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Analog Devices Inc./Maxim Integrated MAX6834VXRD3+
- Part No.:
- MAX6834VXRD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6834VXRD3+.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, FI
- Quantity:
- Payment:
- Shipping:
Inventory:5,025
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Product details
Overview
MAX6834VXRD3+ from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with open-drain active-low reset output, 1.575V factory-set reset threshold, and 210ms reset timeout period. It monitors +1.2V to +1.8V supply rails in portable and battery-powered systems, asserting reset during power-up, brownout, or manual reset events. Designed for SC70-3 packaging, it delivers ±2.5% threshold accuracy over temperature and operates down to VCC = 0.55V.
For engineers reviewing the MAX6834VXRD3+ datasheet, MAX6834VXRD3+ pinout, MAX6834VXRD3+ application, or MAX6834VXRD3+ equivalent, key selection considerations include its open-drain RESET interface for bidirectional µP reset I/O, immunity to short negative VCC transients, low 7.5µA typical supply current, and compatibility with multi-supply level-shifting configurations.
Technical Context
The MAX6834VXRD3+ implements a precision voltage comparator with 444mV internal reference, comparing VCC against a factory-trimmed threshold (1.575V) to trigger reset assertion when supply drops below specification. Its reset logic includes fixed 210ms timeout after VCC recovery and guarantees valid reset output down to VCC = 0.55V.
As a member of the MAX6832–MAX6840 family, it uses BiCMOS process technology (681 transistors), features no external component requirements for basic operation, and excludes manual reset (MR) or RESET-IN inputs-distinguishing it from SC70-4 variants like MAX6835/MAX6837/MAX6838.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±2.5% over -40°C to +85°C - ensures reliable reset assertion across temperature for 1.6V nominal supplies |
| Reset Timeout Period | 210ms - provides sufficient hold time for µP initialization after power stabilization |
| Supply Current | 7.5µA typical at VCC = 1.2V - enables multi-year battery life in always-on portable monitoring circuits |
| Operating Voltage Range | +0.55V to +3.6V - supports operation during deep brownout and allows use with sub-1V logic domains |
| Output Type | Open-drain active-low RESET - enables wired-OR configuration and level-shifting to higher-voltage reset domains |
| Package | SC70-3 - 1.25mm × 0.85mm footprint ideal for space-constrained handheld and wearable designs |
| Reset Validity Limit | VCC ≥ 0.55V - guarantees RESET remains actively driven low until supply falls below critical logic threshold |
Pinout & Package
MAX6834VXRD3+ is housed in a 3-pin SC70 package (1.25mm × 0.85mm, 0.65mm pitch), with pins arranged as GND (Pin 1), RESET (Pin 2), and VCC (Pin 3) in top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| RESET | Open-drain active-low reset output | Requires external pullup resistor (to VCC or higher voltage); sinks current only when asserted; enables bidirectional reset arbitration |
| VCC | Supply and monitored voltage input | Both powers the IC and serves as the monitored rail; minimum operating voltage is 0.55V; maximum is 3.6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.575V threshold | Eliminates external resistor divider and calibration effort for 1.6V core supply monitoring |
| 210ms reset timeout | Meets JEDEC JESD79-4B tRST requirement for DDR4 memory initialization and ensures full µP boot sequence completion |
| 7.5µA supply current | Reduces quiescent power in always-on battery-backed real-time clocks and sensor wake-up supervisors |
| ±2.5% threshold accuracy | Guarantees deterministic reset behavior across industrial temperature range without derating margins |
| Open-drain RESET with 0.2V VOL @ 200µA | Ensures clean logic-low assertion into high-capacitance µP reset lines and supports mixed-voltage system integration |
Applications
| Battery-Powered Wearables | Low-Voltage Microcontroller Systems |
|---|---|
|
Use Scenario: Continuous heart-rate monitoring in coin-cell-powered fitness trackers requiring >3-year battery life and robust brownout recovery. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M0+ MCU during Li-ion battery discharge from 1.8V to 1.2V. Use Value: 7.5µA quiescent current extends operational lifetime; 210ms timeout prevents premature firmware execution before voltage stabilization. |
Use Scenario: Power management in industrial IoT edge nodes using 1.35V FPGA configuration and 1.2V SoC core rails. IC Role / Device Role / Timing Role: Voltage detector monitoring 1.35V domain and generating synchronized reset pulse to both FPGA and SoC via shared open-drain bus. Use Value: Open-drain output enables single-pullup wired-OR reset distribution; 1.575V threshold matches 1.35V rail with 15% headroom for ripple tolerance. |
| Portable Medical Sensors | Energy-Harvesting Edge Devices |
|
Use Scenario: ECG patch with supercapacitor backup, where supply dips to 1.1V during wireless transmission bursts. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown and nonvolatile state save before VCC falls below 1.1V logic threshold. Use Value: Valid reset assertion down to 0.55V ensures deterministic shutdown even during rapid capacitor discharge; ±2.5% accuracy prevents false resets from supply ripple. |
Use Scenario: Solar-harvested sensor node powering 1.6V MCU from variable 1.2–1.8V storage capacitor. IC Role / Device Role / Timing Role: Reset supervisor enabling safe boot only when harvested energy exceeds 1.575V, preventing unstable operation at marginal voltages. Use Value: Factory-trimmed threshold eliminates need for trimming resistors in ultra-low-BOM-count energy harvesting designs; SC70-3 footprint minimizes PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6832VXRD3+ | Same SC70-3 package and 210ms timeout, but 1.665V reset threshold - 90mV higher than MAX6834VXRD3+ | Suitable for 1.7V/1.8V supply monitoring instead of 1.6V domain; not interchangeable without supply voltage verification | Select when monitoring 1.7V+ rails; requires layout review if replacing MAX6834VXRD3+ due to threshold mismatch |
| MAX6381XR24+T | SC70-3, 1.575V threshold, 200ms timeout, push-pull active-low RESET - differs in output drive architecture and timing | Lacks open-drain flexibility; cannot interface directly with bidirectional µP reset pins or level-shift to higher voltages | Choose for simpler single-supply systems where push-pull drive suffices and 10ms shorter timeout is acceptable |
Compared with MAX6834VXRD3+, MAX6832VXRD3+ offers higher threshold for tighter 1.7V supply margining, while MAX6381XR24+T trades open-drain versatility for lower output impedance and reduced BOM count-neither is pin-compatible, and all require schematic validation for replacement.
