Analog Devices Inc./Maxim Integrated MAX6830WIUT

Overview

MAX6830WIUT from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) and secondary supply (VCC2) with factory-trimmed 1.575V reset threshold for VCC and 0.788V for VCC2, push-pull active-high RESET output, manual reset input (MR), and 1.6s watchdog timeout - used in battery-powered embedded controllers requiring reliable brownout and watchdog protection.

For engineers reviewing the MAX6830WIUT datasheet, MAX6830WIUT pinout, MAX6830WIUT application, or MAX6830WIUT equivalent, this page delivers verified electrical thresholds, timing behavior, reset assertion logic, watchdog interaction, and real-world multivoltage system integration guidance - all specific to the MAX6830WIUT variant with W/V suffixes and UT-T packaging.

Technical Context

The MAX6830WIUT implements dual independent voltage monitoring: VCC (primary) with 1.575V ±0.045V threshold and VCC2 (secondary) with 0.788V ±0.027V threshold, both guaranteed functional down to VCC = +1.0V. Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within timeout.

It features push-pull active-high RESET output with VOH ≥ 0.8×VCC (ISOURCE = 800µA) and VOL ≤ 0.3V (ISINK = 3.2mA at VCC ≥ 4.25V), 140ms minimum reset timeout delay, and MR with internal 50kΩ pullup - enabling direct switch-to-GND manual reset without external components.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6, surface-mount, lead-free compatible (UT-T suffix), 1.6mm × 2.9mm footprint, 1.1mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6827WIUT, the MAX6830WIUT's active-high RESET simplifies interface to modern MCUs with native high-active reset pins; compared with TPS3808G15DBVR, it adds essential dual-rail coverage and watchdog capability for safety-critical embedded designs.

Availability

MAX6830WIUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6830WIUT 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 computing applications.

The MAX6826–MAX6831 family was engineered specifically for multivoltage microprocessor systems needing simultaneous core/I/O rail supervision, manual reset, and watchdog timer - all in ultra-small SOT23-6 footprint.

FAQ

What is the exact VCC2 reset threshold voltage for MAX6830WIUT?

The MAX6830WIUT has a factory-trimmed VCC2 reset threshold of 0.788V ±0.027V over -40°C to +125°C. This value is fixed per the "V" suffix in the ordering code and applies specifically to the VCC2 pin (Pin 5), enabling reliable monitoring of 0.9V I/O supplies without external resistors. The MAX6830WIUT datasheet specifies this threshold in the Electrical Characteristics table under VTH2 parameter.

Does MAX6830WIUT support active-high or active-low reset output?

The MAX6830WIUT provides an active-high push-pull RESET output (Pin 1). When a fault condition occurs - such as VCC or VCC2 falling below threshold, MR pulled low, or WDI timeout - the RESET pin drives high. It returns low after the 140ms timeout expires and all monitored voltages exceed their thresholds. This matches µPs like STM32L4 or NXP Kinetis that accept active-high reset signals directly.

Can MAX6830WIUT monitor a 1.2V supply as VCC2?

No - the MAX6830WIUT's VCC2 pin is factory-trimmed to 0.788V and is intended for monitoring supplies in the +0.9V to +2.5V range, such as 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, or 3.3V rails. While 1.2V exceeds the 0.788V threshold, the device will assert reset only if VCC2 falls *below* 0.788V. To supervise a 1.2V rail, use a resistor divider to scale it down to ~0.788V - but note that MAX6830WIUT lacks the adjustable RESET IN pin (present only on MAX6826–MAX6828).

What is the watchdog timeout period for MAX6830WIUT, and how is it cleared?

The MAX6830WIUT features a nominal 1.6s watchdog timeout period, with ±25% variation over temperature. The internal timer is cleared on any rising or falling edge at the WDI pin (Pin 4). It is also automatically cleared whenever RESET is asserted (by any cause) or MR is pulled low. If WDI remains static beyond 1.6s, the device asserts RESET for the full 140ms timeout period - ensuring recovery from software hangs.

Is MAX6830WIUT compatible with 1.8V VCC operation?

Yes - the MAX6830WIUT operates with VCC from +1.2V to +5.5V and guarantees valid reset assertion down to VCC = +1.0V. At 1.8V VCC, its VCC reset threshold remains 1.575V ±0.045V, providing 225mV of hysteresis margin. The device draws ≤30µA supply current at full temperature range, making it ideal for 1.8V battery-backed systems where low quiescent current is critical for longevity.