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Analog Devices Inc./Maxim Integrated MAX6834HXRD2+
- Part No.:
- MAX6834HXRD2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6834HXRD2+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6834HXRD2+ from Maxim Integrated is an ultra-low-voltage, open-drain active-low microprocessor reset circuit in SC70-3 package, designed to monitor +1.313V supply rails with ±2.5% threshold accuracy over temperature and assert reset for 30ms after VCC recovery or manual reset deassertion. It operates down to VCC = 0.55V, consumes only 7.5µA typical supply current, and supports bidirectional µP reset I/O interfacing in portable and battery-powered systems.
For engineers reviewing the MAX6834HXRD2+ datasheet, MAX6834HXRD2+ pinout, MAX6834HXRD2+ application, or MAX6834HXRD2+ equivalent, key selection considerations include its 1.313V factory-set reset threshold, 30ms timeout period (D2 suffix), open-drain RESET output requiring external pullup, guaranteed operation down to 0.55V VCC, and immunity to short negative VCC transients up to 100ns.
Technical Context
The MAX6834HXRD2+ implements a precision voltage comparator with 444mV internal reference and hysteresis of 0.75% of VTH to reject fast VCC transients. Its reset assertion logic responds to VCC falling below 1.313V (H-suffix) and holds RESET low for exactly 30ms after VCC rises above threshold.
This device uses BiCMOS process technology (681 transistors), features no MR pin (3-pin configuration), and relies solely on VCC monitoring-no RESET-IN or manual reset input. The open-drain output enables level-shifting across supply domains and direct interface with bidirectional µP reset pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.313V ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 1.3V-core systems |
| Reset Timeout Period | 30ms (D2 suffix) - guarantees sufficient hold time for µP initialization sequences |
| Supply Current | 7.5µA typical at 1.2V - enables multi-year battery life in always-on monitoring applications |
| VCC Operating Range | 0.55V to 3.6V - supports valid reset assertion during deep power-down to near-zero VCC |
| Output Type | Open-drain active-low RESET - allows flexible pullup to higher voltage rail (up to 6V) for level shifting |
| Package | SC70-3 - 1.25mm × 0.8mm footprint ideal for space-constrained portable PCBs |
| Reset Propagation Delay | 60µs max on VCC fall - provides rapid response to supply collapse without false triggering |
Pinout & Package
MAX6834HXRD2+ is housed in a 3-pin SC70 package (1.25mm × 0.8mm, 0.65mm pitch) with exposed pad option not specified. Pin 1 is GND, Pin 2 is RESET (open-drain active-low), and Pin 3 is VCC. No MR or RESET-IN pins are present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection |
| Pin 2 | RESET | Open-drain active-low output; requires external pullup resistor to define high-level voltage and sink capability |
| Pin 3 | VCC | Monitored supply input and power source; also defines logic thresholds for internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 1.313V threshold (H-suffix) | Eliminates external resistor divider and calibration effort for 1.3V core rail monitoring |
| 30ms fixed reset timeout (D2 suffix) | Matches standard µP power-up timing requirements without external RC timing components |
| 0.55V minimum VCC operation | Ensures reset remains asserted through full power collapse, preventing spurious release |
| 7.5µA typical supply current | Reduces quiescent load on coin-cell or energy-harvesting sources by >50% vs. legacy reset ICs |
| Immunity to 100ns VCC glitches | Prevents false resets in noisy DC/DC converter environments without added filtering |
Applications
| Battery-Powered IoT Sensor Node | Low-Power Wearable MCU System |
|---|---|
Use Scenario: A coin-cell–powered environmental sensor samples data every 5 minutes and transmits via BLE only upon threshold breach. IC Role / Device Role / Timing Role: MAX6834HXRD2+ monitors the 1.3V LDO output powering the MCU and radio, asserting RESET during brownout caused by cold-temperature battery impedance rise. Use Value: Its 7.5µA quiescent current extends 2032 coin-cell life beyond 3 years; 30ms timeout ensures complete MCU state reset before wake-up. |
Use Scenario: An optical heart-rate monitor uses an ARM Cortex-M0+ MCU with 1.3V core supply and shared 3.3V I/O rail. IC Role / Device Role / Timing Role: MAX6834HXRD2+ supervises the 1.3V core domain independently, while its open-drain RESET connects directly to the MCU's bidirectional reset pin pulled to 3.3V. Use Value: Enables single-wire reset arbitration between MCU and external watchdog; eliminates need for level-shifter or additional reset buffer. |
| Industrial Edge Controller Subsystem | Medical Diagnostic Handheld |
Use Scenario: A DIN-rail mounted controller uses isolated DC/DC converters to generate 1.3V core and 3.3V I/O supplies from 24V bus. IC Role / Device Role / Timing Role: MAX6834HXRD2+ monitors the 1.3V rail downstream of the isolation barrier, with RESET pulled up to local 3.3V domain for noise margin. Use Value: Open-drain architecture prevents ground loop issues across isolation boundaries; ±2.5% threshold accuracy ensures consistent trip point across temperature swings. |
Use Scenario: A handheld ultrasound probe contains a low-voltage FPGA fabric powered from a 1.3V regulator, requiring deterministic reset sequencing. IC Role / Device Role / Timing Role: MAX6834HXRD2+ asserts RESET during FPGA configuration voltage ramp and holds for full 30ms to guarantee bitstream integrity. Use Value: Guaranteed 0.55V VCC operation ensures reset remains active until FPGA internal regulators fully stabilize, preventing partial configuration lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6381XR24+T | Push-pull active-low output; 2.4V threshold; 1.5ms timeout; SC70-3 | Requires VCC ≥ 0.75V for valid RESET; no open-drain flexibility | Select when higher threshold and shorter timeout suit 2.4V I/O rail monitoring and board space permits different pinout |
| TPS3123E13DBVR | Open-drain active-low; 1.3V threshold; 200ms timeout; SOT-23-3 | Higher 12µA supply current; wider timeout tolerance (±20%); larger 2.92mm × 1.62mm package | Select when longer timeout is acceptable and SOT-23 footprint compatibility is required over SC70 size reduction |
Compared with MAX6834HXRD2+, MAX6381XR24+T offers tighter reset timing but lacks level-shifting capability, while TPS3123E13DBVR provides longer timeout margin at the cost of higher quiescent current and larger footprint-making MAX6834HXRD2+ optimal for ultra-compact, multi-rail, low-power 1.3V systems.
