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Analog Devices Inc./Maxim Integrated MAX6405BS44-T
- Part No.:
- MAX6405BS44-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX6405BS44-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6405BS44-T from Maxim Integrated is an ultra-low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-trimmed 4.38V reset threshold (±2.5% over –40°C to +85°C), 100ms minimum reset timeout, and guaranteed reset validity down to VCC = 1.0V. It monitors regulated system voltages in portable battery-powered equipment where supply current below 1µA is critical.
For engineers reviewing the MAX6405BS44-T datasheet, MAX6405BS44-T pinout, MAX6405BS44-T application, or MAX6405BS44-T equivalent, key selection criteria include its 4.38V trip point, open-drain output configuration, UCSP-4 package compatibility with high-density layouts, and immunity to sub-200ns VCC transients.
Technical Context
The MAX6405BS44-T uses a precision bandgap reference comparator to monitor VCC against a factory-trimmed 4.38V threshold, asserting RESET low when VCC falls below that level. Its internal timer guarantees a minimum 100ms reset pulse after VCC rises above threshold, with hysteresis of 9.5mV to prevent chatter during brownout recovery.
It features a manual reset input (MR) with 50kΩ internal pullup, TTL/CMOS-compatible logic levels, and 1µs minimum MR pulse width. The open-drain RESET output requires an external pullup and interfaces directly with microcontrollers having bidirectional reset pins without additional logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.38V nominal, ±2.5% over –40°C to +85°C - ensures reliable power-on reset for 4.5V nominal systems with margin |
| Reset Timeout Period | 100ms (min), 280ms (max) - meets µP power-up initialization timing requirements across temperature |
| Supply Current | 1.0µA (max) at +85°C, 0.5µA (typ) at +25°C - enables multi-year battery life in always-on portable devices |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and full-system voltage scaling |
| Output Type | Active-low open-drain - allows wired-OR reset bus sharing and interface with bidirectional µP reset pins |
| VCC Transient Immunity | Rejects negative transients <100ns at 100mV overdrive - prevents false resets in noisy power environments |
| MR Input Logic | Active-low with 50kΩ internal pullup - eliminates external components for manual reset implementation |
Pinout & Package
MAX6405BS44-T is housed in a 4-bump (2×2 mm) UCSP chip-scale package (UCSP-4), offering 70% smaller footprint than SC70 and optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Ground reference for all internal circuitry and reset comparator |
| B1 | RESET | Open-drain active-low reset output; requires external pullup resistor to VCC or another rail |
| B2 | MR | Active-low manual reset input; internally pulled up to VCC (50kΩ); asserts reset when pulled to GND |
| A2 | VCC | Supply voltage input and monitored rail; powers device and serves as reset threshold reference source |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.38V threshold | Eliminates external resistor divider and calibration, reducing BOM count and layout area |
| Ultra-low 0.5µA typical supply current | Extends battery runtime in always-on monitoring applications such as smart sensors and wearables |
| Guaranteed reset assertion down to VCC = 1.0V | Ensures deterministic reset behavior during deep brownout or backup battery switchover |
| Open-drain output with no internal pullup | Enables flexible voltage-level translation and shared reset bus architectures |
| 100ms minimum reset timeout | Meets JEDEC JESD78 and common µP reset timing specifications without external timing components |
Applications
| Cell Phones | MP3 Players |
|---|---|
Use Scenario: Power management during battery discharge and charger insertion events. IC Role / Device Role / Timing Role: Monitors main PMIC output rail and asserts reset if voltage drops below 4.38V during low-battery cutoff or USB power negotiation. Use Value: Prevents corrupted firmware execution during unstable power transitions, improving boot reliability. |
Use Scenario: Ensuring clean startup and recovery after accidental power loss during audio playback. IC Role / Device Role / Timing Role: Supervises 4.5V system rail and holds µP in reset until stable; manual reset via button connects to MR pin. Use Value: Eliminates need for RC-based reset circuits, saving PCB area and improving timing consistency. |
| Pagers | PDAs |
Use Scenario: Maintaining data integrity during intermittent battery contact or cold-temperature operation. IC Role / Device Role / Timing Role: Provides fail-safe reset under marginal VCC conditions (down to 1.2V), with open-drain output compatible with legacy baseband processors. Use Value: Guarantees known processor state before RF transmission begins, reducing missed message risk. |
Use Scenario: Coordinating reset sequencing between application processor, memory, and peripheral controllers. IC Role / Device Role / Timing Role: Generates synchronized reset pulse across multiple voltage domains using shared open-drain bus with pullup to highest rail. Use Value: Enables deterministic multi-chip power-up order without custom reset logic or FPGA intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6403BS44-T | Same 4.38V threshold and UCSP-4 package, but push-pull active-low output | Requires no external pullup; not suitable for wired-OR or bidirectional reset buses | Select when single-point reset drive is sufficient and board space permits slightly higher output drive current |
| TPS3808G33DBVR | 3.3V threshold, SOT-23-5 package, 1.8µA max ICC, 200ms timeout | Higher supply current and fixed 3.3V trip unsuitable for 4.5V systems; different pinout and package | Consider only if redesigning for lower-voltage rails and requiring longer timeout or different thermal profile |
Compared with MAX6405BS44-T, MAX6403BS44-T offers simpler drive but sacrifices bus-sharing capability, while TPS3808G33DBVR targets different voltage domains and lacks the ultra-low ICC and 1V reset guarantee essential for battery-critical designs.
