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Analog Devices Inc./Maxim Integrated MAX6835FXSD3+
- Part No.:
- MAX6835FXSD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6835FXSD3+.pdf
- Description:
- MAX6835 ULTRA-LOW-VOLTAGE VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:1,901
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Product details
Overview
MAX6835FXSD3+ from Maxim Integrated is a micropower voltage supervisor IC designed to monitor +1.2V to +1.8V supply rails in low-voltage microprocessor systems. It features a factory-set 1.050V reset threshold, 210ms active timeout period (D3 suffix), push-pull active-low RESET output, and debounced manual reset input (MR). It ensures reliable power-on reset and brownout protection in portable battery-powered equipment.
For engineers reviewing the MAX6835FXSD3+ datasheet, MAX6835FXSD3+ pinout, MAX6835FXSD3+ application, or MAX6835FXSD3+ equivalent, key selection criteria include its 7.5µA typical supply current, ±2.5% threshold accuracy over temperature, SC70-4 package compatibility, and immunity to short VCC transients - all critical for ultra-low-power embedded reset design.
Technical Context
The MAX6835FXSD3+ implements a precision bandgap-based voltage comparator with hysteresis (0.75% of VTH) to detect VCC drops below 1.050V. Its internal 20kΩ MR pullup enables direct switch-to-ground connection without external components.
It uses a fixed 210ms reset timeout after VCC recovery or MR release, with propagation delay under 70µs for D0 variants and startup time of 150µs from 0V. The push-pull active-low RESET output guarantees valid logic levels down to VCC = 0.55V (VOL ≤ 0.15V at 15µA sink).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.050V ±2.5% - precisely matches 1.05V nominal supply monitoring with guaranteed accuracy across -40°C to +85°C |
| Reset Timeout Period | 210ms - provides sufficient hold time for µP initialization and peripheral stabilization after power recovery |
| Supply Current | 7.5µA (typ) at 1.2V - enables multi-year battery life in always-on portable instrumentation |
| Operating Voltage Range | 0.55V to 3.6V - supports operation during deep brownout and ensures reset assertion even as VCC collapses |
| Output Type | Push-pull active-low RESET - eliminates need for external pullup and drives CMOS inputs directly |
| MR Input | Debounced, internal 20kΩ pullup - allows momentary switch interface without external RC filtering or logic |
| VCC Immunity | Rejects <100ns negative transients - prevents false resets from digital noise or switching glitches on supply rail |
Pinout & Package
MAX6835FXSD3+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be connected to system ground plane |
| 2 | RESET | Push-pull active-low reset output; sinks current when asserted, high-impedance when deasserted - directly interfaces µP reset pin |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; falling edge initiates reset with 500ns delay and 2µs minimum pulse width |
| 4 | VCC | Supply voltage input and monitored rail; powers device and serves as reference for reset threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.050V threshold | Eliminates external resistor divider and calibration, reducing BOM count and layout area for 1.05V core supplies |
| 210ms reset timeout (D3) | Guarantees µP reset hold time exceeds boot ROM execution and PLL lock requirements in most low-power MCUs |
| 7.5µA supply current | Enables integration into energy-harvesting and coin-cell-powered sensors without compromising battery lifetime |
| SC70-4 package | Provides 40% smaller footprint than SOT-23-4 while maintaining thermal performance for handheld devices |
| MR debounce & 20kΩ pullup | Supports direct mechanical switch connection with no external components - reduces assembly cost and failure points |
Applications
| Battery-Powered IoT Sensor Node | Low-Voltage Microcontroller System |
|---|---|
Use Scenario: A wireless environmental sensor powered by a CR2032 coin cell monitors temperature and transmits data every 5 minutes. IC Role / Device Role / Timing Role: MAX6835FXSD3+ asserts reset during cold-start and brownout events caused by battery sag under RF transmit load. Use Value: Its 7.5µA quiescent current extends battery life beyond 3 years, while 210ms timeout ensures full MCU initialization before sensor sampling begins. |
Use Scenario: An industrial programmable logic controller (PLC) module uses a 1.2V FPGA core supplied by a DC/DC converter. IC Role / Device Role / Timing Role: MAX6835FXSD3+ monitors the 1.2V rail and holds FPGA in reset until voltage stabilizes post-power-up. Use Value: The 1.050V threshold aligns with FPGA VCC min specification, and push-pull RESET avoids level-shifting complexity in mixed-voltage designs. |
| Portable Medical Diagnostic Device | Wearable Health Monitor |
Use Scenario: A handheld ECG reader operates from a single Li-ion cell regulated to 1.5V for analog front-end and digital logic. IC Role / Device Role / Timing Role: MAX6835FXSD3+ detects undervoltage during battery discharge and forces controlled shutdown before ADC corruption occurs. Use Value: ±2.5% threshold accuracy over temperature prevents premature shutdown at body-warm operating conditions (37°C). |
