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Analog Devices Inc./Maxim Integrated MAX6835VXSD3
- Part No.:
- MAX6835VXSD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6835VXSD3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,670
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Product details
Overview
The MAX6835VXSD3 from Maxim Integrated is a precision ultra-low-voltage microprocessor supervisory circuit in SC70-4 package, featuring a push-pull active-low reset output, factory-set 1.575V reset threshold (suffix V), and 210ms reset timeout (suffix D3). It monitors +1.2V to +1.8V supplies, consumes only 7.5µA typical supply current, and guarantees valid reset assertion down to VCC = 0.55V - designed for reliable power-on/power-down sequencing in portable µP systems.
For engineers reviewing the MAX6835VXSD3 datasheet, MAX6835VXSD3 pinout, MAX6835VXSD3 application, or MAX6835VXSD3 equivalent, key selection considerations include its 4-pin SC70 footprint, debounced manual reset input (MR), ±2.5% threshold accuracy over temperature, immunity to short VCC transients, and compatibility with low-noise, battery-sensitive embedded designs.
Technical Context
The MAX6835VXSD3 implements a precision voltage comparator with internal 444mV reference, comparing VCC against a factory-trimmed threshold (1.575V) to assert RESET when supply drops below specification. Its reset timeout is fixed at 210ms via internal timing circuitry, independent of external components.
It integrates a debounced MR input with 20kΩ internal pullup, rejecting glitches <100ns and requiring only 2µs minimum pulse width. The push-pull active-low RESET output sinks 200µA at VCC ≥1.5V with VOL ≤0.2V, ensuring robust interface with CMOS µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±2.5% - precisely set for 1.6V nominal core supplies; ensures reset assertion before logic corruption |
| Reset Timeout Period | 210ms - provides sufficient hold time for µP initialization after brownout recovery |
| Supply Current | 7.5µA (typ) at 1.2V - enables multi-year battery life in always-on monitoring applications |
| VCC Operating Range | +0.55V to +3.6V - guarantees functional reset assertion even during deep brownout (down to 0.55V) |
| MR Input Logic | Active-low with 20kΩ internal pullup - eliminates need for external resistor; supports direct switch-to-ground connection |
| RESET Output Type | Push-pull active-low - drives low without external components; compatible with standard µP reset pins |
| Temperature Range | -40°C to +85°C - qualified for industrial and automotive cabin-ambient environments |
Pinout & Package
MAX6835VXSD3 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable PCBs. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Primary return path for internal comparator and output driver; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-Low Reset Output | Push-pull CMOS output asserting LOW during fault; directly interfaces µP reset pin without pullup resistor |
| 3 (MR) | Debounced Manual Reset Input | Active-low input with internal 20kΩ pullup; accepts momentary switch to GND; rejects <100ns noise spikes |
| 4 (VCC) | Supply & Monitored Voltage | Power source and monitored rail; device asserts reset when this voltage falls below 1.575V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Set 1.575V Threshold | Eliminates external resistor divider; reduces BOM count and layout area while maintaining ±2.5% accuracy from -40°C to +85°C |
| 210ms Fixed Timeout | Guarantees µP reset hold time exceeds boot ROM execution window; no capacitor tolerance drift or temperature drift |
| 7.5µA Supply Current | Enables continuous supervision in energy-harvesting or coin-cell-powered devices without measurable battery drain |
| Debounced MR Input | Removes need for external RC filter or firmware debounce; supports direct mechanical switch integration with no added latency |
| VCC = 0.55V Reset Validity | Ensures deterministic reset state during deep undervoltage - prevents metastability in downstream logic during final power collapse |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG sensor operating from single Li-ion cell with dynamic voltage sag during RF transmission. IC Role / Device Role / Timing Role: Supervises 1.5V analog front-end and 1.8V MCU core; asserts reset within 60µs of VCC drop below 1.575V. Use Value: Prevents corrupted ADC sampling and firmware lockup during transient brownout, enabling automatic recovery without host intervention. |
Use Scenario: DIN-rail mounted digital input module exposed to 24V DC supply ripple and cold-start voltage ramp. IC Role / Device Role / Timing Role: Monitors isolated 1.5V logic supply derived from buck converter; holds µC in reset until stable post-power-up. Use Value: Eliminates spurious I/O state changes during power ramp; 210ms timeout matches worst-case converter soft-start duration. |
| Battery-Powered IoT Edge Nodes | Automotive Body Control Modules |
Use Scenario: Sub-GHz wireless node powered by alkaline AA cells, experiencing gradual voltage decay over months. IC Role / Device Role / Timing Role: Detects end-of-life voltage collapse at 1.575V; triggers graceful shutdown sequence via µC interrupt on RESET deassertion. Use Value: Extends usable battery life by avoiding premature shutdown; 7.5µA quiescent current adds <0.01% monthly drain. |
