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Analog Devices Inc./Maxim Integrated MAX811REUS+T
- Part No.:
- MAX811REUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811REUS+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
The MAX811REUS+T from Maxim Integrated is a low-power microprocessor supervisory circuit that monitors 3.0V supply voltage and asserts an active-low reset signal when VCC drops below 2.63V, with guaranteed RESET validity down to VCC = 1V, 140ms minimum reset timeout, and 6µA supply current - used in battery-powered microcontroller systems for reliable power-on/brownout recovery.
For engineers reviewing the MAX811REUS+T datasheet, MAX811REUS+T pinout, MAX811REUS+T application, or MAX811REUS+T equivalent, key selection criteria include reset threshold accuracy (±0.05V over temperature), manual reset input immunity (100ns glitch rejection), SOT143 package compatibility, and guaranteed operation across –40°C to +85°C industrial temperature range.
Technical Context
The MAX811REUS+T implements a precision bandgap-based voltage comparator with internal 140ms reset timeout timer and debounced manual reset input (MR) featuring 20kΩ internal pull-up. Its reset assertion logic is strictly level-sensitive: RESET remains low while VCC < VTH or MR = low, then holds low for tRP after either condition clears.
It provides no watchdog or window-detection functionality - only single-threshold undervoltage monitoring. The R-suffix denotes 2.63V nominal reset threshold, validated for 3V ±5% supplies, with 30ppm/°C tempco and immunity to transients ≤125mV overdrive for durations ≤20µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (2.55V to 2.70V over –40°C to +85°C); matches 3V system brownout margin before µP functional failure. |
| Supply Current | 2.7µA typical at 3.6V (–40°C to +85°C); enables >10-year battery life in coin-cell–powered IoT sensors. |
| Reset Timeout | 140ms minimum (up to 560ms); ensures full µP initialization and clock stabilization before release. |
| MR Glitch Immunity | 100ns maximum; rejects EMI-induced noise on manual reset line without external RC filtering. |
| RESET Validity Range | Guaranteed low-state output down to VCC = 1V; maintains deterministic reset state during deep brownout. |
| Operating Temp | –40°C to +85°C; qualified for industrial embedded control and automotive body electronics environments. |
| VCC Range | 1.2V to 5.5V; supports operation during partial power-up sequences and backup-supply handover. |
Pinout & Package
MAX811REUS+T uses a 4-pin SOT143 package (outline 21-0052, land pattern 90-0183), measuring 2.9mm × 1.3mm × 1.0mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for all internal comparators and timer; must be low-impedance connection to system ground plane. |
| RESET (Pin 2) | Active-low reset output | Open-drain NMOS output; requires external pull-up to VCC or µP I/O rail; sinks ≥1.2mA at VCC = VTH(MIN). |
| MR (Pin 3) | Manual reset input | Active-low, internally pulled up to VCC via 20kΩ resistor; accepts TTL/CMOS logic or momentary switch to GND. |
| VCC (Pin 4) | Supply input | Accepts 1.2V–5.5V; powers internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates precision voltage reference, comparator, timer, and pull-up resistor - eliminates BOM cost and layout area for discrete supervision circuits. |
| Guaranteed RESET down to VCC = 1V | Ensures deterministic reset state during severe brownout or battery depletion, preventing µP latch-up or undefined execution. |
| 140ms min power-on reset pulse | Meets or exceeds reset timing requirements of ARM Cortex-M0+, PIC16F, and MSP430 microcontrollers without external timing capacitors. |
| 20kΩ internal MR pull-up | Enables direct switch-to-ground interface with no external resistor; simplifies PCB routing and reduces component count. |
| 30ppm/°C reset threshold tempco | Maintains tight threshold stability across industrial temperature range - avoids false resets in thermal-cycling environments. |
Applications
| Industrial PLC I/O Modules | Battery-Powered Sensor Nodes |
|---|---|
Use Scenario: Programmable logic controller modules operating in factory-floor environments with fluctuating 24VDC-derived 3.3V rails subject to load-switching transients. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M4 µP during undervoltage events and operator-initiated diagnostics. Use Value: Prevents corrupted I/O register writes and firmware crashes by holding µP in reset until 3.3V rail stabilizes above 2.63V for ≥140ms. | Use Scenario: Wireless environmental sensor node powered by CR2032 coin cell, transmitting temperature/humidity data every 5 minutes. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown and nonvolatile state save before VCC falls below µP operational minimum. Use Value: Extends usable battery life by enabling operation down to 1.2V while guaranteeing safe reset assertion before logic failure occurs. |
| Medical Handheld Diagnostics | Automotive Body Control Units |
Use Scenario: Portable blood glucose meter with USB charging and LCD display, requiring fail-safe startup after battery insertion or charger disconnect. IC Role / Device Role / Timing Role: Power-on supervisor generating clean reset pulse to MSP430FR59xx MCU, synchronized with LDO enable sequence. Use Value: Eliminates need for RC-based reset circuits, reducing bill-of-materials and improving startup reliability across 0°C–50°C operating range. | Use Scenario: Door module controlling power windows and locks, powered from vehicle battery with transient suppression per ISO 7637-2. IC Role / Device Role / Timing Role: Supply monitor detecting battery dips below 9V (mapped to 3V rail via regulator), asserting reset to Infineon AURIX TC234L. Use Value: Provides immunity to 20µs/125mV negative transients during load dump, preventing spurious resets during engine cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | 2.63V threshold, but active-high RESET output and 350ms fixed timeout; 1.8V–6.0V VCC range. | Requires level-shifting or µP configuration change for active-high reset input; longer timeout may delay system boot. | Select if system design already uses active-high reset architecture and benefits from wider VCC range. |
| STM811SW12F3F | 2.63V threshold, active-low RESET, but 160ms min timeout and 10µA max ICC at 3.3V; -40°C to +105°C rating. | Higher supply current reduces battery life; extended temperature range suits under-hood automotive use. | Select for automotive under-hood applications requiring >+85°C operation and where 4µA extra current is acceptable. |
Compared with TPS3808G12DBVR and STM811SW12F3F, the MAX811REUS+T offers the lowest quiescent current (2.7µA typ), guaranteed RESET validity down to 1V, and optimal 140ms timeout for fast-boot µPs - making it preferred for space-constrained, battery-critical designs.
