Analog Devices Inc./Maxim Integrated MAX6455UT16S+

Overview

MAX6455UT16S+ from Maxim Integrated is a dual-output, low-power µP supervisor IC with factory-set 1.575V VCC reset threshold and adjustable RSTIN input (0.63V reference), supporting both soft-system interrupt (MROUT) and hard-system reboot (RESET) via a single manual reset input. It features push-pull active-low outputs, 140ms min reset timeout, 6µA supply current, and operates from 1.0V to 5.5V supply across –40°C to +85°C - used in set-top boxes and industrial equipment for reliable power-on sequencing and brownout recovery.

For engineers reviewing the MAX6455UT16S+ datasheet, MAX6455UT16S+ pinout, MAX6455UT16S+ application, or MAX6455UT16S+ equivalent, this page delivers verified electrical parameters, SOT23-6 package details, timing behavior of MR-controlled dual outputs, and validated alternatives for system-level reset architecture design.

Technical Context

The MAX6455UT16S+ implements a dual-comparator architecture: one precision bandgap-based monitor for VCC (1.575V ±1.5%) and a high-impedance comparator for RSTIN referenced to 0.63V. Its MR input controls both MROUT and RESET outputs - short MR assertion (<3.36s) triggers only MROUT (soft interrupt), while extended MR assertion (≥3.36s) asserts both MROUT and RESET (hard reboot).

This enhanced setup timeout logic enables single-button interrupt-before-reset functionality. The device guarantees valid RESET output down to VCC = 1.0V, supports open-drain or push-pull configurations (this variant uses push-pull), and rejects transients ≤20µs when VCC dips 100mV below threshold.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6455UT16S+, MAX6453UT16S+ offers identical threshold and package but lacks MR-gated RESET functionality, while TPS3808G15DBVR trades adjustable monitoring and dual-output control for lower quiescent current and simpler integration in single-supply systems.

Availability

MAX6455UT16S+ is available at Aetrix Electronics and suitable for set-top box manufacturing, industrial PLC deployment, and medical device production requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6455UT16S+ 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, sensing, and interface applications, with emphasis on reliability and integration for demanding environments.

The MAX6453–MAX6456 family was developed to provide dual-output, low-quiescent-current µP supervision with configurable reset behavior - specifically targeting consumer, industrial, and medical systems needing both interrupt and reboot capabilities from a single compact device.

FAQ

What is the exact VCC reset threshold voltage for MAX6455UT16S+?

The MAX6455UT16S+ has a factory-trimmed VCC reset threshold of 1.575V, with ±1.5% tolerance over –40°C to +85°C. This value is confirmed in Table 1 of the datasheet and corresponds to the "16" suffix in the part number. The threshold is temperature-stable with 60ppm/°C tempco, ensuring consistent performance across operating conditions. MAX6455UT16S+ does not require external calibration or trimming.

How does the manual reset (MR) input control both MROUT and RESET in MAX6455UT16S+?

In MAX6455UT16S+, the MR input controls both outputs via an internal timer: pulling MR low for less than 3.36s (typical) asserts only MROUT; holding MR low for ≥3.36s asserts both MROUT and RESET. After MR is released, both outputs remain low for ≥140ms before deasserting. This dual-mode behavior is intrinsic to the MAX6455/MAX6456 variant and distinguishes MAX6455UT16S+ from MAX6453/MAX6454.

Can MAX6455UT16S+ monitor a 1.2V rail using the RSTIN pin?

Yes, MAX6455UT16S+ can monitor a 1.2V rail using RSTIN by connecting it to the center node of an external resistor divider. With RSTIN's 0.63V internal reference, a 1.2V rail requires R1/R2 ≈ 0.905 (e.g., R2 = 250kΩ, R1 = 226kΩ). The high-impedance RSTIN input (±25nA) minimizes divider current, preserving accuracy and efficiency. This capability is explicitly supported in the datasheet's Applications Information section.

What is the minimum VCC voltage at which MAX6455UT16S+ guarantees valid RESET output logic?

MAX6455UT16S+ guarantees valid RESET output logic down to VCC = 1.0V, as specified in the Electrical Characteristics table. Below 1.0V, output sinking capability degrades, but the device maintains proper high/low states above this threshold. This feature ensures reliable reset assertion during brownout conditions common in battery-powered or unregulated supplies - a key specification confirmed for MAX6455UT16S+ in the datasheet.

Does MAX6455UT16S+ have push-pull or open-drain outputs?

MAX6455UT16S+ features active-low push-pull outputs on both RESET and MROUT pins, as indicated by the "5" in the part number family and confirmed in the Pin Description table. This eliminates the need for external pullup resistors and allows direct driving of microprocessor reset inputs. Push-pull operation is standard for MAX6455/MAX6456 variants, distinguishing them from open-drain-equipped MAX6454/MAX6456 versions.