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Analog Devices Inc./Maxim Integrated MAX6388XS18D3-T
- Part No.:
- MAX6388XS18D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS18D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,245
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Product details
Overview
MAX6388XS18D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.8V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It consumes only 3μA at 1.8V and guarantees valid reset state down to VCC = 1V, used in portable battery-powered equipment and dual-rail power systems.
For engineers reviewing the MAX6388XS18D3-T datasheet, MAX6388XS18D3-T pinout, MAX6388XS18D3-T application, or MAX6388XS18D3-T equivalent, key selection considerations include its 1.8V reset threshold accuracy, 140ms timeout timing, 4-pin SC70 package, dual-supply monitoring capability via RESET IN, and compatibility with systems requiring guaranteed reset assertion during brownout and power-down transitions.
Technical Context
The MAX6388XS18D3-T integrates a precision voltage comparator monitoring VCC against a fixed 1.8V threshold and a second high-impedance comparator monitoring external RESET IN against an internal 1.27V reference. Reset asserts when either input falls below its respective threshold, and remains asserted for 140ms after recovery.
Its active-high push-pull RESET output drives high during fault conditions and deasserts cleanly without external pullup; the RESET IN pin accepts resistor-divider networks to set user-defined secondary thresholds, enabling flexible dual-rail supervision in I/O/core voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges |
| VCC Reset Timeout | 140ms minimum - holds processor in reset long enough for stable power rail recovery before code execution resumes |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct connection to μP reset inputs |
| RESET IN Threshold | 1.27V internal reference - allows precise secondary voltage monitoring using external resistor divider (e.g., for 3.3V or 2.5V rails) |
| Operating Voltage Range | 1.0V to 5.5V - supports supervision of ultra-low-voltage logic rails and legacy 5V systems |
| Reset Assertion Validity | Down to VCC = 1V - guarantees correct reset logic level even during deep brownout, preventing premature release |
Pinout & Package
MAX6388XS18D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets reset threshold reference |
| 2 | RESET | Active-high push-pull output; drives high during reset condition and low otherwise; compatible with standard μP reset inputs |
| 3 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 4 | RESET IN | Auxiliary high-impedance input monitored against 1.27V internal reference; enables dual-supply supervision via external resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN enables robust power sequencing in core/I/O dual-rail systems |
| Factory-trimmed 1.8V threshold | Eliminates external resistor network and calibration effort while maintaining ±2.5% accuracy over full industrial temperature range |
| 140ms minimum reset timeout | Ensures sufficient hold time for slow-rising power supplies and prevents spurious resets during marginal startup conditions |
| Negative-going transient immunity | Withstands short-duration VCC glitches (e.g., <1µs at 100mV overdrive) without false triggering, improving system noise resilience |
| Ultra-low 3μA supply current | Reduces quiescent power in always-on subsystems, extending battery life in portable medical and sensor applications |
Applications
| Portable Medical Sensors | Dual-Rail Microcontroller Systems |
|---|---|
|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell with separate 1.8V core and 3.3V I/O rails. IC Role / Device Role / Timing Role: Supervises both rails: VCC monitors 1.8V core supply; RESET IN monitors 3.3V I/O via 2.5:1 resistor divider to detect 3.3V drop below 1.8V-equivalent threshold. Use Value: Prevents firmware crash during battery sag by asserting reset on either rail failure, with 140ms timeout ensuring stable recovery before boot. |
Use Scenario: Industrial PLC controller using ARM Cortex-M4 with independent 1.2V core and 3.3V peripheral supplies. IC Role / Device Role / Timing Role: MAX6388XS18D3-T's RESET IN pin configured to supervise 3.3V rail while VCC monitors 1.2V rail (using appropriate divider), triggering unified reset on either fault. Use Value: Guarantees synchronized reset across domains, eliminating metastability during asymmetric power-up sequences. |
| Battery-Powered IoT Edge Nodes | Automotive Body Control Modules |
|
Use Scenario: LoRaWAN sensor node with Li-SOCl₂ primary cell and buck-boost regulator generating 1.8V system rail. IC Role / Device Role / Timing Role: Monitors regulated 1.8V rail directly at VCC; RESET output connected to MCU reset pin; no MR or RESET IN used. Use Value: 3μA quiescent current extends 10-year battery life; 1.8V threshold matches rail exactly; 140ms timeout accommodates regulator soft-start delay. |
