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Analog Devices Inc./Maxim Integrated MAX6387XS22D3-T
- Part No.:
- MAX6387XS22D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS22D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,799
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Product details
Overview
MAX6387XS22D3-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, auxiliary RESET IN input for secondary voltage monitoring, and factory-set 2.19V VCC reset threshold (±2.5% over –40°C to +125°C). It consumes only 3μA at 1.8V, provides 140ms minimum VCC reset timeout, and operates down to VCC = 1.0V - used in battery-powered dual-rail systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6387XS22D3-T datasheet, MAX6387XS22D3-T pinout, MAX6387XS22D3-T application, or MAX6387XS22D3-T equivalent, key selection criteria include its 2.19V reset threshold accuracy, 140ms timeout timing, 4-pin SC70 package footprint, auxiliary voltage monitoring capability, and compatibility with low-voltage core/I/O rail supervision in portable and automotive-qualified designs.
Technical Context
The MAX6387XS22D3-T integrates two independent reset comparators: one monitors VCC against a precision 2.19V internal threshold, while the second compares an external voltage applied to RESET IN against a stable 1.27V reference. Reset assertion occurs if either voltage falls below its respective threshold, and the active-low push-pull output remains asserted for ≥140ms after recovery.
Its auxiliary RESET IN input supports user-defined thresholds via external resistor dividers (e.g., 1.8V or 3.3V rails), enabling dual-supply monitoring without additional ICs. The device guarantees valid reset logic states down to VCC = 1.0V and exhibits immunity to negative-going VCC transients up to 100µs at 200mV overdrive, per characterization data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V ±2.5% (–40°C to +125°C); ensures accurate brownout detection for 2.2V nominal supplies |
| RESET Timeout Period | 140ms minimum; guarantees sufficient μP initialization time after power stabilization |
| Supply Current | 3μA at VCC = 1.8V; enables multi-year operation in coin-cell–powered devices |
| RESET Output Type | Active-low push-pull; eliminates need for external pullup and drives standard CMOS inputs directly |
| Auxiliary Input | RESET IN with 1.27V reference; supports adjustable secondary voltage monitoring via resistor divider |
| Operating Voltage Range | 1.0V to 5.5V; allows operation during deep brownout and compatibility with wide supply rails |
| Reset Propagation Delay | 35µs (VCC falling); ensures fast response to supply collapse without false triggering |
Pinout & Package
MAX6387XS22D3-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 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input; powers internal circuitry and serves as primary reset monitor input |
| 2 | RESET | Active-low push-pull output; asserts low during VCC or RESET IN undervoltage and holds for 140ms post-recovery |
| 3 | GND | Analog/digital ground reference; must be connected to system ground plane for noise immunity |
| 4 | RESET IN | Auxiliary voltage monitor input; compared to 1.27V internal reference; high-impedance (≤50nA leakage) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset comparators | Simultaneously monitors VCC and external rail via RESET IN - eliminates need for second supervisor IC in dual-supply systems |
| Factory-trimmed 2.19V threshold | ±2.5% accuracy over full temperature range ensures robust brownout detection without calibration |
| 140ms guaranteed reset timeout | Meets JEDEC JESD8-12E requirements for μP reset hold time in low-power embedded applications |
| 1.0V minimum operating voltage | Guarantees correct reset state assertion even during severe brownout, preventing premature μP release |
| Negative transient immunity | Withstands ≤100µs VCC glitches down to 200mV below threshold - reduces false resets in noisy environments |
Applications
| Power Sequencing in Dual-Rail Microcontrollers | Battery-Powered IoT Sensor Nodes |
|---|---|
Use Scenario: Coordinating startup of core (1.8V) and I/O (3.3V) supplies in ARM Cortex-M microcontrollers. IC Role / Device Role / Timing Role: MAX6387XS22D3-T monitors both rails - VCC for 1.8V core, RESET IN for 3.3V I/O - asserting reset until both stabilize. Use Value: Ensures deterministic boot sequence without external timing components or firmware intervention. | Use Scenario: Maintaining reliable reset during lithium coin-cell discharge from 3.0V to 1.8V. IC Role / Device Role / Timing Role: MAX6387XS22D3-T's 2.19V threshold and 140ms timeout guarantee clean reset before brownout-induced code corruption. Use Value: Extends usable battery life by enabling operation down to 1.8V while preserving system integrity. |
| Automotive Body Control Modules | Industrial Programmable Logic Controllers |
