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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:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:460
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Product details
Overview
The 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 timeout period. It monitors supply voltages via external resistive divider at RESET-IN (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 µP systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6838XSD0 datasheet, MAX6838XSD0 pinout, MAX6838XSD0 application, or MAX6838XSD0 equivalent, this device serves as a low-power, adjustable-threshold reset supervisor for sub-1.2V core supplies, supporting precise voltage monitoring in portable instrumentation, embedded controllers, and low-voltage SoC power sequencing where factory-fixed thresholds are insufficient.
Technical Context
The MAX6838XSD0 implements a high-impedance comparator architecture that references an internal 444mV bandgap-derived threshold at the RESET-IN pin, enabling externally set trip points for monitored supplies as low as 0.44V. Its push-pull active-high RESET output drives directly into CMOS inputs without pullup, with VOH ≥ 0.8×VCC and VOL ≤ 0.2×VCC across full operating range.
It features fixed 1.5ms reset timeout (D1 suffix), ±3.0% RESET-IN threshold accuracy over –40°C to +85°C, immunity to VCC transients <100ns, and guaranteed operation down to VCC = 0.75V - ensuring deterministic reset behavior during slow power ramps and deep brownouts in modern low-voltage digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 1.5ms - ensures sufficient hold time for µP initialization after supply stabilization |
| RESET-IN Threshold | 444mV ±3.0% - stable reference enabling accurate external voltage monitoring down to 0.44V |
| Supply Voltage Range | 1.1V to 3.3V - supports I/O and core rails in modern low-power ASICs and µCs |
| Supply Current | 7.5µA (typ) - enables multi-year battery life in always-on portable monitoring devices |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup, reduces BOM count and board space |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
| VCC Minimum for Reset Validity | 0.75V - guarantees RESET remains asserted until supply recovers above functional logic threshold |
Pinout & Package
MAX6838XSD0 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm 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 | Supply rail (1.1V–3.3V); powers internal circuitry and sets output drive strength |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to system ground plane |
| 4 | RESET | Push-pull active-high output; drives µP reset pin directly without external components |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Set via external resistor divider on RESET-IN - enables precise trip point selection for any supply ≥0.44V |
| Low Quiescent Current | 7.5µA typical - minimizes battery drain in always-on supervisory applications |
| Guaranteed Reset Validity | Valid down to VCC = 0.75V - ensures µP remains held in reset until supply reaches functional logic level |
| Transient Immunity | Rejects VCC glitches <100ns - prevents spurious resets in noisy power environments |
| SC70-4 Footprint | 2.0mm × 2.1mm - saves >50% board area vs. SOT-23 while maintaining hand-solderability |
Applications
| Battery-Powered IoT Sensor Node | Low-Voltage FPGA Configuration Monitor |
|---|---|
|
Use Scenario: A coin-cell–powered environmental sensor node uses a 1.1V LDO to power its µC and RF transceiver, requiring reliable reset during cold-start and battery depletion. IC Role / Device Role / Timing Role: MAX6838XSD0 monitors the 1.1V rail via RESET-IN divider, asserting active-high RESET until voltage stabilizes above 1.12V and holds for 1.5ms. Use Value: Enables deterministic wake-up from deep sleep without external RC timing or voltage reference ICs, extending usable battery life by eliminating unnecessary reset retries. |
Use Scenario: An FPGA-based edge AI accelerator employs dual-rail power (1.0V core, 2.5V I/O); the core rail must be validated before configuration begins. IC Role / Device Role / Timing Role: MAX6838XSD0's RESET-IN pin monitors the 1.0V core supply; its 1.5ms timeout ensures FPGA configuration controller receives clean, glitch-free reset signal post-power-up. Use Value: Prevents partial bitstream loading and configuration lockup by guaranteeing core voltage stability before release of FPGA PROG_B line. |
| Portable Medical Diagnostic Handheld | Industrial PLC Submodule Power Sequencer |
|
