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Analog Devices Inc./Maxim Integrated MAX811SEUS-T
- Part No.:
- MAX811SEUS-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX811SEUS-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,788
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Product details
Overview
MAX811SEUS-T from Maxim Integrated is an active-low microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 3.0V supply rails with a nominal reset threshold of 2.93V, 140ms minimum reset pulse width, and 6µA supply current. It asserts RESET during power-up, brownout, or manual reset events in portable and embedded systems.
For engineers reviewing the MAX811SEUS-T datasheet, MAX811SEUS-T pinout, MAX811SEUS-T application, or MAX811SEUS-T equivalent, this page delivers verified electrical parameters, thermal behavior across -40°C to +85°C, MR debounce capability, VCC transient immunity up to 40µs at 125mV overdrive, and design guidance for bidirectional µP reset I/O interfacing.
Technical Context
The MAX811SEUS-T implements a precision voltage comparator with factory-trimmed 2.93V threshold (±1.5% over temperature), internal 140ms timeout timer, and debounced manual reset input (MR) with 20kΩ internal pull-up. Its active-low RESET output remains valid down to VCC = 1V and exhibits guaranteed logic state during power ramp-up and brownout recovery.
It operates across 1.2V to 5.5V supply range but is specified for 3.3V nominal operation (T/S variants); reset assertion occurs when VCC falls below 2.93V, and release is delayed by ≥140ms after VCC exceeds threshold. Transient immunity is characterized for negative-going VCC glitches ≤40µs at 125mV overdrive (T/S versions).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% over -40°C to +85°C - ensures reliable detection before system ICs drop below minimum operating voltage |
| Reset Pulse Width | ≥140ms - guarantees sufficient time for µP initialization and peripheral stabilization |
| Supply Current | 6µA typical at +25°C - enables multi-year battery life in portable equipment |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and allows use with 3V/3.3V/5V systems |
| MR Input Threshold | VIL = 0.25×VCC, VIH = 0.7×VCC - compatible with TTL/CMOS logic and open-drain drivers without external level shifting |
| RESET Output Drive | ISINK = 1.2mA at VCC = VTH(MIN), VOL ≤ 0.4V - directly drives standard CMOS µP reset inputs |
| Tempco | 30ppm/°C - maintains tight threshold stability across industrial temperature range |
Pinout & Package
MAX811SEUS-T is housed in a 4-pin SOT143 package (4.0 × 2.0 × 1.75 mm, lead pitch 0.95 mm), surface-mount, RoHS-compliant, with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | Monitored voltage rail; powers internal comparator and timer; must be decoupled with 0.1µF capacitor near pin |
| MR | Manual reset input | Active-low; internally pulled up to VCC via 20kΩ resistor; accepts TTL/CMOS logic or momentary switch to GND |
| RESET | Active-low reset output | Open-drain NMOS output; sinks 1.2mA; guaranteed low for VCC ≥ 1V; requires external pull-up for µP interface |
| GND | Ground reference | System ground return path for comparator, timer, and output stage; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timer, and pull-up eliminate discrete R/C networks and reduce BOM count |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset state during deep brownout-critical for fail-safe shutdown in battery-powered devices |
| 140ms minimum reset timeout | Meets JEDEC JESD78 requirements for µP reset duration, preventing premature code execution |
| 20kΩ internal MR pull-up | Enables direct switch-to-ground implementation without external resistor; reduces layout complexity and noise susceptibility |
| Transient immunity up to 40µs @ 125mV overdrive | Rejects common switching noise on VCC lines without false triggering-verified per typical operating characteristics graphs |
Applications
| Portable/Battery-Powered Equipment | Critical µP and µC Power Monitoring |
|---|---|
Use Scenario: Handheld medical meters powered by single-cell Li-ion batteries experiencing gradual discharge and intermittent load spikes. IC Role / Device Role / Timing Role: Supervisory circuit monitoring VCC to assert RESET before µP enters undefined state during <3.0V brownout. Use Value: 6µA quiescent current extends battery life; 2.93V threshold aligns with 3.0V system margin; 140ms pulse ensures full µP reset sequence completion. | Use Scenario: Industrial PLC controller requiring guaranteed restart after AC line sag or backup battery switchover. IC Role / Device Role / Timing Role: Primary power-fail detector generating clean, timed reset signal synchronized to VCC recovery. Use Value: Factory-trimmed 2.93V threshold and 30ppm/°C tempco ensure consistent trip point across temperature; MR input allows operator-initiated diagnostics reset. |
| Intelligent Instruments | Controllers |
Use Scenario: Portable multimeter with EEPROM data logging that must preserve calibration integrity during power interruption. IC Role / Device Role / Timing Role: Voltage monitor asserting RESET to halt µC before supply drops below EEPROM write-voltage threshold. Use Value: RESET validity down to VCC = 1V prevents partial writes; internal MR pull-up simplifies front-panel reset button integration. | Use Scenario: HVAC zone controller using 3.3V rail derived from isolated DC-DC converter subject to startup delay and ripple. IC Role / Device Role / Timing Role: System-level supervisor ensuring µC remains held in reset until regulated 3.3V rail stabilizes and remains within spec. Use Value: Immunity to 40µs VCC transients avoids spurious resets during converter soft-start; SOT143 footprint saves PCB area in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812SEUS-T | Active-high RESET output; identical threshold (2.93V), timing, and package | Requires inverted reset logic or level-shifting for µPs expecting active-low reset | Select MAX812SEUS-T only if host µP or ASIC specifies active-high reset input |
| TPS3123E18DBVR | 2.63V fixed threshold, 200ms reset timeout, 1.2µA supply current, SOT-23-5 package | Lacks manual reset input; smaller footprint but no MR functionality | Choose TPS3123E18DBVR when ultra-low current dominates and manual reset is unnecessary |
Compared with MAX812SEUS-T, the MAX811SEUS-T provides native active-low reset signaling without inversion overhead; versus TPS3123E18DBVR, it trades lower quiescent current for essential MR capability and tighter threshold accuracy at 3.0V systems.
