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Analog Devices Inc./Maxim Integrated MAX6839XSD0+
- Part No.:
- MAX6839XSD0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6839XSD0+.pdf
- Description:
- MAX6839 ULTRA-LOW-VOLTAGE VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:1,282
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Product details
Overview
MAX6839XSD0+ from Maxim Integrated is a push-pull, active-high microprocessor supervisory circuit in 4-pin SC70 package, designed to monitor supply voltage via external RESET-IN input with factory-trimmed 444mV threshold and provide reset assertion for ≥1.5ms after threshold breach. It operates from VCC = 1.1V to 3.3V, draws 7.5µA typical supply current, and guarantees valid reset output down to VCC = 0.75V - ideal for low-voltage portable systems requiring precise brownout detection.
For engineers reviewing the MAX6839XSD0+ datasheet, MAX6839XSD0+ pinout, MAX6839XSD0+ application, or MAX6839XSD0+ equivalent, this device serves as a precision adjustable-threshold reset supervisor for sub-1.2V core supplies, supporting manual reset integration, noise-immune transient rejection, and compatibility with bidirectional µP reset pins when paired with open-drain variants.
Technical Context
The MAX6839XSD0+ uses an internal 444mV reference comparator to monitor voltage applied at RESET-IN, asserting active-high RESET when that input falls below threshold. Its reset timeout is fixed at 1.5ms (D1 suffix), with propagation delay under 70µs for D0 variants but extended to ~1.5ms active window here.
VCC powers the IC but is not monitored; instead, RESET-IN enables flexible monitoring of voltages as low as 0.44V using external resistor dividers. The push-pull output drives high with VOH ≥ 0.8×VCC (at ISOURCE = 10µA) and sinks low with VOL ≤ 0.2×VCC (at ISINK = 80µA), ensuring robust interface with modern low-voltage µPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Push-pull, active-high - eliminates need for external pullup and ensures defined logic level during reset assertion |
| RESET-IN Threshold | 444mV ±3.0% over -40°C to +85°C - enables accurate monitoring of supplies down to 0.44V via external divider |
| Reset Timeout Period | 1.5ms - provides sufficient hold time for µP initialization without excessive system delay |
| Supply Voltage Range | VCC = 1.1V to 3.3V - supports operation from I/O rails while monitoring lower-core supplies |
| Supply Current | 7.5µA typical at VCC = 1.2V - minimizes battery drain in always-on supervision circuits |
| Reset Validity Limit | Guaranteed down to VCC = 0.75V - ensures reliable reset assertion even during deep brownout |
| RESET-IN Leakage | ±25nA - permits use of high-value resistors (>100kΩ) in divider networks to reduce power consumption |
Pinout & Package
MAX6839XSD0+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs. Pin 1 is RESET-IN, Pin 2 is VCC, Pin 3 is GND, and Pin 4 is RESET (push-pull, active-high).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET-IN | High-impedance input for external voltage divider; reset asserts when voltage falls below 444mV |
| 2 | VCC | Power supply input (1.1V–3.3V); powers internal circuitry but is not monitored |
| 3 | GND | Ground reference for all internal comparators and output stage |
| 4 | RESET | Push-pull active-high output; drives high during reset, low otherwise - no external pullup required |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable threshold via RESET-IN | Enables precise monitoring of any supply ≥0.44V using two external resistors - no trimming required |
| 1.5ms fixed reset timeout | Ensures µP reset pulse meets minimum duration requirements without software or RC timing components |
| ±3.0% threshold accuracy over temperature | Maintains trip-point stability across industrial temperature range (-40°C to +85°C) |
| Low 7.5µA supply current | Extends battery life in always-connected supervision applications such as wearables and IoT sensors |
| Immunity to short VCC transients | Rejects <100ns negative glitches on VCC - prevents spurious resets in noisy power environments |
Applications
| Battery-Powered Wearables | Low-Voltage FPGA Configuration |
|---|---|
Use Scenario: Supervising 0.85V FPGA core rail during cold-start and battery sag conditions. IC Role / Device Role / Timing Role: Active-high reset supervisor triggered by external divider on RESET-IN, holding FPGA in reset until core voltage stabilizes above 0.85V. Use Value: Prevents configuration corruption by guaranteeing ≥1.5ms reset pulse even when battery drops to 2.8V and core rail sags to 0.78V. |
Use Scenario: Ensuring clean startup of dual-rail FPGA (1.2V I/O, 0.85V core) powered from single DC/DC converter. IC Role / Device Role / Timing Role: Dedicated core-supply monitor using RESET-IN, decoupled from I/O rail fluctuations. Use Value: Eliminates need for separate voltage detector IC - one MAX6839XSD0+ monitors core rail independently while sharing VCC with I/O domain. |
| Medical Sensor Node | Industrial PLC Subsystem |
Use Scenario: Maintaining deterministic reset behavior in ultra-low-power ECG front-end ASIC powered from 1.1V LDO. IC Role / Device Role / Timing Role: Reset generator with 444mV reference, scaled via divider to detect 1.05V trip point on ASIC supply. Use Value: Achieves ±3% trip accuracy over temperature without calibration, reducing BOM count and test complexity. |
Use Scenario: Adding brownout protection to legacy µP-based control module operating from aging 3.3V supply. IC Role / Device Role / Timing Role: External reset monitor interfaced to existing MR line, providing fail-safe reset independent of µP's internal watchdog. Use Value: Adds hardware-level supply monitoring without PCB redesign - RESET output connects directly to µP reset pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6836XSD0+ | Same SC70-4 package and D1 timeout, but features debounced MR input instead of RESET-IN | Used where manual reset button is required; cannot monitor arbitrary low-voltage rails | Select MAX6836XSD0+ only if system requires physical reset button with built-in debounce - not for adjustable-threshold monitoring |
| MAX6316HUT46+T | 460mV fixed threshold, SOT-23-5 package, 1.6s timeout, higher ICC (12µA) | Designed for higher-voltage systems (1.8V–5.5V); lacks RESET-IN flexibility and low-current advantage | Choose MAX6316HUT46+T only for legacy 3.3V/5V designs needing longer timeout - not suitable for sub-1.2V core monitoring |
Compared with MAX6839XSD0+, MAX6836XSD0+ trades RESET-IN adjustability for MR debounce, making it unsuitable for precision low-voltage rail monitoring; MAX6316HUT46+T offers longer timeout but sacrifices threshold accuracy, supply range, and quiescent current - neither matches MAX6839XSD0+'s combination of 444mV reference, 1.5ms timing, and 7.5µA operation in SC70-4.
