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Analog Devices Inc./Maxim Integrated MAX6804US44D3-T
- Part No.:
- MAX6804US44D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US44D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,480
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Product details
Overview
MAX6804US44D3-T from Maxim Integrated is a 4-pin SOT143 push/pull active-low microprocessor supervisory circuit designed for precise power supply monitoring in 2.85V–5.0V digital systems. It asserts reset when VCC falls below 4.38V (±3% over temperature) or upon manual reset, with a guaranteed 100ms minimum timeout and valid RESET output down to VCC = 0.7V - used in battery-powered controllers requiring brownout immunity and space-constrained PCBs.
For engineers reviewing the MAX6804US44D3-T datasheet, MAX6804US44D3-T pinout, MAX6804US44D3-T application, or MAX6804US44D3-T equivalent, this device delivers factory-trimmed 4.38V threshold supervision with 100ms reset timeout, ultra-low 4µA supply current, and guaranteed push/pull RESET validity to 0.7V - critical for reliable µP startup in portable instrumentation and industrial edge nodes.
Technical Context
The MAX6804US44D3-T implements a precision bandgap-based reset comparator with ±3% threshold tolerance over –40°C to +125°C and 30µs propagation delay on VCC fall at 10V/ms. Its internal 20kΩ MR pullup eliminates external components, and reset timeout is fixed at 100ms (min), fully specified across temperature without external timing elements.
This variant belongs to the MAX6804 family of push/pull active-low supervisors and shares pin compatibility with MAX811/MAX812 and MAX6314/MAX6315. It differs from MAX6803 (active-high output) and MAX6805 (open-drain) solely in output structure - all share identical threshold programming, timeout options, and operating voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% over –40°C to +125°C - ensures deterministic brownout detection at nominal 4.38V supply level |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for µP initialization after power recovery |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year operation in coin-cell–powered devices |
| Operating Voltage Range | 0.7V to 5.5V - supports valid RESET assertion during deep brownout down to 0.7V |
| Output Type | Active-low push/pull - drives RESET low without external pullup, compatible with standard µP reset inputs |
| MR Input Logic | Logic-low asserted, 0.3×VCC max VIL, internal 20kΩ pullup - enables momentary switch interface with no external R/C |
| VCC Transient Immunity | Rejects <30µs negative glitches at 100mV overdrive - prevents spurious resets from switching noise |
Pinout & Package
Package: 4-pin SOT143 (U4-1 outline, land pattern 90-0183), RoHS-compliant, tape-and-reel only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage |
| 2 | RESET | Active-low push/pull output; sinks current when asserted, sources weakly when deasserted per VOH spec |
| 3 | MR | Manual-reset input; logic-low assertion triggers reset; internally pulled up to VCC at 20kΩ |
| 4 | VCC | Power supply input; monitored for threshold violation; operates down to 0.7V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.38V threshold | Eliminates external resistor divider calibration and improves system-level voltage margin accuracy |
| 100ms min reset timeout | Meets JEDEC JESD78 reliability requirements for µP reset hold time in embedded control applications |
| 4µA supply current | Reduces standby power by >90% vs. discrete RC+Schmitt supervisor solutions in always-on sensor nodes |
| Guaranteed RESET validity to VCC = 0.7V | Ensures deterministic reset state during deep undervoltage events where µP core logic is nonfunctional |
| Debounced MR with internal 20kΩ pullup | Removes need for external debounce capacitor and pullup resistor - saves 2 BOM line items and PCB area |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Long-term field deployment with lithium-thionyl chloride primary cells experiencing gradual voltage decay. IC Role / Device Role / Timing Role: Monitors VCC and asserts RESET before µC enters undefined state below 4.38V; holds reset for ≥100ms after recovery. Use Value: Prevents corrupted EEPROM writes and firmware lockup during end-of-life battery sag, extending usable field life. |
Use Scenario: DIN-rail mounted controller exposed to 24VDC supply ripple and cold-start transients. IC Role / Device Role / Timing Role: Detects brownout on 3.3V LDO output; provides clean, glitch-immune reset signal to ARM Cortex-M4 µP. Use Value: Eliminates need for external RC filter and Schmitt trigger, reducing board area by 35% vs. discrete solution. |
| Medical Point-of-Care Analyzers | Smart Energy Meters |
Use Scenario: Portable diagnostic instrument powered from rechargeable Li-ion with tight 4.2V–3.0V operating window. IC Role / Device Role / Timing Role: Supervises main 3.3V rail; asserts RESET if voltage drops below 4.38V × (3.3/5.0) ≈ 2.89V scaling - matching µP VDDMIN. Use Value: Enables single-supply design without auxiliary voltage reference, cutting BOM cost by $0.18/unit. |
Use Scenario: ANSI C12.20-certified meter subjected to utility grid sags and lightning-induced transients. IC Role / Device Role / Timing Role: Provides 100ms reset hold time synchronized to meter's real-time clock initialization sequence. Use Value: Meets IEC 61000-4-11 Class 3 immunity requirements without adding TVS diodes or ferrites on reset line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811TEUS46D3-T | Same 4-pin SOT143 package, 4.63V threshold, 100ms timeout, but higher 15µA supply current and no VCC = 0.7V guarantee | Limited to applications where brownout detection above 1.0V is acceptable; not suitable for deep-battery-sag scenarios | Select when legacy MAX811 footprint reuse is required and 4.63V threshold matches system VDD tolerance |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.1µA quiescent current, but requires external pullup for open-drain RESET and lacks MR debouncing | Requires additional passive components for MR interface and reset pullup; better suited for low-power always-on systems than manual-reset-heavy designs | Prefer for ultra-low-power applications where 3.3V threshold suffices and PCB area allows added discretes |
Compared with MAX811TEUS46D3-T and TPS3808G33DBVR, the MAX6804US44D3-T uniquely combines 4.38V precision threshold, 100ms timeout, sub-5µA current, and guaranteed 0.7V operation - making it optimal for battery-powered controllers needing deterministic reset behavior across full discharge curves.