Availability
MAX6834HXRD2+ is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, low-power wearable MCU systems, and industrial edge controller subsystems requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6834HXRD2+ 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 in demanding industrial, medical, and communications applications.
The MAX6832–MAX6840 family delivers ultra-low-voltage reset supervision for sub-1.8V digital systems, targeting portable, battery-operated, and energy-sensitive embedded devices where minimal quiescent current and small footprint are critical.
FAQ
What is the exact reset threshold voltage of the MAX6834HXRD2+ and how stable is it over temperature?
The MAX6834HXRD2+ has a factory-set reset threshold of 1.313V with ±2.5% accuracy over the full -40°C to +85°C operating range. This specification is guaranteed by design and confirmed in the Electrical Characteristics table of the datasheet. The threshold stability is achieved using a precision bandgap reference and trimmed comparator, ensuring consistent brownout detection across environmental conditions without external calibration. The MAX6834HXRD2+ maintains this accuracy even as VCC declines to 0.55V.
Does the MAX6834HXRD2+ include a manual reset (MR) input or RESET-IN pin?
No, the MAX6834HXRD2+ does not include a manual reset (MR) input or RESET-IN pin. As a 3-pin SC70 device in the MAX6834 series, it is configured exclusively for VCC monitoring with no provision for external reset initiation or adjustable threshold. Its pinout consists only of GND (Pin 1), RESET (Pin 2, open-drain active-low), and VCC (Pin 3). This simplifies layout and reduces BOM count for applications requiring only supply-voltage supervision.
What pullup resistor value is recommended for the open-drain RESET output of the MAX6834HXRD2+?
The MAX6834HXRD2+ datasheet does not specify a single recommended pullup resistor value, as the choice depends on system voltage, speed, and drive strength requirements. For typical 3.3V pullup with moderate rise time and low power, 10kΩ to 100kΩ is commonly used. The device guarantees RESET sink capability of 200µA at VCC ≥ 1.5V (VOL ≤ 0.2V), so a 47kΩ resistor yields ~70µA sink current and <1µs rise time into 10pF load. Higher values reduce current but increase susceptibility to noise.
Can the MAX6834HXRD2+ be used to monitor a supply voltage lower than 1.313V, such as 1.0V or 0.9V?
No-the MAX6834HXRD2+ is factory-trimmed to monitor only 1.313V (H-suffix) and cannot be adjusted. To supervise lower voltages like 1.0V or 0.9V, select a variant with appropriate suffix (e.g., MAX6834FXRD2+ for 1.050V) or use the RESET-IN–capable MAX6838/MAX6839/MAX6840 series with external resistor divider. Attempting to use MAX6834HXRD2+ on sub-threshold rails results in permanent reset assertion, as VCC never exceeds the 1.313V trip point.
Is the MAX6834HXRD2+ pin-compatible with older Maxim reset ICs like the MAX809 or MAX6381 series?
No, the MAX6834HXRD2+ is not pin-compatible with MAX809 (SOT-23-3, push-pull) or MAX6381 (SC70-3, push-pull) despite sharing the same 3-pin SC70-3 package outline. Its Pin 2 is open-drain RESET, whereas MAX809/MAX6381 use push-pull outputs-requiring redesign of pullup network and logic interpretation. The MAX6834HXRD2+ is pin-compatible only with other MAX6832–MAX6837 SC70-3 variants sharing the same open-drain output configuration (e.g., MAX6834VXRD2+, MAX6834FXRD2+).
MAX6834HXRD2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.665V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6834HXRD2+ FAQ
1.How can I place an order for MAX6834HXRD2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6834HXRD2+ 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 MAX6834HXRD2+ reliable?
The price and inventory of MAX6834HXRD2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6834HXRD2+ is usually 5 days.
3.What payment methods are accepted for MAX6834HXRD2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6834HXRD2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6834HXRD2+?
MAX6834HXRD2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6834HXRD2+ 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 MAX6834HXRD2+?
For technical support, including MAX6834HXRD2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6834HXRD2+ requirements.
6.How does Aetrix verify that MAX6834HXRD2+ is sourced from the original manufacturer or authorized distributors?
All MAX6834HXRD2+ 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 MAX6834HXRD2+ meets industry standards.
7.What is the process for return or replacement of MAX6834HXRD2+?
All MAX6834HXRD2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6834HXRD2+, 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 MAX6834HXRD2+ part is unused and in its original packaging.
Return procedure for MAX6834HXRD2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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