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Analog Devices Inc./Maxim Integrated MAX6837FXSD3
- Part No.:
- MAX6837FXSD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6837FXSD3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,973
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Product details
Overview
MAX6837FXSD3 from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with open-drain active-low reset output, factory-set 1.050V reset threshold (F suffix), and 210ms reset timeout period (D3 suffix), designed for reliable power monitoring in +1.2V to +1.8V digital systems. It features debounced manual reset input (MR), ±2.5% threshold accuracy over temperature, and operates down to VCC = 0.55V while consuming only 7.5µA typical supply current.
For engineers reviewing the MAX6837FXSD3 datasheet, MAX6837FXSD3 pinout, MAX6837FXSD3 application, or MAX6837FXSD3 equivalent, key selection considerations include its SC70-4 package, MR debounce capability, open-drain RESET requiring external pullup, immunity to short VCC transients, and compatibility with bidirectional µP reset pins in low-power embedded systems.
Technical Context
The MAX6837FXSD3 implements a precision voltage comparator with hysteresis (0.75% of VTH) to monitor VCC against a fixed 1.050V threshold, asserting reset when VCC falls below this level or when the debounced MR pin is pulled low. Reset remains asserted for a guaranteed 210ms timeout after VCC rises above threshold or MR is released.
Its open-drain RESET output supports level-shifting applications-pullup can be connected to any voltage up to 6V-and interfaces directly with bidirectional µP reset I/Os. The internal 20kΩ MR pullup eliminates external components, and the device ignores fast negative VCC transients ≤100ns at 10mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.050V ±2.5% over -40°C to +85°C - ensures accurate brownout detection for 1.2V systems |
| Reset Timeout Period | 210ms - provides sufficient hold time for µP initialization and clock stabilization |
| Supply Current | 7.5µA typical at 1.2V - enables multi-year battery life in portable equipment |
| VCC Operating Range | 0.55V to 3.6V - guarantees valid reset assertion even during deep power-down |
| MR Input Pulse Width | 2µs minimum - supports clean reset initiation from mechanical switches or logic signals |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level translation to higher voltage rails |
| Reset Hysteresis | 0.75% of VTH - prevents chatter during slow VCC recovery near threshold |
Pinout & Package
MAX6837FXSD3 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs. Pin 1 is GND, Pin 2 is RESET (open-drain active-low), Pin 3 is MR (debounced manual reset input), and Pin 4 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground for all internal comparators and reset logic |
| 2 | RESET | Open-drain active-low output requiring external pullup; sinks 200µA at VCC ≥1.5V |
| 3 | MR | Debounced active-low manual reset input with internal 20kΩ pullup to VCC |
| 4 | VCC | Supply and monitored voltage rail (0.55V–3.6V); powers internal circuitry and defines reset domain |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.050V threshold (F suffix) | Eliminates external resistor networks and calibration for 1.2V system monitoring |
| 210ms reset timeout (D3 suffix) | Meets JEDEC JESD78 requirements for µP reset hold time in industrial controllers |
| Debounced MR input | Removes need for external RC filtering or firmware debounce in handheld devices |
| Open-drain RESET with 6V-tolerant pullup | Enables reset signaling across voltage domains (e.g., 1.2V supervisor → 3.3V µP) |
| 7.5µA supply current | Reduces quiescent power by >90% versus legacy reset ICs, critical for coin-cell operation |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless sensor node powered by a CR2032 coin cell monitors temperature and transmits data every 5 minutes. IC Role / Device Role / Timing Role: MAX6837FXSD3 supervises the 1.2V LDO output powering the MCU and radio, asserting reset during battery voltage sag below 1.050V. Use Value: Its 7.5µA supply current extends battery life beyond 5 years; 210ms timeout ensures full MCU boot before radio activation. |
Use Scenario: An industrial PLC module uses isolated 1.2V logic for field-side I/O conditioning circuits. IC Role / Device Role / Timing Role: MAX6837FXSD3 monitors the isolated 1.2V rail and asserts open-drain RESET to the main controller via optocoupler-coupled interface. Use Value: Open-drain output allows safe level translation across isolation barrier; ±2.5% threshold ensures consistent trip point despite ambient temperature swings. |
| Medical Wearable ECG Monitor | Automotive Body Control Module (BCM) Subsystem |
Use Scenario: A wearable ECG patch uses a 1.2V core supply derived from a rechargeable Li-ion cell with tight voltage regulation. IC Role / Device Role / Timing Role: MAX6837FXSD3 provides fail-safe reset to the analog front-end and BLE SoC during brownout events caused by high-current pulse discharge. Use Value: Immunity to 100ns VCC glitches prevents spurious resets during RF transmission bursts; 0.55V VCC operation maintains reset validity through deep discharge. |
