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Analog Devices Inc./Maxim Integrated MAX6838XSD0+
- Part No.:
- MAX6838XSD0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6838XSD0+.pdf
- Description:
- MAX6838 ULTRA-LOW-VOLTAGE VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:11,843
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Product details
Overview
MAX6838XSD0+ from Maxim Integrated is a precision ultra-low-voltage microprocessor supervisory circuit with adjustable reset threshold, push-pull active-high RESET output, and 1.5ms fixed timeout period. It monitors external supply voltages via the RESET-IN pin (typical threshold 444mV), operates from VCC = 1.1V to 3.3V, draws only 7.5µA typical supply current, and guarantees valid reset assertion down to VCC = 0.75V - ideal for battery-powered embedded controllers requiring reliable brownout protection.
For engineers reviewing the MAX6838XSD0+ datasheet, MAX6838XSD0+ pinout, MAX6838XSD0+ application, or MAX6838XSD0+ equivalent, this device serves as a low-power, externally adjustable voltage monitor for systems where supply rails fall below 1.2V or require custom trip points not covered by factory-set thresholds.
Technical Context
The MAX6838XSD0+ uses an internal 444mV reference comparator to monitor voltage at the RESET-IN pin, enabling precise external threshold setting via resistive divider. Its push-pull active-high RESET output drives high after timeout when RESET-IN rises above threshold, eliminating need for external pullup.
It features ±3.0% RESET-IN threshold accuracy over –40°C to +85°C, 100ns MR glitch rejection (though MR is not present on MAX6838), and immunity to short negative VCC transients - ensuring robust operation in noisy portable environments without false resets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 1.5ms - ensures µP remains held in reset long enough for stable power-up of core logic after monitored supply recovery |
| RESET-IN Threshold | 444mV ±3.0% - enables accurate external trip point setting for supplies as low as 0.44V using high-impedance divider |
| Supply Voltage Range (VCC) | 1.1V to 3.3V - supports modern low-voltage SoCs and PMICs while maintaining full functionality and accuracy |
| Supply Current | 7.5µA typical - minimizes quiescent drain in always-on battery backup or energy-harvesting applications |
| RESET Output Type | Push-pull active-high - provides rail-to-rail drive without external components; sinks 150µA or sources 10µA at VCC ≥ 0.85V |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin-temperature embedded control environments |
| Reset Validity Limit | VCC ≥ 0.75V - guarantees RESET remains asserted and valid during deep brownout, preventing premature release |
Pinout & Package
MAX6838XSD0+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable PCBs. Pin 1 is RESET-IN, Pin 2 is VCC, Pin 3 is GND, and Pin 4 is RESET (active-high push-pull).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET-IN | High-impedance input (±25nA leakage) for external voltage monitoring; sets reset trip point via resistive divider referenced to 444mV |
| 2 | VCC | Power supply input (1.1V–3.3V); powers internal circuitry and defines operating range for RESET output drive strength |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to minimize noise coupling into RESET-IN path |
| 4 | RESET | Push-pull active-high output; drives high after timeout when RESET-IN > 444mV; no external pullup required |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enables precise monitoring of sub-1.2V supplies (e.g., 0.6V core rails) using external resistor divider - avoids costly redesign for nonstandard voltages |
| 1.5ms Fixed Timeout | Guarantees sufficient hold time for slow-ramping power supplies or clock-stabilized µPs before release |
| Ultra-Low 7.5µA Supply Current | Extends battery life in always-on monitoring circuits; enables use in coin-cell–powered IoT sensors |
| ±3.0% RESET-IN Accuracy Over Temp | Ensures consistent trip point across industrial temperature range without calibration or trimming |
| Push-Pull Active-High RESET | Eliminates need for external pullup resistor and associated board area, BOM cost, and signal integrity risk |
Applications
| Battery-Powered Sensor Node | Low-Voltage Microcontroller System |
|---|---|
Use Scenario: A wireless environmental sensor powered by a single Li-SOCl₂ cell (nominal 3.6V, discharging to 2.0V) with a 1.1V MCU core and 1.8V I/O domain. IC Role / Device Role / Timing Role: MAX6838XSD0+ monitors the 1.1V core rail via RESET-IN to assert reset if voltage drops below 0.95V, holding MCU in reset until stable. Use Value: Prevents erratic firmware execution during battery depletion; 7.5µA quiescent current extends operational lifetime by >15% vs. higher-current supervisors. |
Use Scenario: An industrial PLC module using a 0.85V FPGA core supplied by a DC/DC converter with tight regulation tolerance. IC Role / Device Role / Timing Role: MAX6838XSD0+ interfaces to the converter's feedback node to detect undervoltage before regulator dropout, triggering 1.5ms reset pulse. Use Value: Enables early brownout detection independent of VCC rail - critical when core supply is derived from a separate switching stage. |
| Portable Medical Diagnostic Device | Energy-Harvesting Edge Controller |
Use Scenario: A handheld glucose meter with dual-supply architecture: 1.2V analog front-end and 1.5V digital processor, both powered from a rechargeable Li-ion cell. IC Role / Device Role / Timing Role: MAX6838XSD0+ monitors the 1.2V analog rail using a precision divider to ensure ADC stability before system boot. Use Value: ±3.0% threshold accuracy prevents false resets during transient load steps, improving clinical measurement reliability. |
