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Analog Devices Inc./Maxim Integrated MAX6803US44D3+
- Part No.:
- MAX6803US44D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6803US44D3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
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Product details
Overview
MAX6803US44D3+ from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit in 4-pin SOT143 package, monitoring VCC from 2.85V to 5.0V with factory-trimmed 4.38V reset threshold (±3% over -40°C to +125°C), 100ms minimum reset timeout, and guaranteed operation down to 0.7V supply voltage. It provides reliable power-on/brownout reset for embedded controllers and portable equipment.
For engineers reviewing the MAX6803US44D3+ datasheet, MAX6803US44D3+ pinout, MAX6803US44D3+ application, or MAX6803US44D3+ equivalent, key selection criteria include its active-high RESET output, ultra-low 4µA supply current at 3.0V, debounced manual-reset input with internal 20kΩ pullup, and immunity to fast VCC transients up to 30µs at 10V/ms slew rate.
Technical Context
The MAX6803US44D3+ implements a precision bandgap-based reset comparator with factory-trimmed 4.38V threshold and ±3% tolerance over full temperature range. Its push/pull output drives high during reset assertion (VOH ≥ 0.8×VCC at 1µA) and low otherwise (VOL ≤ 0.4V at 3.2mA), ensuring deterministic logic levels for µP reset inputs.
Reset timeout is fixed at ≥100ms after VCC rises above threshold or MR deassertion, with propagation delay under 30µs for VCC falling at 10V/ms. The device maintains valid RESET output down to VCC = 0.7V and includes MR glitch immunity of 50ns and minimum pulse width of 1µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% over -40°C to +125°C - ensures reliable brownout detection for 4.5V nominal supplies |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for processor initialization sequences |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year battery life in portable applications |
| Operating Voltage Range | 0.7V to 5.5V - supports operation during deep brownout and full-system power-up |
| MR Input Logic | Active-low with 20kΩ internal pullup - eliminates external components for manual reset |
| RESET Output Type | Push/pull active-high - directly interfaces with µP reset pins requiring high-asserted reset |
| VCC Transient Immunity | Rejects <30µs negative glitches at 10V/ms - prevents false resets from switching noise |
Pinout & Package
MAX6803US44D3+ uses a 4-pin SOT143 package (U4-1 outline, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator |
| 2 | RESET | Active-high push/pull output asserted high during reset; sinks current when inactive |
| 3 | MR | Manual-reset input; logic low asserts reset; internally pulled up to VCC at 20kΩ |
| 4 | VCC | Power supply input; monitored for reset generation and powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.38V threshold | Eliminates external resistor networks and calibration for precise 4.5V system monitoring |
| 100ms minimum reset timeout | Meets JEDEC JESD78 requirements for microcontroller initialization hold time |
| 0.7V minimum operating voltage | Ensures reset remains valid through deep brownout conditions before system shutdown |
| Debounced MR input | Accepts mechanical switch inputs without external RC filtering or firmware debounce |
| 4µA supply current at 3.0V | Reduces quiescent power in always-on monitoring circuits by >90% vs. discrete solutions |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered from 4.5V DC-DC converters subject to line transients and thermal cycling. IC Role / Device Role / Timing Role: Monitors VCC and asserts active-high RESET to ARM Cortex-M4 core during brownout events. Use Value: Prevents corrupted register writes during undervoltage by holding processor in reset until stable 4.38V threshold is exceeded for ≥100ms. |
Use Scenario: Battery-powered glucose meter with Li-ion cell discharging from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output and triggers controlled shutdown via active-high RESET. Use Value: Guarantees clean processor reset at 4.38V threshold before battery reaches critical low-voltage cutoff. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: 12V automotive system with 5V rail derived from buck converter exposed to load-dump transients. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision for CAN-enabled microcontroller during cold-crank events. Use Value: Maintains valid RESET output down to 0.7V supply, enabling deterministic recovery after severe brownout. |
Use Scenario: DIN-rail mounted electricity meter with isolated 3.3V auxiliary supply. IC Role / Device Role / Timing Role: Detects AC mains failure and initiates secure data save sequence via active-high RESET signal. Use Value: 100ms timeout ensures EEPROM write completion before power loss, preventing data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811SEUS46D3+ | Same 4.63V threshold and 100ms timeout but lower 2.5µA ICC; push/pull active-low output | Requires µP with active-low reset input; not compatible with active-high reset architectures | Select only if target µP accepts active-low reset and lower supply current is prioritized |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.8µA ICC; active-low open-drain output | Lacks manual reset input; requires external pullup; incompatible with 4.38V monitoring requirement | Use only for 3.3V systems where manual reset is unnecessary and longer timeout is acceptable |
Compared with MAX811SEUS46D3+ and TPS3808G33DBVR, the MAX6803US44D3+ uniquely satisfies applications requiring 4.38V threshold, active-high reset, manual reset capability, and guaranteed 0.7V operation-making it irreplaceable in 4.5V industrial controllers and portable medical devices.
