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Analog Devices Inc./Maxim Integrated MAX812TEUS
- Part No.:
- MAX812TEUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812TEUS.pdf
- Description:
- IC SUPERVISOR UPROCESSR VOLT MON
- Quantity:
- Payment:
- Shipping:
Inventory:2,064
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Product details
Overview
MAX812TEUS from Maxim Integrated is an active-high microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 3.08V power supplies and assert reset during brownout, power-up, or power-down events. It delivers 6µA supply current, guarantees ≥140ms reset pulse width, and features manual reset input with internal 20kΩ pull-up for portable and battery-powered systems.
For engineers reviewing the MAX812TEUS datasheet, MAX812TEUS pinout, MAX812TEUS application, or MAX812TEUS equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), VCC transient immunity (125mV/20µs rejection), guaranteed RESET validity down to VCC = 1V, and compatibility with 3V µP interfaces requiring active-high reset assertion.
Technical Context
The MAX812TEUS implements a precision bandgap-based voltage comparator with factory-trimmed 3.08V reset threshold (T-suffix), operating across -40°C to +85°C. Its internal timer ensures minimum 140ms reset timeout after VCC recovery and supports manual reset via MR pin with 180ms hold time post-release.
It provides active-high RESET output with VOL ≤ 0.4V at ISINK = 1.2mA (VCC = VTH(MIN)), and exhibits 30ppm/°C tempco. The device rejects fast VCC transients-e.g., 20µs negative glitches ≤125mV below threshold-without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±1.5% over -40°C to +85°C - ensures reliable detection before system ICs drop below min operating voltage |
| Supply Current | 6µA typical at +25°C - enables multi-year battery life in portable equipment |
| Reset Pulse Width | ≥140ms minimum - satisfies µP power-on reset timing requirements per Intel/ARM specifications |
| MR Input Threshold | VIL ≤ 0.25×VCC, VIH ≥ 0.7×VCC - compatible with TTL/CMOS logic and open-drain drivers |
| Output Drive | VOL ≤ 0.4V at 1.2mA sink - directly drives standard CMOS µP reset inputs without external buffering |
| Operating Voltage | 1.2V to 5.5V - supports operation during deep brownout while maintaining valid RESET state |
| Tempco | 30ppm/°C - limits threshold drift to <15mV over full temperature range |
Pinout & Package
MAX812TEUS is housed in a 4-pin SOT143 package (4.0 × 2.0 × 1.75 mm), surface-mount, lead-free compatible. Pin 1 = VCC, Pin 2 = MR (manual reset input), Pin 3 = RESET (active-high output), Pin 4 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | Monitored voltage rail; device operates and asserts reset when VCC falls below 3.08V |
| MR | Manual reset input | Active-low; initiates reset when pulled low; internal 20kΩ pull-up allows floating if unused |
| RESET | Active-high reset output | Drives µP reset pin high during fault conditions; remains high for ≥140ms after VCC recovery |
| GND | Ground reference | Return path for VCC, MR, and RESET; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Factory-trimmed for ±1.5% accuracy over temperature - eliminates need for external calibration in 3V systems |
| 140ms minimum reset timeout | Guaranteed duration ensures µP initialization completes before code execution begins |
| 20kΩ internal MR pull-up | Removes need for external resistor - simplifies BOM and PCB layout for manual reset switches |
| 125mV/20µs VCC transient immunity | Rejects common noise spikes on power rails without false resets - improves system robustness in noisy environments |
| 6µA quiescent current | Enables use in always-on battery-backed circuits with >10-year shelf life |
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: MAX812TEUS monitors 3.0V supply and asserts active-high RESET to ARM Cortex-M0 MCU until stable voltage is confirmed. Use Value: 6µA supply current extends single-CR2032 battery life beyond 3 years; 3.08V threshold aligns precisely with Li-ion discharge curve end-of-life voltage. | Use Scenario: DIN-rail mounted PLC modules operate in electrically noisy factory environments with fluctuating 3.3V DC-DC outputs. IC Role / Device Role / Timing Role: MAX812TEUS supervises 3.3V rail and triggers reset on voltage sags caused by motor switching transients. Use Value: 20µs/125mV transient immunity prevents spurious resets during 48V solenoid actuation; SOT143 footprint fits dense industrial PCB layouts. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: ANSI C12.20-compliant electricity meters use supercapacitor backup and require deterministic reset behavior during AC loss events. IC Role / Device Role / Timing Role: MAX812TEUS detects 3.0V backup rail collapse and holds MCU in reset until capacitor recharges above 3.08V. Use Value: Guaranteed RESET validity down to VCC = 1V ensures clean reset assertion even as supercapacitor discharges to 1.2V. | Use Scenario: BCMs in 12V automotive systems use isolated 3.3V supplies derived from buck converters subject to load-dump transients. IC Role / Device Role / Timing Role: MAX812TEUS monitors post-regulator 3.3V rail and initiates controlled shutdown via active-high RESET to Infineon AURIX TC3xx. Use Value: 140ms reset pulse exceeds ISO 16750-2 cold-crank timing requirements; SOT143 meets AEC-Q200 vibration resistance standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | 3.08V threshold, but active-low RESET output and 1.8V min VCC operation | Requires level-shifting or µP with active-low reset input; better suited for ultra-low-voltage systems | Select only if active-low interface and sub-2V operation are required |
