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Analog Devices Inc./Maxim Integrated MAX6802UR29D3+T
- Part No.:
- MAX6802UR29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6802UR29D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
MAX6802UR29D3+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed to monitor 2.93V power supplies with ±1.8% threshold accuracy at +25°C and ±3% over -40°C to +125°C, asserting reset for ≥100ms after VCC rises above threshold, and operating down to VCC = 1.0V. It delivers ultra-low 4–12µA supply current and supports critical μP reset sequencing in battery-powered instrumentation.
For engineers reviewing the MAX6802UR29D3+T datasheet, MAX6802UR29D3+T pinout, MAX6802UR29D3+T application, or MAX6802UR29D3+T equivalent, key selection criteria include its 2.93V factory-trimmed reset threshold, 100ms minimum timeout period, open-drain output structure requiring external pull-up, guaranteed operation down to 1.0V VCC, and immunity to fast VCC transients up to 30µs at 100mV overdrive.
Technical Context
The MAX6802UR29D3+T implements a precision bandgap-based reset comparator with factory-trimmed 2.93V threshold and hysteresis optimized for brownout detection. Its open-drain RESET output enables wired-OR interfacing with bidirectional microcontroller reset pins (e.g., Motorola 68HC11) and supports level translation across voltage domains via external pull-up.
Reset assertion is triggered when VCC falls below 2.93V (±1.8% at +25°C), held active for ≥100ms after VCC exceeds threshold, with propagation delay <30µs during VCC fall at 10V/ms. The device maintains valid RESET state down to VCC = 1.0V, unlike push/pull variants that operate to 0.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.8% at +25°C; ±3% over -40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| Reset Timeout Period | 100ms (min), 150ms (typ), 200ms (max) - guarantees sufficient hold time for μP initialization and peripheral stabilization |
| Supply Current | 4µA (typ) at VCC = +3.0V; 5µA (typ) at VCC = +5.0V - enables multi-year battery life in portable equipment |
| Operating VCC Range | 1.0V to 5.5V - supports operation during deep brownout while maintaining reset validity |
| RESET Output Type | Open-drain, active-low - allows shared reset bus, level shifting, and compatibility with bidirectional μP reset pins |
| VOL (RESET asserted) | 0.4V max at ISINK = 50µA, VCC ≥ 1.0V - ensures solid logic-low under light load for reliable μP reset assertion |
| Transient Immunity | Rejects VCC glitches ≤30µs wide at 100mV overdrive - prevents false resets from switching noise or ESD-induced dips |
Pinout & Package
MAX6802UR29D3+T is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 (RESET) | Open-drain active-low reset output | Requires external pull-up resistor (typically 10kΩ–100kΩ) to VCC or another logic rail; sinks current only when asserted |
| 3 (VCC) | Supply voltage input | Monitored power rail; powers internal circuitry and defines reset threshold reference; absolute max = +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.93V threshold | Eliminates external resistor divider and calibration, reducing BOM count and layout area in μP reset circuits |
| 100ms minimum reset timeout | Ensures full μP core and peripheral initialization before release, compatible with slow-start DC/DC converters |
| Open-drain output architecture | Enables direct interface to bidirectional reset pins (e.g., 68HC11) and supports multiple supervisors on shared reset bus |
| 1.0V minimum operating VCC | Maintains valid reset assertion during severe brownout conditions where push/pull variants fail below 0.7V |
| 4µA typical supply current | Minimizes quiescent drain on coin-cell or Li-SOCl₂ batteries in always-on monitoring applications |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meters and pulse oximeters require reliable power-on reset and brownout protection during intermittent battery discharge. IC Role / Device Role / Timing Role: MAX6802UR29D3+T monitors the 3.3V system rail and asserts open-drain RESET to the ARM Cortex-M0+ MCU until stable voltage is confirmed. Use Value: 4µA supply current extends single-CR2032 battery life beyond 5 years; 100ms timeout accommodates slow LDO startup; open-drain output interfaces cleanly with MCU's bidirectional reset pin. |
Use Scenario: DIN-rail mounted PLC modules operate in harsh environments with wide temperature swings and noisy 24VDC field power. IC Role / Device Role / Timing Role: MAX6802UR29D3+T supervises the isolated 3.3V logic supply derived from 24VDC, asserting RESET during undervoltage events caused by cable voltage drop or transient load spikes. Use Value: ±3% threshold tolerance over -40°C to +125°C ensures consistent trip point across ambient extremes; 30µs transient immunity rejects switching noise from adjacent relay drivers. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: ANSI C12.20-compliant electricity meters use supercapacitors for backup power during AC mains failure, requiring precise 2.93V brownout detection. IC Role / Device Role / Timing Role: MAX6802UR29D3+T monitors the 3.3V backup rail and holds the metering SoC in reset until capacitor voltage recovers above 2.93V. Use Value: Factory-trimmed 2.93V threshold eliminates calibration labor; 100ms timeout prevents premature wake-up during capacitor recharge transients. |
