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Analog Devices Inc./Maxim Integrated MAX811SEUS+TG50
- Part No.:
- MAX811SEUS+TG50
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX811SEUS+TG50.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,244
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Product details
Overview
MAX811SEUS+TG50 from Maxim Integrated is a low-power microprocessor supervisory circuit that monitors 3.08V supply voltage, asserts an active-low reset signal for ≥140ms after power-up, and features a debounced manual reset input-used in portable battery-powered equipment, controllers, and intelligent instruments to prevent μP code execution errors during brownout or power-down.
For engineers reviewing the MAX811SEUS+TG50 datasheet, MAX811SEUS+TG50 pinout, MAX811SEUS+TG50 application, or MAX811SEUS+TG50 equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1V, 2.7–10µA supply current across temperature, ±0.05V reset threshold accuracy over –40°C to +85°C, and immunity to <100ns MR glitches and <20µs VCC transients at 3.08V threshold.
Technical Context
The MAX811SEUS+TG50 implements a precision bandgap-based voltage comparator with internal 140ms reset timeout timer and 20kΩ MR pull-up resistor. Its reset assertion logic guarantees active-low output state for VCC ≥1V and holds RESET low until VCC exceeds 3.08V (±0.05V) and remains stable for the full timeout period.
It operates across 1.2–5.5V supply range with transient immunity achieved via comparator overdrive tolerance: a 125mV dip below VTH triggers reset only if sustained >20µs. The device requires no external components and interfaces directly to TTL/CMOS logic or open-drain drivers on MR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±0.05V at +25°C; ensures reliable reset assertion before system ICs drop below minimum operating voltage |
| Supply Current | 2.7–10µA at VCC = 3.6V; enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 140–560ms; provides sufficient hold time for slow-ramping 3.3V supplies and μP initialization sequences |
| VCC Range | 1.2–5.5V; supports direct use with 3V, 3.3V, and 5V systems without level-shifting |
| MR Glitch Immunity | 100ns; rejects EMI-induced noise on manual reset line without external RC filtering |
| RESET Validity | Guaranteed low for VCC ≥1V; maintains deterministic state during deep brownout recovery |
Pinout & Package
MAX811SEUS+TG50 is housed in a 4-pin SOT143 package (package code U4+1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for reset comparator, timer, and MR input; must be low-impedance connection to system ground plane |
| RESET (Pin 2) | Active-low reset output | Open-drain NMOS output sinking up to 1.2mA; requires external pull-up for μP reset I/O compatibility |
| MR (Pin 3) | Manual reset input | Active-low, internally pulled up to VCC via 20kΩ; accepts TTL/CMOS logic or momentary switch to GND |
| VCC (Pin 4) | Supply voltage input | Accepts 1.2–5.5V; powers internal comparator, timer, and MR pull-up; decoupling capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Pre-trimmed 3.08V threshold | Eliminates factory calibration; achieves ±0.05V accuracy over –40°C to +85°C without external resistors |
| 140ms minimum reset pulse width | Exceeds typical μP power-on reset requirement (≥100ms), ensuring full core and peripheral initialization |
| 20kΩ internal MR pull-up | Removes need for external pull-up resistor; reduces BOM count and PCB area in space-constrained designs |
| 1V minimum VCC operation | Enables valid reset signaling during ultra-low-power wake-up sequences where supply ramps slowly from near-zero |
| Transient-immune comparator | Rejects VCC dips <20µs at 125mV overdrive, preventing spurious resets in noisy industrial or automotive environments |
Applications
| Portable Medical Sensors | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered glucose monitor with ARM Cortex-M0+ MCU requiring reliable cold-start reset after battery insertion or deep sleep wake-up. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET until 3.08V rail stabilizes and holds for ≥140ms. Use Value: Prevents corrupted ADC calibration and BLE radio initialization by guaranteeing μP remains held in reset until regulated 3.3V supply meets timing and voltage specs. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 3.3V I/O power domain subject to 100ms AC line sags. IC Role / Device Role / Timing Role: Voltage monitor detecting brownout on 3.3V logic rail and triggering system-wide reset via opto-isolated reset chain. Use Value: Ensures deterministic state recovery after voltage sag by asserting reset for full 140ms timeout-even when VCC recovers in <10ms-eliminating watchdog timeouts and firmware lockup. |
| Smart Energy Meters | Handheld Test Equipment |
Use Scenario: ANSI C12.20-compliant electricity meter with dual-supply (3.3V logic, 5V metrology) and tamper-detection circuitry. IC Role / Device Role / Timing Role: Dedicated supervisor for 3.3V microcontroller domain, triggered by either VCC dropout or MR signal from tamper switch. Use Value: Guarantees secure boot integrity by holding μP in reset during power interruption events lasting <500ms-preventing partial flash writes or crypto key exposure. | Use Scenario: Portable oscilloscope with FPGA-based acquisition engine and Li-ion battery pack delivering 3.0–3.6V under load. IC Role / Device Role / Timing Role: Reset generator monitoring battery-derived 3.3V rail, with MR tied to front-panel reset button. Use Value: Enables one-button hardware reset without firmware involvement; internal MR debounce eliminates contact bounce artifacts that could cause double-reset or missed commands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G30DBVR | 3.0V threshold, 350ms fixed timeout, 1.4µA quiescent current, SOT-23-5 package | Lacks manual reset input; requires external pull-up on /RESET; higher pin count | Select when ultra-low supply current is critical and MR functionality is implemented elsewhere |
| ADM6710L30ARJZ-R7 | 3.0V threshold, 200ms timeout, 1.5µA ICC, 6-lead SOT-23 with watchdog timer | Includes watchdog function not present in MAX811SEUS+TG50; larger footprint and higher cost | Select when system-level watchdog supervision is required alongside power-on reset |
Compared with TPS3808G30DBVR and ADM6710L30ARJZ-R7, the MAX811SEUS+TG50 offers integrated manual reset with internal pull-up and minimal 4-pin SOT143 footprint-making it optimal for cost-sensitive, space-constrained 3.08V rail monitoring where dedicated MR is mandatory and watchdog capability is unnecessary.
