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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:2,044
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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 embedded systems. It asserts reset when VCC drops below 4.38V (±3% over temperature), maintains reset for ≥100ms after recovery, and operates down to 0.7V supply - enabling reliable brownout detection in battery-powered controllers and industrial µP systems.
For engineers reviewing the MAX6804US44D3+T datasheet, MAX6804US44D3+T pinout, MAX6804US44D3+T application, or MAX6804US44D3+T equivalent, key selection criteria include its factory-trimmed 4.38V threshold, guaranteed 100ms minimum reset timeout, ultra-low 4µA supply current at 3V, and compatibility with space-constrained designs requiring robust manual-reset debouncing without external components.
Technical Context
The MAX6804US44D3+T implements a precision bandgap-based reset comparator with ±3% threshold tolerance over –40°C to +125°C and immunity to VCC transients ≤30µs at 10V/ms. Its internal 20kΩ MR pullup eliminates external biasing, and reset assertion is synchronized to VCC crossing the 4.38V threshold with no hysteresis.
This device uses BiCMOS process technology (505 transistors) to achieve stable push/pull RESET output drive: VOL ≤0.4V at ISINK = 50µA (VCC ≥1.0V), VOH ≥0.8×VCC at ISOURCE = 500µA (VCC ≥3.0V), ensuring clean logic-level signaling into high-impedance µP reset inputs across full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% over –40°C to +125°C - ensures deterministic brownout response at nominal 4.38V supply level |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for µP initialization and peripheral stabilization |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year operation in coin-cell–powered instrumentation |
| Operating Voltage Range | 0.7V to 5.5V - supports valid reset assertion during deep brownout and hot-swap scenarios |
| MR Input Logic | Active-low with 20kΩ internal pullup - allows direct switch-to-GND connection without external R/C debounce |
| RESET Output Type | Push/pull active-low - drives low without external pullup, compatible with standard µP reset input requirements |
| VCC Transient Immunity | Rejects negative glitches ≤30µs at 10V/ms - prevents false resets from switching noise or ESD coupling |
Pinout & Package
MAX6804US44D3+T is housed in a 4-pin SOT143 package (outline 21-0052, land pattern 90-0183), measuring 2.9mm × 1.6mm × 1.1mm, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage; must be low-impedance connection |
| 2 | RESET | Active-low push/pull output; sinks current when asserted, sources current when deasserted - directly interfaces µP reset pin |
| 3 | MR | Manual-reset input; logic-low assertion forces reset regardless of VCC state - internally pulled up to VCC |
| 4 | VCC | Primary power supply input; monitored for threshold violation and used as reference for RESET output levels |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.38V reset threshold | Eliminates external resistor network and calibration - reduces BOM count and layout area by 100% |
| 100ms minimum reset timeout | Guarantees µP core and peripherals fully initialize before release - avoids race conditions in boot sequence |
| Ultra-low 4µA supply current | Extends battery life in portable instruments and remote sensors - enables >10-year operation on CR2032 |
| Debounced MR input with 20kΩ pullup | Supports direct momentary switch connection - removes need for RC filter or Schmitt trigger |
| Valid RESET output down to VCC = 0.7V | Maintains defined logic state during deep brownout - prevents µP latch-up or undefined reset behavior |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous operation in factory-floor automation where 24V DC supplies experience ripple and transient dips. IC Role / Device Role / Timing Role: Monitors 3.3V auxiliary rail derived from 24V supply; asserts reset if voltage sags below 4.38V due to load switching or EMI. Use Value: Prevents firmware corruption during brownout by holding µP in reset until stable 3.3V is restored for ≥100ms. |
Use Scenario: Long-term environmental monitoring using AA/AAA batteries with gradual discharge profile. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output feeding MSP430 µP; triggers reset at 4.38V threshold to halt operation before brownout-induced data loss. Use Value: Enables graceful shutdown and nonvolatile memory write completion before VCC falls below µP operational minimum. |
