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Analog Devices Inc./Maxim Integrated MAX6405BS44
- Part No.:
- MAX6405BS44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX6405BS44.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:706
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Product details
Overview
MAX6405BS44 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 operation down to VCC = 1.0V. It monitors regulated system voltages in portable battery-powered equipment where supply current and board space are critical.
For engineers reviewing the MAX6405BS44 datasheet, MAX6405BS44 pinout, MAX6405BS44 application, or MAX6405BS44 equivalent, key selection criteria include its 4-bump UCSP-4 package, 500nA typical supply current, immunity to short VCC transients, and compatibility with µPs featuring bidirectional reset pins requiring external pullup.
Technical Context
The MAX6405BS44 uses a precision bandgap reference comparator to monitor VCC against a fixed 4.38V threshold. Its open-drain RESET output requires an external pullup resistor and interfaces directly with microcontrollers having bidirectional reset pins.
Reset assertion occurs when VCC falls below 4.38V, and RESET remains low for ≥100ms after VCC rises above threshold. The manual reset input (MR) features a 50kΩ internal pullup and supports TTL/CMOS logic levels, with glitch rejection up to 100ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±2.5% (–40°C to +85°C); ensures reliable brownout detection at nominal 4.38V supply rails |
| Supply Current | 500nA typical at +25°C; enables multi-year battery life in always-on portable devices |
| Reset Timeout Period | 100ms minimum; meets JEDEC JESD79-3 power-up timing requirements for most µPs |
| Operating Voltage Range | 1.2V to 5.5V (–40°C to +85°C); supports valid reset assertion even during deep brownout down to 1.0V |
| Output Type | Active-low open-drain; allows wired-OR configuration and direct interface with bidirectional µP reset pins |
| MR Input Logic | Active-low with 50kΩ internal pullup; eliminates need for external biasing when unused |
| Reset Delay (tRD) | 20µs max; rejects fast VCC transients ≤20µs duration at 100mV overdrive |
Pinout & Package
Package: 4-bump UCSP (2×2 mm), lead-free, tape-and-reel only. Compatible with standard SMT reflow profiles (peak 235°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for internal comparator and reset logic; must be low-impedance connection |
| RESET | Open-drain active-low reset output | Requires external pullup resistor (typically 10–100kΩ); sinks 1.2mA min when asserted |
| MR | Active-low manual reset input | Internally pulled up to VCC (50kΩ); asserts reset when pulled ≤0.2×VCC; immune to <100ns glitches |
| VCC | Supply voltage and monitored rail | Input to precision bandgap comparator; powers device and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small UCSP-4 package | 2×2 mm footprint - 70% smaller than SC70, enabling high-density portable PCB layouts |
| Factory-trimmed 4.38V threshold | No external calibration needed; eliminates production test adjustments and reduces BOM count |
| Guaranteed reset validity to 1.0V | Ensures deterministic reset behavior during deep brownout or battery depletion scenarios |
| Immunity to short VCC transients | Rejects noise spikes ≤20µs duration, preventing spurious resets in electrically noisy environments |
| No external components required | Integrates precision reference, comparator, timer, and MR pullup - reduces bill-of-materials and layout area |
Applications
| Cell Phones | MP3 Players |
|---|---|
Use Scenario: Power management during battery discharge and USB charging transitions. IC Role / Device Role / Timing Role: Monitors main 4.2V Li-ion battery rail and asserts reset if voltage drops below 4.38V during load surge or aging. Use Value: Prevents corrupted firmware execution during marginal battery conditions without adding external resistors or capacitors. |
Use Scenario: Reliable boot sequencing after cold start or wake-from-sleep with varying supply stability. IC Role / Device Role / Timing Role: Provides 100ms minimum reset pulse to ensure DSP and audio codec initialization completes before code execution. Use Value: Eliminates need for RC-based reset timers, improving timing accuracy and reducing component count. |
| Pagers | PDAs |
Use Scenario: Maintaining system integrity during intermittent RF transmission causing supply droop. IC Role / Device Role / Timing Role: Detects sub-4.38V dips on 3.3V/4.2V hybrid supply and holds µP in reset until stable. Use Value: Prevents data corruption in memory-mapped I/O during burst-mode RF operation. |
Use Scenario: Coordinating reset across multiple voltage domains (core, I/O, display) during power-up. IC Role / Device Role / Timing Role: Acts as primary supervisor for main 4.38V system rail; RESET output tied to µP and peripheral reset chains via shared pullup. Use Value: Enables single-point reset control with open-drain flexibility for mixed-voltage domain interfacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6402BS44 | Same 4.38V threshold and UCSP-4 package, but belongs to 2.20–3.08V family - not offered with 4.38V option; MAX6405BS44 is correct part for this threshold | Not applicable - MAX6402BS44 does not exist at 4.38V; MAX6405BS44 is the only valid 4.38V open-drain variant | Select MAX6405BS44 for 4.38V open-drain supervision; MAX6402 series covers lower thresholds only |