Use Scenario: A BCM subsystem powers auxiliary functions (window lift, mirror control) from a 1.2V buck converter fed by the vehicle's 12V battery. IC Role / Device Role / Timing Role: MAX6837FXSD3 supervises the 1.2V rail and drives RESET to multiple sub-microcontrollers via shared open-drain bus. Use Value: Wired-OR capability enables single-point reset coordination across distributed MCUs; MR pin allows service-mode forced reset via diagnostic tool. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6381XR22-T | Push-pull active-low RESET, 2.2V threshold, 1.5ms timeout, SC70-3 package | Lacks MR input and open-drain flexibility; suited for simpler 2.2V systems without level shifting | Select when board space is constrained to 3-pin footprint and higher supply voltage is used |
| TPS3123E12DBVR | Open-drain active-low RESET, 1.2V threshold, 200ms timeout, SOT-23-5 package | Includes watchdog timer and higher 1.2V threshold; requires 5-pin layout and lacks MR debounce | Choose when watchdog functionality is required alongside reset, and 1.2V nominal threshold matches design |
Compared with MAX6837FXSD3, MAX6381XR22-T offers smaller footprint but no MR debounce or open-drain versatility, while TPS3123E12DBVR adds watchdog capability at the cost of larger package and missing manual reset integration-making MAX6837FXSD3 optimal for compact, MR-dependent, multi-rail 1.2V systems.
Availability
MAX6837FXSD3 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, medical wearables, industrial PLC I/O modules, and automotive BCM subsystems requiring stable component supply with long-term lifecycle support.
Supply support for MAX6837FXSD3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor supervision in space- and power-constrained systems operating from 1.2V to 1.8V supplies, emphasizing minimal external components and robust transient immunity.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6837FXSD3?
The MAX6837FXSD3 has a factory-set reset threshold of 1.050V with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix F, and applies to VCC monitoring-not RESET-IN, which is not present on MAX6837FXSD3.
Does MAX6837FXSD3 include a manual reset input, and how is it implemented?
Yes, MAX6837FXSD3 includes a debounced manual reset input (MR) on Pin 3. It features an internal 20kΩ pullup resistor to VCC, requires only a momentary switch to ground for reset initiation, and rejects glitches <100ns. No external RC network is needed, simplifying PCB layout and firmware design.
What is the function of the RESET pin on MAX6837FXSD3, and what external component is required?
The RESET pin (Pin 2) on MAX6837FXSD3 is an open-drain active-low output. A pullup resistor must be connected externally-typically to VCC or another compatible rail (up to 6V)-to establish a defined HIGH state when reset is inactive. The device sinks up to 200µA when asserted, enabling direct interfacing with bidirectional µP reset pins.
What is the guaranteed reset timeout period for MAX6837FXSD3, and where is it specified?
The guaranteed reset timeout period for MAX6837FXSD3 is 210ms, corresponding to the D3 suffix per Table 2 ("Active Timeout Period Guide"). This value is production-tested and specified across temperature and voltage ranges, ensuring reliable µP initialization timing in all operating conditions.
Is MAX6837FXSD3 compatible with other Maxim reset IC families, and which ones?
MAX6837FXSD3 is pin-compatible with the MAX803/MAX809/MAX810 series, MAX6711/MAX6712/MAX6713 series, and MAX6381–MAX6390 series per the datasheet's Features section. This enables drop-in replacement in existing designs using those families, provided the 4-pin SC70-4 footprint and open-drain output configuration are supported.
MAX6837FXSD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.05V
- 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
MAX6837FXSD3 FAQ
1.How can I place an order for MAX6837FXSD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6837FXSD3 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 MAX6837FXSD3 reliable?
The price and inventory of MAX6837FXSD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6837FXSD3 is usually 5 days.
3.What payment methods are accepted for MAX6837FXSD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6837FXSD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6837FXSD3?
MAX6837FXSD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6837FXSD3 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 MAX6837FXSD3?
For technical support, including MAX6837FXSD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6837FXSD3 requirements.
6.How does Aetrix verify that MAX6837FXSD3 is sourced from the original manufacturer or authorized distributors?
All MAX6837FXSD3 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 MAX6837FXSD3 meets industry standards.
7.What is the process for return or replacement of MAX6837FXSD3?
All MAX6837FXSD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6837FXSD3, 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 MAX6837FXSD3 part is unused and in its original packaging.
Return procedure for MAX6837FXSD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6837FXSD3 Tags
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MIC826SYMT-TR
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