Analog Devices Inc./Maxim Integrated MAX6359RVUT

Overview

MAX6359RVUT from Maxim Integrated is a dual-voltage microprocessor supervisory IC with push-pull active-low reset referenced to VCC1, factory-set VCC1 threshold of 2.63V and VCC2 threshold of 1.58V, 20µA supply current, 100ms min reset pulse width, and integrated watchdog timer featuring 46.4s startup timeout and 2.9s normal timeout - used in multivoltage embedded systems requiring reliable power-on and runtime supervision.

For engineers reviewing the MAX6359RVUT datasheet, MAX6359RVUT pinout, MAX6359RVUT application, or MAX6359RVUT equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative options for dual-supply reset and watchdog supervision in industrial and portable electronics.

Technical Context

The MAX6359RVUT monitors two independent supply rails (VCC1 and VCC2), asserting its single active-low push-pull RST output when either falls below its precision threshold (2.63V/1.58V). Reset remains valid as long as either supply stays ≥1.0V, enabling robust brownout detection across asymmetric voltage domains.

It integrates a dual-mode watchdog timer: a 46.4s startup timeout allows full system initialization after power-up or manual reset, followed by a 2.9s normal timeout that requires periodic WDI edge transitions to prevent reset - supporting both boot-critical and runtime fault-detection requirements.

Key Specifications

Pinout & Package

MAX6359RVUT is housed in a 6-pin SOT23 package (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, 1.1mm max height, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with MAX6359RVUT, MAX6359RUVT offers a higher VCC1 threshold for 2.8V systems but identical functionality, while TPS3808G33DBVR provides basic 3.3V supervision only - making MAX6359RVUT uniquely suited for compact, low-power dual-rail designs requiring integrated watchdog enforcement.

Availability

MAX6359RVUT is available at Aetrix Electronics and suitable for industrial control, portable medical devices, automotive infotainment, and network infrastructure requiring stable component supply, guaranteed long-term availability, and full temperature-range compliance.

Supply support for MAX6359RVUT 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, communications, and consumer applications.

The MAX6351–MAX6360 family was designed specifically for multivoltage microprocessor supervision - delivering precision dual-threshold monitoring, ultra-low power consumption, and integrated watchdog functionality in minimal SOT23 packages.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6359RVUT?

The MAX6359RVUT has a factory-set VCC1 reset threshold of 2.63V (±0.05V) and VCC2 reset threshold of 1.58V (±0.05V), as defined by the "RV" suffix per Maxim's Voltage Threshold Levels table. These values are laser-trimmed during production and guaranteed over the full -40°C to +85°C operating range. The MAX6359RVUT uses these precise thresholds to assert its active-low RST output when either supply falls below its respective trip point.

Does the MAX6359RVUT require external components to operate?

No, the MAX6359RVUT operates autonomously with no external components required. Its precision thresholds are factory-trimmed, the MR input includes an internal 32–100kΩ pull-up to VCC1, and the RST output is push-pull - eliminating the need for external pull-ups, timing capacitors, or voltage dividers. This enables direct drop-in use in dual-supply systems, reducing BOM cost and PCB area versus discrete solutions.

How does the watchdog timer function on the MAX6359RVUT?

The MAX6359RVUT implements a dual-mode watchdog timer: after any reset event (power-up, MR, or watchdog timeout), it enters a 46.4s startup timeout period to allow full system initialization; then transitions to a 2.9s normal timeout mode requiring periodic WDI edge transitions. If WDI remains static beyond the active timeout, MAX6359RVUT asserts RST for ≥100ms. This architecture prevents false resets during boot while ensuring rapid detection of runtime hangs.

What is the minimum supply voltage at which the MAX6359RVUT guarantees valid reset operation?

The MAX6359RVUT guarantees valid RST output functionality as long as either VCC1 or VCC2 remains ≥1.0V - even if the other supply has collapsed completely. This "reset-valid-to-1V" specification ensures controlled system shutdown and prevents metastability in downstream logic during brownout conditions. The MAX6359RVUT maintains this guarantee across the full -40°C to +85°C temperature range.

Is the MAX6359RVUT pin-compatible with other devices in the MAX6351–MAX6360 family?

Yes, the MAX6359RVUT shares the identical 6-pin SOT23 pinout (RST, GND, MR, VCC2, WDI, VCC1) with all other 6-pin variants in the MAX6351–MAX6360 series, including MAX6358, MAX6360, and MAX6355–MAX6357. However, functional differences exist: MAX6359RVUT provides VCC1-referenced push-pull RST, while MAX6358 offers open-drain RST and MAX6360 provides VCC2-referenced RST. Pin compatibility enables layout reuse, but electrical behavior must be verified per variant.