Availability
MAX6839XSD0+ is available at Aetrix Electronics and suitable for battery-powered wearables, low-voltage FPGA configuration, medical sensor nodes, and industrial PLC subsystems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6839XSD0+ 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 interface applications, with emphasis on high-reliability, low-power solutions.
The MAX6832–MAX6840 family delivers ultra-low-voltage reset supervision for sub-1.2V digital systems, targeting portable, medical, and industrial applications where supply margin is minimal and quiescent current must be minimized.
FAQ
What is the exact reset timeout period for MAX6839XSD0+?
The MAX6839XSD0+ has a fixed reset active timeout period of 1.5ms (D1 suffix), meaning RESET remains asserted for 1.5ms after RESET-IN rises above the 444mV threshold. This value is factory-set and unchangeable - no external capacitor or resistor adjusts it. The 1.5ms duration ensures compatibility with most µP reset timing requirements while avoiding unnecessary system delays.
Does MAX6839XSD0+ monitor its own VCC supply?
No, MAX6839XSD0+ does not monitor VCC. Its VCC pin (Pin 2) supplies power only - the actual voltage monitoring occurs at RESET-IN (Pin 1). This architecture allows MAX6839XSD0+ to supervise a different supply (e.g., a 0.85V core rail) while being powered from a higher, more stable rail like 3.3V or 1.8V. VCC must remain within 1.1V–3.3V for proper operation, but trip point is determined solely by RESET-IN voltage.
Can MAX6839XSD0+ be used with a 0.6V supply rail?
Yes, MAX6839XSD0+ can supervise a 0.6V rail using an external resistor divider on RESET-IN. With VRSTIN = 444mV, a divider ratio of R1/R2 = (0.6V / 0.444V) − 1 ≈ 0.35 yields the correct scaling. For example, R2 = 200kΩ and R1 = 70kΩ achieves ~0.6V trip point. Note that VCC must still be ≥1.1V to guarantee RESET-IN threshold accuracy per the datasheet specifications.
What is the maximum leakage current on the RESET-IN pin of MAX6839XSD0+?
The RESET-IN pin of MAX6839XSD0+ exhibits ±25nA leakage current over temperature (−40°C to +85°C), enabling use of high-value resistors (e.g., >100kΩ) in the external voltage divider without significant error. This low leakage ensures trip-point accuracy remains within ±3.0% even with large R1/R2 values, directly supporting ultra-low-power design goals in battery-operated systems.
Is MAX6839XSD0+ pin-compatible with other devices in the MAX6832–MAX6840 family?
MAX6839XSD0+ shares the same 4-pin SC70-4 footprint with MAX6835XSD0+, MAX6836XSD0+, MAX6837XSD0+, MAX6838XSD0+, and MAX6840XSD0+, but pin functions differ: MAX6839XSD0+ uses Pin 1 for RESET-IN and Pin 4 for active-high RESET, whereas MAX6835/MAX6836/MAX6837 use Pin 1 for GND and Pin 3 for MR. Direct substitution requires schematic and layout review - it is not drop-in compatible with MR-equipped variants.
MAX6839XSD0+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 70µs Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6839XSD0+ FAQ
1.How can I place an order for MAX6839XSD0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6839XSD0+ 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 MAX6839XSD0+ reliable?
The price and inventory of MAX6839XSD0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6839XSD0+ is usually 5 days.
3.What payment methods are accepted for MAX6839XSD0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6839XSD0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6839XSD0+?
MAX6839XSD0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6839XSD0+ 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 MAX6839XSD0+?
For technical support, including MAX6839XSD0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6839XSD0+ requirements.
6.How does Aetrix verify that MAX6839XSD0+ is sourced from the original manufacturer or authorized distributors?
All MAX6839XSD0+ 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 MAX6839XSD0+ meets industry standards.
7.What is the process for return or replacement of MAX6839XSD0+?
All MAX6839XSD0+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6839XSD0+, 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 MAX6839XSD0+ part is unused and in its original packaging.
Return procedure for MAX6839XSD0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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