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Analog Devices Inc./Maxim Integrated MAX812REUS
- Part No.:
- MAX812REUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812REUS.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, FI
- Quantity:
- Payment:
- Shipping:
Inventory:1,451
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Product details
Overview
MAX812REUS from Maxim Integrated is a precision 2.63V active-high microprocessor supervisory circuit in SOT143-4 package, providing power-on reset assertion for ≥140ms, manual reset input with 20kΩ internal pull-up, and guaranteed RESET validity over -40°C to +85°C. It monitors 3V systems in portable equipment, controllers, and intelligent instruments.
For engineers reviewing the MAX812REUS datasheet, MAX812REUS pinout, MAX812REUS application, or MAX812REUS equivalent, this page delivers verified threshold voltage (2.63V), reset timeout (140ms min), supply current (2.7µA typ), MR timing behavior, and SOT143 terminal mapping - all confirmed from Maxim's official datasheet Rev 4 (12/05).
Technical Context
The MAX812REUS implements a dedicated voltage-monitoring comparator with hysteresis-free threshold detection at 2.63V (±1.5% over temperature), coupled to a monostable timer that guarantees ≥140ms reset pulse width after VCC rises above threshold. Its active-high RESET output drives high when VCC > VTH and remains high for tRP = 140–560ms after reset conditions clear.
MR is an active-low manual reset input with 10µs glitch immunity, 10µs minimum pulse width, and internal 20kΩ pull-up; it asserts RESET low while held low and sustains reset for tRP after release. The device draws only 2.7µA typical supply current at +25°C and operates down to VCC = 1V for reliable brownout response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% (R-suffix); ensures reliable reset before 3V system ICs drop below 2.55V min operating voltage |
| Reset Timeout | 140ms min (tRP); guarantees µP initialization completes before code execution begins |
| Supply Current | 2.7µA typ at +25°C; enables multi-year battery life in portable 3V systems |
| MR Input Threshold | VIL = 0.25×VCC, VIH = 0.7×VCC; compatible with TTL/CMOS logic and open-drain switches without external biasing |
| RESET Output Drive | VOH = 0.8×VCC min (ISOURCE = 500µA), VOL = 0.4V max (ISINK = 1.2mA); directly interfaces to 3V µP reset pins |
| Operating Temp | -40°C to +85°C; validated across full range with no derating required for industrial applications |
| Transient Immunity | Rejects ≤20µs negative VCC glitches down to VTH −125mV; eliminates false resets in noisy power environments |
Pinout & Package
SOT143-4 surface-mount package (4.0 × 2.0 × 1.75 mm), lead-free compatible, with gull-wing leads and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND | Ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| 2: VCC | Power supply input | Accepts 1.0V to 6.0V; powers internal comparator, timer, and RESET driver; decoupling capacitor required |
| 3: RESET | Active-high reset output | Drives high during normal operation; goes low only during reset events; sinks 1.2mA max at VCC = 3V |
| 4: MR | Manual reset input | Active-low; internal 20kΩ pull-up allows direct switch-to-GND connection; no external components needed |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated 20kΩ MR pull-up, precision trimmed 2.63V threshold, and monostable timer eliminate discrete R/C networks |
| Guaranteed reset validity to VCC = 1V | RESET output remains functional and correctly asserted even as supply collapses - critical for safe shutdown sequencing |
| Low-power supervision | 2.7µA typical ICC enables use in always-on battery-backed systems without measurable drain impact |
| Brownout immunity with auto-recovery | Internal timer resets on every VCC dip below 2.63V, ensuring reset reassertion without software intervention |
| MR debounced by design | 10µs minimum MR pulse width and 10µs glitch rejection remove need for external RC filters or firmware debounce |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered from 3V rails with intermittent backup battery switchover. IC Role / Device Role / Timing Role: Supervises 3V main supply and asserts active-high RESET to ARM Cortex-M4 during brownout or battery transition. Use Value: Prevents corrupted register writes during voltage sag using 2.63V threshold aligned to 3V ±5% spec, with 140ms timeout ensuring full MCU boot sequence completion. |
Use Scenario: Handheld glucose meters operating from single-cell Li-ion (3.0–4.2V) with sleep-mode current <5µA. IC Role / Device Role / Timing Role: Monitors battery voltage and triggers hardware reset before undervoltage lockout disables analog front-end. Use Value: 2.7µA supply current extends battery life beyond 2 years; 2.63V threshold avoids premature reset during normal discharge curve. |
| Smart Sensor Nodes | POS Terminal Power Management |
Use Scenario: LoRaWAN edge sensor node powered by 3.3V LDO with wake-on-interrupt operation. IC Role / Device Role / Timing Role: Provides deterministic power-on reset and manual reset via pushbutton for field firmware recovery. Use Value: MR input with internal pull-up simplifies PCB layout; 10µs MR glitch immunity prevents accidental reset from ESD transients. |
