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Analog Devices Inc./Maxim Integrated MAX6835FXSD3+T
- Part No.:
- MAX6835FXSD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6835FXSD3+T.pdf
- Description:
- IC MPU SUPERVISOR SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6835FXSD3+T from Maxim Integrated is a 4-pin SC70 ultra-low-voltage microprocessor reset circuit with push-pull active-low RESET output, 1.050V factory-set reset threshold, and 210ms reset timeout period. 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 MAX6835FXSD3+T datasheet, MAX6835FXSD3+T pinout, MAX6835FXSD3+T application, or MAX6835FXSD3+T equivalent, this page delivers verified specifications, package mapping, functional context, and real-world selection guidance - including manual reset debouncing, ±2.5% threshold accuracy over temperature, and guaranteed reset validity down to VCC = 0.55V.
Technical Context
The MAX6835FXSD3+T implements a precision voltage comparator with internal 1.050V reference, monitoring VCC directly without external components. Its reset assertion logic combines VCC falling-edge detection and debounced MR input, with fixed 210ms timeout generated by an on-chip RC timing network.
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 operates across -40°C to +85°C with supply current as low as 7.5µA at +25°C and VCC = 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.050V ±2.5% - ensures reliable reset assertion for 1.2V core supplies with tight tolerance over full temperature range |
| Reset Timeout Period | 210ms - provides sufficient hold time for slow-ramping µP power domains before release |
| Supply Current | 7.5µA (typ) at VCC = 1.2V - enables multi-year battery life in always-on portable instrumentation |
| Operating Voltage Range | +0.55V to +3.6V - guarantees reset functionality even during deep brownout conditions |
| Reset Output Type | Push-pull active-low - eliminates need for external pullup and supports direct CMOS interface |
| MR Input | Debounced with 20kΩ internal pullup - allows momentary switch connection without external RC filtering |
| Package | SC70-4 - 2.0mm × 2.1mm footprint ideal for ultra-dense PCB layouts in handheld devices |
Pinout & Package
MAX6835FXSD3+T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for high-density portable designs. Pin 1 is GND, Pin 2 is RESET (push-pull active-low), Pin 3 is MR (debounced manual reset), and Pin 4 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground for all internal comparators and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Push-pull active-low reset output; drives µP /RESET pin directly; sinks 200µA at VCC ≥ 1.5V with VOL ≤ 0.2V |
| 3 | MR | Active-low manual reset input with internal 20kΩ pullup to VCC; accepts CMOS-level signals; debounced internally |
| 4 | VCC | Monitored supply input and power source; valid operation from 0.55V to 3.6V; powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.050V threshold | Eliminates external resistor divider and calibration, reducing BOM count and layout area for 1.2V systems |
| 210ms fixed timeout | Guarantees µP reset hold time meets ARM Cortex-M0/M3 power-up sequencing requirements |
| 7.5µA supply current | Enables integration into energy-harvesting sensor nodes where quiescent power is constrained to <10µA |
| ±2.5% threshold accuracy | Maintains reset margin across -40°C to +85°C, preventing spurious resets in automotive cabin modules |
| Debounced MR input | Supports direct connection of mechanical switches without external RC networks or firmware debounce logic |
Applications
| Portable Medical Sensors | Battery-Powered IoT Edge Nodes |
|---|---|
Use Scenario: Wearable ECG patch operating from single Li-SOCl₂ cell with 1.2V LDO output. IC Role / Device Role / Timing Role: Monitors LDO output and asserts active-low reset to MSP430FR5994 MCU during battery depletion or cold-start brownout. Use Value: 210ms timeout ensures stable clock initialization before firmware execution; 7.5µA current extends shelf life beyond 5 years. |
Use Scenario: LoRaWAN soil moisture node powered by AA alkaline cells with 1.2V buck converter. IC Role / Device Role / Timing Role: Supervises 1.2V rail and triggers reset on voltage sag caused by RF transmit burst current draw. Use Value: 1.050V threshold aligns precisely with 1.2V supply dropout margin; debounced MR enables field firmware recovery via button press. |
| Industrial Handheld Terminals | Low-Power Smart Meters |
Use Scenario: Ruggedized barcode scanner using 1.2V core supply and cold-temperature operation (-20°C). IC Role / Device Role / Timing Role: Provides guaranteed reset assertion down to VCC = 0.55V and maintains ±2.5% threshold accuracy across full industrial temp range. Use Value: Push-pull output eliminates pullup resistor, reducing component count and PCB area in sealed enclosure designs. |
Use Scenario: AMI smart meter with dual-supply architecture (1.2V MCU core, 3.3V RF section). IC Role / Device Role / Timing Role: Dedicated supervisor for 1.2V core domain, independent of 3.3V rail behavior. Use Value: SC70-4 package fits within tight spacing constraints near MCU; 210ms timeout accommodates slow LDO startup after power restoration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 1.68V reset threshold, 140ms timeout, SC70-3 package, no MR input | Designed for 1.8V/2.5V systems; lacks manual reset and higher threshold unsuitable for 1.2V cores | Select only if supervising >1.6V rails and MR functionality is unnecessary |
| TPS3123QDBVRQ1 | 1.05V threshold, 200ms timeout, SOT-23-5, automotive-grade (-40°C to +125°C), no MR | Qualified for automotive use but adds pin for watchdog enable; no manual reset capability | Prefer for AEC-Q100-compliant designs where MR is not required and extended temperature is mandatory |
Compared with MAX6835FXSD3+T, MAX809TRD3+T requires redesign for 1.2V systems due to mismatched threshold and missing MR, while TPS3123QDBVRQ1 offers automotive qualification but sacrifices manual reset and adds complexity with extra control pin.
