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Analog Devices Inc./Maxim Integrated MAX6802UR46D3+T
- Part No.:
- MAX6802UR46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6802UR46D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,296
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Product details
Overview
MAX6802UR46D3+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.63V power supplies in embedded systems. It asserts reset during VCC brownout or power-up, holds reset for ≥100ms after VCC recovers, operates down to 1.0V supply, draws only 5µA at 5V, and is housed in a 3-pin SOT23 package for space-constrained industrial controllers.
For engineers reviewing the MAX6802UR46D3+T datasheet, MAX6802UR46D3+T pinout, MAX6802UR46D3+T application, or MAX6802UR46D3+T equivalent, key selection criteria include its factory-trimmed 4.63V reset threshold (±3% over –40°C to +125°C), 100ms minimum timeout, open-drain output with 50µA sink capability, guaranteed operation to VCC = 1.0V, and immunity to fast VCC transients.
Technical Context
The MAX6802UR46D3+T implements a precision bandgap-based reset comparator with factory-trimmed 4.63V threshold and ±3% tolerance across –40°C to +125°C. Its open-drain RESET output requires an external pullup and sinks up to 50µA while asserted, enabling bidirectional reset interfacing with µPs like the Motorola 68HC11.
Reset assertion is triggered when VCC falls below 4.63V and remains active for a guaranteed minimum 100ms after VCC rises above threshold. The device ignores transients ≤30µs at 100mV overdrive and maintains valid reset state down to VCC = 1.0V - unlike the MAX6800/MAX6801 which operate to 0.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±3% over –40°C to +125°C - ensures reliable detection of 4.63V supply undervoltage without false triggers |
| Reset Timeout Period | ≥100ms - guarantees sufficient hold time for microprocessor initialization after power recovery |
| Supply Voltage Range | 1.0V to 5.5V - supports operation during deep brownout conditions where VCC drops near 1.0V |
| Supply Current | 5µA typical at VCC = 5.0V - enables ultra-low-power monitoring in battery-backed systems |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and direct interface with bidirectional µP reset pins |
| VOL (RESET asserted) | ≤0.4V at ISINK = 50µA, VCC ≥ 1.0V - ensures solid logic-low level even at minimum operating voltage |
| Transient Immunity | Rejects VCC glitches ≤30µs at 100mV overdrive - prevents spurious resets from noise or coupling |
Pinout & Package
MAX6802UR46D3+T is packaged in a RoHS-compliant 3-pin SOT23 (U3-1) with 1.3mm × 2.9mm footprint and 0.95mm height, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane for stable reset threshold |
| 2 - RESET | Active-low open-drain output | Drives low during reset; requires external pullup resistor (typically 10–100kΩ) to VCC or another rail for proper logic-level translation |
| 3 - VCC | Power supply input | Monitored voltage source; powers internal circuitry and defines reset threshold reference - no external decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V threshold | Eliminates need for external resistive divider or calibration - reduces BOM count and layout area |
| 100ms minimum reset timeout | Ensures full µP core and peripheral initialization before release - avoids race conditions in complex boot sequences |
| 1.0V minimum operating voltage | Guarantees reset assertion integrity during severe brownout - critical for fail-safe shutdown in industrial power systems |
| 4.0µA to 5.0µA supply current | Enables continuous monitoring in energy-harvesting or coin-cell-powered devices without compromising battery life |
| Open-drain output architecture | Supports multi-source reset arbitration and compatibility with legacy µPs having bidirectional reset pins (e.g., 68HC11) |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLCs and motor drives requiring deterministic reset behavior during AC line sags or DC bus fluctuations. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M or Renesas RX microcontrollers upon 4.63V supply droop. Use Value: Prevents firmware corruption by holding reset ≥100ms until regulated 5V rail stabilizes post-brownout - validated over –40°C to +125°C. | Use Scenario: Handheld diagnostic tools powered by single Li-ion cells (3.0–4.2V nominal) with backup supercapacitor support. IC Role / Device Role / Timing Role: Monitors boosted 4.63V rail derived from buck-boost converter; triggers controlled shutdown before critical voltage collapse. Use Value: Ultra-low 5µA quiescent current extends battery runtime; 1.0V operation ensures last-chance reset assertion as cell discharges to end-of-life. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: ANSI C12.20-compliant meters exposed to wide temperature swings and conducted EMI on 24V auxiliary rails. IC Role / Device Role / Timing Role: Resets meter SoC (e.g., TI MSP430) when 4.63V LDO output dips due to load transients or thermal derating. Use Value: 30µs transient immunity rejects noise from relay switching or RF coupling; ±3% threshold stability ensures compliance across temperature. | Use Scenario: BCMs in 12V vehicle architectures where infotainment subsystems require precise 4.63V domain supervision. IC Role / Device Role / Timing Role: Provides fail-safe reset to NXP S32K144 during cold-crank events where battery voltage collapses to ~6V then recovers. Use Value: Valid reset state maintained down to VCC = 1.0V - guarantees reset assertion even during worst-case cranking profiles per ISO 16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6348UT46D3+T | Same 4.63V threshold, 100ms timeout, open-drain output, but features improved ESD rating (±8kV HBM) and tighter 2.5% threshold tolerance | Preferred for automotive-grade designs requiring AEC-Q100 qualification and higher robustness against board-level ESD events | Select MAX6348UT46D3+T when AEC-Q100 compliance and enhanced ESD immunity are mandatory |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable), push-pull output, 200ms timeout, 1.4µA supply current, same SOT23-3 package | Not suitable for 4.63V monitoring; requires redesign of supply rail or use of external resistor divider to shift threshold | Choose TPS3808G33DBVR only if system uses 3.3V supply and lowest possible quiescent current is prioritized over threshold flexibility |
Compared with MAX6802UR46D3+T, MAX6348UT46D3+T offers tighter threshold accuracy and automotive qualification but at higher cost; TPS3808G33DBVR delivers lower power and faster availability but lacks the required 4.63V threshold and open-drain drive - making MAX6802UR46D3+T the optimal choice for precise 4.63V brownout detection in industrial and medical systems.
