Analog Devices Inc./Maxim Integrated MAX810REUR+T

Overview

MAX810REUR+T from Maxim Integrated is a 3-pin SOT23 microprocessor supervisory circuit with active-high push-pull RESET output, precision 2.63V reset threshold (±1.5% over −40°C to +105°C), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed RESET validity down to VCC = +1V. It monitors +2.5V/+3.0V/+3.3V/+5V power rails in portable battery-powered systems and automotive control modules.

For engineers reviewing the MAX810REUR+T datasheet, MAX810REUR+T pinout, MAX810REUR+T application, or MAX810REUR+T equivalent, this page delivers verified electrical parameters, package-specific timing behavior, thermal operating limits, real-world transient immunity data, and validated alternative options for reset supervision in space-constrained embedded designs.

Technical Context

The MAX810REUR+T implements a precision bandgap-based voltage comparator with internal hysteresis to detect VCC drops below its 2.63V threshold. Its push-pull output drives high during reset assertion-unlike open-drain MAX803 or active-low MAX809 variants-enabling direct interface with μP reset inputs requiring active-high logic.

Reset timeout is internally generated via RC timing and guaranteed ≥140ms after VCC rises above threshold across −40°C to +105°C. The device ignores transients ≤20μs at 100mV overdrive and maintains valid output state down to VCC = +1V, with leakage <1μA when deasserted.

Key Specifications

Pinout & Package

MAX810REUR+T is housed in a 3-pin SOT23 package (JEDEC MO-178AA), footprint-compatible with industry-standard 3-pin supervisory IC layouts and suitable for reflow soldering per JEDEC J-STD-020D.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with MAX810REUR+T, MAX809REUR+T requires logic inversion in the reset path and lacks compatibility with active-high-only MCUs, while TPS3123E18DBVR offers broader temperature coverage at the cost of higher quiescent current and different supply current vs. temperature profile.

Availability

MAX810REUR+T is available at Aetrix Electronics and suitable for automotive body electronics, portable medical instrumentation, industrial PLC I/O modules, and smart home hub power sequencing requiring stable component supply and long-term lifecycle support.

Supply support for MAX810REUR+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 and mixed-signal ICs for industrial, automotive, communications, and consumer applications.

The MAX810REUR+T belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation, brownout protection, and low-power reliability in resource-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX810REUR+T and how tightly is it specified?

The MAX810REUR+T has a nominal reset threshold of 2.63V, with guaranteed tolerance of ±1.5% over the full operating temperature range of −40°C to +105°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet (Rev 11, p.2), where VTH min/max values are listed as 2.55V/2.70V at −40°C to +85°C and 2.50V/2.76V at −40°C to +125°C. The R-suffix denotes the 2.63V variant across the MAX803/MAX809/MAX810 family.

Does MAX810REUR+T support operation down to 1.2V VCC, and what happens to RESET output below 1V?

Yes, MAX810REUR+T operates with VCC as low as 1.2V over −40°C to +105°C, per Absolute Maximum Ratings and Electrical Characteristics tables. Below VCC = +1V, the RESET output remains valid and actively driven low (deasserted state), but output drive strength diminishes. The datasheet explicitly guarantees RESET validity "to VCC = +1V", meaning no undefined or floating states occur down to that point-critical for controlled shutdown in battery-powered systems.

How does the 140ms reset timeout of MAX810REUR+T behave across temperature, and is it guaranteed minimum?

The 140ms reset timeout is a guaranteed minimum value for MAX810REUR+T across its full temperature range. At −40°C to +85°C, the timeout is specified as 140ms (min) to 460ms (max) for SC70 packages and 140ms (min) to 560ms (max) for SOT23 packages like the MAX810REUR+T. The datasheet confirms this in the "Reset Active Timeout Period (SOT23)" row (p.2), where 140ms is the absolute lower limit under all conditions-including worst-case process, voltage, and temperature corners.

Can MAX810REUR+T replace MAX809REUR+T directly on a PCB, and what is the key functional difference?

No, MAX810REUR+T cannot directly replace MAX809REUR+T without board-level changes because they differ in RESET polarity: MAX810REUR+T has an active-high output, while MAX809REUR+T is active-low. Swapping them would invert reset logic, causing the microprocessor to remain held in reset or fail to initialize. The pinout and package are identical, but the output behavior is fundamentally incompatible-requiring either firmware modification or level-shifting circuitry.

What is the maximum allowable negative VCC transient duration that MAX810REUR+T can ignore without asserting reset?

At 100mV overdrive (i.e., VCC dipping 100mV below the 2.63V threshold), MAX810REUR+T ignores transients ≤20μs, as confirmed in the "Negative-Going VCC Transients" section and Figure 1 (p.4). This immunity is consistent across the MAX803/MAX809/MAX810 family. For larger overdrive magnitudes (e.g., 200mV), the maximum allowable duration decreases proportionally-down to ~5μs-ensuring robust operation in electrically noisy environments like automotive or industrial settings.