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Analog Devices Inc./Maxim Integrated MAX6837GXSD3+T
- Part No.:
- MAX6837GXSD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6837GXSD3+T.pdf
- Description:
- IC MPU SUPERVISOR SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:45,000
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Product details
Overview
MAX6837GXSD3+T from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in SC70-4 package, designed to monitor +1.11V supply rails with ±2.5% threshold accuracy over temperature. It features a 210ms reset timeout, debounced manual reset (MR) input, and guaranteed reset validity down to VCC = 0.55V. Used for reliable power-on reset in battery-powered microcontroller systems.
For engineers reviewing the MAX6837GXSD3+T datasheet, MAX6837GXSD3+T pinout, MAX6837GXSD3+T application, or MAX6837GXSD3+T equivalent, key selection criteria include reset threshold tolerance, MR debounce capability, open-drain output compatibility with bidirectional µP reset pins, and low 7.5µA supply current for portable designs.
Technical Context
The MAX6837GXSD3+T implements a precision voltage comparator with 444mV internal reference, comparing VCC against factory-set 1.110V threshold (G suffix). Its reset assertion logic triggers on VCC drop below threshold or MR pull-down, holding RESET low for exactly 210ms after recovery - no external timing components required.
It integrates a 20kΩ internal MR pullup resistor and supports noise-immune manual reset via momentary switch to GND. The open-drain RESET output allows level-shifting across supply domains and direct interfacing with bidirectional µP reset I/Os using a single external pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.110V ±2.5% - ensures accurate brownout detection for 1.2V core supplies |
| Reset Timeout Period | 210ms - provides sufficient hold time for µP initialization and clock stabilization |
| Supply Current | 7.5µA (typ) at 1.2V - enables multi-year operation in coin-cell–powered devices |
| Operating Voltage Range | 0.55V to 3.6V - guarantees functional reset assertion even during deep brownout |
| MR Input Logic | Active-low with internal 20kΩ pullup - eliminates need for external biasing; supports CMOS or open-drain drive |
| RESET Output Type | Open-drain active-low - enables wired-OR reset bus and interface with 0–6V pullup domains |
| Reset Propagation Delay | 60µs max - ensures fast response to supply faults without false triggering on transients |
Pinout & Package
MAX6837GXSD3+T is housed in a RoHS-compliant 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator |
| 2 | RESET | Open-drain active-low reset output; requires external pullup to define high-level voltage domain |
| 3 | MR | Debounced active-low manual reset input; internally pulled up to VCC (20kΩ) |
| 4 | VCC | Supply voltage input and monitored rail; powers device and sets comparator reference point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.110V reset threshold | Eliminates external resistor divider; reduces BOM count and layout area for 1.2V systems |
| 210ms fixed reset timeout | Guarantees µP reset hold time meets ARM Cortex-M and RISC-V boot requirements without capacitor tolerance drift |
| Debounced MR input | Removes need for external RC filter or firmware debounce, simplifying system-level reset button design |
| Open-drain RESET with 0.2V VOL @ 200µA | Ensures clean logic-low assertion into noisy or mixed-voltage reset buses |
| 7.5µA supply current | Extends battery life in always-on IoT sensors and wearables beyond 5 years on CR2032 |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch monitoring heart rate continuously on coin-cell power. IC Role / Device Role / Timing Role: Voltage detector and reset supervisor ensuring µC remains held in reset until 1.2V rail stabilizes post-battery insertion. Use Value: 7.5µA quiescent current extends operational lifetime; 210ms timeout aligns with BLE SoC wake-up sequence. |
Use Scenario: Remote analog input module operating in harsh factory environments with fluctuating 12V DC-DC outputs. IC Role / Device Role / Timing Role: Brownout detector asserting reset when 1.2V FPGA configuration rail dips below 1.110V due to load transients. Use Value: ±2.5% threshold accuracy prevents spurious resets; open-drain output interfaces directly with FPGA's bidirectional PROG_B pin. |
| Smart Meter Battery Backup | Automotive Body Control Module |
Use Scenario: Electricity meter retaining real-time clock and tamper logs during AC mains failure using supercapacitor backup. IC Role / Device Role / Timing Role: Supervisor monitoring 1.2V RTC supply derived from supercap, asserting reset if voltage falls below 1.110V during discharge. Use Value: Guaranteed reset validity down to VCC = 0.55V ensures deterministic behavior through full backup discharge cycle. |
Use Scenario: Door module controlling window lift and mirror adjustment using low-power MCU powered from 1.2V LDO. IC Role / Device Role / Timing Role: Reset generator triggered by MR button press (user-initiated module reset) or VCC brownout during cold-crank. Use Value: Debounced MR input rejects ESD-induced glitches; 20kΩ internal pullup removes external component from safety-critical path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6837HXSD3+T | Higher reset threshold (1.313V); identical pinout, timeout, and MR functionality | Suitable for 1.35V–1.5V I/O supply monitoring instead of 1.2V core rail | Select when system VCC nominal is ≥1.35V and tighter margin above 1.2V is required |
| MAX6381XR29+T | Same SC70-4 package; 2.93V threshold, 200ms timeout, no MR input, push-pull output | Lacks manual reset and open-drain flexibility; targets higher-voltage legacy systems | Choose only if 2.93V threshold matches main 3.3V rail and board lacks space for pullup resistor |
Compared with MAX6837GXSD3+T, the H-suffix variant shifts threshold upward for higher-supply applications, while MAX6381XR29+T sacrifices MR and open-drain capability for simpler 3.3V supervision - neither offers drop-in replacement due to threshold and functional mismatch.