Use Scenario: Supervising 5V system rail and 3.3V MCU supply in AEC-Q100–qualified body electronics. IC Role / Device Role / Timing Role: MAX6387XS22D3-T provides dual-rail monitoring with guaranteed operation from –40°C to +125°C. Use Value: Meets ASIL-B functional safety prerequisites for reset assurance without redundant hardware. | Use Scenario: Protecting FPGA configuration memory during AC/DC converter output ripple events. IC Role / Device Role / Timing Role: MAX6387XS22D3-T's 35µs propagation delay and 100µs transient immunity prevent spurious resets from line noise. Use Value: Eliminates field failures caused by power-supply-induced configuration loss in harsh EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT22D3-T | Same electrical specs but in 6-pin µDFN package; higher thermal resistance (θJA = 477°C/W vs. 322.6°C/W) | Preferred for thermally demanding layouts where SC70 thermal limits are exceeded | Select when board layout requires larger pad area or improved heat dissipation under sustained load |
| TLV809K22DBZR | Single-supply monitor only; no RESET IN input; 2.2V threshold; 140ms timeout; SOT-23-3 package | Lacks auxiliary voltage monitoring - suitable only for single-rail systems | Choose only if dual-supply supervision is unnecessary and board space permits SOT-23 footprint |
Compared with MAX6387LT22D3-T, the MAX6387XS22D3-T offers superior thermal performance in compact layouts; versus TLV809K22DBZR, it delivers critical dual-rail supervision capability absent in the TI part - making it irreplaceable in systems requiring coordinated core/I/O power-up sequencing.
Availability
MAX6387XS22D3-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, dual voltage systems, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6387XS22D3-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 - serving industrial, automotive, and communications markets since 1983.
The MAX6381–MAX6390 family was engineered specifically for ultra-low-power, dual-supply microprocessor supervision in space- and energy-constrained systems - emphasizing accuracy, small footprint, and guaranteed operation across automotive-grade temperatures.
FAQ
What is the exact reset threshold voltage of the MAX6387XS22D3-T?
The MAX6387XS22D3-T has a factory-set VCC reset threshold of 2.19V, with ±2.5% tolerance over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet (suffix "22"), and applies specifically to the VCC input - not the auxiliary RESET IN comparator, which uses a fixed 1.27V reference.
Does the MAX6387XS22D3-T support manual reset functionality?
No, the MAX6387XS22D3-T does not include a manual reset (MR) input. Per the Selector Guide and Pin Configurations, MR is only present on MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6387XS22D3-T is designated as a dual-monitoring device with VCC and RESET IN inputs, but no MR pin - its reset is fully automatic based on voltage conditions.
What package type and dimensions does the MAX6387XS22D3-T use?
The MAX6387XS22D3-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. It is RoHS-compliant ("+T" suffix), and its thermal resistance is θJA = 322.6°C/W on a multilayer board - significantly lower than the 6-pin µDFN variant, making it preferable for thermally dense layouts.
Can the MAX6387XS22D3-T monitor a 3.3V supply using its RESET IN pin?
Yes - the RESET IN pin compares the applied voltage to an internal 1.27V reference. To monitor a 3.3V rail, connect it through a resistor divider (e.g., R1 = 162kΩ, R2 = 100kΩ) so that 1.27V appears at RESET IN when the rail is at 3.3V. The MAX6387XS22D3-T will assert reset if the divided voltage drops below 1.27V, corresponding to ~3.3V at the rail - enabling precise secondary-supply supervision.
Is the MAX6387XS22D3-T qualified for automotive applications?
No - the MAX6387XS22D3-T is not AEC-Q100 qualified. While it operates from –40°C to +125°C, automotive qualification requires specific test protocols and traceability denoted by the "/V" suffix (e.g., MAX6387XS22D3/V+T). The "-T" suffix indicates tape-and-reel packaging only; no automotive stress testing or failure-rate reporting is performed on this variant.
MAX6387XS22D3-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:
- 2.19V, 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
MAX6387XS22D3-T FAQ
1.How can I place an order for MAX6387XS22D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS22D3-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 MAX6387XS22D3-T reliable?
The price and inventory of MAX6387XS22D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS22D3-T is usually 5 days.
3.What payment methods are accepted for MAX6387XS22D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS22D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS22D3-T?
MAX6387XS22D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS22D3-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 MAX6387XS22D3-T?
For technical support, including MAX6387XS22D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS22D3-T requirements.
6.How does Aetrix verify that MAX6387XS22D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS22D3-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 MAX6387XS22D3-T meets industry standards.
7.What is the process for return or replacement of MAX6387XS22D3-T?
All MAX6387XS22D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS22D3-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 MAX6387XS22D3-T part is unused and in its original packaging.
Return procedure for MAX6387XS22D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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