Analog Devices Inc./Maxim Integrated MAX800MEUE+

Overview

MAX800MEUE+ from Maxim Integrated is a microprocessor supervisory circuit with dual reset outputs (active-low RESET and active-high RESET), 4.4V typical reset threshold, ±2% power-fail accuracy, and integrated chip-enable gating. It monitors VCC for brownout detection, provides battery switchover down to 1V VCC, and supports watchdog timeout periods of 100ms or 1.6s. Used in industrial controllers requiring reliable power-up sequencing and nonvolatile memory write protection.

For engineers reviewing the MAX800MEUE+ datasheet, MAX800MEUE+ pinout, MAX800MEUE+ application, or MAX800MEUE+ equivalent, this page delivers verified technical context, validated pin functions, confirmed timing behavior under power-fail conditions, and real-world substitution guidance - all grounded in Maxim's official electrical characteristics and functional descriptions.

Technical Context

The MAX800MEUE+ implements dual independent reset outputs (RESET and RESET) with guaranteed assertion down to VCC = +1V, using a precision voltage comparator with 15mV hysteresis. Its internal oscillator or external capacitor/clock at OSC IN sets both reset timeout (200ms typ) and watchdog periods (100ms/1.6s selectable).

It integrates bidirectional CE signal gating with ≤10ns propagation delay and 75Ω on-resistance, plus a dedicated power-fail comparator (PFI/PFO) with 1.25V threshold and 25µs response time. Battery switchover activates when VCC falls below VBATT − 0.3V, enabling seamless backup supply handoff without system interruption.

Key Specifications

Pinout & Package

MAX800MEUE+ is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch), RoHS-compliant and lead-free (indicated by '+' suffix). Pin layout matches industry-standard 16-TSSOP footprint with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX800MEUE+, MAX803SEUR+T omits critical features like CE gating and watchdog, limiting use to simple reset-only systems; TPS3808G33DBVR offers threshold flexibility but requires added circuitry for battery switchover and power-fail monitoring - making MAX800MEUE+ the only single-chip solution covering full supervisory, memory protection, and predictive power-loss functions.

Availability

MAX800MEUE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, smart energy meters, and critical μP power monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX800MEUE+ 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 demanding industrial, automotive, and communications applications.

The MAX800M family targets microprocessor-based systems needing comprehensive power supervision - integrating reset generation, watchdog monitoring, memory write protection, and predictive power-fail detection in one compact package.

FAQ

What is the operating temperature range for MAX800MEUE+?

The MAX800MEUE+ is rated for -40°C to +85°C ambient operation, matching the MAX800_E_ _ grade designation per Maxim's ordering information. This extended industrial temperature range ensures reliable performance in harsh environments such as factory automation cabinets or outdoor telecom enclosures where thermal cycling occurs. The device's electrical characteristics - including reset threshold accuracy, CE propagation delay, and supply current - are fully specified across this full range.

Does MAX800MEUE+ support battery switchover with supercapacitors?

Yes, MAX800MEUE+ explicitly supports MaxCap® and SuperCap-compatible backup sources per its datasheet Features section. Its VBATT input handles up to 25mA continuous current and 250mA peak, with 15–30Ω on-resistance enabling efficient charge/discharge into large-value capacitors (e.g., 0.47F). The switchover comparator activates when VCC falls below VBATT − 0.3V, ensuring seamless transition without software intervention or external FETs.

How does the watchdog function behave when WDI is left unconnected on MAX800MEUE+?

When WDI is left unconnected on MAX800MEUE+, an internal 100kΩ-equivalent resistor network biases it to ~1.6V, placing it in the "mid-supply" three-level state that disables the watchdog timer. WDO remains high, and no reset pulses are generated. This behavior is confirmed in the Detailed Description section: "Leaving WDI unconnected disables the watchdog function." No external pull-up or pull-down is required for safe default operation.

Can MAX800MEUE+ drive CMOS RAM write-protection directly?

Yes, MAX800MEUE+ provides dedicated hardware write protection via its CE IN/CE OUT gating function. When reset is asserted, CE OUT is forced high (pulled to VOUT), blocking all chip-enable transitions to CMOS RAM or EEPROM. This prevents erroneous writes during power-up, brownout, or watchdog timeout - a key requirement for data integrity in systems like energy meters or medical devices where memory corruption is unacceptable.

What is the guaranteed minimum reset pulse width for MAX800MEUE+ on power-up?

The MAX800MEUE+ guarantees a minimum reset pulse width of 140ms and a typical value of 200ms after VCC rises above the 4.4V reset threshold, per the Electrical Characteristics table. This internal oscillator-based timeout ensures sufficient hold time for 5V regulators, crystal oscillators, and μP internal state machines to stabilize before release - meeting JEDEC JESD78 reliability requirements for supervised power-up sequences.