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Analog Devices Inc./Maxim Integrated MAX6835VXSD1+T
- Part No.:
- MAX6835VXSD1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6835VXSD1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,628
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Product details
Overview
MAX6835VXSD1+T from Maxim Integrated is a 4-pin SC70 ultra-low-voltage microprocessor reset circuit with push-pull active-low RESET output, 1.575V factory-set reset threshold (suffix V), and 1.5ms reset timeout period (suffix D1). It monitors +1.2V to +1.8V supplies in portable and battery-powered systems, asserting reset during brownout or power-up until VCC exceeds threshold and timeout elapses. Designed for critical µP power monitoring in space-constrained applications.
For engineers reviewing the MAX6835VXSD1+T datasheet, MAX6835VXSD1+T pinout, MAX6835VXSD1+T application, or MAX6835VXSD1+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 0.55V, ±2.5% threshold accuracy over temperature, debounced manual reset input (MR), low 7.5µA supply current, and compatibility with 3.3V/5V logic interfaces via open-drain or push-pull outputs.
Technical Context
The MAX6835VXSD1+T implements a precision voltage comparator with internal 444mV reference, comparing VCC against a resistor-divided threshold derived from the V suffix (1.575V). Its reset assertion logic combines VCC monitoring and debounced MR input, with fixed 1.5ms timeout generated by an on-chip RC oscillator - not dependent on external components.
It features a push-pull active-low RESET output capable of sinking 200µA at VCC ≥ 1.5V with VOL ≤ 0.2V, and includes internal 20kΩ MR pullup. The device ignores fast VCC transients (<100ns) and remains functional down to VCC = 0.55V, ensuring reliable reset signaling across full operating range (-40°C to +85°C).
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 | 1.5ms - guarantees µP reset hold time sufficient for stable clock and memory initialization |
| Supply Current | 7.5µA typical at +25°C - enables multi-year battery life in always-on monitoring circuits |
| Operating Voltage Range | +0.55V to +3.6V - supports valid reset assertion even during deep brownout conditions |
| MR Input Pulse Width | 2µs minimum - allows clean reset initiation from mechanical switches or digital logic without external debounce |
| RESET Output Type | Push-pull active-low - eliminates need for external pullup resistor and simplifies interface to CMOS inputs |
| Package | SC70-4 - 1.25mm × 1.65mm footprint ideal for wearables and compact IoT nodes |
Pinout & Package
MAX6835VXSD1+T is housed in a 4-pin SC70 package (1.25mm × 1.65mm, 0.65mm pitch) with exposed pad for thermal performance. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground for all internal comparators and output drivers; must be low-impedance connection to system ground plane |
| 2 | RESET | Push-pull active-low reset output; drives CMOS-compatible low state (≤0.2V) without external pullup |
| 3 | MR | Debounced active-low manual reset input; internally pulled up to VCC (20kΩ); accepts CMOS or open-drain signals |
| 4 | VCC | Monitored supply input and power source; operates from 0.55V–3.6V; powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.575V threshold | Eliminates external resistor network and calibration, reducing BOM count and layout area |
| 1.5ms fixed timeout | Guarantees sufficient reset duration for modern low-power µPs without timing uncertainty |
| 7.5µA supply current | Enables continuous monitoring in energy-harvesting and coin-cell-powered devices |
| ±2.5% threshold accuracy over temp | Ensures consistent trip point across industrial temperature range without derating |
| Debounced MR input | Removes need for external RC filter or firmware debounce, simplifying system-level reset design |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
Use Scenario: Continuous ECG sampling powered by CR2032 battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Monitors 1.5V LDO output to assert reset if battery sags below 1.4V during RF burst, holding µC in reset until voltage recovers and 1.5ms timeout expires. Use Value: Prevents corrupted sensor data writes and flash corruption during brownout, extending field reliability beyond 2 years. |
Use Scenario: Wireless vibration sensor mounted on rotating machinery, operating unattended for months. IC Role / Device Role / Timing Role: Supervises 1.8V core supply of ARM Cortex-M0+; asserts reset on power-up sequencing failure or transient-induced undervoltage. Use Value: Guarantees deterministic boot state after cold start or line disturbance, eliminating firmware lockup in remote deployments. |
| Smart Meter MCU | Portable Diagnostic Tool |
Use Scenario: Dual-supply meter with 3.3V I/O and 1.2V core, subject to utility grid fluctuations. IC Role / Device Role / Timing Role: Dedicated reset supervisor for 1.2V core rail; triggers reset when VCC drops below 1.575V, independent of I/O supply stability. Use Value: Isolates core logic reset from I/O domain noise, preventing partial initialization and EEPROM write errors. |
Use Scenario: Handheld medical analyzer using rechargeable Li-ion with dynamic load switching between display, ADC, and USB charging. IC Role / Device Role / Timing Role: Provides hardware reset coordination between battery management IC and application µC during charge/discharge transitions. Use Value: Ensures synchronized power-state transitions and eliminates race conditions during mode switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6835VXSD3+T | Same package, threshold, and MR functionality but 210ms timeout instead of 1.5ms | Suitable for systems requiring longer reset hold time, e.g., FPGA configuration or multi-rail power sequencing | Select when extended reset assertion is needed for complex initialization sequences |
| MAX6316HPU29D3+T | 2.93V threshold, SOT23-5 package, 200ms timeout, no MR input | Designed for higher-voltage rails (3.3V/5V); lacks manual reset capability and ultra-low-voltage operation | Use only for non-battery, higher-supply applications where MR is unnecessary and 1.575V threshold is not required |
Compared with MAX6835VXSD1+T, the MAX6835VXSD3+T offers identical supervision architecture but extends reset hold time for complex boot flows, while the MAX6316HPU29D3+T targets higher-voltage domains without manual reset support - neither provides drop-in replacement due to timeout mismatch and threshold/voltage-range differences.