Use Scenario: Retail point-of-sale terminal with dual 5V/3.3V rails and hot-pluggable peripherals. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail and coordinates reset timing across CPU, display controller, and USB hub. Use Value: Active-high RESET output directly drives multiple 3.3V CMOS inputs without level-shifting; SOT143 footprint minimizes board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | 2.93V fixed threshold, 200ms reset timeout, 1.6µA ICC, SOT-23-5 | Higher threshold unsuitable for 3V systems requiring reset before 2.85V; extra pin adds routing complexity | Select only if 2.93V alignment with 3.3V rail is required and 200ms timeout is acceptable |
| ADM6806-26ARTZ-R7 | 2.63V threshold, 240ms timeout, 3.5µA ICC, SOT-23-4, no MR input | Lacks manual reset functionality; requires external switch circuitry for field recovery | Choose when MR is unnecessary and longer timeout improves noise margin in high-EMI environments |
Compared with TPS3123E18DBVR and ADM6806-26ARTZ-R7, the MAX812REUS uniquely combines 2.63V accuracy, 140ms timeout, integrated MR pull-up, and SOT143-4 compactness - making it optimal for space-constrained 3V portable designs requiring field-serviceable reset.
Availability
MAX812REUS is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart sensor nodes, and POS terminal power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX812REUS 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, and computing applications, with emphasis on reliability and integration.
The MAX811/MAX812 family was engineered specifically for low-power, single-supply microprocessor supervision in battery-operated and space-constrained systems - delivering factory-trimmed thresholds and guaranteed timing without external components.
FAQ
What is the exact reset threshold voltage of the MAX812REUS?
The MAX812REUS has a nominal reset threshold of 2.63V, with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is factory-trimmed and specified in Maxim's datasheet Rev 4 (12/05) Table "ELECTRICAL CHARACTERISTICS" under parameter VTH for suffix R. At +25°C, typical deviation is ±0.05V, ensuring compatibility with 3V ±5% power rails.
Does the MAX812REUS provide manual reset functionality, and how is it implemented?
Yes, the MAX812REUS includes a dedicated MR (manual reset) input on pin 4. It is active-low with an internal 20kΩ pull-up resistor, allowing direct connection to a normally-open pushbutton switch tied to GND. No external components are needed. When MR is pulled low, RESET goes low and remains low for the Reset Active Timeout Period (140–560ms) after MR returns high.
What is the supply current consumption of the MAX812REUS at room temperature?
The MAX812REUS draws 2.7µA typical supply current (ICC) at +25°C and VCC = 3.6V, as measured per Maxim's datasheet Rev 4 Table "ELECTRICAL CHARACTERISTICS". This ultra-low quiescent current enables multi-year operation in battery-powered 3V systems, with maximum ICC of 10µA across the full -40°C to +85°C range.
Can the MAX812REUS operate reliably when VCC drops below 1V?
The MAX812REUS RESET output remains valid and correctly driven down to VCC = 1V, but below that, the output stage becomes high-impedance. For applications requiring RESET validity down to 0V, a 100kΩ pull-up resistor from RESET to VCC is recommended - a design practice explicitly documented in Maxim's "Applications Information" section for the MAX812REUS.
What package type and dimensions does the MAX812REUS use?
The MAX812REUS uses the SOT143-4 package: 4.0mm × 2.0mm × 1.75mm body size with gull-wing leads, compliant with EIA481-1 standard. Pin pitch is 0.95mm, and lead width is 0.45mm. This compact surface-mount outline is confirmed in Maxim's "Package Information" section and drawing 21-0052.
MAX812REUS 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:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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-23-4
MAX812REUS FAQ
1.How can I place an order for MAX812REUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812REUS 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 MAX812REUS reliable?
The price and inventory of MAX812REUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812REUS is usually 5 days.
3.What payment methods are accepted for MAX812REUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812REUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812REUS?
MAX812REUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812REUS 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 MAX812REUS?
For technical support, including MAX812REUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812REUS requirements.
6.How does Aetrix verify that MAX812REUS is sourced from the original manufacturer or authorized distributors?
All MAX812REUS 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 MAX812REUS meets industry standards.
7.What is the process for return or replacement of MAX812REUS?
All MAX812REUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX812REUS, 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 MAX812REUS part is unused and in its original packaging.
Return procedure for MAX812REUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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