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Analog Devices Inc./Maxim Integrated MAX6405BS46-T
- Part No.:
- MAX6405BS46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX6405BS46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6405BS46-T from Maxim Integrated is an ultra-low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-trimmed 4.63V reset threshold (±2.5% over –40°C to +85°C), 100ms minimum reset timeout, and 500nA typical supply current at 3.0V. It monitors regulated system voltages in portable battery-powered equipment where reliable power-on reset and brownout protection are critical.
For engineers reviewing the MAX6405BS46-T datasheet, MAX6405BS46-T pinout, MAX6405BS46-T application, or MAX6405BS46-T equivalent, this device delivers precise voltage supervision with guaranteed reset validity down to VCC = 1.0V, immunity to fast VCC transients, manual reset input support, and compatibility with bidirectional µP reset pins via external pullup.
Technical Context
The MAX6405BS46-T implements a precision bandgap reference comparator with factory-trimmed 4.63V threshold and 9.5mV hysteresis, ensuring stable reset assertion during voltage sags. Its open-drain RESET output requires an external pullup and interfaces directly with microcontrollers having bidirectional reset pins.
It features a manual reset input (MR) with internal 50kΩ pullup, 1µs minimum pulse width requirement, and 100ns glitch rejection. The device guarantees correct logic state for VCC as low as 1.0V and ignores transients shorter than 200ns at full overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.63V nominal, ±2.5% over –40°C to +85°C - ensures accurate brownout detection for 4.5V–5.0V systems |
| Reset Output Type | Active-low open-drain - enables wired-OR reset bus and direct interface with bidirectional µP reset pins |
| Supply Current | 500nA typical at 3.0V - extends battery life in always-on portable devices like pagers and MP3 players |
| Reset Timeout Period | 100ms minimum - satisfies power-up stabilization requirements for most 8-/16-bit microcontrollers |
| VCC Operating Range | 1.2V to 5.5V - supports valid reset assertion even during deep brownout conditions down to 1.0V |
| MR Input Logic | Active-low with 50kΩ internal pullup - eliminates external components for manual reset; TTL/CMOS compatible |
| Reset Propagation Delay | 20µs max from VCC dip - provides rapid response to supply faults without false triggering on noise |
Pinout & Package
MAX6405BS46-T is housed in a 4-bump (2×2) UCSP chip-scale package (0.8mm × 0.8mm, 0.4mm pitch), 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; asserts low when VCC < 4.63V |
| B2 | MR | Active-low manual reset input - internal 50kΩ pullup to VCC; initiates reset on logic low |
| A2 | VCC | Supply voltage input and monitored rail - powers device and serves as reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V threshold | Eliminates external resistor dividers and calibration, reducing BOM count and layout area |
| Ultra-low 500nA supply current | Enables multi-year operation on coin-cell batteries in maintenance-free portable devices |
| Guaranteed reset validity to VCC = 1.0V | Ensures deterministic reset behavior during severe brownout or battery depletion |
| Immunity to short VCC transients | Rejects glitches ≤100ns, preventing spurious resets in electrically noisy environments |
| Manual reset input with internal pullup | Supports pushbutton reset without external components; simplifies board-level debug and field service |
Applications
| Cell Phones | MP3 Players |
|---|---|
Use Scenario: Power management during battery insertion, charging transitions, and RF transmit bursts causing supply sag. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to hold baseband processor in reset until stable 4.5V rail is confirmed. Use Value: Prevents boot corruption and firmware lockup during transient voltage drops common in GSM/EDGE power amplification cycles. |
Use Scenario: Cold start from depleted lithium-polymer battery and recovery after accidental power loss during audio playback. IC Role / Device Role / Timing Role: Monitors main 4.6V regulated rail and holds DSP core in reset until voltage exceeds 4.63V for ≥100ms. Use Value: Guarantees clean initialization of flash memory controller and audio codec, eliminating silent boot or corrupted playlist loading. |
| Pagers | PDAs |
Use Scenario: Long-term storage with self-discharge leading to sub-threshold VCC upon power-on. IC Role / Device Role / Timing Role: Provides power-on reset with guaranteed assertion down to VCC = 1.0V, enabling reliable wake-from-storage. Use Value: Ensures real-time clock and memory retention circuits initialize correctly despite deep battery discharge. |
Use Scenario: Hot-swap of CompactFlash or SD cards causing momentary 5V rail disturbance. IC Role / Device Role / Timing Role: Detects 4.63V rail collapse and asserts open-drain RESET to halt CPU execution before data corruption occurs. Use Value: Enables safe card insertion/removal by synchronizing reset assertion with power rail integrity monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR46-T | Same 4.63V threshold, push-pull active-low output, 1.6µA ICC (vs. 0.5µA) | Requires no external pullup but draws >3× more quiescent current | Select when board layout prohibits external pullup or when higher drive strength is needed |
| TPS3808G33DBVR | 3.3V threshold, not 4.63V; SOT-23-5 package; 1.5µA ICC | Not a voltage-match alternative; suitable only if system rail is 3.3V, not 4.6V | Choose only for 3.3V systems; requires redesign of reset threshold and PCB footprint |
Compared with MAX6405BS46-T, MAX6326UR46-T offers pin-compatible push-pull drive but sacrifices ultra-low power for simplicity, while TPS3808G33DBVR serves a different voltage class entirely and demands full schematic and layout revision.
