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Analog Devices Inc./Maxim Integrated MAX6838XSD3-T
- Part No.:
- MAX6838XSD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6838XSD3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
MAX6838XSD3-T from Maxim Integrated is a precision ultra-low-voltage microprocessor reset circuit with adjustable threshold via RESET-IN pin, push-pull active-high RESET output, 210ms reset timeout period (D3 suffix), ±3.0% RESET-IN threshold accuracy over temperature, and 7.5µA typical supply current - used for reliable power-on reset and brownout protection in 1.2V–1.8V core supply monitoring applications.
For engineers reviewing the MAX6838XSD3-T datasheet, MAX6838XSD3-T pinout, MAX6838XSD3-T application, or MAX6838XSD3-T equivalent, this page delivers verified functional identity, SC70-4 package mapping, exact reset timing and threshold behavior, true alternative part comparisons, and design-critical interface guidance for low-voltage µP supervision.
Technical Context
The MAX6838XSD3-T implements a high-impedance comparator architecture that monitors an externally derived voltage at the RESET-IN pin (typical threshold = 444mV), not VCC directly. It asserts RESET when RESET-IN falls below threshold and holds it active for exactly 210ms after RESET-IN rises above threshold.
Its push-pull active-high RESET output drives logic-high during reset assertion, sinking no current when inactive, and operates down to VCC = 1.1V with guaranteed timing and threshold accuracy - unlike VCC-monitored variants which require ≥0.55V for reset validity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 210ms - fixed delay ensures sufficient µP initialization time after monitored supply stabilizes |
| RESET-IN Threshold | 444mV ±3.0% - stable reference enabling precise external voltage monitoring down to ~0.44V input |
| Supply Current | 7.5µA (typ) at 1.2V - enables multi-year battery life in portable systems without compromising reset reliability |
| VCC Operating Range | 1.1V to 3.3V - supports wide input supply range while maintaining RESET-IN accuracy and timing integrity |
| Output Type | Push-pull active-high - eliminates need for external pullup and ensures defined logic level during reset assertion |
| Reset Validity Voltage | Guaranteed to VCC = 0.75V - maintains valid RESET signal even during deep brownout conditions |
| RESET-IN Leakage | ±25nA - permits use of megaohm-level resistor dividers for minimal quiescent power consumption |
Pinout & Package
MAX6838XSD3-T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable and embedded designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET-IN | High-impedance analog input for external resistive divider; sets reset trip point by scaling monitored voltage to 444mV reference |
| 2 | VCC | Power supply input (1.1V–3.3V); powers internal circuitry and defines operating voltage for RESET output drive strength |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to ensure accurate threshold comparison |
| 4 | RESET | Push-pull active-high output; drives HIGH during reset assertion and floats HIGH when inactive - no external pullup required |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enabled via RESET-IN pin with 444mV internal reference - allows monitoring of any supply ≥0.44V using external resistor divider |
| Fixed 210ms Reset Timeout | Guaranteed timing independent of temperature, supply, or load - ensures consistent µP boot sequence across operating conditions |
| Low 7.5µA Supply Current | Reduces system standby power by >90% vs. discrete supervisor solutions - critical for coin-cell and energy-harvesting applications |
| Immunity to VCC Transients | Rejects negative-going glitches <100ns at 200mV overdrive - prevents spurious resets in noisy power environments |
| SC70-4 Footprint Compatibility | Matches industry-standard 4-pin SC70 layout - enables drop-in replacement in existing PCB designs without rework |
Applications
| Portable Medical Sensors | Wearable Health Monitors |
|---|---|
Use Scenario: Battery-powered ECG patch continuously monitors heart rhythm and transmits data via BLE during multi-week deployments. IC Role / Device Role / Timing Role: MAX6838XSD3-T supervises 1.2V LDO output powering the MCU and analog front-end, asserting reset if core voltage sags below safe operating level during cold-start or battery depletion. Use Value: 7.5µA quiescent current extends usable battery life beyond 12 months; 210ms timeout ensures full ADC calibration completes before firmware execution begins. |
Use Scenario: Smart wristband with optical PPG sensor and motion tracking runs on rechargeable Li-ion with dynamic voltage scaling. IC Role / Device Role / Timing Role: MAX6838XSD3-T monitors scaled-down 1.35V rail feeding the sensor hub, using RESET-IN to detect undervoltage before system lockup occurs. Use Value: Adjustable threshold via external divider enables precise trip point at 1.25V - avoiding false resets during transient load spikes while catching genuine brownouts. |
| Industrial IoT Edge Nodes | Low-Power Microcontroller Modules |
Use Scenario: Wireless temperature node deployed in remote locations uses energy harvesting and supercapacitor storage. IC Role / Device Role / Timing Role: MAX6838XSD3-T supervises 1.5V regulated output from buck converter, asserting reset until harvested energy stabilizes above operational threshold. Use Value: RESET-IN input accepts high-impedance divider (R1=1.2MΩ, R2=470kΩ), drawing only 260nA - preserving stored energy during startup. |
Use Scenario: Sub-GHz RF module with ARM Cortex-M0+ MCU requires deterministic reset behavior across 1.2V–1.8V supply range. IC Role / Device Role / Timing Role: MAX6838XSD3-T provides active-high RESET signal synchronized to 210ms timeout, compatible with bidirectional reset pins on target MCU. Use Value: Push-pull output eliminates need for external pullup resistor - reducing BOM count and PCB area in compact 2-layer modules. |
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 RESET, but monitors VCC directly (not RESET-IN); fixed 1.575V threshold (V suffix) | Requires VCC ≥0.75V for reset validity; cannot monitor supplies <1.2V without external scaling | Select when VCC itself is the monitored rail and fixed threshold suffices |
| MAX6381XR29-T | Open-drain active-low RESET, 2.93V fixed threshold, 200ms timeout; higher 12µA ICC | Designed for 3.3V systems; lacks RESET-IN adjustability and low-voltage operation | Select for legacy 3.3V designs where open-drain compatibility with existing µP reset pins is required |
Compared with MAX6838XSD3-T, MAX6836XSD3-T offers simpler VCC monitoring but no external threshold adjustment, while MAX6381XR29-T targets higher-voltage systems with different output polarity and less precision at sub-1.2V levels - making MAX6838XSD3-T uniquely suited for ultra-low-voltage, externally scalable supervision.