Availability
MAX811SEUS-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical µP and µC power monitoring, and intelligent instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX811SEUS-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, computing, communications, and consumer applications.
The MAX811/MAX812 family was developed specifically for low-power microprocessor supervision in space- and energy-constrained systems, emphasizing minimal external components, guaranteed reset behavior over temperature, and robust noise immunity.
FAQ
What is the exact reset threshold voltage of the MAX811SEUS-T?
The MAX811SEUS-T has a nominal reset threshold voltage of 2.93V, with guaranteed accuracy of ±1.5% over the full operating temperature range of -40°C to +85°C. This value is factory-trimmed and specified in the Electrical Characteristics table under the 'S' suffix designation. The threshold remains stable with a tempco of 30ppm/°C, making the MAX811SEUS-T suitable for precise 3.0V system monitoring where marginal supply dips must trigger reset before downstream ICs malfunction.
Does the MAX811SEUS-T require external components to function?
No, the MAX811SEUS-T requires no external components for basic operation. It integrates a precision voltage reference, reset timeout timer, and 20kΩ internal pull-up resistor on the MR pin. Only a 0.1µF ceramic decoupling capacitor on VCC is recommended for transient immunity. This eliminates discrete R/C networks, reduces PCB area, and improves reliability-key advantages confirmed in the device's "No External Components" feature and typical operating circuit diagrams.
How does the manual reset (MR) input behave on the MAX811SEUS-T?
The MR input on the MAX811SEUS-T is active-low with an internal 20kΩ pull-up to VCC. When pulled low (≤0.25×VCC), it immediately asserts RESET and holds it active for at least 180ms after MR returns high. It accepts TTL/CMOS logic levels and can be driven by a momentary switch to GND-no external debounce circuitry is needed. This behavior is documented in the Pin Description and Detailed Description sections, confirming deterministic reset initiation independent of VCC level.
Can the MAX811SEUS-T operate reliably during fast VCC transients?
Yes, the MAX811SEUS-T is designed to reject fast negative-going VCC transients. For the 'S' variant (2.93V threshold), it tolerates glitches up to 40µs wide when the overdrive (VTH – VCC) is 125mV. This immunity is verified in Typical Operating Characteristics Figure 1 and explicitly stated in Applications Information. Adding a 0.1µF capacitor from VCC to GND further enhances noise rejection-making the MAX811SEUS-T robust in electrically noisy environments like motor-driven or switching-power systems.
What is the minimum VCC voltage at which the MAX811SEUS-T guarantees correct RESET output state?
The MAX811SEUS-T guarantees correct RESET output state (logic low) for VCC down to 1V. Below 1V, the RESET output becomes high-impedance and no longer actively sinks current. This specification is explicitly stated in the General Description and Detailed Description sections, and distinguishes the MAX811SEUS-T from alternatives lacking such low-VCC validity-enabling safe, predictable reset behavior during deep brownout conditions common in battery-powered applications.
MAX811SEUS-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX811SEUS-T FAQ
1.How can I place an order for MAX811SEUS-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX811SEUS-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 MAX811SEUS-T reliable?
The price and inventory of MAX811SEUS-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX811SEUS-T is usually 5 days.
3.What payment methods are accepted for MAX811SEUS-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX811SEUS-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX811SEUS-T?
MAX811SEUS-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX811SEUS-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 MAX811SEUS-T?
For technical support, including MAX811SEUS-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX811SEUS-T requirements.
6.How does Aetrix verify that MAX811SEUS-T is sourced from the original manufacturer or authorized distributors?
All MAX811SEUS-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 MAX811SEUS-T meets industry standards.
7.What is the process for return or replacement of MAX811SEUS-T?
All MAX811SEUS-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX811SEUS-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 MAX811SEUS-T part is unused and in its original packaging.
Return procedure for MAX811SEUS-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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