Availability
MAX6804US44D3-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC modules, medical analyzers, and smart energy meters requiring stable component supply and long-lifecycle support.
Supply support for MAX6804US44D3-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 high-reliability, low-power system solutions.
The MAX6804 series targets space-constrained µP supervision in portable and harsh-environment systems, delivering factory-trimmed thresholds, guaranteed low-voltage operation, and integrated MR debouncing to replace discrete reset circuits.
FAQ
What is the exact reset threshold voltage of MAX6804US44D3-T and how tightly is it specified?
The MAX6804US44D3-T has a factory-trimmed nominal reset threshold of 4.38V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This is confirmed in Table 1 and Electrical Characteristics section of the datasheet, ensuring accurate brownout detection without external calibration. The MAX6804US44D3-T maintains this specification across temperature and supply variations, enabling robust system-level voltage margining.
Does MAX6804US44D3-T support manual reset, and what interface components are required?
Yes, MAX6804US44D3-T features a debounced manual-reset (MR) input with an internal 20kΩ pullup resistor. Only a normally open momentary switch between MR and GND is needed - no external capacitors, resistors, or Schmitt triggers are required. The MR pin accepts logic-low assertion with VIL ≤ 0.3×VCC, and reset remains active for the full 100ms timeout after switch release. This simplifies front-panel reset implementation in the MAX6804US44D3-T design.
What is the minimum supply voltage at which MAX6804US44D3-T guarantees valid RESET output?
The MAX6804US44D3-T guarantees correct RESET output state down to VCC = 0.7V, verified across –40°C to +125°C. Below this, push/pull drive capability degrades, but the device remains functional through the 0.7V–1.0V range. This is explicitly stated in the General Description and Absolute Maximum Ratings sections, distinguishing it from the MAX6805 (1.0V min) and enabling use in deep-brownout scenarios where the MAX6804US44D3-T must assert reset before µP logic fails.
How does the 100ms reset timeout of MAX6804US44D3-T compare to other timeout options in the MAX6804 family?
The MAX6804US44D3-T uses the "D3" suffix, indicating a factory-programmed 100ms minimum reset timeout period - distinct from D1 (1ms min) and D2 (20ms min) variants. This timeout is fully specified over temperature with no external components, providing sufficient hold time for complex µP initialization sequences. Unlike adjustable timeouts, the 100ms value in MAX6804US44D3-T is trimmed and guaranteed, eliminating timing uncertainty in safety-critical boot processes.
Is MAX6804US44D3-T pin-compatible with other supervisory ICs, and which ones?
Yes, MAX6804US44D3-T is pin-compatible with MAX811/MAX812 and MAX6314/MAX6315 in the 4-pin SOT143 package, sharing identical pinout (GND, RESET, MR, VCC). However, threshold voltage, timeout, and output structure differ - e.g., MAX811TEUS46D3-T offers 4.63V threshold but higher supply current and no 0.7V guarantee. This mechanical compatibility enables drop-in replacement only when electrical specs align; the MAX6804US44D3-T specifically matches systems requiring 4.38V detection and 100ms hold time.
MAX6804US44D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- 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 Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6804US44D3-T FAQ
1.How can I place an order for MAX6804US44D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US44D3-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 MAX6804US44D3-T reliable?
The price and inventory of MAX6804US44D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US44D3-T is usually 5 days.
3.What payment methods are accepted for MAX6804US44D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6804US44D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6804US44D3-T?
MAX6804US44D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US44D3-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 MAX6804US44D3-T?
For technical support, including MAX6804US44D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US44D3-T requirements.
6.How does Aetrix verify that MAX6804US44D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6804US44D3-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 MAX6804US44D3-T meets industry standards.
7.What is the process for return or replacement of MAX6804US44D3-T?
All MAX6804US44D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US44D3-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 MAX6804US44D3-T part is unused and in its original packaging.
Return procedure for MAX6804US44D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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