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Analog Devices Inc./Maxim Integrated MAX6400BS31-T
- Part No.:
- MAX6400BS31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX6400BS31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6400BS31-T from Maxim Integrated is an ultra-low-power microprocessor supervisory circuit designed to monitor VCC supply voltage and assert a reset signal when voltage drops below the factory-trimmed 3.08V threshold. It features active-low push-pull RESET output, manual reset (MR) input with internal 50kΩ pullup, guaranteed operation down to VCC = 1.0V, and 500nA typical supply current - enabling reliable power-on/brownout protection in space-constrained portable systems.
For engineers reviewing the MAX6400BS31-T datasheet, MAX6400BS31-T pinout, MAX6400BS31-T application, or MAX6400BS31-T equivalent, this device serves as a precision, low-quiescent-current reset supervisor for battery-powered microcontroller systems requiring stable 3.08V threshold detection, immunity to short VCC transients, and minimal board area in UCSP-4 packaging.
Technical Context
The MAX6400BS31-T implements a precision bandgap reference comparator with ±2.5% threshold accuracy over –40°C to +85°C, and includes an internal timer that guarantees a minimum 100ms reset timeout period after VCC rises above VTH. Its reset assertion logic is strictly active-low push-pull, with VOL ≤ 0.4V at ISINK = 100µA and VCC ≥ 1.2V.
It incorporates glitch rejection on MR (100ns), supports manual reset pulse widths as short as 1µs, and maintains valid reset state during fast negative-going VCC transients up to 200µs (at 100mV overdrive). The device requires no external components and operates across VCC = 1.2V to 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 3.08V ±2.5% (–40°C to +85°C); ensures deterministic brownout detection at precisely defined supply level |
| Supply Current (ICC) | 500nA typical at VCC = 3.0V; enables multi-year battery life in always-on portable devices |
| Reset Timeout Period (tRP) | 100ms (min) to 280ms (max); provides sufficient time for microcontroller initialization before release | Output Type | Active-low push-pull; drives RESET low without external pullup, compatible with standard µP reset inputs |
| MR Input Logic | Active-low with internal 50kΩ pullup to VCC; allows direct switch-to-GND connection with no external components |
| Operating Voltage Range | VCC = 1.2V to 5.5V; supports wide-input systems including single-cell Li-ion and 3.3V/5V rails |
| Reset Valid Down To | VCC = 1.0V; guarantees correct reset state even during deep brownout or battery depletion |
Pinout & Package
Package: UCSP-4 (4-bump, 2×2 mm chip-scale package), tape-and-reel only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (A1) | Ground reference | Primary return path for internal comparator and output driver; must be low-impedance connection |
| RESET (B1) | Active-low push-pull reset output | Drives low during reset assertion; sinks current to hold µP in reset; no external pullup required |
| MR (B2) | Manual reset input | Active-low; internally pulled up to VCC; asserts reset when pulled to GND for ≥1µs |
| VCC (A2) | Supply and monitored voltage input | Powers device and serves as input to threshold comparator; monitors system rail directly |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 500nA typical enables >10-year battery life in coin-cell-powered IoT sensors |
| Factory-trimmed VTH | 3.08V threshold set at wafer level - eliminates calibration and external resistors |
| Guaranteed reset at 1.0V | Ensures fail-safe behavior during deep undervoltage, critical for data retention in flash-based µCs |
| No external components | Reduces BOM count, PCB area, and assembly cost - ideal for wearables and compact modules |
| MR glitch rejection | 100ns noise immunity prevents spurious resets from EMI or switch bounce |
Applications
| Cell Phones | MP3 Players |
|---|---|
Use Scenario: Power sequencing during cold start and battery voltage sag during RF transmission. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to hold baseband processor in known state until VCC stabilizes above 3.08V. Use Value: Prevents boot corruption and firmware lockup caused by marginal supply conditions during high-current bursts. | Use Scenario: Maintaining system integrity during intermittent battery drain from audio decoding and display backlighting. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and holds application MCU in reset for ≥100ms after voltage recovery. Use Value: Eliminates need for software-initiated watchdog recovery, reducing firmware complexity and boot-time latency. |
| Pagers | PDAs |
Use Scenario: Long-term storage with aging alkaline batteries exhibiting gradual voltage decay. IC Role / Device Role / Timing Role: Precision 3.08V threshold detection with ±2.5% accuracy over temperature ensures consistent reset point across operating life. Use Value: Avoids premature shutdown or erratic operation as battery voltage declines below functional minimum. | Use Scenario: Multi-rail systems where 3.3V core logic powers CPU and memory, while other rails supply peripherals. IC Role / Device Role / Timing Role: Dedicated VCC monitoring of 3.3V domain with push-pull output directly interfacing ARM7 reset pin. Use Value: Enables clean hardware reset independent of PMIC sequencing, improving system reliability during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | Fixed 1.8V threshold; 1.8µA ICC; SOT-23-5 package | Targets lower-voltage logic domains (e.g., 1.8V I/O), not 3.08V system rails | Select only if system VCC is near 1.8V and higher quiescent current is acceptable |
| ADM6315-31ARTZ-R7 | 3.08V threshold; 1.2µA ICC; SOT-23-3 package; open-drain output | Lacks manual reset input and push-pull drive; requires external pullup resistor | Choose when board layout constraints favor SOT-23 and open-drain flexibility is needed |
Compared with TPS3123E18DBVR and ADM6315-31ARTZ-R7, the MAX6400BS31-T delivers 99.9% lower supply current than the ADM6315 and matches the exact 3.08V threshold of the ADM6315 while adding push-pull drive and MR functionality - making it optimal for ultra-low-power, space-constrained 3.3V portable designs.