Use Scenario: A handheld ECG analyzer uses a 1.2V analog front-end and 1.8V digital processor, both powered from a single Li-ion cell via buck-boost regulator. IC Role / Device Role / Timing Role: MAX6838XSD0 tracks the regulated 1.2V rail using a 100kΩ/39.2kΩ divider on RESET-IN, generating active-high reset with 1.5ms hold time. Use Value: Eliminates risk of analog front-end latch-up or digital corruption during battery voltage sag, meeting IEC 60601-1 reliability requirements for medical devices. |
Use Scenario: A modular PLC I/O base uses multiple isolated DC-DC converters; one module requires coordinated reset sequencing between 3.3V control logic and 24V field-side interface. IC Role / Device Role / Timing Role: MAX6838XSD0 monitors the 3.3V control rail and asserts RESET to the local µC only after 1.5ms stability, decoupling from field-side power ramp timing. Use Value: Ensures deterministic boot order without custom timing circuits, reducing design validation effort and field failure rate due to race conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6381XR24-T | Fixed 2.4V reset threshold, open-drain active-low output, 200ms timeout, SC70-3 package | Designed for higher-voltage I/O rails; lacks adjustable threshold and active-high output | Select when monitoring 2.4V+ supplies and interfacing with legacy µPs requiring open-drain reset |
| TPS3808G15DBVR | Fixed 1.5V threshold, push-pull active-low output, 200ms timeout, SOT-23-5 package | Higher minimum VCC (1.5V), no RESET-IN adjustability, larger footprint than SC70-4 | Choose for cost-sensitive industrial applications where 1.5V fixed threshold suffices and board space allows SOT-23 |
Compared with MAX6838XSD0, MAX6381XR24-T offers simpler integration for fixed 2.4V monitoring but cannot adapt to sub-1.2V rails or provide active-high drive; TPS3808G15DBVR delivers lower cost and TI ecosystem support but sacrifices adjustability, ultra-low current, and SC70-4 miniaturization critical for portable designs.
Availability
MAX6838XSD0 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, portable medical diagnostics, low-voltage FPGA configuration, industrial PLC modules, and embedded controller power monitoring requiring stable component supply and long-term lifecycle assurance.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6832–MAX6840 family was designed specifically to address ultra-low-voltage power supervision needs in portable and battery-operated systems, delivering precision reset functionality in minimal SC70 footprints with industry-leading quiescent current.
FAQ
What is the exact reset timeout period for MAX6838XSD0?
The MAX6838XSD0 has a fixed reset active timeout period of 1.5ms (D1 suffix), measured from the moment VCC or RESET-IN rises above the threshold until RESET deasserts. This value is guaranteed over temperature and process variation, ensuring consistent µP initialization timing across all operating conditions for the MAX6838XSD0.
How do I calculate the external resistor values for the RESET-IN divider on MAX6838XSD0?
Use R1 = R2 × [(VMONITORED / 0.444V) − 1], where VMONITORED is the desired trip voltage and R2 is selected for low leakage (e.g., 200kΩ). For a 1.2V supply, R1 ≈ 340kΩ. The MAX6838XSD0's RESET-IN input draws only ±25nA, enabling high-value resistors that minimize power loss while maintaining accuracy for the MAX6838XSD0.
Does MAX6838XSD0 require an external pullup resistor on its RESET pin?
No. The MAX6838XSD0 features a push-pull active-high RESET output, which actively drives HIGH and LOW without external components. Unlike open-drain supervisors, it eliminates the need for a pullup resistor - simplifying layout, reducing BOM count, and improving noise immunity for the MAX6838XSD0 in compact PCB designs.
What is the minimum VCC required for MAX6838XSD0 to guarantee RESET validity?
The MAX6838XSD0 guarantees valid active-high RESET output down to VCC = 0.75V, meaning RESET remains asserted until the supply recovers above this level. Below 0.75V, output behavior is not specified - this specification ensures robust brownout protection for µPs with 0.8V logic thresholds, a key reliability feature of the MAX6838XSD0.
Is MAX6838XSD0 pin-compatible with other devices in the MAX6832–MAX6840 family?
Yes - MAX6838XSD0 shares the same 4-pin SC70-4 pinout (RESET-IN, VCC, GND, RESET) with MAX6839XSD0 and MAX6840XSD0. However, it is not pin-compatible with 3-pin variants (MAX6832–MAX6834) or with MR-equipped 4-pin versions (MAX6835–MAX6837), as pin 1 function differs. Always verify pin mapping per datasheet for the MAX6838XSD0.
MAX6838XSD0 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 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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