| TPS3808G33DBVR | 3.3V threshold, SOT-23-6, 1.6µA supply current, push-pull output - differs in voltage, package, current, and output type | Used in 3.3V systems with higher current budget and no need for open-drain bus sharing | Choose MAX6405BS44 for 4.38V, ultra-low-current, open-drain requirements in space-constrained designs |
Compared with TPS3808G33DBVR, MAX6405BS44 offers 4.38V threshold, 500nA supply current (30× lower), and open-drain output - making it suitable for 4.2V Li-ion systems needing minimal quiescent power and bidirectional reset pin support, whereas TPS3808 targets general-purpose 3.3V applications with higher drive capability.
Availability
MAX6405BS44 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, cell phones, MP3 players, pagers, and PDAs requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6405BS44 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, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX6400–MAX6405 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable electronics, emphasizing minimal supply current, small footprint, and robust brownout response.
FAQ
What is the exact reset threshold voltage of the MAX6405BS44?
The MAX6405BS44 has a factory-trimmed nominal reset threshold of 4.38V, 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 under suffix "44*", and applies specifically to the MAX6405BS44 - not to other variants in the MAX6400–MAX6405 family.
Does the MAX6405BS44 require an external pullup resistor on the RESET pin?
Yes, the MAX6405BS44 features an open-drain RESET output and requires an external pullup resistor to the appropriate logic rail (e.g., 3.3V or 4.38V). Typical values range from 10kΩ to 100kΩ. This design enables wired-OR configurations and direct interfacing with microcontrollers that have bidirectional reset pins, as explicitly described in the Applications Information section.
What is the minimum supply voltage at which the MAX6405BS44 guarantees correct reset output state?
The MAX6405BS44 guarantees correct reset output logic state down to VCC = 1.0V, as stated in the General Description and Electrical Characteristics tables. This ensures deterministic reset assertion even during deep brownout or near-end-of-life battery conditions, a key reliability feature for portable equipment.
Can the MAX6405BS44 be used in place of the MAX6402BS44?
No - MAX6402BS44 does not exist. The MAX6402 series is limited to 2.20V–3.08V thresholds (per Selector Guide), while MAX6405BS44 is the only part in the family offered with the 4.38V threshold and open-drain output. Using any MAX6402 variant would result in incorrect trip voltage; MAX6405BS44 is the designated part for this specification.
What package type and dimensions does the MAX6405BS44 use?
The MAX6405BS44 uses a 4-bump UCSP (Ultra Compact Silicon Package) with 2mm × 2mm footprint and 0.5mm bump pitch. It is a lead-free, chip-scale package supplied in tape-and-reel format only, qualified per Maxim's UCSP reliability standards and compatible with standard SMT reflow profiles peaking at 235°C.
MAX6405BS44 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 FAQ
1.How can I place an order for MAX6405BS44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6405BS44 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 reliable?
The price and inventory of MAX6405BS44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6405BS44 is usually 5 days.
3.What payment methods are accepted for MAX6405BS44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6405BS44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6405BS44?
MAX6405BS44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6405BS44 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?
For technical support, including MAX6405BS44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6405BS44 requirements.
6.How does Aetrix verify that MAX6405BS44 is sourced from the original manufacturer or authorized distributors?
All MAX6405BS44 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 meets industry standards.
7.What is the process for return or replacement of MAX6405BS44?
All MAX6405BS44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6405BS44, 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 part is unused and in its original packaging.
Return procedure for MAX6405BS44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6405BS44 Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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V6340RSP3B+
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EM6325CXSP5B-2.9+
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MCP120T-300I/TT
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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