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Analog Devices Inc./Maxim Integrated MAX6837VXSD3+T
- Part No.:
- MAX6837VXSD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6837VXSD3+T.pdf
- Description:
- IC MPU SUPERVISOR SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
MAX6837VXSD3+T from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in SC70-4 package, designed to monitor +1.575V supply rails with ±2.5% threshold accuracy over temperature. It features a 210ms reset timeout, 7.5µA typical supply current, and debounced manual reset input (MR), enabling reliable power-on/brownout reset assertion in portable and battery-powered systems.
For engineers reviewing the MAX6837VXSD3+T datasheet, MAX6837VXSD3+T pinout, MAX6837VXSD3+T application, or MAX6837VXSD3+T equivalent, this page delivers verified electrical parameters, SC70-4 terminal mapping, timeout behavior under VCC transients, MR debounce timing, and design-critical open-drain RESET interface constraints including pullup voltage compatibility up to +6.0V.
Technical Context
The MAX6837VXSD3+T implements a precision bandgap-based voltage comparator with 444mV internal reference, comparing VCC against factory-trimmed 1.575V threshold (suffix 'V'). Its reset assertion logic responds to VCC falling below threshold or MR low pulse ≥2µs, holding RESET low for exactly 210ms after recovery - no external timing components required.
It integrates a 20kΩ internal MR pullup resistor and supports noise immunity via optional 0.1µF MR-to-GND capacitor. The open-drain RESET output sinks up to 200µA at VCC ≥1.5V while maintaining VOL ≤0.2V, and exhibits <1.0µA leakage when deasserted - enabling level-shifted reset signaling across multiple supply domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±2.5% over -40°C to +85°C - ensures accurate brownout detection for 1.6V nominal supplies |
| Reset Timeout Period | 210ms (D3 option) - guarantees µP initialization completes before release, eliminating race conditions |
| Supply Current | 7.5µA typical at VCC = 1.2V - enables multi-year battery life in always-on monitoring applications |
| MR Input Pulse Width | ≥2µs minimum - supports clean manual reset without external debouncing circuitry |
| RESET Output Type | Open-drain active-low - allows pullup to any voltage ≤+6.0V, enabling level-shifting to higher-voltage logic |
| VCC Operating Range | +0.55V to +3.6V - guarantees valid reset assertion down to near-zero supply, critical for deep power-down recovery |
| Reset Propagation Delay | 60µs max on VCC fall - ensures rapid response to supply glitches before system corruption occurs |
Pinout & Package
MAX6837VXSD3+T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable designs. Pin 1 = GND, Pin 2 = RESET (open-drain active-low), Pin 3 = MR (debounced active-low manual reset), Pin 4 = VCC (monitored supply input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for internal comparator, MR pullup, and RESET sink current; must be low-impedance |
| 2 (RESET) | Open-drain active-low reset output | Drives low during reset; requires external pullup (to VCC or higher voltage ≤+6.0V); sinks 200µA max at VCC ≥1.5V |
| 3 (MR) | Debounced active-low manual reset input | Pulled up internally to VCC via 20kΩ; asserts reset when pulled ≤0.3×VCC; rejects <100ns glitches |
| 4 (VCC) | Monitored supply input | Power source and voltage sense node; operates from +0.55V to +3.6V; reset valid down to 0.55V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.575V threshold | Eliminates external resistor dividers and calibration, reducing BOM count and layout area in 1.6V-core systems |
| 210ms fixed timeout (D3) | Guarantees sufficient hold time for slow-starting DC/DC converters and flash memory initialization sequences |
| Debounced MR input | Removes need for external RC filter or logic gate, simplifying pushbutton reset implementation in handheld devices |
| Open-drain RESET with 6V tolerance | Enables single reset signal to coordinate power sequencing across mixed-supply domains (e.g., 1.2V core + 3.3V I/O) |
| 7.5µA supply current | Supports >10-year battery life in coin-cell-powered IoT sensors using periodic wake-up and reset monitoring |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable ECG patch monitoring heart rhythm continuously on CR2032 coin cell. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during battery voltage sag below 1.575V or user-initiated firmware update. Use Value: Prevents corrupted memory writes during brownout by holding µC in reset until stable 1.6V rail is restored for 210ms. |
Use Scenario: LoRaWAN soil moisture sensor deployed in remote fields, waking every 15 minutes. IC Role / Device Role / Timing Role: Voltage detector ensuring clean µC boot after cold-start from depleted Li-SOCl₂ battery. Use Value: 7.5µA quiescent current extends field lifetime beyond 15 years; open-drain RESET interfaces directly to 3.3V radio reset pin. |
| Industrial Handheld Terminals | Low-Power Edge AI Modules |
Use Scenario: Ruggedized barcode scanner operating in warehouses with frequent battery swaps. IC Role / Device Role / Timing Role: Reset supervisor validating 1.6V FPGA configuration supply before JTAG initialization. Use Value: Debounced MR input accepts mechanical switch actuation without false triggers; 210ms timeout accommodates FPGA bitstream load time. |
Use Scenario: TinyML inference module running neural network on sub-1V embedded SRAM. IC Role / Device Role / Timing Role: Core supply monitor asserting reset if 1.575V rail dips during high-current AI accelerator burst. Use Value: ±2.5% threshold accuracy over temperature prevents premature resets during thermal cycling; 60µs propagation delay catches fast transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor 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 fixed-threshold, single-supply systems only | Select when board space is constrained (3-pin) and level-shifting is unnecessary |
| TPS3808G15DBVR | Adjustable threshold via external resistor, 1.5V min threshold, 200ms timeout, SOT-23-5 | Requires external resistor network; higher 12µA ICC; includes watchdog timer not present in MAX6837VXSD3+T | Choose when adjustable trip point or watchdog functionality is required alongside reset supervision |
Compared with MAX6837VXSD3+T, MAX6381XR22+T saves one pin but sacrifices MR debouncing and open-drain level-shifting; TPS3808G15DBVR adds configurability and watchdog capability at the cost of higher current and external component dependency.