Availability
MAX6838XSD3-T is available at Aetrix Electronics and suitable for portable medical sensors, wearable health monitors, industrial IoT edge nodes, low-power microcontroller modules, and battery-backed memory backup systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6838XSD3-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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and communication applications.
The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor reset supervision in space- and power-constrained systems operating from 1.2V to 1.8V rails.
FAQ
What is the exact reset timeout period for MAX6838XSD3-T?
The MAX6838XSD3-T has a fixed reset active timeout period of 210ms, as indicated by the "D3" suffix in its part number. This delay begins when the RESET-IN voltage rises above the 444mV threshold and ensures the microprocessor has sufficient time to complete power-up initialization before releasing reset. The timing is guaranteed over temperature and supply voltage variations per the datasheet's Electrical Characteristics table.
Does MAX6838XSD3-T monitor VCC or an external voltage?
MAX6838XSD3-T does not monitor VCC directly. Instead, it uses the RESET-IN pin to monitor an externally derived voltage - typically generated by a resistive divider from the supply being supervised. Its internal comparator references a stable 444mV threshold, allowing precise trip-point setting for supplies as low as ~0.44V. VCC (1.1V–3.3V) only powers the IC and enables timing/accuracy guarantees.
What is the function of the RESET pin on MAX6838XSD3-T?
The RESET pin on MAX6838XSD3-T is a push-pull active-high output. It drives logic HIGH when reset is asserted (i.e., when RESET-IN falls below 444mV) and remains HIGH for the full 210ms timeout after RESET-IN rises above threshold. When inactive, it presents a high-impedance state - no external pullup is needed, simplifying interface with µPs having dedicated reset inputs.
Can MAX6838XSD3-T operate with VCC below 1.2V?
Yes - MAX6838XSD3-T operates with VCC as low as 1.1V, and its RESET-IN threshold accuracy (±3.0%) and 210ms timeout are guaranteed across this range. However, the monitored supply (via RESET-IN) can be as low as ~0.44V due to the internal 444mV reference and external resistor divider. This makes MAX6838XSD3-T suitable for next-generation sub-1.2V logic domains.
How do I calculate the resistor values for the RESET-IN divider on MAX6838XSD3-T?
Use the formula R1 = R2 × [(VMONITORED / 0.444V) − 1], where VMONITORED is your desired trip voltage and R2 is selected for low leakage (e.g., 200kΩ). For example, to trip at 1.35V: R1 = 200kΩ × [(1.35 / 0.444) − 1] ≈ 408kΩ. Ensure total divider current stays below 100nA to avoid threshold error - MAX6838XSD3-T's RESET-IN leakage is ±25nA.
MAX6838XSD3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- 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 Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6838XSD3-T FAQ
1.How can I place an order for MAX6838XSD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6838XSD3-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 MAX6838XSD3-T reliable?
The price and inventory of MAX6838XSD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6838XSD3-T is usually 5 days.
3.What payment methods are accepted for MAX6838XSD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6838XSD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6838XSD3-T?
MAX6838XSD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6838XSD3-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 MAX6838XSD3-T?
For technical support, including MAX6838XSD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6838XSD3-T requirements.
6.How does Aetrix verify that MAX6838XSD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6838XSD3-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 MAX6838XSD3-T meets industry standards.
7.What is the process for return or replacement of MAX6838XSD3-T?
All MAX6838XSD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6838XSD3-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 MAX6838XSD3-T part is unused and in its original packaging.
Return procedure for MAX6838XSD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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