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Analog Devices Inc./Maxim Integrated MAX6803US26D3
- Part No.:
- MAX6803US26D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6803US26D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,756
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Product details
Overview
MAX6803US26D3 from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit in SOT143 package, monitoring VCC from 2.85V to 5.0V with factory-trimmed 2.63V reset threshold and 100ms minimum reset timeout. It asserts RESET high during power-up, brownout, or manual reset, and guarantees valid output down to VCC = 0.7V. Used in portable equipment and critical µP power monitoring where deterministic reset behavior is required.
For engineers reviewing the MAX6803US26D3 datasheet, MAX6803US26D3 pinout, MAX6803US26D3 application, or MAX6803US26D3 equivalent, key selection considerations include its active-high push/pull output, 2.63V threshold tolerance (±3% over temperature), ultra-low 4µA supply current at 3V, and guaranteed operation down to 0.7V VCC - essential for battery-powered systems with deep brownout recovery requirements.
Technical Context
The MAX6803US26D3 implements a precision bandgap-based voltage comparator with internal hysteresis and a monostable timeout circuit triggered on VCC fall or MR assertion. Its reset logic ensures RESET remains asserted for ≥100ms after VCC rises above 2.63V or MR deasserts, with propagation delay <30µs for 10V/ms VCC transients.
It features a debounced manual-reset input with 20kΩ internal pullup, glitch immunity of 50ns, and MR pulse width requirement of only 1µs. The push/pull output delivers VOH ≥0.8×VCC (ISOURCE = 800µA, VCC ≥4.25V) and VOL ≤0.4V (ISINK = 3.2mA, VCC ≥5.0V), enabling direct interface with CMOS inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±3% over -40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| Reset Timeout Period | 100ms minimum - provides sufficient hold time for µP initialization and peripheral stabilization |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year battery life in always-on monitoring applications |
| Operating VCC Range | 0.7V to 5.5V - supports operation through deep brownout and full system power-up sequence |
| Output Type | Active-high push/pull - eliminates need for external pullup resistor and ensures defined logic level at all times |
| MR Input Logic | Active-low with 20kΩ internal pullup - allows momentary switch-to-GND connection without external components |
| VCC Transient Immunity | Rejects <30µs negative glitches at 10V/ms - prevents false resets during switching noise or ESD events |
Pinout & Package
MAX6803US26D3 is housed in a 4-pin SOT143 package (U4-1 outline, 21-0052 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND | Ground reference | Return path for all internal circuits and reset output sink current |
| 2: RESET | Active-high push/pull reset output | Drives high during fault conditions; sinks current when low; no external pullup needed |
| 3: MR | Manual-reset input | Logic-low assertion triggers reset; internally pulled up to VCC (20kΩ); requires ≥1µs pulse width |
| 4: VCC | Power supply input | Monitored supply rail; device operates down to 0.7V and tolerates up to 6V transient |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.63V threshold | Eliminates external resistor network and calibration effort for precise brownout detection |
| 100ms minimum reset timeout | Ensures µP and peripherals fully initialize before release, avoiding race conditions in boot sequence |
| Ultra-low 4µA supply current | Reduces quiescent power draw in battery-backed systems, extending operational lifetime |
| Guaranteed operation to VCC = 0.7V | Maintains valid RESET output during deep brownout, enabling safe shutdown or state retention |
| Debounced MR input with internal pullup | Supports direct connection of mechanical switch without RC filter or additional ICs |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor operating from single Li-ion cell (2.8–4.2V) with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Monitors VCC during sleep/wake transitions and asserts active-high RESET to prevent corrupted memory writes during brownout. Use Value: 2.63V threshold aligns with Li-ion discharge knee; 100ms timeout ensures ADC and RF subsystems stabilize before firmware execution resumes. |
Use Scenario: DIN-rail mounted I/O module powered by 24VDC supply with local 3.3V LDO for µP and digital isolators. IC Role / Device Role / Timing Role: Supervises 3.3V rail and provides clean power-on reset signal to ARM Cortex-M4 µP and isolated SPI bus controller. Use Value: Push/pull output drives µP RESET pin directly; 0.7V min VCC operation ensures reset validity even during LDO dropout or input ripple. |
| Smart Energy Meters | Ruggedized Handheld Testers |
Use Scenario: ANSI C12.22-compliant electricity meter with backup supercapacitor maintaining RTC and nonvolatile memory during AC loss. IC Role / Device Role / Timing Role: Detects main 3.3V supply collapse and asserts RESET to halt metering firmware while preserving secure data context. Use Value: 4µA ICC minimizes supercapacitor drain; ±3% threshold stability over -40°C to +125°C ensures consistent trip point across environmental extremes. |
