Analog Devices Inc./Maxim Integrated MAX6830SHUT

Overview

MAX6830SHUT 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 thresholds, manual reset input (MR), and watchdog timer (WDI). It asserts an active-high push-pull RESET output when either supply drops below its threshold, MR is pulled low, or WDI times out (1.6s nominal), maintaining reset for ≥140ms after recovery. Designed for multivoltage embedded systems requiring guaranteed reset validity down to VCC = +1.0V.

For engineers reviewing the MAX6830SHUT datasheet, MAX6830SHUT pinout, MAX6830SHUT application, or MAX6830SHUT equivalent, key selection criteria include its dual-supply monitoring capability (VCC: +1.8V to +5.0V; VCC2: +0.9V to +2.5V), push-pull active-high RESET output, 140ms minimum reset timeout, 1.6s watchdog period, and operation across –40°C to +125°C industrial temperature range.

Technical Context

The MAX6830SHUT integrates two independent voltage comparators-one for VCC and one for VCC2-with factory-trimmed thresholds (VCC threshold = 2.93V ±3%, VCC2 threshold = 1.313V ±3% per SH suffix), a 1.6s watchdog timer cleared by WDI edges, and a manual reset input with internal 50kΩ pullup. Its push-pull active-high RESET output drives high during normal operation and pulls low only during reset assertion.

Reset assertion occurs on VCC/VCC2 undervoltage, MR low, or WDI timeout; reset remains asserted for ≥140ms after all conditions clear. The device guarantees valid RESET state down to VCC = +1.0V and exhibits immunity to negative VCC transients ≤20µs at 100mV overdrive, enabling robust operation in noisy power environments.

Key Specifications

Pinout & Package

SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead-free option available (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6827SHUT, the MAX6830SHUT uses identical silicon and specifications but follows Maxim's RESET/RESET naming convention for active-high outputs; versus TPS3808G125DBVR, it adds critical dual-supply monitoring and watchdog capability at the cost of higher integration complexity.

Availability

MAX6830SHUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and automotive systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6830SHUT 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 company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6826–MAX6831 family was designed specifically for ultra-low-voltage dual-supply microprocessor supervision in space-constrained, multirail systems-emphasizing guaranteed operation down to VCC = +1.0V and factory-trimmed accuracy for minimal external component count.

FAQ

What is the VCC2 threshold voltage for MAX6830SHUT?

The MAX6830SHUT has a factory-trimmed VCC2 threshold of 1.313V (minimum 1.268V, maximum 1.358V over –40°C to +125°C), optimized for monitoring 1.2V–1.3V core supplies. This value is fixed by the "H" suffix in the part number and does not require external resistor networks. The MAX6830SHUT uses this dedicated VCC2 pin instead of the adjustable RESET IN input found on MAX6826–MAX6828 variants.

Does MAX6830SHUT support active-low reset output?

No, the MAX6830SHUT provides an active-high push-pull RESET output only. It belongs to the MAX6827/MAX6830 subgroup, which asserts RESET high during normal operation and drives it low during reset. For active-low push-pull output, engineers should select MAX6826/MAX6829 (RESET) or MAX6828/MAX6831 (open-drain RESET). The MAX6830SHUT pinout and function are incompatible with active-low reset signaling without external inversion.

How does the watchdog timer in MAX6830SHUT operate?

The MAX6830SHUT watchdog timer has a nominal 1.6s timeout period (0.80s–2.60s over temperature) and is cleared by any rising or falling edge on the WDI pin. If WDI remains static beyond this period, RESET is asserted for ≥140ms. The timer resets automatically during active reset, manual reset, or WDI transitions. Leaving WDI unconnected disables the watchdog, as the internal driver cycles low-high-low every ~1.4s, preventing timeout.

Can MAX6830SHUT monitor a 1.8V supply as VCC2?

No, the MAX6830SHUT's VCC2 input is factory-trimmed to 1.313V and is specified for monitoring voltages from +0.9V to +2.5V-but its internal comparator threshold is fixed. To monitor a 1.8V rail, a different variant such as MAX6830SVT (VCC2 = 1.8V threshold) or MAX6828 with adjustable RESET IN would be required. The MAX6830SHUT's "H" suffix explicitly denotes the 1.313V VCC2 threshold and cannot be reconfigured.

What is the minimum VCC voltage at which MAX6830SHUT guarantees valid reset operation?

The MAX6830SHUT guarantees valid reset assertion and deassertion down to VCC = +1.0V across the full –40°C to +125°C temperature range. Below this voltage, the internal comparators and output driver may not function deterministically. This specification enables reliable operation during severe brownout conditions where other supervisors fail, making the MAX6830SHUT suitable for battery-backed systems approaching end-of-life voltage.