Availability
MAX811REUS+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered sensor nodes, medical handheld diagnostics, automotive body control units, and portable instrumentation requiring stable component supply across long production lifecycles.
Supply support for MAX811REUS+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 MAX811/MAX812 family was engineered specifically for low-cost, high-reliability microprocessor supervision in space- and power-constrained systems - delivering integrated voltage monitoring, manual reset, and robust transient immunity in a 4-pin SOT143 package.
FAQ
What is the exact reset threshold voltage of the MAX811REUS+T?
The MAX811REUS+T has a nominal reset threshold of 2.63V, with guaranteed limits of 2.55V (minimum) to 2.70V (maximum) over the full –40°C to +85°C operating temperature range. This threshold is factory-trimmed and specified in the Electrical Characteristics table of the official Maxim Integrated datasheet Rev 6 (5/18), ensuring precise brownout detection for 3V systems.
Does the MAX811REUS+T provide manual reset functionality?
Yes, the MAX811REUS+T includes a dedicated manual reset input (MR, Pin 3) that is active-low and features an internal 20kΩ pull-up resistor. A logic-low pulse ≥10µs on MR forces RESET low for at least 140ms after MR returns high. This allows pushbutton or external logic to initiate a system reset without external components - a core feature confirmed in the Typical Operating Circuit and Pin Description sections of the MAX811REUS+T datasheet.
What is the supply current consumption of the MAX811REUS+T?
The MAX811REUS+T draws only 2.7µA typical supply current at VCC = 3.6V and –40°C to +85°C, with a maximum of 10µA. This ultra-low ICC is measured under defined test conditions (VCC = 3.6V, IOUT = 0) and is critical for extending battery life in portable equipment - a value explicitly listed in the Electrical Characteristics table of the MAX811REUS+T datasheet Rev 6.
Is the MAX811REUS+T pin-compatible with other MAX811 variants?
Yes, all MAX811 variants including MAX811REUS+T share identical 4-pin SOT143 pinout (GND, RESET, MR, VCC) and footprint. The R-suffix denotes only the 2.63V reset threshold; electrical behavior, timing, and package dimensions are fully consistent across the MAX811 family - enabling drop-in replacement within the same threshold group without PCB changes, as confirmed in the Ordering Information and Package Information sections.
What is the minimum VCC voltage at which the MAX811REUS+T guarantees valid RESET output?
The MAX811REUS+T guarantees its active-low RESET output remains a valid logic low down to VCC = 1V - a defining specification for the MAX811 (vs. MAX812's active-high output). Below 1V, RESET becomes high-impedance; this behavior is documented in the Detailed Description and Absolute Maximum Ratings sections of the MAX811REUS+T datasheet and enables safe operation during deep brownout conditions.
MAX811REUS+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:
- 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 Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX811REUS+T FAQ
1.How can I place an order for MAX811REUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811REUS+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 MAX811REUS+T reliable?
The price and inventory of MAX811REUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811REUS+T is usually 5 days.
3.What payment methods are accepted for MAX811REUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811REUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811REUS+T?
MAX811REUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811REUS+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 MAX811REUS+T?
For technical support, including MAX811REUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811REUS+T requirements.
6.How does Aetrix verify that MAX811REUS+T is sourced from the original manufacturer or authorized distributors?
All MAX811REUS+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 MAX811REUS+T meets industry standards.
7.What is the process for return or replacement of MAX811REUS+T?
All MAX811REUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX811REUS+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 MAX811REUS+T part is unused and in its original packaging.
Return procedure for MAX811REUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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