Availability
MAX6835FXSD3+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT edge nodes, industrial handheld terminals, low-power smart meters, and critical µP power monitoring applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX6835FXSD3+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, mixed-signal, and power management ICs for demanding industrial, computing, and communications applications.
The MAX6832–MAX6840 family delivers ultra-low-voltage reset supervision for sub-1.8V digital systems, targeting portable, battery-operated, and space-constrained embedded designs where size, power, and accuracy are critical.
FAQ
What is the exact reset threshold voltage of MAX6835FXSD3+T?
The MAX6835FXSD3+T has a factory-set reset threshold of 1.050V, specified with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This value is confirmed in the Threshold Suffix Guide (suffix 'F') and Electrical Characteristics table of the official datasheet. The 1.050V threshold ensures precise supervision of 1.2V supply rails with adequate margin against noise and drift.
Does MAX6835FXSD3+T include manual reset functionality?
Yes, MAX6835FXSD3+T includes a debounced manual reset input (MR) on Pin 3. It features an internal 20kΩ pullup resistor to VCC, allowing direct connection of a normally open momentary switch to ground. The internal debounce eliminates the need for external RC filters or firmware handling, making it ideal for field-serviceable portable equipment requiring hardware-initiated recovery.
What is the reset timeout period for MAX6835FXSD3+T?
The MAX6835FXSD3+T provides a fixed 210ms reset active timeout period, corresponding to suffix 'D3' in the Active Timeout Period Guide. This duration is guaranteed over temperature and ensures µP power domains stabilize fully before reset release. The timeout begins when VCC rises above 1.050V or when MR is released, and is generated by an on-chip RC network - no external components required.
Can MAX6835FXSD3+T operate below 1.0V supply voltage?
Yes, MAX6835FXSD3+T guarantees valid reset assertion down to VCC = 0.55V for active-low operation. Below this voltage, the push-pull output transitions to high-impedance, but reset remains asserted until VCC recovers. This capability supports brownout detection in deeply discharged battery scenarios and ensures robust behavior during ultra-low-power sleep modes where supply may dip transiently.
What package type and dimensions does MAX6835FXSD3+T use?
MAX6835FXSD3+T uses the SC70-4 package: a 4-pin surface-mount outline measuring 2.0mm × 2.1mm with 0.65mm lead pitch. This compact footprint is documented in the Pin Configurations section and Maxim's official package drawings. The '+' in the suffix indicates RoHS-compliant, lead-free construction - critical for modern consumer and medical electronics compliance.
MAX6835FXSD3+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:
- 1.665V
- 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
MAX6835FXSD3+T FAQ
1.How can I place an order for MAX6835FXSD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6835FXSD3+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 MAX6835FXSD3+T reliable?
The price and inventory of MAX6835FXSD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6835FXSD3+T is usually 5 days.
3.What payment methods are accepted for MAX6835FXSD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6835FXSD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6835FXSD3+T?
MAX6835FXSD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6835FXSD3+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 MAX6835FXSD3+T?
For technical support, including MAX6835FXSD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6835FXSD3+T requirements.
6.How does Aetrix verify that MAX6835FXSD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6835FXSD3+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 MAX6835FXSD3+T meets industry standards.
7.What is the process for return or replacement of MAX6835FXSD3+T?
All MAX6835FXSD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6835FXSD3+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 MAX6835FXSD3+T part is unused and in its original packaging.
Return procedure for MAX6835FXSD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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