Analog Devices Inc./Maxim Integrated MAX6827VUT+

Overview

MAX6827VUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, designed to monitor primary supply (VCC) and user-adjustable secondary input (RESET IN) with push-pull active-high RESET output. It features 140ms minimum reset timeout, 1.6s watchdog timer, manual reset input (MR), and guaranteed operation down to VCC = +1.2V over –40°C to +125°C. Used in portable battery-powered equipment for reliable power-up/power-down sequencing.

For engineers reviewing the MAX6827VUT+ datasheet, MAX6827VUT+ pinout, MAX6827VUT+ application, or MAX6827VUT+ equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use cases in multivoltage embedded systems, and two validated alternative parts with documented functional and application-level differences.

Technical Context

The MAX6827VUT+ integrates dual-supply monitoring with independent threshold detection: VCC monitored at factory-trimmed 1.575V (±3% over –40°C to +125°C), and RESET IN monitored at 0.63V (typ) with user-configurable voltage divider scaling. Its internal watchdog timer clears on any WDI edge and triggers reset if un-toggled beyond 1.6s (min 0.8s, max 2.6s over temperature).

Reset assertion logic combines OR-ed conditions - VCC drop below threshold, RESET IN fall below 0.63V, MR low, or watchdog timeout - with synchronized 140–320ms timeout delay after recovery. The push-pull RESET output sources ≥0.8×VCC at 200µA and sinks ≤0.3V at 1.2mA, supporting direct interface to µP reset inputs without external pullups.

Key Specifications

Pinout & Package

MAX6827VUT+ uses a 6-pin SOT23 package (outline U6+1, land pattern 90-0175), optimized for space-constrained portable and embedded designs. Pin functions are electrically validated per Maxim's official pin description table and functional diagrams.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6826VUT+ and MAX6828VUT+, the MAX6827VUT+ provides active-high push-pull RESET ideal for direct connection to modern µPs with active-high reset inputs, eliminating external components and logic inversion while maintaining identical supervision accuracy and timing behavior.

Availability

MAX6827VUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX6827VUT+ 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, medical, and communications applications.

The MAX6826–MAX6831 family was engineered specifically for dual-rail microprocessor supervision in space- and power-constrained systems, emphasizing ultra-low operating voltage, factory-trimmed accuracy, and integrated watchdog functionality.

FAQ

What is the exact VCC reset threshold voltage for MAX6827VUT+?

The MAX6827VUT+ has a factory-trimmed VCC reset threshold of 1.575V (typical), with guaranteed range of 1.521V to 1.629V over –40°C to +125°C. This value corresponds to the "V" suffix in the MAX6827VUT+ part number and is specified in the Electrical Characteristics table under "VCC Reset Threshold" for the "V" variant. The threshold applies to the primary supply monitored on pin 6 (VCC).

Does MAX6827VUT+ support monitoring a secondary voltage lower than 0.9V?

Yes, the MAX6827VUT+ supports monitoring secondary voltages as low as 0.6V using its RESET IN pin (pin 5). This pin compares the applied voltage against an internal 0.63V (typ) reference. By connecting an external resistor divider between the target voltage and ground, users can scale higher voltages down to meet the 0.63V threshold - enabling precise supervision of sub-0.9V rails like 0.8V or 0.65V core supplies.

What is the function of the WDI pin on MAX6827VUT+ and how is it cleared?

The WDI (Watchdog Input) pin on MAX6827VUT+ clears the internal 1.6s watchdog timer on any detected edge - either rising or falling. If WDI remains static (high or low) beyond the timeout period, a reset is asserted. The timer also clears automatically during active reset or manual reset (MR low). Leaving WDI unconnected disables the watchdog, as the internal driver toggles it every ~1.4s, preventing timeout.

Can MAX6827VUT+ operate reliably at VCC = 1.0V?

No - the MAX6827VUT+ is guaranteed to operate correctly down to VCC = +1.2V over the full –40°C to +125°C temperature range. While the general MAX6826–MAX6831 family guarantees reset validity to +1.0V for some variants, the "V"-suffixed versions (including MAX6827VUT+) specify a minimum VCC of +1.2V in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below +1.2V is outside guaranteed specifications.

How does the RESET output behavior differ between MAX6827VUT+ and MAX6828VUT+?

The MAX6827VUT+ features an active-high push-pull RESET output (pin 1), which actively drives high during normal operation and low during reset - requiring no external pullup. In contrast, MAX6828VUT+ provides an open-drain RESET output, necessitating an external pullup resistor to define the high state. This makes MAX6827VUT+ suitable for direct interface with µPs that accept active-high reset signals, while MAX6828VUT+ supports wired-OR reset buses and bidirectional reset pins.