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Analog Devices Inc./Maxim Integrated MAX6834FXRD3+
- Part No.:
- MAX6834FXRD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6834FXRD3+.pdf
- Description:
- IC MPU SUPERVISOR SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,452
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Product details
Overview
MAX6834FXRD3+ from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in SC70-3 package, designed to monitor +1.05V supply (F-threshold), assert reset for 210ms (D3 timeout), and operate down to VCC = 0.55V. It features 7.5µA typical supply current, ±2.5% threshold accuracy over temperature, and immunity to short negative VCC transients - used in portable battery-powered systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6834FXRD3+ datasheet, MAX6834FXRD3+ pinout, MAX6834FXRD3+ application, or MAX6834FXRD3+ equivalent, key selection criteria include its open-drain RESET output compatibility with bidirectional µP reset pins, adjustable pullup voltage capability (up to +6V), guaranteed reset validity to 0.55V, and factory-set 1.05V threshold with 210ms timeout - critical for low-power embedded control and sensor node designs.
Technical Context
The MAX6834FXRD3+ implements a precision bandgap-based voltage comparator with 444mV internal reference, comparing VCC directly to a factory-trimmed 1.05V threshold. Its reset assertion logic is triggered solely by VCC falling below threshold or manual reset (MR) activation, with no RESET-IN functionality - distinguishing it from MAX6838–MAX6840 variants.
Reset deassertion follows a fixed 210ms timeout after VCC rises above threshold; the open-drain output requires an external pullup resistor and supports level-shifting across supply domains. The device uses BiCMOS process (681 transistors), guarantees operation from -40°C to +85°C, and maintains reset assertion even as VCC declines to 0.55V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.05V ±2.5% - precisely monitors 1.05V nominal supplies; enables stable reset at ultra-low core voltages. |
| Reset Timeout Period | 210ms - ensures µP remains held in reset long enough for full power stabilization after brownout recovery. |
| Supply Current | 7.5µA (typ) at 1.2V - minimizes quiescent drain on coin-cell or energy-harvesting power sources. |
| Operating Voltage Range | 0.55V to 3.6V - guarantees valid reset assertion down to 0.55V VCC, supporting deep brownout detection. |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration, bidirectional µP reset pin interfacing, and level-shifting up to +6V. |
| Package | SC70-3 - 1.25mm × 2.0mm footprint ideal for space-constrained portable and wearable PCBs. |
| Temperature Range | -40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
MAX6834FXRD3+ is housed in a 3-pin SC70-3 package (1.25mm × 2.0mm, 0.65mm pitch), with GND and VCC on opposite ends and RESET centered - optimized for minimal board area and high-density layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane. |
| 2 | RESET | Open-drain active-low output; requires external pullup (to VCC or higher voltage); sinks ≥200µA when asserted. |
| 3 | VCC | Monitored supply input and power source; also defines operating range (0.55V–3.6V); bypass capacitor recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.05V reset threshold | Eliminates external resistor networks and calibration; supports direct integration with 1.05V LDO outputs. |
| 210ms fixed reset timeout | Ensures sufficient hold time for slow-ramping power rails and clock domain stabilization before µP release. |
| 7.5µA supply current | Extends battery life in always-on monitoring circuits; enables multi-year operation on CR2032 cells. |
| ±2.5% threshold accuracy over temperature | Guarantees consistent trip point across -40°C to +85°C without derating or margining. |
| Immunity to short negative VCC transients | Rejects <100ns glitches up to 200mV overdrive - prevents spurious resets in noisy power environments. |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
|
Use Scenario: Wearable ECG patch powered by single Li-SOCl₂ cell with 1.05V regulated rail. IC Role / Device Role / Timing Role: Monitors 1.05V core supply and asserts open-drain RESET to ARM Cortex-M0+ during brownout, holding processor until rail stabilizes post-battery sag. Use Value: 210ms timeout prevents premature firmware execution; 7.5µA quiescent current extends operational life beyond 5 years. |
Use Scenario: Wireless vibration sensor node deployed in factory machinery with intermittent 1.05V energy-harvesting supply. IC Role / Device Role / Timing Role: Acts as primary power supervisor, asserting RESET to ESP32-WROOM-32 when harvested voltage dips below 1.05V during mechanical shock events. Use Value: Open-drain output interfaces directly with ESP32's bidirectional reset pin using shared 3.3V pullup - eliminating level translators. |
| Low-Power Smart Meters | Automotive Body Control Modules |
|
Use Scenario: AMI smart meter with dual-supply architecture: 1.05V MCU core and 3.3V RF transceiver. IC Role / Device Role / Timing Role: Supervises 1.05V rail only; RESET output pulled up to 3.3V to drive both MCU and transceiver reset lines simultaneously. Use Value: Level-shifting capability enables single reset signal coordination across voltage domains without additional logic. |
Use Scenario: Door module MCU powered by 1.05V buck converter fed from vehicle battery (9V–16V). IC Role / Device Role / Timing Role: Detects undervoltage during cold-crank (battery dip to 6V) causing 1.05V rail collapse; asserts RESET to prevent corrupted EEPROM writes. Use Value: Guaranteed reset assertion down to 0.55V VCC ensures fail-safe behavior even during severe brownout conditions. |
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. | Designed for higher-voltage systems (2.2V rail); lacks open-drain flexibility and level-shifting capability. | Select when 2.2V monitoring and simpler push-pull interface suffice; not suitable for 1.05V or multi-rail coordination. |
| TPS3123E10DBVR | Open-drain active-low RESET, 1.0V threshold, 200ms timeout, SOT-23-3 package. | Lower threshold tolerance (±3%), wider timeout tolerance (±30%), larger SOT-23 footprint (2.9mm × 1.6mm vs. SC70-3's 2.0mm × 1.25mm). | Choose for TI ecosystem alignment or where ±3% threshold accuracy is acceptable; verify PCB land pattern compatibility. |
Compared with MAX6834FXRD3+, MAX6381XR22+T offers simpler drive but cannot level-shift or support sub-1.2V rails, while TPS3123E10DBVR matches threshold closely but trades precision and size for broader vendor availability - making MAX6834FXRD3+ optimal for space-constrained, ultra-low-voltage, multi-rail designs demanding tight accuracy.
