Analog Devices Inc./Maxim Integrated MAX6455UT26S+

Overview

MAX6455UT26S+ from Maxim Integrated is a dual-output microprocessor supervisor IC with separate VCC reset and manual reset outputs, designed for soft-system interrupt (MROUT) and hard-system reboot (RESET) functions. It monitors VCC at 2.625V ±1.5% threshold and an adjustable secondary voltage down to 0.63V via RSTIN, features 140ms minimum reset timeout, 6µA supply current, and operates over -40°C to +85°C in SOT23-6 package for embedded power sequencing in consumer electronics and industrial equipment.

For engineers reviewing the MAX6455UT26S+ datasheet, MAX6455UT26S+ pinout, MAX6455UT26S+ application, or MAX6455UT26S+ equivalent, key selection criteria include its dual active-low push-pull outputs, MR-controlled extended setup period (3.36s typ), guaranteed valid reset down to VCC = 1.0V, immunity to ≤20µs transients at 100mV overdrive, and compatibility with 1.5V–5.5V system rails.

Technical Context

The MAX6455UT26S+ implements a precision bandgap-based voltage monitor for VCC with factory-set 2.625V threshold and ±60ppm/°C tempco, plus a high-impedance (±25nA) comparator on RSTIN referenced to 0.63V. Its MR input controls both MROUT and RESET outputs: short MR assertion triggers only MROUT (soft interrupt), while MR held low ≥3.36s asserts both outputs for full system reset.

This dual-mode behavior enables interrupt-before-reset functionality in resource-constrained systems. The device guarantees proper output logic state for VCC ≥1.0V and supports open-drain or push-pull configurations - though MAX6455 variants use push-pull outputs per Pin Description table and Selector Guide.

Key Specifications

Pinout & Package

Package: SOT23-6, surface-mount, RoHS-compliant (indicated by '+' suffix), 2.9mm × 1.6mm footprint with 0.95mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6453UT26S+, the MAX6455UT26S+ adds MR-controlled RESET assertion enabling unified pushbutton interface, while TPS3808G33DBVR trades dual outputs and adjustability for lower quiescent current and simpler integration in single-supply systems.

Availability

MAX6455UT26S+ is available at Aetrix Electronics and suitable for set-top box manufacturing, industrial PLC development, medical infusion pump production, automotive telematics design, and consumer electronics requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6455UT26S+ 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 and mixed-signal ICs for power management, sensing, and connectivity applications.

The MAX6453–MAX6456 family delivers dual-output µP supervision with configurable reset thresholds and manual reset logic, targeting space-constrained embedded systems needing robust power-up/power-down sequencing and fault recovery.

FAQ

What is the factory-set VCC reset threshold voltage for MAX6455UT26S+?

The MAX6455UT26S+ has a factory-set VCC reset threshold of 2.625V ±1.5%, corresponding to the '26' suffix in the part number per Table 1. This value is laser-trimmed during production and remains stable over temperature (±60ppm/°C). The threshold applies specifically to the VCC pin and is used to detect brownout conditions on the primary supply rail monitored by the MAX6455UT26S+.

How does the manual reset (MR) input function on MAX6455UT26S+ compared to MAX6453UT26S+?

On the MAX6455UT26S+, the MR input controls both MROUT and RESET outputs: a short low pulse asserts only MROUT, while holding MR low for ≥3.36s asserts both outputs. In contrast, MAX6453UT26S+ MR affects only MROUT - RESET remains fully autonomous. This dual-control behavior is intrinsic to the MAX6455UT26S+ silicon design and enables single-button interrupt-before-reset functionality not possible with MAX6453UT26S+.

Can MAX6455UT26S+ monitor a 1.5V supply using the RSTIN pin?

Yes, the MAX6455UT26S+ can monitor a 1.5V supply via RSTIN using an external resistor divider. With RSTIN's 0.63V threshold, a standard solution uses R2 = 250kΩ and calculates R1 = R2 × (1.5V / 0.63V − 1) ≈ 345kΩ. This configuration allows precise 1.5V brownout detection independent of the 2.625V VCC threshold, and the MAX6455UT26S+ guarantees RSTIN input current within ±25nA across temperature.

What is the minimum VCC voltage at which MAX6455UT26S+ guarantees valid RESET output logic?

The MAX6455UT26S+ guarantees valid RESET output logic down to VCC = 1.0V, as specified in the Electrical Characteristics table. Below this voltage, current-sinking capability degrades and output state becomes indeterminate. For applications requiring valid reset signaling down to 0V, a 100kΩ pulldown resistor must be added between RESET and GND - a design option explicitly supported for push-pull outputs like those on the MAX6455UT26S+.

Does MAX6455UT26S+ support open-drain or push-pull reset outputs?

The MAX6455UT26S+ features active-low push-pull RESET and MROUT outputs, as confirmed by the Selector Guide (Table 3 shows MAX6455 with "✓" under "MROUT and RESET PUSH-PULL OUTPUT") and Pin Description (states "Active-Low Push-Pull or Open-Drain Output" with functional description matching push-pull behavior). This eliminates the need for external pullup resistors and simplifies interface to CMOS inputs, distinguishing it from open-drain variants like MAX6456UT26S+.