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Analog Devices Inc./Maxim Integrated MAX6838XSD2+T
- Part No.:
- MAX6838XSD2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6838XSD2+T.pdf
- Description:
- IC MPU SUPERVISOR SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,237
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Product details
Overview
MAX6838XSD2+T from Maxim Integrated is an ultra-low-voltage, adjustable-threshold microprocessor reset circuit in SC70-4 package. It monitors external supply voltages via RESET-IN pin (typical threshold 444mV), provides push-pull active-high RESET output, and features 30ms fixed timeout period (D2 suffix). Designed for reliable power-on reset in sub-1.2V core supplies, it supports portable/battery-powered systems requiring stable low-power supervision.
For engineers reviewing the MAX6838XSD2+T datasheet, MAX6838XSD2+T pinout, MAX6838XSD2+T application, or MAX6838XSD2+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 immunity to short negative VCC transients.
Technical Context
The MAX6838XSD2+T uses an internal 444mV precision 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 supervision of supplies as low as 0.44V with appropriate resistor divider.
Its push-pull active-high RESET output drives high after timeout (30ms) following RESET-IN recovery, with VOH ≥ 0.8×VCC across 1.1V–3.3V VCC range and VOL ≤ 0.2×VCC at ISINK = 200µA. The device operates with 7.5µA typical supply current and guarantees functional reset down to VCC = 1.1V for RESET-IN accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 30ms - Fixed delay ensures µP remains held in reset long enough for stable power rail recovery before release. |
| RESET-IN Threshold | 444mV (±3.0% over -40°C to +85°C) - Enables precise external voltage monitoring using high-value resistive dividers for ultra-low quiescent current. |
| Supply Current | 7.5µA (typ at VCC = 1.2V) - Minimizes battery drain in always-on supervision circuits for portable equipment. |
| VCC Operating Range | 1.1V to 3.3V - Supports operation from low-voltage logic rails while maintaining RESET-IN accuracy and output drive capability. |
| RESET Output Type | Push-pull active-high - Eliminates need for external pullup resistor; directly interfaces with µP reset inputs requiring active-high assertion. |
| Reset Validity Limit | VCC ≥ 1.1V - Ensures RESET-IN comparator and output stage function correctly only within specified accuracy band. |
| RESET-IN Leakage | ±25nA - Allows use of >1MΩ divider resistors without significant threshold error or power penalty. |
Pinout & Package
MAX6838XSD2+T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), RoHS-compliant with lead-free termination (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET-IN | High-impedance input for external voltage divider; reset asserts when voltage falls below 444mV reference. |
| 2 | VCC | Supply and bias rail (1.1V–3.3V); powers internal circuitry and defines RESET output voltage levels. |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection for accurate threshold comparison. |
| 4 | RESET | Push-pull active-high output; drives high after 30ms timeout when RESET-IN recovers above threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Set via external resistor divider on RESET-IN; supports monitoring of supplies from 0.44V to 3.3V with minimal added components. |
| Guaranteed reset validity | RESET output meets VOH/VOL specs down to VCC = 1.1V-ensures interoperability with low-voltage µPs during brownout conditions. |
| Low-supply-current supervision | 7.5µA typical ICC enables multi-year battery life in always-on IoT sensors and wearables requiring continuous voltage monitoring. |
| Immunity to fast transients | Rejects VCC glitches <100ns duration-prevents spurious resets in electrically noisy environments without external filtering. |
| SC70-4 footprint | 2.0mm × 2.1mm package saves board space in compact portable designs where PCB real estate is constrained. |
Applications
| Battery-Powered Wearables | Ultra-Low-Voltage Microcontroller Systems |
|---|---|
|
Use Scenario: Supervising 0.8V–1.0V core supply of ARM Cortex-M0+ MCU in fitness tracker with coin-cell battery. IC Role / Device Role / Timing Role: Adjustable-threshold reset supervisor asserting active-high signal to MCU's reset pin during brownout. Use Value: 444mV RESET-IN reference enables accurate trip point setting for sub-1V rails; 30ms timeout prevents premature release before LDO stabilization. |
Use Scenario: Power-on reset for RISC-V SoC with dual-rail supply (0.9V core, 1.8V I/O), where core rail powers reset circuit. IC Role / Device Role / Timing Role: Voltage detector monitoring core rail via RESET-IN; generates clean reset pulse synchronized to core rail stability. Use Value: Push-pull active-high output eliminates pullup resistor, reducing BOM count and leakage path; ±3.0% threshold accuracy ensures deterministic reset timing across temperature. |
| Industrial Sensor Nodes | Medical Implantable Devices |
|
Use Scenario: Continuous voltage supervision of 1.2V analog front-end in wireless temperature sensor node operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Low-power reset supervisor ensuring µC remains held until analog supply settles post-power-up. Use Value: 7.5µA supply current extends battery life; SC70-4 package fits tight form factor; RESET-IN leakage ≤25nA preserves divider accuracy over lifetime. |
Use Scenario: Critical power monitoring for implantable neurostimulator ASIC powered from regulated 1.1V supply. IC Role / Device Role / Timing Role: Fail-safe reset generator guaranteeing ASIC initialization only after stable core voltage is confirmed. Use Value: Guaranteed reset validity at VCC = 1.1V ensures functional reliability at minimum operating voltage; ±3.0% threshold tolerance meets medical-grade accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6839XSD2+T | Push-pull active-low RESET output; identical RESET-IN threshold, timeout, and package. | Requires µP with active-low reset input; incompatible with active-high-only reset pins without level-shifting. | Select when interfacing with legacy µPs expecting active-low reset assertion and no external inversion is desired. |
| TLV803EB26DBVR | Fixed 2.63V reset threshold; no RESET-IN adjustability; SOT-23-3 package; 1.5ms timeout (not 30ms). | Limited to higher-voltage systems; lacks external threshold flexibility and longer timeout needed for slow-ramping supplies. | Choose only for cost-sensitive, non-adjustable 2.63V supervision where 30ms timeout is not required. |
Compared with MAX6839XSD2+T, MAX6838XSD2+T provides direct compatibility with active-high reset architectures, eliminating need for inverters or pullups. Against TLV803EB26DBVR, MAX6838XSD2+T enables precise low-voltage monitoring and offers field-configurable timeout-critical for modern sub-1.2V SoCs.