Use Scenario: A wrist-worn pulse oximeter uses a 1.8V SoC powered by a thin-film battery, requiring fail-safe reset during sleep/wake transitions. IC Role / Device Role / Timing Role: MAX6835FXSD3+ provides deterministic reset timing via its fixed 210ms timeout, synchronizing wake-up sequence across analog and digital subsystems. Use Value: Debounced MR input allows user-initiated recalibration without firmware intervention, improving field usability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6381XR29D3+ | Same 1.05V threshold and 210ms timeout, but SC70-5 package with separate VDD/VSENSE pins enabling independent monitoring of different rails | Used where dual-rail monitoring (e.g., I/O and core) is required; not suitable for single-rail space-constrained layouts | Select MAX6381XR29D3+ only if rail separation or higher accuracy (±1.5%) justifies larger footprint and cost premium |
| TPS3123E10DBVR | 1.0V threshold (not 1.05V), 200ms timeout, 3.5µA supply current, SOT-23-5 package with watchdog timer function | Offers watchdog capability but lacks MR input; threshold mismatch risks false resets on 1.05V systems | Choose TPS3123E10DBVR only if watchdog functionality is mandatory and 50mV threshold tolerance is acceptable in the target design |
Compared with MAX6835FXSD3+, MAX6381XR29D3+ adds rail separation flexibility at the cost of board area, while TPS3123E10DBVR trades threshold precision for ultra-low current and watchdog integration - neither offers drop-in replacement capability due to pinout, threshold, or feature mismatches.
Availability
MAX6835FXSD3+ is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, low-voltage microcontroller systems, and portable medical diagnostic devices requiring stable component supply and long-term lifecycle support.
Supply support for MAX6835FXSD3+ 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, automotive, and communications markets.
The MAX6832–MAX6840 family was engineered specifically for ultra-low-voltage reset supervision in portable and battery-critical systems, targeting applications where sub-1µA quiescent current and SC70 packaging are essential design constraints.
FAQ
What is the exact reset threshold voltage of the MAX6835FXSD3+ and how accurate is it over temperature?
The MAX6835FXSD3+ has a factory-set reset threshold of 1.050V with ±2.5% accuracy over the full operating temperature range of -40°C to +85°C. This value is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix F. The accuracy specification ensures reliable detection of 1.05V supply droop without false triggering or missed events across environmental conditions.
Does the MAX6835FXSD3+ require an external pullup resistor on its RESET pin?
No, the MAX6835FXSD3+ does not require an external pullup resistor because it features a push-pull active-low RESET output. The internal driver actively pulls RESET low during assertion and releases it to high-impedance (not driven high) when deasserted - compatible with standard CMOS reset inputs without additional components.
What is the function of the MR pin on the MAX6835FXSD3+ and how should it be interfaced?
The MR pin on the MAX6835FXSD3+ is a debounced, active-low manual reset input with an internal 20kΩ pullup to VCC. To initiate reset, drive MR to GND using a momentary switch or logic signal. No external debounce circuitry is needed. Leaving MR unconnected defaults it to high, disabling manual reset functionality.
What timeout period is implemented in the MAX6835FXSD3+ and how is it selected?
The MAX6835FXSD3+ implements a 210ms reset active timeout period, indicated by the "D3" suffix in its part number. This fixed delay is factory-programmed and ensures RESET remains asserted for 210ms after VCC rises above 1.050V or after MR is released - providing sufficient hold time for microprocessor initialization sequences.
Can the MAX6835FXSD3+ operate reliably at VCC voltages below 1.0V?
Yes, the MAX6835FXSD3+ guarantees valid reset operation down to VCC = 0.55V for active-low output (VOL ≤ 0.15V at 15µA sink), and functions electrically across 0.55V to 3.6V. However, reset assertion is only guaranteed when VCC falls below the 1.050V threshold - operation below 1.05V is for brownout response, not functional logic operation.
MAX6835FXSD3+ 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:
- Push-Pull, Totem Pole
- 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
MAX6835FXSD3+ FAQ
1.How can I place an order for MAX6835FXSD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6835FXSD3+ 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 MAX6835FXSD3+ reliable?
The price and inventory of MAX6835FXSD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6835FXSD3+ is usually 5 days.
3.What payment methods are accepted for MAX6835FXSD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6835FXSD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6835FXSD3+?
MAX6835FXSD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6835FXSD3+ 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 MAX6835FXSD3+?
For technical support, including MAX6835FXSD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6835FXSD3+ requirements.
6.How does Aetrix verify that MAX6835FXSD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6835FXSD3+ 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 MAX6835FXSD3+ meets industry standards.
7.What is the process for return or replacement of MAX6835FXSD3+?
All MAX6835FXSD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6835FXSD3+, 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 MAX6835FXSD3+ part is unused and in its original packaging.
Return procedure for MAX6835FXSD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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