Availability
MAX6837GXSD3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup circuits, and automotive body control modules requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6837GXSD3+T 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 connectivity applications.
The MAX6832–MAX6840 family delivers ultra-low-voltage reset supervision for battery-powered microcontrollers, emphasizing minimal quiescent current, tight threshold accuracy, and robust transient immunity in miniature SC70 packages.
FAQ
What is the exact reset threshold voltage of MAX6837GXSD3+T?
The MAX6837GXSD3+T has a factory-set reset threshold of 1.110V with ±2.5% accuracy over -40°C to +85°C. This value is defined by the 'G' suffix in the part number and is guaranteed by design per Maxim's Electrical Characteristics table. The threshold remains stable across temperature and supply variations, making MAX6837GXSD3+T suitable for precise 1.2V core rail monitoring where marginal brownout detection must be avoided.
Does MAX6837GXSD3+T require an external pullup resistor on the RESET pin?
Yes, MAX6837GXSD3+T requires an external pullup resistor on its open-drain RESET output to establish a valid HIGH logic level. The datasheet specifies that the pullup may connect to any voltage between 0V and 6V - enabling level-shifting to higher-voltage domains like 3.3V or 5V reset buses. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. Without this resistor, RESET cannot assert a defined HIGH state, rendering MAX6837GXSD3+T nonfunctional in most systems.
What is the function of the MR pin on MAX6837GXSD3+T?
The MR (Manual Reset) pin on MAX6837GXSD3+T is an active-low, debounced input with an internal 20kΩ pullup to VCC. Pulling MR low forces an immediate reset assertion, independent of VCC level, and reset remains active for the full 210ms timeout after MR returns high. This eliminates external debounce circuitry and supports direct connection to momentary switches or logic signals. Its presence distinguishes MAX6837GXSD3+T from non-MR variants like MAX6834, making it ideal for field-serviceable or test-mode reset functions.
Can MAX6837GXSD3+T operate reliably below 1.0V supply voltage?
Yes, MAX6837GXSD3+T is fully specified down to VCC = 0.55V and guarantees reset assertion validity at that level. Its internal comparator continues functioning, and the open-drain RESET output maintains sink capability (VOL ≤ 0.2V at 200µA) even as VCC declines. However, below 0.55V, reset behavior is not characterized. This extended low-voltage operation ensures deterministic reset during deep brownout events common in battery-depleted portable devices - a key reliability feature of MAX6837GXSD3+T.
Is MAX6837GXSD3+T pin-compatible with older Maxim reset ICs like MAX809?
No, MAX6837GXSD3+T is not pin-compatible with MAX809. While the datasheet notes "pin compatible with MAX803/MAX809/MAX810", that statement applies only to the 3-pin SC70-3 variants (e.g., MAX6832–MAX6834) - not the 4-pin MAX6835/MAX6836/MAX6837 series. MAX6837GXSD3+T uses SC70-4 with GND, RESET, MR, and VCC pins, whereas MAX809 uses SC70-3 with GND, RESET, and VCC. Direct replacement would require PCB redesign; MAX6837GXSD3+T offers enhanced functionality (MR, open-drain) at the cost of extra pin.
MAX6837GXSD3+T 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:
- 1.11V
- 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
MAX6837GXSD3+T FAQ
1.How can I place an order for MAX6837GXSD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6837GXSD3+T 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 MAX6837GXSD3+T reliable?
The price and inventory of MAX6837GXSD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6837GXSD3+T is usually 5 days.
3.What payment methods are accepted for MAX6837GXSD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6837GXSD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6837GXSD3+T?
MAX6837GXSD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6837GXSD3+T 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 MAX6837GXSD3+T?
For technical support, including MAX6837GXSD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6837GXSD3+T requirements.
6.How does Aetrix verify that MAX6837GXSD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6837GXSD3+T 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 MAX6837GXSD3+T meets industry standards.
7.What is the process for return or replacement of MAX6837GXSD3+T?
All MAX6837GXSD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6837GXSD3+T, 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 MAX6837GXSD3+T part is unused and in its original packaging.
Return procedure for MAX6837GXSD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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