Analog Devices Inc./Maxim Integrated MAX807NEUE

Overview

MAX807NEUE from Maxim Integrated is a full-featured microprocessor supervisory circuit designed for critical power monitoring in 5V µP systems. It provides ±1.5% accurate 4.575V reset threshold, active-low and active-high RESET outputs, independent watchdog timer (1.6s timeout), 200ms reset timeout delay, and battery-switchover capability supporting up to 250mA from VCC or 20mA from backup battery - enabling reliable operation in portable instrumentation and industrial controllers.

For engineers reviewing the MAX807NEUE datasheet, MAX807NEUE pinout, MAX807NEUE application, or MAX807NEUE equivalent, this page delivers verified functional specifications, validated pin-level circuit roles, confirmed timing behavior (2ns CE propagation, 200ms reset hold), and real-world substitution guidance for µP reset and power-fail monitoring designs.

Technical Context

The MAX807NEUE integrates seven comparator-based monitoring functions: precision reset detection (4.575V ±1.5%), low-line warning (52mV above reset threshold), power-fail input (2.265V PFI threshold), BATT OK status (2.265V VBOK), and independent watchdog with 1.6s timeout. Its BiCMOS process enables 70µA supply current in normal mode and 1µA standby in battery-backup mode while guaranteeing RESET validity down to VCC = 1V.

It implements dual-path power switching: VCC-to-OUT (1.2Ω typical on-resistance) and BATT-to-OUT (8.5Ω typical), with automatic switchover when VCC falls below VBATT. The chip-enable gating function features 2ns propagation delay and 75Ω series resistance, supporting high-speed µP interface integrity during brownout events.

Key Specifications

Pinout & Package

MAX807NEUE is supplied in 16-pin TSSOP package (JEDEC MO-153, 5mm × 4.4mm, 0.65mm pitch), optimized for space-constrained embedded designs with thermal performance suitable for industrial temperature range (-40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX807NEUE, MAX809SEUS+T omits all advanced supervision features (watchdog, battery management, CE gating), while TPS3823MPDBVR retains watchdog capability but removes the critical low-line comparator and automatic battery switchover-making neither a drop-in replacement for full-featured µP supervision.

Availability

MAX807NEUE is available at Aetrix Electronics and suitable for industrial controller power monitoring, portable medical instrumentation, intelligent energy metering, and critical µP-based test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX807NEUE 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) is a semiconductor leader specializing in high-precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX807 family was engineered specifically for µP systems needing comprehensive power supervision - integrating reset, watchdog, battery switchover, and power-fail warning in a single 16-pin package to reduce board area and improve system reliability.

FAQ

What is the exact reset threshold voltage for MAX807NEUE?

The MAX807NEUE has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature, meaning the actual trip point falls between 4.500V and 4.650V. This value is laser-trimmed during production and specified under VCC = 4.50V to 5.5V conditions. The MAX807NEUE datasheet confirms this threshold applies across its full operating temperature range of -40°C to +85°C.

Does MAX807NEUE support battery backup for CMOS RAM, and what are the current limits?

Yes, MAX807NEUE provides automatic battery switchover to preserve CMOS RAM during main supply failure. In battery-backup mode (VCC = 0V), it delivers up to 20mA from the BATT input to the OUT pin with 8.5Ω typical on-resistance. The device guarantees BATT OK flag assertion when VBATT exceeds 2.265V, and supports batteries from 2.0V to 6V - making MAX807NEUE suitable for lithium coin cells and rechargeable backup sources.

How does the watchdog timer in MAX807NEUE operate, and what is its timeout period?

The MAX807NEUE watchdog timer asserts WDO low if the WDI input remains static (high or low) for longer than 1.6 seconds (typical). A rising or falling edge on WDI clears the timer and returns WDO high, provided RESET is deasserted. When WDI is left unconnected, an internal 1.8V bias disables the watchdog. This behavior is fully documented in the MAX807NEUE electrical characteristics table and timing diagrams.

Can MAX807NEUE be used with non-5V power supplies, and which thresholds are adjustable?

MAX807NEUE's primary reset threshold (4.575V) is fixed, but its PFI input accepts external resistor dividers to monitor supplies other than +5V - for example, a 3.3V or 12V rail. The PFI threshold is 2.265V, so scaling resistors set the trip point for any input voltage. The low-line comparator (52mV above reset) and BATT OK (2.265V) thresholds are also fixed, but MAX807NEUE's architecture allows flexible adaptation to diverse supply architectures.

What package type and pin count does MAX807NEUE use, and is it RoHS compliant?

MAX807NEUE is supplied in a 16-pin TSSOP package (MO-153) measuring 5mm × 4.4mm with 0.65mm lead pitch. It is RoHS compliant and halogen-free per Maxim Integrated's standard environmental specifications. The TSSOP variant offers improved thermal performance over DIP/SO options and is qualified for industrial temperature operation (-40°C to +85°C), as confirmed in the MAX807NEUE ordering information section.