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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:2,500
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Product details
Overview
MAX6838XSD3+T from Maxim Integrated is an ultra-low-voltage, adjustable-threshold microprocessor reset circuit in a 4-pin SC70 package. It monitors external supply voltages via RESET-IN (typical threshold 444mV), provides push-pull active-high RESET output, and features a 210ms reset timeout period (D3 suffix). Designed for low-power portable systems requiring precise brownout detection below 1.1V.
For engineers reviewing the MAX6838XSD3+T datasheet, MAX6838XSD3+T pinout, MAX6838XSD3+T application, or MAX6838XSD3+T equivalent, key selection criteria include its adjustable 444mV reference input, guaranteed reset validity down to VCC = 1.1V, ±3.0% RESET-IN threshold accuracy over temperature, and compatibility with resistive-divider-based voltage monitoring for sub-1.2V supplies.
Technical Context
The MAX6838XSD3+T uses an internal 444mV precision bandgap reference to compare externally divided supply voltage at RESET-IN. Reset assertion occurs when RESET-IN falls below this threshold, independent of VCC monitoring-enabling reliable detection of voltages as low as 0.44V with appropriate resistor networks.
Its push-pull active-high RESET output drives high after the 210ms timeout following RESET-IN recovery, sinking no current during reset assertion and sourcing ≥50µA at 0.8×VCC when asserted. The device operates across VCC = 1.1V to 3.3V and draws only 7.5µA typical supply current at 1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 210ms - fixed delay ensures µP remains held in reset long enough for stable power recovery |
| RESET-IN Threshold | 444mV ±3.0% - enables accurate external voltage monitoring down to ~0.44V using resistor dividers |
| Supply Voltage Range | 1.1V to 3.3V - supports operation with modern low-voltage logic and core supplies |
| Supply Current | 7.5µA (typ) at 1.8V - minimizes battery drain in portable and energy-sensitive applications |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup and ensures defined logic level during reset |
| Operating Temperature | -40°C to +85°C - qualified for industrial and extended-temperature embedded environments |
| VCC Minimum for Accuracy | 1.1V - required to guarantee RESET-IN threshold specification; below this, accuracy not assured |
Pinout & Package
MAX6838XSD3+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 voltage divider; reset asserts when voltage drops below 444mV |
| 2 | VCC | Supply input (1.1V–3.3V); powers internal circuitry and sets operating range for RESET-IN accuracy |
| 3 | GND | Ground reference for all internal comparators and output stage |
| 4 | RESET | Push-pull active-high output; drives high after 210ms timeout upon RESET-IN recovery |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enabled via RESET-IN pin with 444mV internal reference-supports custom trip points from 0.44V upward using external resistors |
| Low-Power Supervision | 7.5µA typical ICC allows continuous monitoring in battery-powered devices without significant runtime impact |
| Guaranteed Reset Validity | RESET output remains valid down to VCC = 1.1V-ensures deterministic behavior during deep brownout conditions |
| Immunity to VCC Transients | Rejects short negative-going VCC glitches up to 100µs (at 100mV overdrive), reducing false resets in noisy environments |
| SC70-4 Footprint | Compact 2.0mm × 2.1mm outline enables high-density placement on small-form-factor PCBs |
Applications
| Battery-Powered IoT Sensor Node | Low-Voltage FPGA Configuration Monitor |
|---|---|
Use Scenario: A coin-cell-powered environmental sensor node uses a 1.2V LDO to power an ultra-low-power MCU and RF transceiver. IC Role / Device Role / Timing Role: MAX6838XSD3+T monitors the 1.2V rail via external resistor divider on RESET-IN to detect brownout before MCU state corruption. Use Value: Its 444mV reference and 210ms timeout ensure the MCU resets cleanly before voltage collapses below functional minimum, preventing data loss or radio lockup. |
Use Scenario: An FPGA-based edge AI accelerator uses a 0.85V core supply and requires reliable configuration hold until power stabilizes. IC Role / Device Role / Timing Role: MAX6838XSD3+T monitors the 0.85V rail through a precision divider on RESET-IN, asserting active-high RESET to FPGA's CONFIG_DONE pin. Use Value: Push-pull output eliminates external pullup, and guaranteed operation down to VCC = 1.1V ensures supervision remains active even if auxiliary bias rails dip. |