Use Scenario: Door module subjected to load dump and cold-crank conditions causing 5V rail dip to 1.2V. IC Role / Device Role / Timing Role: Supervises 1.5V domain powering CAN transceiver and wake-up logic; asserts reset during 12V battery sag. Use Value: Maintains CAN bus integrity by preventing partial register writes; immune to 100ns VCC glitches per ISO 7637-2 Pulse 1/2a. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6381XR24D3+ | Same SC70-4 package, 2.4V reset threshold, 210ms timeout, but no MR input; 10µA supply current | Designed for higher-voltage I/O rails; lacks manual reset capability required for field service diagnostics | Select only if monitoring >2.0V supplies and MR functionality is unnecessary |
| TPS3123E15DBVR | 3-pin SOT-23, 1.5V threshold, 200ms timeout, 1.8µA supply current, but no MR input and ±3% accuracy | Ultra-low-power focus; smaller footprint but incompatible pinout and missing debounced MR | Prefer for space- and energy-critical designs where MR is omitted and 0.5% threshold tolerance is acceptable |
Compared with MAX6835VXSD3, MAX6381XR24D3+ serves higher-supply applications without manual reset, while TPS3123E15DBVR trades MR functionality and tighter threshold accuracy for lower quiescent current and smaller package - neither offers pin compatibility or identical feature set.
Availability
MAX6835VXSD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, battery-powered IoT edge nodes, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6835VXSD3 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 engineered specifically for ultra-low-voltage µP supervision in space- and power-constrained systems, emphasizing factory-trimmed accuracy, minimal external components, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6835VXSD3?
MAX6835VXSD3 has a factory-set reset threshold of 1.575V with ±2.5% accuracy over the full -40°C to +85°C temperature range. This value is confirmed in the Threshold Suffix Guide (suffix V) and Electrical Characteristics table under VTH parameter for MAX6835 devices. The threshold remains stable due to internal trimming and BiCMOS process design.
Does the MAX6835VXSD3 require an external pullup resistor on the RESET pin?
No, MAX6835VXSD3 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 fault and high during normal operation, eliminating dependency on external components for level setting - unlike open-drain variants such as MAX6834/MAX6837.
What is the function of the MR pin on the MAX6835VXSD3?
The MR (Manual Reset) pin on MAX6835VXSD3 is an active-low input with a built-in 20kΩ pullup resistor to VCC. Pulling MR low forces an immediate reset regardless of VCC level, and reset remains asserted for the full 210ms timeout after MR returns high. This enables hardware-initiated recovery without µP intervention.
Can the MAX6835VXSD3 operate reliably below 1.0V supply voltage?
Yes, MAX6835VXSD3 guarantees functional reset assertion down to VCC = 0.55V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 0.55V, the push-pull output becomes high-impedance, but the device continues to monitor and assert reset up to that point - critical for detecting final-stage brownout in battery systems.
Is the MAX6835VXSD3 pin-compatible with older Maxim supervisors like MAX809?
MAX6835VXSD3 is not pin-compatible with MAX809. While both are supervisory circuits, MAX809 uses SOT-23-3 packaging and lacks the MR pin present on the 4-pin SC70-4 MAX6835VXSD3. The datasheet explicitly states pin compatibility only with MAX6711–MAX6713 and MAX6381–MAX6390 series - not legacy MAX8xx devices.
MAX6835VXSD3 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:
- 1.665V
- 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
MAX6835VXSD3 FAQ
1.How can I place an order for MAX6835VXSD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6835VXSD3 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 MAX6835VXSD3 reliable?
The price and inventory of MAX6835VXSD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6835VXSD3 is usually 5 days.
3.What payment methods are accepted for MAX6835VXSD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6835VXSD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6835VXSD3?
MAX6835VXSD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6835VXSD3 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 MAX6835VXSD3?
For technical support, including MAX6835VXSD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6835VXSD3 requirements.
6.How does Aetrix verify that MAX6835VXSD3 is sourced from the original manufacturer or authorized distributors?
All MAX6835VXSD3 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 MAX6835VXSD3 meets industry standards.
7.What is the process for return or replacement of MAX6835VXSD3?
All MAX6835VXSD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6835VXSD3, 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 MAX6835VXSD3 part is unused and in its original packaging.
Return procedure for MAX6835VXSD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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