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Analog Devices Inc./Maxim Integrated MAX6387XS16D3+T
- Part No.:
- MAX6387XS16D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS16D3+T.pdf
- Description:
- IC MPU/RESET CIRC 1.58V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,123
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Product details
Overview
MAX6387XS16D3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, 1.58V factory-set VCC reset threshold, 140ms minimum VCC reset timeout, and auxiliary RESET IN input for monitoring a second voltage rail. It operates from +1.0V to +5.5V supply, consumes only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - used in portable battery-powered equipment requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX6387XS16D3+T datasheet, MAX6387XS16D3+T pinout, MAX6387XS16D3+T application, or MAX6387XS16D3+T equivalent, key selection considerations include its 4-pin SC70 package, ±2.5% reset threshold accuracy over –40°C to +125°C, dual-supply monitoring capability via RESET IN, and compatibility with systems needing guaranteed reset assertion during low-VCC conditions.
Technical Context
The MAX6387XS16D3+T integrates two independent voltage comparators: one monitors VCC against a fixed 1.58V threshold (±2.5% over temperature), while the other compares an external voltage applied to RESET IN against an internal +1.27V reference. Reset asserts if either comparator trips, and remains asserted for 140ms after recovery.
Its push-pull active-low RESET output drives directly without external pullup, supports sink currents up to 3.2mA at VCC ≥ 4.5V, and maintains logic validity down to VCC = 1V - enabling robust reset signaling even during deep brownout events in low-power embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.58V (factory-set, ±2.5% over –40°C to +125°C) - ensures precise power-fail detection for 1.8V core rails. |
| RESET Timeout Period | 140ms (min) - provides sufficient hold time for μP initialization after power stabilization. |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in always-on monitoring applications. |
| Operating Voltage Range | +1.0V to +5.5V - supports operation during severe brownout and compatibility with wide-input systems. |
| RESET IN Threshold | +1.27V (±2.5% over temperature) - allows user-adjustable secondary voltage monitoring via resistor divider. |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup resistor and simplifies PCB layout. |
| Package | 4-pin SC70 (X4+1 outline) - ultra-compact footprint ideal for space-constrained portable designs. |
Pinout & Package
MAX6387XS16D3+T is housed in a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), with pins arranged as follows:
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and sets main reset threshold. |
| 2 | RESET | Active-low push-pull reset output; asserts low when VCC or RESET IN falls below threshold and holds for 140ms post-recovery. |
| 3 | GND | Analog/digital ground reference; must be connected to system ground plane for accurate threshold sensing. |
| 4 | RESET IN | Auxiliary voltage monitor input; high-impedance node compared to +1.27V reference - enables dual-rail supervision without extra ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC and external rail via RESET IN - reduces BOM count in multi-supply systems like SoC-based IoT nodes. |
| Low-power operation | 3μA supply current at +1.8V - extends battery runtime in wearables and remote sensors where duty-cycled wake-up is critical. |
| Guaranteed reset validity | RESET output remains logically valid down to VCC = 1V - prevents spurious release during deep undervoltage transients. |
| Negative-going transient immunity | Rejects VCC glitches ≤ 35µs at 100mV overdrive - improves reliability in electrically noisy automotive or industrial environments. |
| Factory-trimmed precision | ±2.5% reset threshold accuracy over full temperature range - eliminates need for external calibration in production test. |
Applications
| Portable Power Management | Dual-Rail Embedded Systems |
|---|---|
Use Scenario: Supervising both core (1.8V) and I/O (3.3V) supplies in Bluetooth LE modules powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary reset generator ensuring μP boots only after both rails stabilize; RESET IN monitors I/O rail while VCC monitors core rail. Use Value: Prevents firmware corruption during asymmetric power-up sequences and extends battery life via sub-μA quiescent current. | Use Scenario: Monitoring VCORE and VDDIO in FPGA-based edge AI accelerators where supply sequencing errors cause configuration failure. IC Role / Device Role / Timing Role: Dual-comparator supervisor providing independent fault detection on two critical rails with shared reset assertion. Use Value: Eliminates need for two discrete reset ICs, reducing board area by 50% and improving timing correlation between rail failures. |
| Battery-Powered Medical Sensors | Industrial Control HMI Panels |
