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Analog Devices Inc./Maxim Integrated MAX6804US46D3+T
- Part No.:
- MAX6804US46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US46D3+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
MAX6804US46D3+T from Maxim Integrated is a 4-pin SOT143 push/pull active-low microprocessor supervisory circuit designed for precise power supply monitoring in embedded systems. It asserts reset when VCC drops below 4.63V (±3% over temperature), guarantees valid RESET output down to VCC = 0.7V, and provides a 100ms minimum reset timeout period. Used in critical µP power monitoring for industrial controllers and portable equipment.
For engineers reviewing the MAX6804US46D3+T datasheet, MAX6804US46D3+T pinout, MAX6804US46D3+T application, or MAX6804US46D3+T equivalent, key selection criteria include factory-trimmed 4.63V threshold accuracy, 100ms timeout stability over -40°C to +125°C, ultra-low 4µA supply current at 3V, and guaranteed push/pull RESET validity during brownout recovery.
Technical Context
The MAX6804US46D3+T implements a precision bandgap-based reset comparator with ±3% threshold tolerance over full temperature range and 30µs propagation delay on VCC fall. Its internal 20kΩ MR pullup eliminates external components, and reset assertion remains active for ≥100ms after VCC rises above 4.63V or MR deassertion.
This device operates from 0.7V to 5.5V supply, maintains push/pull RESET logic state integrity down to VCC = 0.7V, and rejects transients ≤50ns on MR and ≤30µs on VCC (at 100mV overdrive). It requires no external capacitors or resistors for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±3% over -40°C to +125°C - ensures reliable brownout detection for 5V systems with margin |
| Reset Timeout Period | 100ms minimum - meets JEDEC JESD78 requirement for processor initialization hold time |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | 0.7V to 5.5V - supports valid reset assertion during deep brownout and post-power-up ramp |
| MR Input Glitch Immunity | 50ns - prevents false resets from ESD or noise coupling on manual-reset line |
| RESET Output Low Voltage | 0.4V max at ISINK = 50µA, VCC ≥ 1.0V - ensures TTL/CMOS-compatible low-state drive into µP reset pin |
| VCC Propagation Delay | 30µs at 10V/ms slew rate - fast response to rapid supply collapse without overshoot |
Pinout & Package
MAX6804US46D3+T is housed in a RoHS-compliant 4-pin SOT143 package (outline 21-0052), footprint-compatible with industry-standard 4-pin supervisory IC layouts. The compact 1.3mm × 2.1mm body height supports space-constrained PCB designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 2 - RESET | Active-low push/pull reset output | Drives µP reset pin low during fault; actively pulls high when deasserted - no external pullup required |
| 3 - MR | Manual-reset input | Logic-low assertion triggers reset; internal 20kΩ pullup allows direct switch-to-GND connection without external components |
| 4 - VCC | Supply voltage input | Monitored power rail; device functions correctly down to 0.7V, enabling reset assertion during deep undervoltage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V threshold | Eliminates need for external resistor divider; reduces BOM count and calibration labor in production |
| 100ms minimum reset timeout | Ensures sufficient hold time for slow-ramping 5V supplies and complex µP boot sequences |
| 4µA supply current at 3V | Enables integration into always-on battery-backed subsystems without measurable drain impact |
| Debounced MR input with 20kΩ pullup | Supports direct SPST switch interface; removes need for RC filters or Schmitt-trigger buffers |
| VCC transient immunity | Rejects <30µs negative glitches at 100mV overdrive - prevents spurious resets in noisy power environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power sequencing and brownout protection in DIN-rail mounted programmable logic controllers operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 µP during 24V DC supply sag or EMI-induced ripple. Use Value: Guarantees 100ms reset pulse width even at -40°C, preventing corrupted firmware execution during cold-start voltage ramp. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring fail-safe restart after Li-ion cell voltage drop below 3.2V. IC Role / Device Role / Timing Role: Monitoring main 3.3V LDO output and asserting RESET before µC enters undefined state during discharge. Use Value: 4µA quiescent current extends single-charge runtime by >12 months; 4.63V threshold aligns with battery protection cutoff. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Reset supervision for CAN-enabled microcontrollers in 12V automotive subsystems exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Detecting VCC collapse during cranking (down to 6V) and holding RESET asserted until stable 5V rail reestablished. Use Value: Valid operation down to 0.7V ensures reset assertion continuity through worst-case cold-crank transients. |