Availability
MAX6405BS44-T is available at Aetrix Electronics and suitable for portable electronics, battery-powered medical sensors, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
Supply support for MAX6405BS44-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, sensing, and interface applications in demanding environments.
The MAX6400–MAX6405 family was engineered specifically for ultra-low-power microprocessor supervision in space- and energy-constrained portable systems, emphasizing minimal external components and guaranteed operation across wide voltage and temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX6405BS44-T?
The MAX6405BS44-T has a factory-trimmed nominal reset threshold of 4.38V, with tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). This value is confirmed in Table 1 of the datasheet and corresponds to the "44" suffix in the part number. At +25°C, the typical threshold is 4.38V, with min/max limits of 4.270V and 4.489V respectively.
Does the MAX6405BS44-T require an external pullup resistor on the RESET pin?
Yes, the MAX6405BS44-T features an open-drain RESET output and requires an external pullup resistor to function correctly. The datasheet specifies that the RESET pin must be pulled up to VCC or another appropriate rail; no internal pullup is provided. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements.
Can the MAX6405BS44-T operate reliably below 2.0V supply voltage?
Yes, the MAX6405BS44-T is guaranteed to assert a valid reset signal down to VCC = 1.0V, and its specified operating range begins at 1.2V. This capability ensures deterministic reset behavior during deep brownout conditions, backup battery switchover, or low-voltage wake-up sequences - a key differentiator from many competing supervisors.
What is the function of the MR pin on the MAX6405BS44-T?
The MR (Manual Reset) pin on the MAX6405BS44-T is an active-low input with a 50kΩ internal pullup resistor to VCC. Pulling MR to GND initiates a reset pulse lasting the full reset timeout period (≥100ms) after MR returns high. It supports direct connection to momentary switches or logic outputs without external components, and accepts TTL/CMOS-compatible voltage levels.
Is the MAX6405BS44-T pin-compatible with other members of the MAX6400–MAX6405 family?
Yes, all MAX6400–MAX6405 variants, including the MAX6405BS44-T, share identical UCSP-4 pinout (GND, RESET, MR, VCC) and footprint. However, output type differs: MAX6405BS44-T uses open-drain active-low, while MAX6403BS44-T uses push-pull active-low. Swapping them requires verifying reset bus topology and pullup requirements.
MAX6405BS44-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:
- 4.38V
- Output:
- Open Drain or Open Collector
- 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)
MAX6405BS44-T FAQ
1.How can I place an order for MAX6405BS44-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6405BS44-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 MAX6405BS44-T reliable?
The price and inventory of MAX6405BS44-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6405BS44-T is usually 5 days.
3.What payment methods are accepted for MAX6405BS44-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6405BS44-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6405BS44-T?
MAX6405BS44-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6405BS44-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 MAX6405BS44-T?
For technical support, including MAX6405BS44-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6405BS44-T requirements.
6.How does Aetrix verify that MAX6405BS44-T is sourced from the original manufacturer or authorized distributors?
All MAX6405BS44-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 MAX6405BS44-T meets industry standards.
7.What is the process for return or replacement of MAX6405BS44-T?
All MAX6405BS44-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6405BS44-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 MAX6405BS44-T part is unused and in its original packaging.
Return procedure for MAX6405BS44-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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