Use Scenario: 12V automotive body control module with local 1.8V LDO for CAN transceiver logic and 5V rail for microcontroller. IC Role / Device Role / Timing Role: Configured to monitor 1.8V LDO output (VCC) and 5V rail (via RESET IN + divider); operates across -40°C to +125°C ambient. Use Value: AEC-Q100 qualified variant available; ±2.5% threshold accuracy ensures reliable cold-crank brownout detection without false resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS18D3-T | Same 1.8V threshold, 140ms timeout, and 4-pin SC70 package, but includes manual reset (MR) input instead of RESET IN | Suitable where operator-initiated reset is required; not suitable for dual-supply monitoring | Select MAX6385XS18D3-T if manual reset functionality is needed and auxiliary voltage monitoring is unnecessary |
| TLV809K18DBZR | 1.8V reset threshold, 140ms timeout, SOT-23-3 package; lacks RESET IN and operates down to 0.9V VCC | Single-rail only; lower minimum VCC enables use with sub-1V logic; no dual-monitoring capability | Choose TLV809K18DBZR for cost-sensitive, single-rail applications where board space permits SOT-23-3 and RESET IN is unused |
Compared with MAX6385XS18D3-T, MAX6388XS18D3-T trades manual reset for dual-supply monitoring-critical for systems with independent core/I/O rails. Versus TLV809K18DBZR, it adds RESET IN functionality and maintains higher accuracy over temperature, at the cost of one additional pin and slightly higher price.
Availability
MAX6388XS18D3-T is available at Aetrix Electronics and suitable for portable medical sensors, dual-rail microcontroller systems, battery-powered IoT edge nodes, and automotive body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6388XS18D3-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 in industrial, automotive, and computing markets.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for battery-operated and thermally demanding systems, with variants optimized for single/dual-rail monitoring, manual reset, and automotive qualification.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6388XS18D3-T?
The MAX6388XS18D3-T has a factory-set nominal reset threshold of 1.8V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet and applies specifically to the XS18 suffix variant. The threshold is trimmed during production and does not require external calibration.
Does MAX6388XS18D3-T support monitoring of a second voltage rail?
Yes, MAX6388XS18D3-T supports dual-voltage supervision via its dedicated RESET IN pin, which compares an external voltage against an internal 1.27V reference. By connecting a resistor divider to RESET IN, users can configure supervision of a second rail (e.g., 3.3V or 2.5V) while VCC monitors the primary 1.8V supply. This functionality is explicitly documented in the Pin Description and Applications Information sections.
What is the function of the RESET output on MAX6388XS18D3-T?
The RESET output of MAX6388XS18D3-T is an active-high push-pull driver. It asserts high when VCC drops below 1.8V or when the voltage at RESET IN falls below its derived threshold, and remains high for a minimum of 140ms after both voltages recover. This eliminates the need for an external pullup resistor and ensures clean, fast transitions compatible with standard microprocessor reset inputs.
Can MAX6388XS18D3-T operate down to 1.0V supply voltage?
Yes, MAX6388XS18D3-T is fully specified to operate with VCC as low as 1.0V. Its reset output remains logically valid (correct high/low state) down to VCC = 1V, a critical feature for brownout detection in systems with weak or sagging supplies. This behavior is guaranteed per the Absolute Maximum Ratings and Electrical Characteristics tables in the datasheet.
What package type and dimensions does MAX6388XS18D3-T use?
MAX6388XS18D3-T uses a lead-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This compact footprint is ideal for space-constrained portable electronics and is verified in the Package Information section of the datasheet.
MAX6388XS18D3-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.8V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6388XS18D3-T FAQ
1.How can I place an order for MAX6388XS18D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS18D3-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 MAX6388XS18D3-T reliable?
The price and inventory of MAX6388XS18D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS18D3-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS18D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS18D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS18D3-T?
MAX6388XS18D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS18D3-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 MAX6388XS18D3-T?
For technical support, including MAX6388XS18D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS18D3-T requirements.
6.How does Aetrix verify that MAX6388XS18D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS18D3-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 MAX6388XS18D3-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS18D3-T?
All MAX6388XS18D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS18D3-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 MAX6388XS18D3-T part is unused and in its original packaging.
Return procedure for MAX6388XS18D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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