Availability
MAX811SEUS+TG50 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC controllers, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MAX811SEUS+TG50 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, communications, and consumer applications.
The MAX811/MAX812 product line delivers compact, low-power voltage supervisors for microprocessor reset generation-optimized for battery-operated and space-constrained systems needing guaranteed reset timing and manual reset integration without external components.
FAQ
What is the exact reset threshold voltage of the MAX811SEUS+TG50?
The MAX811SEUS+TG50 has a nominal reset threshold of 3.08V, with guaranteed limits of 3.00V to 3.15V over the full –40°C to +85°C operating temperature range. This value is laser-trimmed at wafer test and does not require external resistor networks or calibration. The 'T' suffix in the part number explicitly denotes the 3.08V variant per Maxim's ordering matrix.
Does the MAX811SEUS+TG50 support manual reset functionality, and how is it implemented?
Yes, the MAX811SEUS+TG50 includes a dedicated manual reset (MR) input on Pin 3. It is an active-low input with an internal 20kΩ pull-up resistor to VCC, allowing direct connection to a normally open pushbutton switch to ground-no external components required. A logic-low pulse ≥10µs on MR forces RESET low for the full 140ms timeout period, even if MR returns high earlier.
Can the MAX811SEUS+TG50 operate reliably at VCC = 1.2V?
Yes, the MAX811SEUS+TG50 is fully specified to operate down to VCC = 1.2V over temperature. Its RESET output remains a valid active-low signal for VCC ≥1V, and its internal comparator continues accurate threshold detection. At 1.2V, supply current drops to ~2.7µA, making it suitable for ultra-low-voltage brownout detection in energy-harvesting or backup-battery systems.
What is the maximum VCC transient duration the MAX811SEUS+TG50 can ignore at its 3.08V threshold?
For a VCC dip of 125mV below the 3.08V threshold (i.e., to 2.955V), the MAX811SEUS+TG50 will not assert reset if the transient lasts ≤20µs. This immunity is specified for the 'T', 'S', and 'R' variants (3.08V, 2.93V, 2.63V thresholds) and is validated across –40°C to +85°C. A 0.1µF ceramic capacitor placed at the VCC pin further enhances this immunity.
Is the MAX811SEUS+TG50 pin-compatible with other MAX811 variants like MAX811LEUS+T?
Yes, all MAX811 variants-including MAX811SEUS+TG50 and MAX811LEUS+T-share identical 4-pin SOT143 pinout (GND, RESET, MR, VCC) and mechanical footprint. The only differences are reset threshold voltage (3.08V vs. 4.63V) and RoHS status ('+TG50' denotes lead-free with specific tape-and-reel packaging). No PCB layout change is needed when substituting between MAX811 threshold variants.
MAX811SEUS+TG50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX811SEUS+TG50 FAQ
1.How can I place an order for MAX811SEUS+TG50 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811SEUS+TG50 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 MAX811SEUS+TG50 reliable?
The price and inventory of MAX811SEUS+TG50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811SEUS+TG50 is usually 5 days.
3.What payment methods are accepted for MAX811SEUS+TG50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811SEUS+TG50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811SEUS+TG50?
MAX811SEUS+TG50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811SEUS+TG50 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 MAX811SEUS+TG50?
For technical support, including MAX811SEUS+TG50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811SEUS+TG50 requirements.
6.How does Aetrix verify that MAX811SEUS+TG50 is sourced from the original manufacturer or authorized distributors?
All MAX811SEUS+TG50 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 MAX811SEUS+TG50 meets industry standards.
7.What is the process for return or replacement of MAX811SEUS+TG50?
All MAX811SEUS+TG50 units undergo pre-shipment inspection (PSI). If there is an issue with MAX811SEUS+TG50, 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 MAX811SEUS+TG50 part is unused and in its original packaging.
Return procedure for MAX811SEUS+TG50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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