Use Scenario: A solar-powered smart irrigation controller with supercapacitor storage and a 1.0V ultra-low-power MCU. IC Role / Device Role / Timing Role: MAX6838XSD0+ tracks supercapacitor voltage via RESET-IN to initiate graceful shutdown when stored energy falls below 0.8V. Use Value: Adjustable threshold allows exact match to capacitor discharge curve, maximizing usable energy without risking MCU crash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6836XSD0+ | Same SC70-4 package and 1.5ms timeout, but uses VCC monitoring (not RESET-IN) with factory-set 1.575V threshold | Suitable only for fixed 1.5V–1.8V supplies; cannot monitor sub-1.2V rails | Select MAX6836XSD0+ only if VCC itself is the monitored rail and threshold is known and stable |
| TLV809KDBZR | Fixed 3.08V reset threshold, SOT-23-3, 1.5ms timeout, 1.2µA supply current, open-drain active-low output | Lacks adjustable threshold and push-pull drive; requires external pullup and is incompatible with <1.2V monitoring | Choose TLV809KDBZR for cost-sensitive 3.3V systems where minimal current draw outweighs flexibility needs |
Compared with MAX6836XSD0+, MAX6838XSD0+ trades fixed VCC monitoring for external adjustability - essential for sub-1.2V rails - while retaining identical timing and package. Versus TLV809KDBZR, it offers higher drive strength, wider VCC range, and true low-voltage adaptability at modest current penalty.
Availability
MAX6838XSD0+ is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT nodes, low-voltage microcontroller systems, and energy-harvesting edge controllers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6838XSD0+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6832–MAX6840 family delivers ultra-low-voltage supervision for next-generation portable and embedded systems where traditional 3.3V/5V supervisors fail - targeting sub-1.2V core supplies and battery-constrained environments.
FAQ
What is the exact reset timeout period for MAX6838XSD0+?
The MAX6838XSD0+ has a fixed reset active timeout period of 1.5ms, corresponding to the "D1" suffix in the ordering guide. This delay begins after RESET-IN rises above the 444mV threshold and ensures the microprocessor remains held in reset long enough for stable power-up sequencing before release. The value is guaranteed over –40°C to +85°C and does not vary with VCC or load.
Does MAX6838XSD0+ monitor VCC or an external voltage?
MAX6838XSD0+ monitors only the voltage applied to its RESET-IN pin - not VCC. VCC (1.1V to 3.3V) powers the IC but is not sensed; instead, an external resistive divider connects the supply to be monitored (e.g., a 0.9V core rail) to RESET-IN, with the trip point set relative to the internal 444mV reference. This decouples supervision from the IC's own supply rail.
What is the function of the RESET pin on MAX6838XSD0+?
The RESET pin on MAX6838XSD0+ is a push-pull active-high output. It drives high (to VCC level) after the 1.5ms timeout when RESET-IN exceeds 444mV, and drives low when RESET-IN falls below threshold. No external pullup is needed, and it can directly interface with µP reset inputs requiring active-high assertion - simplifying layout and reducing component count.
Can MAX6838XSD0+ operate with VCC below 1.2V?
Yes - MAX6838XSD0+ is fully specified to operate with VCC as low as 1.1V. At this voltage, it maintains ±3.0% RESET-IN threshold accuracy and guarantees valid RESET output behavior (VOH ≥ 0.8×VCC, VOL ≤ 0.2×VCC). Below 1.1V, functionality is not assured per datasheet specifications.
Is there a manual reset (MR) input on MAX6838XSD0+?
No - MAX6838XSD0+ does not include a manual reset (MR) input. Unlike MAX6835/MAX6836/MAX6837 variants, the MAX6838/MAX6839/MAX6840 series replace MR with RESET-IN for external threshold adjustment. If manual reset capability is required, a discrete switch or logic signal must be injected upstream of the RESET-IN divider or a different variant (e.g., MAX6836XSD0+) should be selected.
MAX6838XSD0+ 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 Low
- Reset Timeout:
- 70µs Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6838XSD0+ FAQ
1.How can I place an order for MAX6838XSD0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6838XSD0+ 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 MAX6838XSD0+ reliable?
The price and inventory of MAX6838XSD0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6838XSD0+ is usually 5 days.
3.What payment methods are accepted for MAX6838XSD0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6838XSD0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6838XSD0+?
MAX6838XSD0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6838XSD0+ 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 MAX6838XSD0+?
For technical support, including MAX6838XSD0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6838XSD0+ requirements.
6.How does Aetrix verify that MAX6838XSD0+ is sourced from the original manufacturer or authorized distributors?
All MAX6838XSD0+ 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 MAX6838XSD0+ meets industry standards.
7.What is the process for return or replacement of MAX6838XSD0+?
All MAX6838XSD0+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6838XSD0+, 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 MAX6838XSD0+ part is unused and in its original packaging.
Return procedure for MAX6838XSD0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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