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Analog Devices Inc./Maxim Integrated MAX812LEUS-T
- Part No.:
- MAX812LEUS-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812LEUS-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
The MAX812LEUS-T from Maxim Integrated is an active-high microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 5V power supplies with a precision 4.63V reset threshold. It asserts RESET when VCC drops below threshold, maintains reset for ≥140ms after recovery, and features a debounced manual reset input (MR) and 6µA supply current. It is used in industrial controllers and portable equipment requiring reliable power-on reset.
For engineers reviewing the MAX812LEUS-T datasheet, MAX812LEUS-T pinout, MAX812LEUS-T application, or MAX812LEUS-T equivalent, key selection criteria include reset polarity (active-high), guaranteed operation down to VCC = 1V for MR logic, transient immunity against ≤40µs/125mV VCC glitches, and compatibility with TTL/CMOS-level manual reset inputs.
Technical Context
The MAX812LEUS-T implements a precision bandgap-based voltage comparator with internal hysteresis and a monostable timeout circuit. Its reset assertion is triggered solely by VCC falling below 4.63V (±1.5% over temperature), and it guarantees RESET remains high during brownout recovery for ≥140ms (tRP).
It integrates a 20kΩ internal pull-up on MR, accepts logic-low manual reset pulses ≥10µs wide, and provides glitch immunity via comparator overdrive tolerance-rejecting transients ≤40µs at 125mV underdrive for L/M versions. No external components are required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±1.5% (ensures reset before 5V ±5% supply falls outside system IC operating range) |
| Reset Timeout (tRP) | ≥140ms (guarantees µP initialization completes before release) |
| Supply Current | 6µA at +25°C (enables multi-year battery life in portable systems) |
| VCC Operating Range | 1.0V to 5.5V (supports valid MR input and RESET output down to 1V) |
| MR Input Threshold | VIL = 0.25×VCC, VIH = 0.7×VCC (TTL/CMOS-compatible with internal 20kΩ pull-up) |
| RESET Output Drive | VOH ≥0.8×VCC @ ISOURCE = 150µA; VOL ≤0.4V @ ISINK = 3.2mA (drives standard CMOS/TTL loads) |
| Tempco | 30ppm/°C (maintains threshold accuracy across -40°C to +85°C) |
Pinout & Package
Package: 4-pin SOT143 (1.75mm × 2.0mm × 0.95mm body height), surface-mount, lead-free compatible (suffix +T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Power rail monitoring point; operates from 1.0V to 5.5V; powers internal comparator and timer |
| 2 (MR) | Manual reset input | Active-low; internally pulled up to VCC (20kΩ); initiates reset when pulled ≤0.25×VCC |
| 3 (RESET) | Active-high reset output | Open-drain compatible; drives high when VCC > 4.63V and MR is high; holds high for ≥140ms after recovery |
| 4 (GND) | Ground reference | Return path for VCC, MR, and RESET; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V threshold | Pre-trimmed ±1.5% accuracy over -40°C to +85°C ensures deterministic reset timing in 5V systems |
| 140ms minimum reset timeout | Guaranteed hold time eliminates need for external RC timing networks in µP boot sequencing |
| 6µA quiescent current | Enables use in always-on battery-backed systems without measurable drain impact |
| MR debounce & glitch immunity | No external capacitor needed; rejects <100ns noise spikes and supports momentary switch interfaces directly |
| Valid operation down to VCC = 1V | Ensures MR input remains functional and RESET output state is defined even during deep brownout |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered from regulated 5V rails subject to intermittent load switching and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M4 microcontrollers during undervoltage events. Use Value: Prevents firmware corruption by holding reset until VCC stabilizes above 4.63V and sustains ≥140ms clean power. | Use Scenario: Handheld glucose meters using coin-cell batteries with aging-induced voltage sag. IC Role / Device Role / Timing Role: Voltage monitor enabling graceful shutdown and nonvolatile memory save before brownout lockup. Use Value: 6µA supply current extends battery life; 4.63V threshold triggers reset before ADC reference drifts beyond clinical accuracy limits. |
| Network Edge Routers | Test & Measurement Equipment |
Use Scenario: Fanless embedded routers with thermally throttled DC-DC converters causing slow VCC ramp-up. IC Role / Device Role / Timing Role: Power-on reset generator ensuring MIPS-based SoC boots only after stable 5V rail is confirmed. Use Value: 140ms tRP accommodates slowest expected VCC rise time; eliminates need for custom reset timing circuits. | Use Scenario: Benchtop oscilloscopes requiring deterministic startup after AC power interruption. IC Role / Device Role / Timing Role: System-level supervisor coordinating FPGA configuration, ADC calibration, and display initialization. Use Value: Active-high RESET simplifies interface to Xilinx Spartan-6 FPGA's PROG_B pin; MR allows front-panel hard-reset button. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812MEUS-T | 4.38V reset threshold (vs. 4.63V); identical pinout, timing, and electrical specs otherwise | Suitable for 5V ±10% supplies or systems with tighter VCC regulation margins | Select when system brownout detection must occur earlier than 4.63V, e.g., before analog front-end ICs lose specification |
| TPS3808G15DBVR | Active-high output, 4.63V threshold, but requires external pull-up on RESET; 1.8µA typical ICC vs. 6µA | Lower quiescent current ideal for ultra-low-power designs; no internal MR pull-up - external resistor required | Choose for battery-critical applications where 1.8µA vs. 6µA matters; accept added BOM component and layout complexity |
Compared with MAX812MEUS-T, the MAX812LEUS-T triggers reset at a higher threshold for earlier intervention in marginal 5V rails; versus TPS3808G15DBVR, it offers integrated MR pull-up and simpler board design at the cost of higher supply current.