Availability
MAX6400BS31-T is available at Aetrix Electronics and suitable for portable electronics, battery-powered medical sensors, and compact industrial controllers requiring stable component supply, long-lifecycle support, and verified UCSP-4 packaging performance.
Supply support for MAX6400BS31-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6400–MAX6405 family was designed specifically for ultra-low-power microprocessor supervision in battery-critical portable equipment, emphasizing sub-µA quiescent current, factory-trimmed precision thresholds, and minimal footprint via UCSP packaging.
FAQ
What is the exact reset threshold voltage of the MAX6400BS31-T?
The MAX6400BS31-T has a factory-trimmed nominal reset threshold of 3.08V, with ±2.5% accuracy over the full operating temperature range of –40°C to +85°C. At +25°C, the typical threshold is 3.08V, and the min/max limits are 3.003V and 3.150V respectively, as specified in Table 1 of the datasheet.
Does the MAX6400BS31-T require external components to operate?
No, the MAX6400BS31-T requires no external components. Its precision bandgap reference, comparator, and timing circuitry are fully integrated. The MR input includes an internal 50kΩ pullup resistor, and the active-low push-pull RESET output drives directly into a microcontroller reset pin without needing a pullup resistor - simplifying design and reducing BOM count.
What is the minimum VCC voltage at which the MAX6400BS31-T guarantees correct reset output state?
The MAX6400BS31-T guarantees correct reset output logic state down to VCC = 1.0V. This means RESET remains asserted (low) even as the supply decays deeply, ensuring the microcontroller stays held in reset during severe brownout or battery depletion - a key reliability feature for data-critical portable systems.
How does the manual reset (MR) function work on the MAX6400BS31-T?
The MR input on the MAX6400BS31-T is active-low with an internal 50kΩ pullup to VCC. Pulling MR to GND for ≥1µs asserts RESET low. RESET remains low for the full reset timeout period (≥100ms) after MR returns high. If MR is left unconnected, the internal pullup holds it high and disables manual reset functionality.
Is the MAX6400BS31-T pin-compatible with other members of the MAX6400–MAX6405 family?
Yes, all MAX6400–MAX6405 variants, including the MAX6400BS31-T, share identical UCSP-4 pinout (GND, RESET, MR, VCC) and electrical interface. However, output logic type (push-pull vs. open-drain), reset polarity (active-low vs. active-high), and threshold voltage differ by part number - so substitution requires verification of those parameters, not just pin compatibility.
MAX6400BS31-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 4-WFBGA, CSPBGA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UCSP (1.05x1.05)
MAX6400BS31-T FAQ
1.How can I place an order for MAX6400BS31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6400BS31-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 MAX6400BS31-T reliable?
The price and inventory of MAX6400BS31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6400BS31-T is usually 5 days.
3.What payment methods are accepted for MAX6400BS31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6400BS31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6400BS31-T?
MAX6400BS31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6400BS31-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 MAX6400BS31-T?
For technical support, including MAX6400BS31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6400BS31-T requirements.
6.How does Aetrix verify that MAX6400BS31-T is sourced from the original manufacturer or authorized distributors?
All MAX6400BS31-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 MAX6400BS31-T meets industry standards.
7.What is the process for return or replacement of MAX6400BS31-T?
All MAX6400BS31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6400BS31-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 MAX6400BS31-T part is unused and in its original packaging.
Return procedure for MAX6400BS31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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