Availability
MAX6803US44D3+ is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6803US44D3+ 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 expertise in power management and supervisory circuits.
The MAX6803 family delivers ultra-low-power, factory-trimmed reset supervision for space-constrained µP systems requiring high reliability and minimal external components.
FAQ
What is the exact reset threshold voltage for MAX6803US44D3+ and how tightly is it specified?
The MAX6803US44D3+ has a factory-trimmed reset threshold of 4.38V at +25°C, with guaranteed tolerance of ±3% over the full operating temperature range (-40°C to +125°C). This means the actual threshold falls between 4.249V and 4.511V across temperature, ensuring robust detection of brownout on 4.5V nominal rails without false triggering.
Does MAX6803US44D3+ support manual reset, and what are the electrical requirements for the MR pin?
Yes, MAX6803US44D3+ includes a debounced manual-reset input (MR) that asserts reset when pulled low. The MR pin features an internal 20kΩ pullup resistor to VCC, so it can be left unconnected when unused. To activate manual reset, connect a normally open momentary switch from MR to GND; no external components are required due to built-in debouncing.
What is the minimum supply voltage at which MAX6803US44D3+ guarantees correct reset output behavior?
The MAX6803US44D3+ guarantees correct RESET/RESET output state down to VCC = 0.7V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows the device to maintain valid active-high reset assertion even during deep brownout conditions before system power collapse.
How does the 100ms reset timeout period of MAX6803US44D3+ impact microcontroller startup timing?
The MAX6803US44D3+ provides a minimum 100ms reset timeout period after VCC rises above 4.38V or after MR is released. This ensures the microcontroller remains held in reset long enough to complete internal oscillator stabilization, PLL lock, and memory initialization-meeting or exceeding JEDEC JESD78 requirements for reliable power-on sequencing.
Is MAX6803US44D3+ pin-compatible with other members of the MAX6803/MAX6804/MAX6805 family?
Yes, MAX6803US44D3+ shares identical 4-pin SOT143 pinout and footprint with all MAX6803, MAX6804, and MAX6805 variants. Pin 1 is GND, Pin 2 is RESET (active-high push/pull), Pin 3 is MR, and Pin 4 is VCC. This allows direct substitution within the same family when changing reset threshold or output type, provided system-level logic polarity is verified.
MAX6803US44D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6803US44D3+ FAQ
1.How can I place an order for MAX6803US44D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6803US44D3+ 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 MAX6803US44D3+ reliable?
The price and inventory of MAX6803US44D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6803US44D3+ is usually 5 days.
3.What payment methods are accepted for MAX6803US44D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6803US44D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6803US44D3+?
MAX6803US44D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6803US44D3+ 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 MAX6803US44D3+?
For technical support, including MAX6803US44D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6803US44D3+ requirements.
6.How does Aetrix verify that MAX6803US44D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6803US44D3+ 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 MAX6803US44D3+ meets industry standards.
7.What is the process for return or replacement of MAX6803US44D3+?
All MAX6803US44D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6803US44D3+, 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 MAX6803US44D3+ part is unused and in its original packaging.
Return procedure for MAX6803US44D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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