = MR (debounced manual reset), Pin 4 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and MR pullup; must be low-impedance for noise immunity |
| 2 (RESET) | Open-drain active-low reset output | Sinks current when asserted; requires external pullup to define high state voltage (up to 6V) |
| 3 (MR) | Active-low manual reset input | Internally pulled up to VCC; falling edge initiates reset with built-in glitch rejection (100ns) |
| 4 (VCC) | Supply and monitored voltage input | Power source and primary voltage sense node; valid operation supported down to 0.55V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.05V threshold | Eliminates external resistor divider; reduces BOM count and layout area for 1.0V–1.1V core supplies |
| 1.5ms fixed reset timeout | Guarantees µP reset hold time meets ARM Cortex-M and RISC-V boot requirements without timing margin uncertainty |
| Debounced MR input | Removes need for external RC network or firmware debounce logic; simplifies pushbutton integration |
| Open-drain RESET with 0.2V VOL @ 200µA | Enables direct interfacing with bidirectional µP reset pins and multi-rail reset buses |
| 7.5µA supply current | Extends battery life in coin-cell–powered IoT sensors and wearables by minimizing standby power |
Applications
| Battery-Powered Wearables | Low-Voltage Microcontroller Systems |
|---|---|
|
Use Scenario: A fitness tracker powered by a 1.2V Li-SOCl₂ cell experiences voltage sag during RF transmission bursts. IC Role / Device Role / Timing Role: MAX6837FXSD0+ continuously monitors VCC and asserts open-drain RESET within 60µs of crossing 1.05V threshold, holding reset for 1.5ms after recovery. Use Value: Prevents corrupted flash writes and CPU lockup during transient brownout, ensuring data integrity without external supervision logic. |
Use Scenario: An industrial sensor node uses a 1.3V core supply derived from a DC/DC converter with ±5% tolerance. IC Role / Device Role / Timing Role: MAX6837FXSD0+ serves as primary power-on reset generator and brownout detector, with MR tied to a maintenance button. Use Value: Provides deterministic reset timing and ±2.5% threshold accuracy-tighter than converter tolerance-ensuring robust startup under worst-case voltage conditions. |
| Portable Medical Devices | Energy-Harvesting Edge Nodes |
|
Use Scenario: A handheld glucose meter operates from a single 1.5V alkaline cell whose voltage declines from 1.6V to 0.9V over service life. IC Role / Device Role / Timing Role: MAX6837FXSD0+ detects drop below 1.05V and asserts RESET to halt measurement sequence before ADC reference becomes unstable. Use Value: Avoids false readings caused by marginal supply; guaranteed RESET validity down to VCC = 0.55V ensures clean shutdown signaling. |
Use Scenario: A solar-harvested environmental monitor powers up intermittently as capacitor voltage crosses operational threshold. IC Role / Device Role / Timing Role: MAX6837FXSD0+ provides first-cycle power-on reset and monitors VCC during intermittent operation, with MR used for forced wake-up reset. Use Value: Enables reliable cold-start sequencing using only 7.5µA quiescent current-critical for sub-µW energy budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6381XR22D3+ | Higher 2.2V reset threshold; 210ms timeout; SC70-3 package; no MR input | Designed for 2.5V/3.3V I/O rail monitoring-not suitable for sub-1.2V core supplies | Select when monitoring higher-voltage rails without manual reset requirement |
| TPS3123E10DBVR | 1.0V threshold; 200ms timeout; SOT-23-5; push-pull active-low RESET; no MR debounce | Requires external RC on MR; lacks guaranteed RESET validity below 0.8V VCC | Choose for cost-sensitive designs where longer timeout and simpler pinout outweigh debounce and deep-brownout needs |
Compared with MAX6837FXSD0+, MAX6381XR22D3+ targets higher-supply systems and omits manual reset, while TPS3123E10DBVR trades debounce and ultra-low-VCC operation for lower cost and wider timeout flexibility-making MAX6837FXSD0+ optimal for 1.0V–1.1V core monitoring with robust human-interface support.
Availability
MAX6837FXSD0+ is available at Aetrix Electronics and suitable for battery-powered wearables, low-voltage microcontroller systems, portable medical devices, energy-harvesting edge nodes, and industrial sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for MAX6837FXSD0+ 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, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX6832–MAX6840 family delivers ultra-low-voltage supervisory functions specifically for sub-1.8V digital systems, emphasizing minimal quiescent current, tight threshold accuracy, and compact SC70 packaging for portable and energy-constrained designs.
FAQ
What is the exact reset threshold voltage of the MAX6837FXSD0+?
The MAX6837FXSD0+ has a factory-set reset threshold of 1.05V with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix F, and applies directly to the MAX6837FXSD0+ without external adjustment.
Does the MAX6837FXSD0+ include manual reset debouncing?
Yes, the MAX6837FXSD0+ features a fully debounced manual reset (MR) input with built-in 100ns glitch rejection and internal 20kΩ pullup to VCC. This eliminates the need for external RC filtering, allowing direct connection of a momentary switch from MR to ground-verified in the Pin Description and Applications Information sections.
What is the function of the RESET pin on the MAX6837FXSD0+?
The RESET pin on the MAX6837FXSD0+ is an open-drain active-low output. When asserted, it sinks current to pull the line low; when deasserted, it presents high impedance and requires an external pullup resistor. This configuration enables wired-OR reset buses and level shifting-explicitly documented in the Pin Description and Functional Diagrams.
What timeout period is implemented in the MAX6837FXSD0+?
The MAX6837FXSD0+ implements a 1.5ms reset active timeout period, corresponding to the D1 suffix in the Active Timeout Period Guide. This fixed delay ensures the reset signal remains asserted for sufficient duration after VCC recovery to meet µP initialization requirements, as specified in Table 2 and Electrical Characteristics.
Can the MAX6837FXSD0+ operate reliably below 1.0V VCC?
Yes, the MAX6837FXSD0+ guarantees functional reset assertion down to VCC = 0.55V, with valid open-drain RESET output behavior confirmed at that level. Its design supports deep brownout detection and clean shutdown signaling in ultra-low-voltage systems-stated in Absolute Maximum Ratings and Ensuring a Valid Reset Output sections.
MAX6837FXSD0+ 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:
- 1.05V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 70µs Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6837FXSD0+ FAQ
1.How can I place an order for MAX6837FXSD0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6837FXSD0+ 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 MAX6837FXSD0+ reliable?
The price and inventory of MAX6837FXSD0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6837FXSD0+ is usually 5 days.
3.What payment methods are accepted for MAX6837FXSD0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6837FXSD0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6837FXSD0+?
MAX6837FXSD0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6837FXSD0+ 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 MAX6837FXSD0+?
For technical support, including MAX6837FXSD0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6837FXSD0+ requirements.
6.How does Aetrix verify that MAX6837FXSD0+ is sourced from the original manufacturer or authorized distributors?
All MAX6837FXSD0+ 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 MAX6837FXSD0+ meets industry standards.
7.What is the process for return or replacement of MAX6837FXSD0+?
All MAX6837FXSD0+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6837FXSD0+, 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 MAX6837FXSD0+ part is unused and in its original packaging.
Return procedure for MAX6837FXSD0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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