Analog Devices Inc./Maxim Integrated MAX6455UT46S+

Overview

MAX6455UT46S+ from Maxim Integrated is a dual-output µP supervisor IC with factory-set 4.625V VCC reset threshold, adjustable RSTIN input (0.63V reference), and extended manual reset setup period (3.36s typ). It provides separate active-low push-pull RESET and MROUT outputs for soft-system interrupt and hard-system reboot functions in low-power embedded systems operating from 1.0V to 5.5V supply. Used in set-top boxes and industrial equipment requiring reliable brownout detection and controlled reset sequencing.

For engineers reviewing the MAX6455UT46S+ datasheet, MAX6455UT46S+ pinout, MAX6455UT46S+ application, or MAX6455UT46S+ equivalent, key selection criteria include its 4.625V fixed VCC threshold, 3.36s MR extended setup timeout, push-pull output drive capability, 6µA quiescent current, and guaranteed valid reset assertion down to VCC = 1.0V.

Technical Context

The MAX6455UT46S+ implements a dual-comparator architecture: one precision bandgap-based comparator monitors VCC against a factory-trimmed 4.625V threshold (±1.5% over -40°C to +85°C), while a second high-impedance comparator monitors RSTIN against a stable 0.63V internal reference. Its MR input controls both outputs-short press (<3.36s) asserts only MROUT for NMI-style interrupt; long press (≥3.36s) asserts both MROUT and RESET for full system reboot.

This device uses BiCMOS process technology to achieve 6µA supply current and operates across full industrial temperature range (-40°C to +85°C). The push-pull outputs drive logic directly without external pullups, and RESET remains valid down to VCC = 1.0V, enabling robust power-fail response in battery-backed or low-VCC scenarios.

Key Specifications

Pinout & Package

MAX6455UT46S+ is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6455UT44S+, the MAX6455UT46S+ provides higher VCC threshold margin for 4.5V systems; compared with TPS3808G33DBVR, it delivers integrated dual-output control, adjustable secondary monitoring, and push-pull drive-reducing component count and enabling advanced reset sequencing.

Availability

MAX6455UT46S+ is available at Aetrix Electronics and suitable for set-top box manufacturing, industrial PLC design, and medical device production requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6455UT46S+ 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 industrial, medical, communications, and consumer applications, emphasizing reliability, low power, and integration.

The MAX6453–MAX6456 family was engineered specifically for dual-rail microprocessor supervision in space- and power-constrained systems, delivering factory-trimmed thresholds, adjustable monitoring, and intelligent manual reset control in SOT23 packaging.

FAQ

What is the exact VCC reset threshold voltage for MAX6455UT46S+?

The MAX6455UT46S+ has a factory-trimmed VCC reset threshold of 4.625V, with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet and corresponds to the "46" suffix in the part number. The threshold is internally generated and requires no external calibration.

Does MAX6455UT46S+ support monitoring a secondary voltage below 1.0V?

Yes, MAX6455UT46S+ supports monitoring secondary voltages down to 0.63V using the RSTIN pin. Its internal comparator references a precise 0.630V ±1.6% threshold, and an external resistor divider scales the target voltage (e.g., 1.2V, 1.8V, or 2.5V) to match this reference. No secondary supply needs to exceed 1.0V.

How does the manual reset function work on MAX6455UT46S+?

On MAX6455UT46S+, pulling MR low immediately asserts MROUT for system interrupt. If MR remains low for ≥3.36s (the extended setup timeout), both MROUT and RESET assert. After MR is released, both outputs remain low for ≥140ms before deasserting-enabling single-button soft/hard reset differentiation without firmware.

Is MAX6455UT46S+ compatible with 1.8V microcontrollers?

Yes, MAX6455UT46S+ is fully compatible with 1.8V microcontrollers. Its push-pull RESET and MROUT outputs drive low to <0.4V at 3.2mA sink current and high to ≥0.8×VCC when deasserted-even with VCC = 1.8V. The 1.0V minimum operating voltage ensures valid reset behavior during brownout conditions affecting 1.8V rails.

What package type and RoHS status does MAX6455UT46S+ use?

MAX6455UT46S+ uses a 6-pin SOT23 package (package code U6-1) with lead(Pb)-free construction. The "+" suffix in the part number explicitly denotes RoHS compliance per Maxim's ordering convention. Land pattern 90-0175 applies, and the device is qualified for reflow soldering at +260°C peak temperature.