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Analog Devices Inc./Maxim Integrated MAX6839XSD3+T
- Part No.:
- MAX6839XSD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6839XSD3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,470
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Product details
Overview
MAX6839XSD3+T from Maxim Integrated is a push-pull, active-high microprocessor reset circuit in SC70-4 package, designed to monitor adjustable reset thresholds via RESET-IN pin with 444mV internal reference, 210ms reset timeout, and guaranteed operation down to VCC = 0.75V. It supports low-voltage systems (1.1V–3.3V VCC) and delivers 7.5µA typical supply current for battery-powered applications.
For engineers reviewing the MAX6839XSD3+T datasheet, MAX6839XSD3+T pinout, MAX6839XSD3+T application, or MAX6839XSD3+T equivalent, key selection criteria include its RESET-IN adjustability, active-high push-pull output, 210ms timeout, ±3.0% threshold accuracy over temperature, and immunity to short VCC transients.
Technical Context
The MAX6839XSD3+T uses an internal 444mV precision reference to compare externally divided monitored voltage at RESET-IN; reset asserts when RESET-IN falls below this threshold. Its push-pull active-high RESET output drives high during fault conditions and remains asserted for exactly 210ms after RESET-IN recovers.
VCC must be ≥1.1V to guarantee RESET-IN threshold accuracy; the device draws only 7.5µA at 1.8V and maintains valid reset assertion down to VCC = 0.75V. It features no internal MR input-RESET-IN serves as the sole trigger source, eliminating manual reset circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Push-pull, active-high - drives logic HIGH during reset; no external pullup required. |
| Reset Timeout Period | 210ms - fixed delay ensures µP reset hold time meets boot initialization requirements. |
| RESET-IN Threshold | 444mV ±3.0% - stable reference enabling precise external voltage monitoring down to ~0.44V. |
| Supply Voltage Range | 1.1V to 3.3V - supports modern ultra-low-voltage I/O and core domains without level-shifting. |
| Supply Current | 7.5µA (typ) at 1.8V - enables multi-year battery life in always-on portable instrumentation. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin-edge environments. |
| Reset Validity Limit | VCC ≥ 0.75V - guarantees RESET output remains valid through deep brownout conditions. |
Pinout & Package
MAX6839XSD3+T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET-IN | High-impedance input for external resistive divider; sets trip point using 444mV internal reference. |
| 2 | VCC | Power supply input (1.1V–3.3V); powers internal circuitry and defines operating range. |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection for noise immunity. |
| 4 | RESET | Push-pull active-high output; drives HIGH during reset assertion; sinks/source up to 200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enabled via RESET-IN pin and external resistor divider; supports custom trip points from 0.44V upward. |
| Fixed 210ms Timeout | Guaranteed minimum reset pulse width ensures reliable µP boot sequence completion. |
| Low 7.5µA Supply Current | Minimizes quiescent power draw in always-on monitoring circuits and battery-backed systems. |
| ±3.0% Threshold Accuracy | Maintains trip-point stability across -40°C to +85°C, critical for robust system-level brownout response. |
| Immunity to Short VCC Transients | Rejects sub-microsecond negative glitches on VCC, preventing spurious resets in noisy environments. |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
|
Use Scenario: Wearable ECG sensor continuously monitors battery voltage and asserts reset if supply drops below safe operating level during wireless transmission. IC Role / Device Role / Timing Role: Voltage supervisor triggering controlled shutdown before data corruption occurs; 210ms timeout aligns with BLE stack recovery window. Use Value: Prevents firmware lockup by ensuring µC resets cleanly before brownout-induced memory corruption. |
Use Scenario: Remote vibration monitor powered by energy-harvesting circuitry experiences intermittent low-VCC events due to variable ambient light. IC Role / Device Role / Timing Role: Adjustable-threshold supervisor using RESET-IN to track harvested rail; 444mV reference enables accurate 1.2V trip with minimal divider current. Use Value: Enables reliable wake-up/reset coordination without external ADC or comparator, reducing BOM count and power overhead. |
| Battery-Powered Smart Meters | Low-Voltage FPGA Configuration Circuits |
|
Use Scenario: AMI meter operates from Li-SOCl₂ primary cell; voltage decays slowly over 15 years, requiring precise end-of-life detection. IC Role / Device Role / Timing Role: Supervisor configured for 1.1V trip via RESET-IN divider; 210ms reset pulse initiates graceful firmware save before power loss. Use Value: Eliminates need for discrete voltage reference and comparator, cutting cost while improving long-term threshold drift performance. |
Use Scenario: FPGA configuration flash requires stable 1.2V core supply; supervisor monitors VCC rail and holds FPGA in reset until rail stabilizes post-power-up. IC Role / Device Role / Timing Role: Active-high push-pull RESET directly interfaces FPGA's active-high PROG_B or INIT_B pin without level translation. Use Value: Guarantees FPGA remains held in reset until VCC exceeds 0.75V and stays above trip point for full 210ms, preventing partial configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6836XSD3+T | Push-pull active-high output, but triggered by VCC (not RESET-IN); fixed factory-set threshold (e.g., 1.575V). | Suitable for direct VCC monitoring only; lacks external adjustability and requires matching supply voltage to threshold suffix. | Select when monitoring native VCC rail without divider network; avoid when custom trip point or sub-1.2V monitoring is needed. |
| TLV809KDBZR | Active-high push-pull reset IC with 200ms timeout and 1.63V fixed threshold; 3-pin SOT-23 package; 1.5µA supply current. | No RESET-IN pin; no adjustable threshold; lower supply current but limited to higher-voltage rails (≥1.63V). | Choose for ultra-low-power, fixed-threshold applications where board space permits SOT-23 and trip point matches system VCC. |
Compared with MAX6839XSD3+T, MAX6836XSD3+T offers simpler VCC-only supervision but forfeits external adjustability, while TLV809KDBZR reduces quiescent current significantly but restricts use to ≥1.63V supplies and eliminates threshold customization-making MAX6839XSD3+T uniquely suited for precision low-voltage monitoring with design flexibility.