Availability
MAX6838XSD2+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, ultra-low-voltage microcontroller systems, and industrial sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for MAX6838XSD2+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6832–MAX6840 family delivers ultra-low-voltage, low-quiescent-current reset supervision for next-generation portable and battery-constrained systems-prioritizing accuracy, small size, and robust transient immunity.
FAQ
What is the exact reset timeout period for MAX6838XSD2+T?
The MAX6838XSD2+T has a fixed 30ms reset active timeout period (D2 suffix). This means that after RESET-IN rises above the 444mV threshold-or after manual intervention-the RESET output remains asserted (high) for exactly 30ms before releasing. This value is production-tested and guaranteed across -40°C to +85°C, ensuring consistent µP initialization timing in all operating conditions. The 30ms delay accommodates slow-ramping power supplies common in low-power SoCs.
Can MAX6838XSD2+T monitor a 0.6V supply rail?
Yes, MAX6838XSD2+T can monitor a 0.6V supply using an external resistor divider on the RESET-IN pin. With a typical internal reference of 444mV, a divider ratio of R1/R2 = (0.6V / 0.444V) − 1 ≈ 0.351 sets the trip point precisely at 0.6V. The device's ±25nA RESET-IN leakage allows use of high-value resistors (e.g., R2 = 200kΩ, R1 = 70.3kΩ), minimizing current draw. Note that VCC must be ≥1.1V to guarantee RESET-IN threshold accuracy per datasheet specifications.
Does MAX6838XSD2+T require an external pullup resistor on the RESET pin?
No, MAX6838XSD2+T does not require an external pullup resistor because it features a push-pull active-high RESET output. The internal driver actively pulls RESET high when asserted and low when released-unlike open-drain variants (e.g., MAX6840). This simplifies design, reduces component count, and avoids potential floating states or weak pullup conflicts. The output meets VOH ≥ 0.8×VCC and VOL ≤ 0.2×VCC specifications across its full 1.1V–3.3V VCC range.
What is the minimum VCC required for MAX6838XSD2+T to guarantee RESET-IN accuracy?
The minimum VCC required for MAX6838XSD2+T to guarantee RESET-IN threshold accuracy is 1.1V, as specified in the Electrical Characteristics table. Below 1.1V, the internal reference and comparator may deviate beyond the ±3.0% tolerance band. While the device may still operate down to VCC = 0.55V for basic functionality, only at VCC ≥ 1.1V is the 444mV RESET-IN threshold accuracy fully assured across temperature (-40°C to +85°C). This ensures reliable trip-point setting in production-critical applications.
How does MAX6838XSD2+T handle fast voltage transients on VCC?
MAX6838XSD2+T is designed to ignore fast negative-going VCC transients up to 100ns in duration, as confirmed by the "MR Glitch Rejection" specification and Figure 2 in the datasheet. Its reset comparator incorporates built-in hysteresis and filtering that rejects short-duration noise spikes-preventing false resets during switching regulator ripple or ESD events. For enhanced immunity, a 0.1µF ceramic capacitor placed close to the VCC pin further suppresses transients without affecting valid power-fail detection.
MAX6838XSD2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- 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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6838XSD2+T FAQ
1.How can I place an order for MAX6838XSD2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6838XSD2+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 MAX6838XSD2+T reliable?
The price and inventory of MAX6838XSD2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6838XSD2+T is usually 5 days.
3.What payment methods are accepted for MAX6838XSD2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6838XSD2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6838XSD2+T?
MAX6838XSD2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6838XSD2+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 MAX6838XSD2+T?
For technical support, including MAX6838XSD2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6838XSD2+T requirements.
6.How does Aetrix verify that MAX6838XSD2+T is sourced from the original manufacturer or authorized distributors?
All MAX6838XSD2+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 MAX6838XSD2+T meets industry standards.
7.What is the process for return or replacement of MAX6838XSD2+T?
All MAX6838XSD2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6838XSD2+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 MAX6838XSD2+T part is unused and in its original packaging.
Return procedure for MAX6838XSD2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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