| Wearable Health Monitor | Industrial Low-Power Microcontroller System |
Use Scenario: A wrist-worn ECG monitor runs from a single 1.5V alkaline cell, with supply voltage decaying from 1.5V to 0.9V over battery life. IC Role / Device Role / Timing Role: MAX6838XSD3+T tracks the decaying supply via RESET-IN, triggering reset when voltage crosses 1.0V threshold (set by R1/R2). Use Value: Adjustable threshold avoids premature reset during normal discharge slope while catching true brownout-extending usable battery life. |
Use Scenario: A programmable logic controller (PLC) I/O module uses a 1.1V digital core supply derived from a DC/DC converter with slow startup. IC Role / Device Role / Timing Role: MAX6838XSD3+T supervises the 1.1V rail using RESET-IN, holding µC in reset until stable, with 210ms timeout accommodating converter soft-start. Use Value: 210ms timeout exceeds typical DC/DC startup delays, and ±3.0% threshold accuracy ensures consistent reset point across temperature and unit variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6838XSD1+T | Same package and RESET-IN architecture, but 1.5ms reset timeout (D1 suffix) instead of 210ms | Suitable for faster-recovery systems where shorter reset hold time is acceptable | Select when system power stabilization occurs in <5ms and longer timeouts risk unnecessary processor downtime |
| MAX6381XR29+T | Fixed 2.93V reset threshold, SC70-3, 200ms timeout, no RESET-IN pin-monitors VCC directly | Limited to higher-voltage applications; lacks adjustable threshold capability | Choose only for simple VCC >2.5V monitoring where external divider flexibility is unnecessary |
Compared with MAX6838XSD3+T, the MAX6838XSD1+T offers identical adjustability and low-voltage operation but with reduced reset duration, while the MAX6381XR29+T sacrifices threshold flexibility for fixed-voltage simplicity and higher supply compatibility-neither is pin-compatible, and both require layout changes.
Availability
MAX6838XSD3+T is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, wearable health monitors, low-voltage FPGA configuration monitors, and industrial microcontroller systems requiring stable component supply across production lifecycles.
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, now part of Analog Devices, designs precision analog and mixed-signal ICs for power management, sensing, and interface applications.
The MAX6832–MAX6840 family delivers ultra-low-voltage reset supervision for portable and energy-critical systems, emphasizing sub-1.2V monitoring, minimal quiescent current, and SC70 footprint efficiency.
FAQ
What is the exact reset timeout period of the 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 after RESET-IN rises above the 444mV threshold and ensures the microprocessor remains held in reset long enough for power to stabilize. The value is production-tested and guaranteed across -40°C to +85°C.
Does the MAX6838XSD3+T monitor VCC or an external voltage?
The MAX6838XSD3+T does not monitor VCC directly. Instead, it uses the RESET-IN pin to compare an externally divided voltage against its internal 444mV reference. VCC (1.1V–3.3V) powers the device and enables RESET-IN accuracy-but the monitored supply can be independent and as low as ~0.44V with proper resistor selection.
What is the function of the RESET output on the MAX6838XSD3+T?
The MAX6838XSD3+T features a push-pull active-high RESET output. When RESET-IN falls below 444mV, RESET goes low; after RESET-IN recovers and the 210ms timeout expires, RESET drives high actively-requiring no external pullup resistor. This simplifies interfacing with µP reset inputs expecting active-high assertion.
Can the MAX6838XSD3+T operate reliably below 1.1V VCC?
No-the MAX6838XSD3+T requires VCC ≥1.1V to guarantee RESET-IN threshold accuracy per the datasheet. While the device may power on at lower VCC, the ±3.0% tolerance on the 444mV reference is only specified within 1.1V–3.3V. Below 1.1V, reset behavior becomes uncharacterized and should not be relied upon in production designs.
How do I calculate resistor values for the RESET-IN divider on the MAX6838XSD3+T?
Use R1 = R2 × ((VMON/0.444V) − 1), where VMON is the desired trip voltage and R2 connects RESET-IN to GND. For example, to detect 1.0V, set R2 = 200kΩ → R1 ≈ 252kΩ. Keep total divider current <100nA to avoid loading; R2 ≥100kΩ is recommended. The MAX6838XSD3+T's RESET-IN leakage is ±25nA, minimizing error.
MAX6838XSD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- 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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