| STM6315RWX6F | 3.08V threshold, 140ms timeout, but 10µA supply current and no MR input | Lacks manual reset capability; suitable only for fully automatic supervision without operator intervention | Choose when board space permits larger SOT23-5 and manual reset is unnecessary |
Compared with TPS3123E18DBVR and STM6315RWX6F, the MAX812TEUS uniquely combines active-high RESET, integrated MR input with pull-up, and industry-leading 6µA quiescent current - making it optimal for compact, battery-sensitive 3V systems requiring both automatic and manual reset control.
Availability
MAX812TEUS is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX812TEUS 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 engineered specifically for low-power microprocessor supervision in space-constrained, battery-operated systems - delivering high-accuracy voltage monitoring with minimal external components and zero calibration overhead.
FAQ
What is the exact reset threshold voltage of the MAX812TEUS?
The MAX812TEUS has a factory-trimmed nominal reset threshold of 3.08V, with guaranteed accuracy of ±1.5% over the full operating temperature range (-40°C to +85°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold" for the T-suffix variant, and applies directly to the MAX812TEUS part number.
Does the MAX812TEUS provide manual reset functionality?
Yes, the MAX812TEUS includes a dedicated MR (manual reset) input pin that accepts active-low logic signals. When MR is pulled low, it asserts the active-high RESET output for the duration of the low signal plus an additional 180ms timeout. An internal 20kΩ pull-up resistor allows MR to float if unused - no external components are needed for basic manual reset implementation in the MAX812TEUS.
What is the supply current consumption of the MAX812TEUS at room temperature?
The MAX812TEUS draws 6µA typical supply current at +25°C, as specified in the Electrical Characteristics table under "ICC". This ultra-low quiescent current is measured with VCC = 3.6V for T/S variants and remains stable across temperature - enabling multi-year operation in coin-cell–powered devices using the MAX812TEUS.
Can the MAX812TEUS operate reliably during fast VCC transients?
Yes, the MAX812TEUS is designed to reject fast negative-going VCC transients: it ignores pulses ≤20µs wide when the overdrive (VTH – VCC) is ≤125mV. This immunity is verified in the Typical Operating Characteristics graphs and ensures the MAX812TEUS does not generate false resets during common power rail noise events such as switch-mode regulator ripple or ESD-induced dips.
What package type and dimensions does the MAX812TEUS use?
The MAX812TEUS is supplied in a 4-pin SOT143 package measuring 4.0mm × 2.0mm × 1.75mm, with lead-free termination compliant with RoHS. The pinout is standardized: Pin 1 = VCC, Pin 2 = MR, Pin 3 = RESET, Pin 4 = GND. This compact surface-mount outline is documented in Maxim's Package Outline SOT-143 4L and is identical across all MAX811/MAX812 variants including the MAX812TEUS.
MAX812TEUS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX812TEUS FAQ
1.How can I place an order for MAX812TEUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812TEUS 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 MAX812TEUS reliable?
The price and inventory of MAX812TEUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812TEUS is usually 5 days.
3.What payment methods are accepted for MAX812TEUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812TEUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812TEUS?
MAX812TEUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812TEUS 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 MAX812TEUS?
For technical support, including MAX812TEUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812TEUS requirements.
6.How does Aetrix verify that MAX812TEUS is sourced from the original manufacturer or authorized distributors?
All MAX812TEUS 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 MAX812TEUS meets industry standards.
7.What is the process for return or replacement of MAX812TEUS?
All MAX812TEUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX812TEUS, 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 MAX812TEUS part is unused and in its original packaging.
Return procedure for MAX812TEUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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