| Medical Diagnostic Handhelds | Smart Energy Meters |
Use Scenario: Portable ultrasound or glucose meter requiring FDA-compliant power integrity during battery swap or low-battery warning. IC Role / Device Role / Timing Role: Resets ARM Cortex-M0+ processor upon 4.38V supply drop, synchronizing with battery fuel-gauge interrupt. Use Value: Ensures deterministic restart after hot-swap - eliminates risk of corrupted EEPROM calibration tables. |
Use Scenario: ANSI C12.20–compliant electricity meter exposed to grid surges and neutral-loss events. IC Role / Device Role / Timing Role: Guards 3.3V real-time clock and metrology ASIC supply; asserts reset within 30µs of 4.38V breach. Use Value: Maintains accurate timekeeping and billing integrity by preventing partial register writes during voltage collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811LCS29D3+T | Same 4-pin SOT143 package, 2.93V reset threshold, 100ms timeout, but higher 12µA supply current at 5V | Lower threshold suits 3.3V systems; less suitable for 4.5V–5V rails where 4.38V margin is critical | Select when system VCC nominal is 3.3V and tighter 2.93V trip point improves noise margin |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.1µA quiescent current, SOT-23-5 package with enable pin | Requires external enable control; lacks manual reset input - unsuitable for field-serviceable devices | Choose for ultra-low-power 3.3V systems where manual reset is unnecessary and longer timeout is acceptable |
Compared with MAX811LCS29D3+T and TPS3808G33DBVR, the MAX6804US44D3+T uniquely delivers 4.38V precision threshold, integrated MR debouncing, and sub-5µA operation in a 4-pin footprint - making it optimal for 4.5V–5V industrial controllers requiring deterministic brownout response without layout overhead.
Availability
MAX6804US44D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical handheld diagnostics, smart energy meters, and critical µP power monitoring 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 reliability, low power, and integration.
The MAX6803/MAX6804/MAX6805 family targets space-constrained µP supervisory needs - delivering factory-trimmed thresholds, guaranteed low-voltage operation, and manual-reset capability in minimal 4-pin SOT143 packaging.
FAQ
What is the exact reset threshold voltage of MAX6804US44D3+T and how tightly is it specified?
The MAX6804US44D3+T has a factory-trimmed 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 specification is guaranteed per datasheet Electrical Characteristics table and applies directly to the MAX6804US44D3+T - not inferred from family data.
Does MAX6804US44D3+T require external components to operate correctly?
No, the MAX6804US44D3+T requires no external components for basic operation: its MR input includes a 20kΩ internal pullup, the reset threshold is factory-programmed, and the 100ms timeout is built-in. Only decoupling capacitance (recommended 0.1µF ceramic near VCC/GND) is advised for noise immunity - no resistors, capacitors, or trim pots are needed.
How does MAX6804US44D3+T behave when VCC drops below 1.0V?
The MAX6804US44D3+T remains functional and asserts valid RESET down to VCC = 0.7V, as guaranteed in the datasheet. Below 0.7V, operation is not specified. For applications requiring RESET validity down to 0V, a 100kΩ pulldown resistor from RESET to GND is recommended - this holds the output low despite reduced sink capability near minimum supply.
Is MAX6804US44D3+T pin-compatible with other supervisory ICs?
Yes, the MAX6804US44D3+T is pin-compatible with MAX811/MAX812 and MAX6314/MAX6315 families in the 4-pin SOT143 package. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC - identical mapping enables drop-in replacement where 4.38V threshold and 100ms timeout meet system requirements.
What is the maximum VCC transient duration that MAX6804US44D3+T can ignore without asserting reset?
At a VCC overdrive of 100mV (i.e., VCC falling 100mV below 4.38V), the MAX6804US44D3+T ignores transients ≤30µs in duration, as shown in Figure 5 of the datasheet. This immunity increases for smaller overdrive amplitudes - e.g., 50mV overdrive allows ≤60µs transients - preventing false resets from switching noise or ESD.
MAX6804US44D3+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:
- 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 Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
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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