Use Scenario: Ensuring safe startup of ECG front-end ASICs operating from single Li-ion cell (2.7–4.2V) with backup LDO for analog section. IC Role / Device Role / Timing Role: VCC monitors main LDO output; RESET IN monitors backup rail voltage to guarantee reset if either supply fails. Use Value: Meets IEC 60601-1 safety requirement for fail-safe power monitoring with no external components. | Use Scenario: Supervising 5V system rail and 3.3V communication interface rail in DIN-rail mounted PLC HMI units exposed to 125°C ambient. IC Role / Device Role / Timing Role: High-temp qualified supervisor (–40°C to +125°C) asserting reset if either rail drops below threshold during thermal stress. Use Value: Maintains ±2.5% threshold accuracy across full industrial temperature range, avoiding false resets in hot enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT16D3+T | Same electrical specs but in 6-pin μDFN (L611+1) instead of 4-pin SC70; includes NC pins not present in SC70 variant. | Requires different PCB footprint and land pattern; better thermal performance (θJA = 477°C/W vs. 322.6°C/W) but larger area. | Select when thermal dissipation or board-level routing flexibility outweighs size constraints. |
| TPS3808G16DBVR | TI part with same 1.6V threshold and 140ms timeout, but open-drain RESET output requiring external pullup; higher 8μA supply current at 1.8V. | Lacks RESET IN input - cannot monitor dual rails without additional components; less suitable for compact dual-supply designs. | Choose only if open-drain interface is required or if TI supply chain preference dominates design requirements. |
Compared with MAX6387LT16D3+T, the MAX6387XS16D3+T saves 40% board area in SC70 format but trades off thermal margin; versus TPS3808G16DBVR, it delivers true dual-rail supervision and 60% lower quiescent current - making it optimal for miniaturized, battery-sensitive dual-supply systems.
Availability
MAX6387XS16D3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, dual voltage systems, intelligent instruments, and critical μP/μC power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX6387XS16D3+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 demanding industrial, automotive, and computing applications - emphasizing low power, high reliability, and small form factor.
The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for space-constrained, battery-operated, and high-temperature embedded systems where guaranteed reset behavior under brownout is essential.
FAQ
What is the exact reset threshold voltage of MAX6387XS16D3+T?
The MAX6387XS16D3+T has a factory-set VCC reset threshold of 1.58V, with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "16"), and applies specifically to the VCC comparator - not the RESET IN input, which references +1.27V.
Does MAX6387XS16D3+T support monitoring two independent voltage rails?
Yes, MAX6387XS16D3+T supports dual-rail monitoring: VCC is monitored against its 1.58V threshold, while the RESET IN pin accepts an external voltage and compares it to an internal +1.27V reference. Reset asserts if either rail falls below its respective threshold - enabling supervision of core and I/O supplies in a single 4-pin device.
What is the function of the RESET IN pin on MAX6387XS16D3+T?
The RESET IN pin on MAX6387XS16D3+T is a high-impedance input to a dedicated comparator referenced to +1.27V. When the voltage at RESET IN drops below this threshold, the device asserts its active-low RESET output. It is typically connected to a resistor divider to set a custom reset point for a secondary supply rail - a feature exclusive to MAX6387/MAX6388/MAX6389 variants.
Is MAX6387XS16D3+T pin-compatible with MAX809 or MAX6326?
No, MAX6387XS16D3+T is not pin-compatible with MAX809 or MAX6326. While the datasheet states pin compatibility *within the MAX6381–MAX6390 family* for same-package variants (e.g., MAX6387XSxxDx+T vs. MAX6384XSxxDx+T in 4-pin SC70), MAX809 uses 3-pin SOT23 and MAX6326 uses 5-pin SC70 - differing in pin count, function mapping, and package outline. Direct replacement requires PCB redesign.
What is the minimum VCC level at which MAX6387XS16D3+T guarantees correct RESET output logic state?
MAX6387XS16D3+T guarantees that its RESET output remains in the correct asserted or deasserted logic state down to VCC = 1.0V. This is explicitly specified in the Electrical Characteristics table and ensures reliable reset signaling during deep brownout conditions - a key differentiator from many competing supervisors that lose output validity below 1.5V.
MAX6387XS16D3+T 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.58V, 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
MAX6387XS16D3+T FAQ
1.How can I place an order for MAX6387XS16D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS16D3+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 MAX6387XS16D3+T reliable?
The price and inventory of MAX6387XS16D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS16D3+T is usually 5 days.
3.What payment methods are accepted for MAX6387XS16D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS16D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS16D3+T?
MAX6387XS16D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS16D3+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 MAX6387XS16D3+T?
For technical support, including MAX6387XS16D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS16D3+T requirements.
6.How does Aetrix verify that MAX6387XS16D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS16D3+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 MAX6387XS16D3+T meets industry standards.
7.What is the process for return or replacement of MAX6387XS16D3+T?
All MAX6387XS16D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS16D3+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 MAX6387XS16D3+T part is unused and in its original packaging.
Return procedure for MAX6387XS16D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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