Use Scenario: Tamper-resistant metering ICs requiring deterministic reset behavior during AC mains interruption or capacitor backup discharge. IC Role / Device Role / Timing Role: Monitoring 3.3V backup rail derived from supercapacitor; asserting RESET before voltage falls below µC operational minimum. Use Value: Factory-trimmed 4.63V threshold provides precise margin above 3.3V rail while rejecting normal ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US46D3+T | Same 4.63V threshold and 100ms timeout, but uses BiCMOS process with 1.5µA lower ICC at 3V | Identical pinout and function; optimized for ultra-low-power battery applications where every nanoamp matters | Select MAX6315US46D3+T only if sub-3µA supply current is mandatory; otherwise MAX6804US46D3+T offers broader temp validation |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable), 200ms timeout, 1.1µA ICC, SOT-23-5 package | Requires PCB redesign due to 5-pin layout and lacks MR input; suited for cost-sensitive, fixed-threshold designs | Choose TPS3808G33DBVR only for new designs targeting 3.3V rails with no manual reset need; not drop-in compatible |
Compared with MAX6315US46D3+T, MAX6804US46D3+T trades 1.5µA lower ICC for superior -40°C to +125°C characterization confidence; versus TPS3808G33DBVR, it provides field-configurable threshold and MR support at the cost of higher quiescent current and legacy SOT143 footprint.
Availability
MAX6804US46D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6804US46D3+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 industrial, automotive, and computing applications, with emphasis on reliability and integration.
The MAX680x family delivers highly accurate, low-power µP supervisory circuits for mission-critical power monitoring - engineered specifically for systems demanding guaranteed reset behavior during brownout, cold-crank, and battery-depletion scenarios.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6804US46D3+T?
The MAX6804US46D3+T has a factory-trimmed reset threshold of 4.63V, specified with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and corresponds to the "46" suffix in the part number. The threshold is laser-trimmed during production to ensure accuracy without external calibration.
Does MAX6804US46D3+T require an external pullup resistor on the RESET pin?
No, MAX6804US46D3+T does not require an external pullup resistor on the RESET pin because it features a push/pull output stage. The internal driver actively pulls RESET high when deasserted, ensuring clean CMOS/TTL-compatible logic levels without external components. This simplifies layout and improves noise immunity compared to open-drain alternatives like the MAX6805 series.
What is the minimum supply voltage at which MAX6804US46D3+T guarantees valid RESET output?
MAX6804US46D3+T guarantees valid RESET output down to VCC = 0.7V across the full -40°C to +125°C temperature range. This ensures reliable reset assertion during deep brownout events, such as automotive cold-crank or battery depletion, where supply voltage may collapse well below nominal levels before recovery.
How long is the reset timeout period for MAX6804US46D3+T, and is it adjustable?
The MAX6804US46D3+T has a fixed 100ms minimum reset timeout period, indicated by the "D3" suffix in the part number. This timeout is factory-programmed and non-adjustable; it begins after VCC rises above 4.63V or after MR is deasserted, and ensures sufficient hold time for complex microprocessor initialization sequences per JEDEC JESD78 standards.
Can MAX6804US46D3+T interface directly with a microcontroller that has a bidirectional reset pin?
MAX6804US46D3+T is not recommended for direct interface with bidirectional reset pins (e.g., Motorola 68HC11) because its push/pull output cannot tolerate external voltage sources on RESET. For such applications, the open-drain MAX6805US46D3+T is preferred - it allows safe wired-OR configuration with µP-driven reset signals using a single external pullup resistor.
MAX6804US46D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6804US46D3+T FAQ
1.How can I place an order for MAX6804US46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US46D3+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 MAX6804US46D3+T reliable?
The price and inventory of MAX6804US46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US46D3+T is usually 5 days.
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4.How is shipping managed for MAX6804US46D3+T?
MAX6804US46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US46D3+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 MAX6804US46D3+T?
For technical support, including MAX6804US46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US46D3+T requirements.
6.How does Aetrix verify that MAX6804US46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6804US46D3+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 MAX6804US46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6804US46D3+T?
All MAX6804US46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US46D3+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 MAX6804US46D3+T part is unused and in its original packaging.
Return procedure for MAX6804US46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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