Availability
MAX6834FXRD3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, low-power smart meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6834FXRD3+ 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 designed specifically for ultra-low-voltage microprocessor supervision in battery-powered and energy-constrained systems, emphasizing minimal quiescent current, small footprint, and precise reset thresholds from 1.05V to 1.665V.
FAQ
What is the exact reset threshold voltage of the MAX6834FXRD3+ and how tightly is it specified?
The MAX6834FXRD3+ has a factory-set reset threshold of 1.05V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This specification is confirmed in the Electrical Characteristics table of the official datasheet (Rev 2, 12/05), where the F-suffix corresponds to 1.020V (min), 1.050V (typ), and 1.080V (max) at TA = -40°C to +85°C. The MAX6834FXRD3+ does not use external resistors or RESET-IN adjustment - the threshold is laser-trimmed and fixed.
Does the MAX6834FXRD3+ support manual reset (MR) functionality?
No, the MAX6834FXRD3+ does not include a manual reset (MR) input. As confirmed in the Pin Description section (page 5) and Selector Guide, only MAX6835/MAX6836/MAX6837 (XSD variants) and MAX6838–MAX6840 (XSD variants) feature MR or RESET-IN pins. The MAX6834FXRD3+ is a 3-pin SC70-3 device with pins GND, RESET, and VCC only - it relies solely on VCC monitoring for reset assertion.
What is the purpose of the open-drain RESET output on the MAX6834FXRD3+ and what pullup voltage can be used?
The open-drain RESET output on the MAX6834FXRD3+ enables wired-OR reset bus configurations, bidirectional µP reset pin interfacing (as shown in Figure 4), and level-shifting across supply domains. The datasheet explicitly permits connecting the pullup resistor to any voltage between 0V and +6.0V - including supplies higher than VCC (e.g., 3.3V or 5V) - allowing the same RESET signal to drive multiple devices with different I/O voltage requirements.
How does the MAX6834FXRD3+ behave when VCC falls below 0.55V?
Below 0.55V, the MAX6834FXRD3+ ceases to actively sink current on the RESET pin - the output transitions to a high-impedance state. However, because RESET is open-drain, an external pullup resistor will drive it HIGH as VCC collapses. To maintain a defined LOW state down to 0V (e.g., for systems requiring guaranteed reset at zero supply), a pulldown resistor (e.g., 100kΩ to GND) is recommended - as documented in Figure 3 of the datasheet.
Is the MAX6834FXRD3+ pin-compatible with other members of the MAX6832–MAX6840 family?
Yes, the MAX6834FXRD3+ shares identical SC70-3 pinout (GND, RESET, VCC) with MAX6832 and MAX6833 variants - all three are pin-compatible within the 3-pin subgroup. However, it is not pin-compatible with 4-pin variants (e.g., MAX6835/MAX6836/MAX6837/MAX6838–MAX6840), nor with legacy families like MAX809 or MAX6712, despite functional similarity. Pin compatibility is explicitly stated in the datasheet's "Pin Configurations" section (page 9) and "Pin Description" table (page 5).
MAX6834FXRD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.665V
- 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-70-3
MAX6834FXRD3+ FAQ
1.How can I place an order for MAX6834FXRD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6834FXRD3+ 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 MAX6834FXRD3+ reliable?
The price and inventory of MAX6834FXRD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6834FXRD3+ is usually 5 days.
3.What payment methods are accepted for MAX6834FXRD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6834FXRD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6834FXRD3+?
MAX6834FXRD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6834FXRD3+ 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 MAX6834FXRD3+?
For technical support, including MAX6834FXRD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6834FXRD3+ requirements.
6.How does Aetrix verify that MAX6834FXRD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6834FXRD3+ 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 MAX6834FXRD3+ meets industry standards.
7.What is the process for return or replacement of MAX6834FXRD3+?
All MAX6834FXRD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6834FXRD3+, 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 MAX6834FXRD3+ part is unused and in its original packaging.
Return procedure for MAX6834FXRD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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