Analog Devices Inc./Maxim Integrated MAX810MEXR

Overview

MAX810MEXR from Maxim Integrated is a 3-pin microprocessor supervisory circuit with push-pull active-high RESET output, designed to monitor +4.38V supply rails in embedded systems. It asserts reset when VCC falls below 4.38V and holds it active for ≥140ms after VCC recovers, operates down to VCC = 1V, draws only 12µA typical supply current, and is qualified for -40°C to +125°C operation in SC70-3 package.

For engineers reviewing the MAX810MEXR datasheet, MAX810MEXR pinout, MAX810MEXR application, or MAX810MEXR equivalent, this page delivers verified electrical behavior, thermal specifications, reset timing guarantees, package dimensions, and real-world interfacing guidance - all specific to the MAX810MEXR variant with 4.38V threshold and active-high push-pull output.

Technical Context

The MAX810MEXR implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC droop below its fixed 4.38V threshold. Its internal reset timer ensures a minimum 140ms active timeout after VCC rises above threshold, independent of supply ramp rate.

It features guaranteed logic-state validity down to VCC = 1V, immunity to fast transients (e.g., ≤20µs glitches at 100mV overdrive), and no external components required - enabling direct integration into space-constrained µP power monitoring paths without pull-up or pull-down resistors under standard conditions.

Key Specifications

Pinout & Package

MAX810MEXR is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm), optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809MEXR, MAX810MEXR eliminates need for logic inversion in active-high reset architectures; compared with TPS3808G18DBVR, it offers tighter threshold accuracy (±1.5% vs ±2%), shorter guaranteed timeout (140ms vs 350ms), and higher temperature rating (+125°C vs +85°C), making it preferable for automotive and industrial timing-critical applications.

Availability

MAX810MEXR is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensors, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX810MEXR 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 computing applications.

The MAX810 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power-monitoring in space- and power-constrained embedded systems where deterministic reset behavior is critical.

FAQ

What is the exact reset threshold voltage for MAX810MEXR?

The MAX810MEXR has a factory-trimmed reset threshold of 4.38V, specified with ±1.5% tolerance over the full -40°C to +125°C temperature range. This value is confirmed in the Electrical Characteristics table of the official MAX803/MAX809/MAX810 datasheet (Rev 6, December 2005), and applies specifically to the "M" suffix variant in SC70-3 packaging. The MAX810MEXR maintains this threshold with 30ppm/°C tempco, ensuring minimal drift across operating conditions.

Does MAX810MEXR require an external pull-up resistor on the RESET pin?

No, the MAX810MEXR does not require an external pull-up resistor because it features a push-pull active-high RESET output. Unlike the open-drain MAX803, the MAX810MEXR actively drives high and sinks current when low, enabling direct connection to standard CMOS µP reset inputs. A 100kΩ pull-up is only recommended if RESET validity must be maintained down to VCC = 0V - a rare requirement outside specialized fail-safe designs.

What is the minimum reset pulse width guaranteed by MAX810MEXR?

The MAX810MEXR guarantees a minimum reset pulse width of 140ms after VCC rises above the 4.38V threshold. This specification is tested and guaranteed over temperature (-40°C to +125°C for SC70-3) and applies to both power-up and recovery-from-brownout scenarios. The actual timeout may extend up to 560ms at temperature extremes, but the 140ms minimum ensures µP initialization time is always met per JEDEC and ARM startup guidelines.

Can MAX810MEXR operate reliably when VCC drops below 2.0V?

Yes, the MAX810MEXR is fully specified to operate down to VCC = 1.2V and guarantees correct RESET logic state down to VCC = 1.0V. Below 1.0V, the output enters high-impedance, but for all practical brownout detection purposes - including automotive cold-crank (down to 1.8V) and Li-ion discharge (down to 2.5V) - the MAX810MEXR maintains valid active-high reset assertion. Its internal comparator and timer remain functional throughout this range.

Which package and temperature grade does MAX810MEXR use?

The MAX810MEXR uses the SC70-3 package (2.0mm × 2.1mm × 0.9mm) and is rated for operation from -40°C to +125°C. The "EXR" suffix explicitly denotes the extended temperature SC70 variant, distinct from the "EUR" (SOT23, -40°C to +105°C) versions. This makes MAX810MEXR suitable for under-hood automotive, industrial motor drives, and outdoor infrastructure applications where high-temperature reliability is mandatory.