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Analog Devices Inc./Maxim Integrated MAX6387XS26D3-T
- Part No.:
- MAX6387XS26D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS26D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,305
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Product details
Overview
MAX6387XS26D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with dual-voltage monitoring capability, factory-set 2.63V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and auxiliary RESET IN input for secondary voltage supervision. It features active-low push-pull RESET output and operates down to VCC = 1.0V - used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6387XS26D3-T datasheet, MAX6387XS26D3-T pinout, MAX6387XS26D3-T application, or MAX6387XS26D3-T equivalent, key selection criteria include its dual-monitoring architecture, guaranteed reset validity at low VCC, ±2.5% threshold accuracy across automotive temperature range, SC70-4 package footprint, and compatibility with 1.8V–5.0V supply rails.
Technical Context
The MAX6387XS26D3-T integrates two independent reset comparators: one monitors VCC against a precision 2.63V threshold, while the second compares an external voltage applied to RESET IN against a stable 1.27V internal reference. Reset assertion occurs if either monitored voltage falls below its respective threshold, and the active-low push-pull output remains asserted for ≥140ms after recovery.
Its design supports system-level reliability in dual-rail environments - such as I/O/core voltage pairs - where independent monitoring of both supplies is required before releasing the processor from reset. The device guarantees correct RESET logic state down to VCC = 1.0V and exhibits immunity to negative-going VCC transients up to 100mV overdrive for durations under ~10µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (nominal), ±2.5% tolerance over -40°C to +125°C - ensures consistent reset activation across automotive temperature range |
| RESET Timeout Period | 140ms (minimum) - provides sufficient hold time for microprocessor initialization after power stabilization |
| Supply Current | 3μA at +1.8V, 6μA at +3.6V - enables ultra-low-power operation in battery-critical applications |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor and drives standard CMOS/TTL inputs directly |
| Auxiliary Input | RESET IN comparator referenced to 1.27V - allows user-defined secondary reset threshold via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset behavior even during deep brownout conditions |
| Reset Assertion Delay | 35μs (VCC falling at 10mV/μs) - fast response to supply collapse without false triggering on noise |
Pinout & Package
MAX6387XS26D3-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 and automotive PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail - powers internal circuitry and triggers reset when <2.63V |
| 2 | RESET | Active-low push-pull output - drives low during reset; high-impedance release ensures clean deassertion without bus contention |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | High-impedance auxiliary input - accepts divided-down voltage for secondary reset detection; bias current <50nA minimizes divider error |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset comparators | Simultaneous monitoring of VCC and external RESET IN voltage - enables coordinated reset release in multi-rail SoC systems |
| Factory-trimmed 2.63V threshold | ±2.5% accuracy over full -40°C to +125°C range - eliminates need for external calibration in automotive-grade designs |
| 140ms minimum reset timeout | Guaranteed hold time ensures μP completes internal boot sequence before release - prevents premature code execution |
| Valid RESET output down to VCC = 1.0V | Ensures deterministic reset state during deep brownout - critical for fail-safe shutdown in safety-critical applications |
| Negative-going transient immunity | Rejects VCC glitches <100mV amplitude and <10µs duration - improves robustness in electrically noisy environments |
Applications
| Automotive Body Control Module | Industrial PLC I/O Card |
|---|---|
Use Scenario: Monitors both 5V system rail and 3.3V microcontroller core supply in a vehicle door module. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting reset until both rails stabilize above thresholds. Use Value: Prevents MCU lockup during ignition transients by enforcing synchronized release only after both supplies meet timing and voltage criteria. |
Use Scenario: Ensures safe startup of programmable logic controller I/O expansion card powered by isolated 24V-to-5V and 24V-to-3.3V converters. IC Role / Device Role / Timing Role: Supervises primary 5V rail and secondary 3.3V rail via RESET IN divider; asserts reset if either drops below threshold. Use Value: Eliminates risk of I/O misconfiguration during partial power-up by holding FPGA and interface ICs in reset until both domains are fully operational. |
| Medical Portable Infusion Pump | Battery-Powered IoT Sensor Node |
Use Scenario: Provides fail-safe reset during Li-ion battery discharge from 4.2V to 2.8V, while also supervising regulated 3.3V MCU supply. IC Role / Device Role / Timing Role: Primary VCC monitor (2.63V threshold) plus RESET IN configured for 3.3V rail monitoring. Use Value: Guarantees controlled shutdown before brownout-induced memory corruption - meets IEC 62304 safety requirements. |
Use Scenario: Powers ultra-low-power sensor node with coin-cell battery; monitors both battery voltage and LDO output. IC Role / Device Role / Timing Role: Uses VCC pin for direct battery sensing and RESET IN for regulated 1.8V rail monitoring. Use Value: Enables precise low-battery warning and graceful sleep entry by asserting reset before supply collapse disrupts ADC or radio operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT26D3-T | Same electrical specs but in 6-pin µDFN package - larger footprint, better thermal dissipation (θJA = 477°C/W vs. 322.6°C/W) | Suitable for thermally demanding industrial applications where SC70-4 may exceed junction limits | Select when board layout allows larger package and higher power dissipation margin is needed |
| MAX6326XR26D3-T | Single-supply monitor only (no RESET IN); same 2.63V threshold, 140ms timeout, SC70-3 package - lacks dual-monitoring capability | Applicable only where only VCC supervision is required - no secondary voltage monitoring support | Choose for cost-sensitive, single-rail designs where auxiliary monitoring is unnecessary |
Compared with MAX6387XS26D3-T, the LT version offers superior thermal performance in high-ambient environments, while the MAX6326 variant reduces BOM count and board area in simpler single-supply systems - neither provides the dual-monitoring functionality essential for coordinated multi-rail reset sequencing.