Availability
MAX6835VXSD1+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, and critical µP power monitoring requiring stable component supply across automotive-grade temperature ranges.
Supply support for MAX6835VXSD1+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, with emphasis on high-reliability, low-power solutions.
The MAX6832–MAX6840 family was developed specifically for ultra-low-voltage microprocessor supervision in space- and power-constrained systems, targeting portable electronics and battery-operated instrumentation.
FAQ
What is the reset threshold voltage of the MAX6835VXSD1+T?
The MAX6835VXSD1+T has a factory-set reset threshold of 1.575V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is defined by the "V" suffix in the part number and is optimized for reliable supervision of 1.6V nominal supplies. The threshold is internally generated using a precision bandgap reference and trimmed during wafer test.
Does the MAX6835VXSD1+T require an external pullup resistor on the RESET pin?
No, the MAX6835VXSD1+T features a push-pull active-low RESET output, so it actively drives both high and low states without requiring an external pullup resistor. When reset is asserted, RESET is driven low (≤0.2V at 200µA sink); when deasserted, it is driven high to VCC level. This eliminates BOM cost and layout complexity associated with open-drain alternatives.
What is the function of the MR pin on the MAX6835VXSD1+T?
The MR (Manual Reset) pin on the MAX6835VXSD1+T is an active-low, debounced input with internal 20kΩ pullup to VCC. Pulling MR low forces an immediate reset regardless of VCC level, and reset remains asserted for the full 1.5ms timeout after MR returns high. This enables hardware-initiated resets via momentary switches or logic signals without external filtering.
Can the MAX6835VXSD1+T operate below 1.2V supply voltage?
Yes, the MAX6835VXSD1+T is fully specified to operate down to VCC = 0.55V, and its reset output remains valid (actively driven low) throughout this range. Below 0.55V, the RESET output becomes high-impedance, but the device continues monitoring and will reassert reset once VCC rises above 1.575V. This supports deep brownout recovery in ultra-low-power systems.
What timeout period does the "D1" suffix indicate for the MAX6835VXSD1+T?
The "D1" suffix in MAX6835VXSD1+T specifies a typical reset active timeout period of 1.5ms. This fixed delay begins when VCC rises above the 1.575V threshold (or when MR is released) and ensures the reset signal remains asserted long enough for microprocessors to complete power-on initialization, including oscillator stabilization and register clearing.
MAX6835VXSD1+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:
- 1.665V
- 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
MAX6835VXSD1+T FAQ
1.How can I place an order for MAX6835VXSD1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6835VXSD1+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 MAX6835VXSD1+T reliable?
The price and inventory of MAX6835VXSD1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6835VXSD1+T is usually 5 days.
3.What payment methods are accepted for MAX6835VXSD1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6835VXSD1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6835VXSD1+T?
MAX6835VXSD1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6835VXSD1+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 MAX6835VXSD1+T?
For technical support, including MAX6835VXSD1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6835VXSD1+T requirements.
6.How does Aetrix verify that MAX6835VXSD1+T is sourced from the original manufacturer or authorized distributors?
All MAX6835VXSD1+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 MAX6835VXSD1+T meets industry standards.
7.What is the process for return or replacement of MAX6835VXSD1+T?
All MAX6835VXSD1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6835VXSD1+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 MAX6835VXSD1+T part is unused and in its original packaging.
Return procedure for MAX6835VXSD1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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