Availability
MAX6834VXRD3+ is available at Aetrix Electronics and suitable for battery-powered wearables, portable medical sensors, low-voltage microcontroller systems, and energy-harvesting edge devices requiring stable component supply across extended production lifecycles.
Supply support for MAX6834VXRD3+ 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 management, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX6832–MAX6840 product line delivers ultra-low-power, small-footprint supervisory circuits optimized for sub-1.8V digital systems-specifically targeting portable, battery-critical, and space-constrained embedded applications.
FAQ
What is the reset threshold voltage of the MAX6834VXRD3+ and how accurate is it over temperature?
The MAX6834VXRD3+ has a factory-set reset threshold of 1.575V with ±2.5% accuracy over the full -40°C to +85°C operating temperature range. This specification is guaranteed by design and verified across production lots, ensuring consistent brownout detection for 1.6V nominal supplies without external calibration. The MAX6834VXRD3+ achieves this using an internal 444mV reference and laser-trimmed resistor network.
Does the MAX6834VXRD3+ include a manual reset (MR) input or RESET-IN pin?
No, the MAX6834VXRD3+ does not include a manual reset (MR) input or RESET-IN pin. It is a 3-pin SC70 device (GND, RESET, VCC) designed exclusively for VCC-monitored reset generation. MR functionality is present only on 4-pin variants like MAX6835/MAX6836/MAX6837, and RESET-IN capability is exclusive to MAX6838/MAX6839/MAX6840. The MAX6834VXRD3+ relies solely on supply voltage monitoring.
What pullup resistor value is recommended for the open-drain RESET output of the MAX6834VXRD3+?
A 10kΩ to 100kΩ pullup resistor is recommended for the MAX6834VXRD3+ open-drain RESET output, depending on bus capacitance and rise-time requirements. For standard µP interfaces with ≤50pF load, 47kΩ to 100kΩ provides optimal noise immunity and current efficiency. The MAX6834VXRD3+ can sink up to 200µA while maintaining VOL ≤ 0.2V, supporting robust logic-level translation across supply domains.
Can the MAX6834VXRD3+ operate with supply voltages below 1.2V?
Yes, the MAX6834VXRD3+ operates with VCC as low as 0.55V and asserts valid reset down to that level. However, its 1.575V reset threshold means it will trigger reset well before reaching 0.55V-typically when VCC falls below 1.575V. Operation below 1.2V is supported for brownout detection and controlled shutdown sequencing, but functional reset assertion occurs at the threshold voltage, not at the minimum supply rating.
Is the MAX6834VXRD3+ pin-compatible with older Maxim reset supervisors like the MAX809?
No, the MAX6834VXRD3+ is not pin-compatible with MAX809-series devices. While the MAX6832–MAX6840 family is documented as *functionally* compatible with MAX803/MAX809/MAX810 in certain configurations, the MAX6834VXRD3+ uses SC70-3 packaging with GND/RESET/VCC pinout, whereas MAX809 uses SOT23-3 with VCC/GND/RESET ordering. Direct replacement requires PCB redesign; the MAX6834VXRD3+ shares pinout only with other MAX6832–MAX6837 SC70-3 variants.
MAX6834VXRD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- 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
MAX6834VXRD3+ FAQ
1.How can I place an order for MAX6834VXRD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6834VXRD3+ 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 MAX6834VXRD3+ reliable?
The price and inventory of MAX6834VXRD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6834VXRD3+ is usually 5 days.
3.What payment methods are accepted for MAX6834VXRD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6834VXRD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6834VXRD3+?
MAX6834VXRD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6834VXRD3+ 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 MAX6834VXRD3+?
For technical support, including MAX6834VXRD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6834VXRD3+ requirements.
6.How does Aetrix verify that MAX6834VXRD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6834VXRD3+ 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 MAX6834VXRD3+ meets industry standards.
7.What is the process for return or replacement of MAX6834VXRD3+?
All MAX6834VXRD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6834VXRD3+, 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 MAX6834VXRD3+ part is unused and in its original packaging.
Return procedure for MAX6834VXRD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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