Availability
MAX6387XS26D3-T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, medical infusion pumps, and battery-powered IoT nodes requiring stable component supply, AEC-Q100-aligned qualification, and long-term production continuity.
Supply support for MAX6387XS26D3-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 industrial, automotive, communications, and computing markets - emphasizing reliability, low power, and integration.
The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits targeting space- and power-constrained embedded systems needing guaranteed reset behavior across extended temperature ranges.
FAQ
What is the exact reset threshold voltage of MAX6387XS26D3-T?
The MAX6387XS26D3-T has a factory-set nominal VCC reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet and applies specifically to the "26" suffix in the part number. The MAX6387XS26D3-T uses this fixed threshold to initiate reset when VCC falls below the specified level.
Does MAX6387XS26D3-T support monitoring of a second voltage rail?
Yes, the MAX6387XS26D3-T includes a dedicated RESET IN pin that connects to an internal 1.27V comparator reference. By applying a scaled-down version of a secondary voltage (e.g., 3.3V or 1.8V rail) via an external resistor divider, the MAX6387XS26D3-T can assert reset if either VCC < 2.63V or the RESET IN voltage < 1.27V - enabling true dual-rail supervision in a single device.
What is the function of the RESET output on MAX6387XS26D3-T?
The RESET output of the MAX6387XS26D3-T is an active-low push-pull driver, meaning it actively pulls the line low during reset and actively drives it high upon deassertion. This eliminates the need for an external pullup resistor and ensures fast, clean transitions compatible with standard CMOS/TTL microprocessor reset inputs. The MAX6387XS26D3-T guarantees valid logic states down to VCC = 1.0V.
What package type and dimensions does MAX6387XS26D3-T use?
The MAX6387XS26D3-T is packaged in a lead-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098), with footprint dimensions of 2.0mm × 2.1mm and height of 0.95mm. Its land pattern is documented as 90-0187, and thermal resistance is θJA = 322.6°C/W on a multilayer board - making it suitable for compact, thermally constrained PCB layouts.
How does the reset timeout period of MAX6387XS26D3-T compare to other variants in the family?
The MAX6387XS26D3-T implements the "D3" reset timeout option, providing a minimum reset pulse width of 140ms after VCC recovers above 2.63V. This is distinct from shorter (e.g., D1 = 1ms) or longer (e.g., D4 = 1120ms) timeouts offered in other members of the MAX6381–MAX6390 family. The 140ms value balances sufficient hold time for most microcontrollers against minimal delay in system startup - a key parameter encoded in the "D3" suffix of MAX6387XS26D3-T.
MAX6387XS26D3-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:
- 2.63V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6387XS26D3-T FAQ
1.How can I place an order for MAX6387XS26D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS26D3-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 MAX6387XS26D3-T reliable?
The price and inventory of MAX6387XS26D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS26D3-T is usually 5 days.
3.What payment methods are accepted for MAX6387XS26D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS26D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS26D3-T?
MAX6387XS26D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS26D3-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 MAX6387XS26D3-T?
For technical support, including MAX6387XS26D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS26D3-T requirements.
6.How does Aetrix verify that MAX6387XS26D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS26D3-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 MAX6387XS26D3-T meets industry standards.
7.What is the process for return or replacement of MAX6387XS26D3-T?
All MAX6387XS26D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS26D3-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 MAX6387XS26D3-T part is unused and in its original packaging.
Return procedure for MAX6387XS26D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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