Use Scenario: BCMs in 12V automotive systems must survive cold-crank (down to 3.0V) and load-dump events while maintaining deterministic reset behavior. IC Role / Device Role / Timing Role: MAX6802UR29D3+T supervises the 5.0V domain powering CAN transceivers and microcontrollers, asserting RESET during cranking-induced brownouts. Use Value: Valid operation down to VCC = 1.0V ensures reset remains asserted even as input drops below regulator dropout; open-drain output simplifies integration with existing 5V pull-up networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UT29D3+T | Push/pull active-low RESET; operates down to 0.7V VCC; same 2.93V threshold and 100ms timeout | Requires no external pull-up; not suitable for wired-OR or bidirectional reset bus configurations | Select when board layout lacks space for pull-up resistor or when driving high-capacitance reset lines directly |
| TPS3808G33DBVR | Push/pull active-low RESET; 3.3V fixed threshold; 200ms timeout; 1.4µA supply current; operates down to 0.9V | Fixed threshold eliminates factory trim variation but lacks flexibility for non-standard supply rails | Select when 3.3V rail supervision is sufficient and lowest possible quiescent current is prioritized over threshold programmability |
Compared with MAX6802UR29D3+T, MAX6327UT29D3+T offers simpler drive capability but forfeits bus-sharing flexibility, while TPS3808G33DBVR reduces current draw by 70% but locks threshold at 3.3V-making MAX6802UR29D3+T optimal for 2.93V rails needing open-drain interoperability.
Availability
MAX6802UR29D3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for MAX6802UR29D3+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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX6800/MAX6801/MAX6802 family delivers cost-effective, space-saving μP supervisory circuits with factory-trimmed thresholds and configurable reset timeouts for reliable power monitoring in resource-constrained systems.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6802UR29D3+T?
The MAX6802UR29D3+T has a factory-trimmed reset threshold of 2.93V, with ±1.8% accuracy at +25°C and ±3% tolerance over the full -40°C to +125°C operating temperature range. This value is permanently programmed during manufacturing and does not require external components or calibration. The "29" suffix in MAX6802UR29D3+T explicitly denotes the 2.93V threshold variant per Maxim's Selector Guide.
Does MAX6802UR29D3+T require an external pull-up resistor on the RESET pin?
Yes, MAX6802UR29D3+T requires an external pull-up resistor on the RESET pin because it features an open-drain output structure. A typical value is 10kΩ to 100kΩ connected between RESET and the target logic rail (e.g., VCC or 3.3V). Without this resistor, the RESET signal cannot achieve a valid high-impedance or logic-high state, rendering the supervisor nonfunctional in most microcontroller interfaces.
What is the minimum supply voltage at which MAX6802UR29D3+T guarantees correct reset output behavior?
MAX6802UR29D3+T guarantees correct RESET/RESET output behavior down to VCC = 1.0V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. This is higher than the 0.7V minimum for MAX6800/MAX6801 push/pull variants, reflecting the open-drain output stage's requirement for sufficient headroom to sink current reliably.
How long does the reset pulse last for MAX6802UR29D3+T after VCC rises above the threshold?
The reset pulse duration for MAX6802UR29D3+T is guaranteed to be ≥100ms after VCC rises above the 2.93V threshold, with typical and maximum values of 150ms and 200ms respectively. This "D3" timeout configuration is factory-programmed and ensures sufficient hold time for microprocessor initialization, memory self-test, and peripheral configuration before release.
Can MAX6802UR29D3+T be used with microcontrollers that have bidirectional reset pins?
Yes, MAX6802UR29D3+T is specifically suited for microcontrollers with bidirectional reset pins (e.g., Motorola 68HC11) due to its open-drain output. When combined with a single external pull-up resistor, the RESET line becomes a shared bus where either the supervisor or the μP can assert reset - enabling coordinated recovery sequences without additional logic or isolation components.
MAX6802UR29D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6802UR29D3+T FAQ
1.How can I place an order for MAX6802UR29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6802UR29D3+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 MAX6802UR29D3+T reliable?
The price and inventory of MAX6802UR29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6802UR29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6802UR29D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6802UR29D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6802UR29D3+T?
MAX6802UR29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6802UR29D3+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 MAX6802UR29D3+T?
For technical support, including MAX6802UR29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6802UR29D3+T requirements.
6.How does Aetrix verify that MAX6802UR29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6802UR29D3+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 MAX6802UR29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6802UR29D3+T?
All MAX6802UR29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6802UR29D3+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 MAX6802UR29D3+T part is unused and in its original packaging.
Return procedure for MAX6802UR29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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