Availability
MAX6802UR46D3+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart energy meters, and automotive body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6802UR46D3+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 ultra-low-power, factory-trimmed supervisory circuits for reliable microprocessor reset generation in harsh environments - targeting space-constrained, battery-sensitive, and thermally demanding systems.
FAQ
What is the exact reset threshold voltage of MAX6802UR46D3+T and how tightly is it specified?
The MAX6802UR46D3+T has a factory-trimmed nominal reset threshold of 4.63V, with a guaranteed tolerance of ±3% over the full operating temperature range of –40°C to +125°C. At +25°C, the threshold is specified as 4.547V (min) to 4.713V (max). This precision eliminates the need for external resistor networks and ensures consistent brownout detection across environmental extremes - a key requirement for MAX6802UR46D3+T deployments in industrial automation and medical instrumentation.
Does MAX6802UR46D3+T support operation down to 0V VCC, and what is its minimum functional supply voltage?
No, MAX6802UR46D3+T does not guarantee operation down to 0V VCC. Its absolute minimum functional supply voltage is 1.0V, with full specification guaranteed from 1.0V to 5.5V. Below 1.0V, reset assertion is not assured - unlike the MAX6800/MAX6801 variants which operate to 0.7V. This 1.0V limit is explicitly stated in the Electrical Characteristics table and reflects the design trade-off for open-drain output robustness in MAX6802UR46D3+T.
What is the purpose of the open-drain output in MAX6802UR46D3+T, and how should it be configured externally?
The open-drain output in MAX6802UR46D3+T enables wired-OR reset bus configurations and direct interfacing with microprocessors that have bidirectional reset pins (e.g., Motorola 68HC11). It must be used with an external pullup resistor - typically 10kΩ to 100kΩ - connected between the RESET pin and the target µP's VCC or I/O rail. This configuration allows either the MAX6802UR46D3+T or the µP itself to assert reset, providing flexible system-level fault recovery - a capability not available with push-pull alternatives.
How does MAX6802UR46D3+T handle fast voltage transients on the VCC line, and what is its immunity specification?
MAX6802UR46D3+T incorporates a reset comparator designed to reject fast negative-going VCC transients. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Comparator Overdrive", it tolerates transients up to 30µs in duration when the overdrive is 100mV. This immunity prevents spurious resets caused by switching noise, relay bounce, or EMI coupling - a critical feature for MAX6802UR46D3+T in electrically noisy industrial environments where clean power sequencing is difficult to maintain.
Is MAX6802UR46D3+T pin-compatible with other members of the MAX6800 family or industry-standard supervisors?
Yes, MAX6802UR46D3+T is pin-compatible with all MAX6800/MAX6801/MAX6802 variants in the 3-pin SOT23 package, sharing identical pinout (GND, RESET, VCC). It is also pin-compatible with MAX809/MAX810, MAX6326/MAX6327/MAX6328, and MAX6346/MAX6347/MAX6348 - enabling drop-in replacement in existing designs without PCB modification, provided the reset threshold, timeout, and output type meet system requirements.
MAX6802UR46D3+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:
- 4.63V
- 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
MAX6802UR46D3+T FAQ
1.How can I place an order for MAX6802UR46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6802UR46D3+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 MAX6802UR46D3+T reliable?
The price and inventory of MAX6802UR46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6802UR46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6802UR46D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6802UR46D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6802UR46D3+T?
MAX6802UR46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6802UR46D3+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 MAX6802UR46D3+T?
For technical support, including MAX6802UR46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6802UR46D3+T requirements.
6.How does Aetrix verify that MAX6802UR46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6802UR46D3+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 MAX6802UR46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6802UR46D3+T?
All MAX6802UR46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6802UR46D3+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 MAX6802UR46D3+T part is unused and in its original packaging.
Return procedure for MAX6802UR46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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