Availability
MAX6839XSD3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, battery-powered smart meters, low-voltage FPGA configuration circuits, and critical µP power monitoring requiring stable component supply across extended product lifecycles.
Supply support for MAX6839XSD3+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 and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and communications systems.
The MAX6832–MAX6840 family delivers ultra-low-voltage reset supervision for battery-powered and energy-constrained systems, emphasizing minimal supply current, small SC70 packaging, and flexible threshold configuration methods.
FAQ
What is the function of the RESET-IN pin on the MAX6839XSD3+T?
The RESET-IN pin on the MAX6839XSD3+T serves as the input to the internal reset comparator, referenced to a precise 444mV internal voltage. When an external resistive divider applies a voltage below this threshold to RESET-IN, the device asserts its active-high RESET output for 210ms. This architecture allows the MAX6839XSD3+T to monitor any supply rail-including those below 1.1V-as long as VCC itself remains within 1.1V–3.3V.
Does the MAX6839XSD3+T have a manual reset (MR) input?
No, the MAX6839XSD3+T does not include a manual reset (MR) input. Unlike MAX6835/MAX6836/MAX6837 variants, the MAX6839XSD3+T relies exclusively on the RESET-IN pin for reset initiation. Its pinout consists of RESET-IN, VCC, GND, and RESET only-eliminating MR functionality to simplify design where external reset triggering is unnecessary.
What is the minimum VCC required for guaranteed RESET-IN threshold accuracy in the MAX6839XSD3+T?
The MAX6839XSD3+T requires VCC ≥ 1.1V to guarantee RESET-IN threshold accuracy within ±3.0% over temperature. Below 1.1V, the internal 444mV reference may deviate beyond specification, compromising trip-point reliability. However, the device continues to operate and assert RESET as long as VCC remains ≥ 0.75V, ensuring functional reset validity deeper into brownout conditions.
Can the MAX6839XSD3+T be used to monitor a 0.8V supply rail?
Yes, the MAX6839XSD3+T can monitor a 0.8V rail using an external resistive divider on RESET-IN. For example, setting R1 = 100kΩ and R2 = 55.6kΩ yields a trip point of 0.8V (0.8V × 444mV/0.8V ≈ 444mV at RESET-IN). The key constraint is that VCC must remain ≥1.1V to maintain reference accuracy; the monitored rail itself may be as low as ~0.44V depending on divider ratio.
What is the purpose of the +T suffix in MAX6839XSD3+T?
Within Maxim Integrated's ordering nomenclature, the +T suffix in MAX6839XSD3+T indicates lead-free, RoHS-compliant packaging in tape-and-reel format. The "+" denotes compliance with environmental regulations, while "T" specifies tape-and-reel delivery-standard for all MAX6832–MAX6840 devices. This variant replaces legacy -T (leaded) versions and is fully compatible in footprint and electrical behavior.
MAX6839XSD3+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:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6839XSD3+T FAQ
1.How can I place an order for MAX6839XSD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6839XSD3+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 MAX6839XSD3+T reliable?
The price and inventory of MAX6839XSD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6839XSD3+T is usually 5 days.
3.What payment methods are accepted for MAX6839XSD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6839XSD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6839XSD3+T?
MAX6839XSD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6839XSD3+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 MAX6839XSD3+T?
For technical support, including MAX6839XSD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6839XSD3+T requirements.
6.How does Aetrix verify that MAX6839XSD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6839XSD3+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 MAX6839XSD3+T meets industry standards.
7.What is the process for return or replacement of MAX6839XSD3+T?
All MAX6839XSD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6839XSD3+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 MAX6839XSD3+T part is unused and in its original packaging.
Return procedure for MAX6839XSD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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