Use Scenario: Field-deployed multimeter with dual power sources (AA batteries and USB charging), requiring robust reset under load-switching transients. IC Role / Device Role / Timing Role: Provides glitch-immune reset generation during battery swap or USB connect/disconnect events. Use Value: 50ns MR glitch immunity and 30µs VCC propagation delay prevent spurious resets caused by contact bounce or supply coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811RUS26D3-T | Same 2.63V threshold and 100ms timeout, but active-low open-drain output | Requires external pullup; not compatible with µPs expecting active-high reset assertion | Select only if system design already uses active-low reset architecture and board layout accommodates pullup resistor |
| TPS3808G125DBVR | 2.5V threshold (±0.5%), 200ms timeout, 1.5µA ICC, but requires external capacitor for timeout setting | Lacks factory-programmed timeout; adds BOM item and layout area; higher accuracy but less integration | Prefer when tighter threshold tolerance (±0.5%) is mandatory and design can absorb added passive component and footprint |
Compared with MAX811RUS26D3-T and TPS3808G125DBVR, the MAX6803US26D3 offers integrated active-high push/pull drive, eliminating external components and simplifying µP interface - critical for compact, cost-sensitive designs where reset polarity and layout efficiency are fixed constraints.
Availability
MAX6803US26D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and ruggedized handheld testers requiring stable component supply and guaranteed long-term availability.
Supply support for MAX6803US26D3 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 industrial, automotive, and computing applications, emphasizing high reliability and low-power operation.
The MAX6803 series targets space-constrained, battery-sensitive µP supervisory applications, delivering factory-trimmed thresholds, guaranteed low-voltage operation, and minimal external component count in ultra-small SOT143 packaging.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6803US26D3?
The MAX6803US26D3 has a factory-trimmed nominal reset threshold of 2.63V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating temperature range. This specification is guaranteed per the datasheet's Electrical Characteristics table and applies directly to the MAX6803US26D3 part number, not derived from family-level data.
Does MAX6803US26D3 require an external pullup resistor on its RESET pin?
No, MAX6803US26D3 does not require an external pullup resistor because it features a push/pull output stage. Its RESET pin actively drives high during reset assertion and actively pulls low when deasserted, providing defined logic levels without external components - a key differentiator from open-drain alternatives like the MAX6805 series.
What is the minimum VCC voltage at which MAX6803US26D3 guarantees valid RESET output?
MAX6803US26D3 guarantees correct RESET output state down to VCC = 0.7V over the full -40°C to +125°C temperature range. This is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables, and distinguishes it from the MAX6805 (1.0V min) and supports deep brownout recovery in battery-powered systems.
How is the 100ms reset timeout period implemented in MAX6803US26D3?
The 100ms minimum reset timeout in MAX6803US26D3 is factory-programmed and internally generated - no external capacitor or resistor is needed. The datasheet specifies tRP = 100ms (min), 150ms (typ), 200ms (max) for the "D3" suffix variant, and this timing is monotonic over temperature with <±15% variation across -40°C to +125°C.
Can MAX6803US26D3 be used with microcontrollers that have bidirectional reset pins?
MAX6803US26D3 is not recommended for direct use with bidirectional reset pins (e.g., Motorola 68HC11), because its push/pull output actively drives both high and low states. Bidirectional interfaces require open-drain outputs like those in MAX6805US26D3-T to avoid contention; using MAX6803US26D3 in such configurations may cause excessive current or logic conflict.
MAX6803US26D3 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:
- 2.63V
- 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-23-4
MAX6803US26D3 FAQ
1.How can I place an order for MAX6803US26D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6803US26D3 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 MAX6803US26D3 reliable?
The price and inventory of MAX6803US26D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6803US26D3 is usually 5 days.
3.What payment methods are accepted for MAX6803US26D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6803US26D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6803US26D3?
MAX6803US26D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6803US26D3 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 MAX6803US26D3?
For technical support, including MAX6803US26D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6803US26D3 requirements.
6.How does Aetrix verify that MAX6803US26D3 is sourced from the original manufacturer or authorized distributors?
All MAX6803US26D3 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 MAX6803US26D3 meets industry standards.
7.What is the process for return or replacement of MAX6803US26D3?
All MAX6803US26D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6803US26D3, 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 MAX6803US26D3 part is unused and in its original packaging.
Return procedure for MAX6803US26D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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