Availability
MAX812LEUS-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and network edge routers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX812LEUS-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, and communications markets.
The MAX811/MAX812 product line delivers ultra-low-power, single-function voltage supervisors optimized for deterministic reset timing in space-constrained µP systems with strict reliability requirements.
FAQ
What is the reset threshold voltage of the MAX812LEUS-T?
The MAX812LEUS-T has a nominal reset threshold voltage of 4.63V, with guaranteed accuracy of ±1.5% over the full operating temperature range (-40°C to +85°C). This value is factory-trimmed and specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the official MAX811/MAX812 datasheet. The 'L' suffix explicitly denotes the 4.63V variant, and the threshold remains stable with a tempco of 30ppm/°C.
Does the MAX812LEUS-T provide an active-high or active-low reset output?
The MAX812LEUS-T provides an active-high RESET output, meaning the signal is driven high when VCC is above the 4.63V threshold and MR is not asserted. This distinguishes it from the MAX811 series, which outputs active-low. The MAX812LEUS-T's RESET pin is open-drain compatible and can source up to 150µA while maintaining VOH ≥0.8×VCC.
What is the minimum pulse width required on the MR input to trigger a reset on the MAX812LEUS-T?
The MAX812LEUS-T requires a minimum MR pulse width of 10µs to reliably initiate a reset. The device incorporates internal filtering that rejects shorter noise spikes, and its MR input features a 20kΩ internal pull-up resistor. When MR is pulled low, RESET asserts immediately and remains high for the full Reset Active Timeout Period (tRP) of ≥140ms after MR returns high.
Can the MAX812LEUS-T operate with supply voltages below 5V?
Yes, the MAX812LEUS-T operates over a VCC range of 1.0V to 5.5V. While it is optimized for 5V systems (as indicated by the 4.63V threshold), its internal circuitry remains functional down to 1.0V-ensuring MR input logic levels and RESET output state remain valid during deep brownout conditions. However, RESET output drive strength degrades below 2.5V.
Is external decoupling required for stable operation of the MAX812LEUS-T?
A 0.1µF ceramic capacitor placed as close as possible between VCC and GND is strongly recommended for stable operation of the MAX812LEUS-T. This capacitor suppresses high-frequency noise on the supply rail and enhances immunity to fast negative-going VCC transients (glitches). Without it, the device may misinterpret noise as a brownout event, especially in electrically noisy environments or when connected to long PCB traces.
MAX812LEUS-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:
- 4.63V
- 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-143-4
MAX812LEUS-T FAQ
1.How can I place an order for MAX812LEUS-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812LEUS-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 MAX812LEUS-T reliable?
The price and inventory of MAX812LEUS-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812LEUS-T is usually 5 days.
3.What payment methods are accepted for MAX812LEUS-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812LEUS-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812LEUS-T?
MAX812LEUS-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812LEUS-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 MAX812LEUS-T?
For technical support, including MAX812LEUS-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812LEUS-T requirements.
6.How does Aetrix verify that MAX812LEUS-T is sourced from the original manufacturer or authorized distributors?
All MAX812LEUS-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 MAX812LEUS-T meets industry standards.
7.What is the process for return or replacement of MAX812LEUS-T?
All MAX812LEUS-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX812LEUS-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 MAX812LEUS-T part is unused and in its original packaging.
Return procedure for MAX812LEUS-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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