Availability
MAX6837VXSD3+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6837VXSD3+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 interface applications in industrial, automotive, and computing markets.
The MAX6832–MAX6840 family delivers ultra-low-power, SC70-packaged voltage supervisors targeting portable and battery-critical systems where size, current, and reset reliability are paramount.
FAQ
What is the exact reset threshold voltage of MAX6837VXSD3+T?
The MAX6837VXSD3+T has a factory-trimmed reset threshold of 1.575V, specified with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value corresponds to the 'V' suffix in the part number and is guaranteed by design, not typical-only. The threshold remains stable due to internal bandgap reference and hysteresis of 0.75% of VTH.
Does MAX6837VXSD3+T require an external pullup resistor on the RESET pin?
Yes, MAX6837VXSD3+T requires an external pullup resistor on the RESET pin because it features an open-drain active-low output. The pullup may connect to VCC or any compatible voltage up to +6.0V. Typical values range from 10kΩ to 100kΩ depending on rise-time requirements and bus loading; the device sinks up to 200µA while asserted.
Can MAX6837VXSD3+T monitor supply voltages below 1.2V?
No, MAX6837VXSD3+T is factory-configured for 1.575V threshold and is not designed to monitor supplies below 1.2V. Its VCC operating range starts at +0.55V, but the reset function relies on comparison against the fixed 1.575V internal reference. For sub-1.2V monitoring, consider the MAX6838–MAX6840 series with RESET-IN input and 444mV reference.
What is the minimum pulse width required on the MR pin to trigger reset in MAX6837VXSD3+T?
The MR pin of MAX6837VXSD3+T requires a minimum low pulse width of 2µs to reliably assert reset. This specification is tested under VCC = 1.2V to 3.6V and ensures immunity to noise spikes. The internal debounce circuit rejects transients shorter than 100ns, making external filtering unnecessary in most PCB layouts.
Is MAX6837VXSD3+T pin-compatible with older Maxim reset ICs like MAX809?
MAX6837VXSD3+T is not pin-compatible with MAX809. While both are reset supervisors, MAX809 uses SOT-23-3 packaging with different pinout (VCC–GND–RESET), whereas MAX6837VXSD3+T is SC70-4 with pins GND–RESET–MR–VCC. However, the MAX6832–MAX6840 family is explicitly stated as pin-compatible with MAX6711/MAX6712/MAX6713 and MAX6381–MAX6390 series - not MAX809.
MAX6837VXSD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- 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+T FAQ
1.How can I place an order for MAX6837VXSD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6837VXSD3+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 MAX6837VXSD3+T reliable?
The price and inventory of MAX6837VXSD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6837VXSD3+T is usually 5 days.
3.What payment methods are accepted for MAX6837VXSD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6837VXSD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6837VXSD3+T?
MAX6837VXSD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6837VXSD3+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 MAX6837VXSD3+T?
For technical support, including MAX6837VXSD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6837VXSD3+T requirements.
6.How does Aetrix verify that MAX6837VXSD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6837VXSD3+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 MAX6837VXSD3+T meets industry standards.
7.What is the process for return or replacement of MAX6837VXSD3+T?
All MAX6837VXSD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6837VXSD3+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 MAX6837VXSD3+T part is unused and in its original packaging.
Return procedure for MAX6837VXSD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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