Availability
MAX6405BS46-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, cell phones, and MP3 players requiring stable component supply with long-lifecycle support and consistent parametric performance.
Supply support for MAX6405BS46-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 voltage supervision in space-constrained portable electronics, emphasizing minimal footprint, nanoscale quiescent current, and factory-trimmed accuracy without external components.
FAQ
What is the exact reset threshold voltage of the MAX6405BS46-T?
The MAX6405BS46-T has a factory-trimmed nominal reset threshold voltage of 4.63V, with tolerance of ±2.5% over the full operating temperature range of –40°C to +85°C. This value is confirmed in Table 1 of the datasheet and corresponds to the "46" suffix in the part number. The MAX6405BS46-T is specifically selected for systems powered by 4.5V–5.0V rails where precise brownout detection is required.
Does the MAX6405BS46-T require an external pullup resistor on its RESET pin?
Yes, the MAX6405BS46-T features an open-drain RESET output and requires an external pullup resistor to the system VCC rail. This configuration enables wired-OR reset bus architectures and direct interfacing with microcontrollers that have bidirectional reset pins. The datasheet confirms this requirement in the Pin Description and Applications Information sections. Without the pullup, the MAX6405BS46-T cannot assert a valid high-level signal on RESET.
Can the MAX6405BS46-T operate reliably when VCC drops below 2.0V?
Yes, the MAX6405BS46-T guarantees correct reset output logic state for VCC down to 1.0V, as explicitly stated in the General Description and Electrical Characteristics tables. Its internal circuitry remains functional and asserts RESET low whenever VCC falls below 4.63V-even at 1.2V supply-making it suitable for deep brownout recovery in battery-powered devices. This behavior is validated across –40°C to +85°C.
What is the function of the MR pin on the MAX6405BS46-T?
The MR (Manual Reset) pin on the MAX6405BS46-T is an active-low input with an internal 50kΩ pullup resistor to VCC. Driving MR low initiates a reset pulse that remains asserted for the full 100ms timeout period, even after MR returns high. This allows pushbutton-based system reset without external components. The MAX6405BS46-T datasheet specifies 1µs minimum pulse width and 100ns glitch rejection on MR.
Is the MAX6405BS46-T compatible with bidirectional microcontroller reset pins?
Yes, the MAX6405BS46-T is explicitly designed for interoperability with bidirectional µP reset pins due to its open-drain RESET output. When connected with a single external pullup resistor, both the MAX6405BS46-T and the microcontroller can drive the shared reset line low - enabling coordinated reset initiation from either device. This capability is documented in the Applications Information section and Figure 2 of the MAX6405BS46-T datasheet.
MAX6405BS46-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:
- 4.63V
- 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)
MAX6405BS46-T FAQ
1.How can I place an order for MAX6405BS46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6405BS46-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 MAX6405BS46-T reliable?
The price and inventory of MAX6405BS46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6405BS46-T is usually 5 days.
3.What payment methods are accepted for MAX6405BS46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6405BS46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6405BS46-T?
MAX6405BS46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6405BS46-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 MAX6405BS46-T?
For technical support, including MAX6405BS46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6405BS46-T requirements.
6.How does Aetrix verify that MAX6405BS46-T is sourced from the original manufacturer or authorized distributors?
All MAX6405BS46-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 MAX6405BS46-T meets industry standards.
7.What is the process for return or replacement of MAX6405BS46-T?
All MAX6405BS46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6405BS46-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 MAX6405BS46-T part is unused and in its original packaging.
Return procedure for MAX6405BS46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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