Analog Devices Inc./Maxim Integrated MAX6453UT23S

Overview

MAX6453UT23S from Maxim Integrated is a low-power dual-voltage µP supervisor with separate VCC reset and manual reset outputs, designed for soft-system interrupt (MROUT) and hard-system reboot (RESET) functions. It monitors VCC at 2.313V threshold and supports adjustable secondary voltage monitoring down to 0.63V via RSTIN, with 140ms min reset timeout and 6µA supply current. Used in set-top boxes and industrial equipment for reliable power-on/power-fail sequencing.

For engineers reviewing the MAX6453UT23S datasheet, MAX6453UT23S pinout, MAX6453UT23S application, or MAX6453UT23S equivalent, key selection criteria include factory-set 2.313V VCC threshold, SOT23-6 push-pull output configuration, MR-controlled MROUT-only behavior, guaranteed reset validity down to VCC = 1.0V, and immunity to sub-20µs transients at 100mV overdrive.

Technical Context

The MAX6453UT23S implements independent reset logic paths: VCC reset asserts when VCC falls below 2.313V (±1.5% over -40°C to +85°C), while RSTIN triggers reset when external monitored voltage drops below 0.63V. Its manual reset input (MR) controls only MROUT - not RESET - enabling nonmaskable interrupt generation without affecting system reboot state.

It features precision bandgap-based threshold detection with 60ppm/°C tempco, 2.5mV hysteresis on RSTIN, and glitch rejection of 100ns pulses. The device guarantees valid push-pull RESET output down to VCC = 1.0V and draws just 6µA typical supply current at 3.6V, supporting ultra-low-power embedded supervision.

Key Specifications

Pinout & Package

MAX6453UT23S is housed in a 6-pin SOT23-6 package (U6-1 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, fully specified from -40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6455UT23S, MAX6453UT23S provides dedicated interrupt capability without risking unintended hard reset; compared with TPS3808G125DBVR, it adds critical dual-output flexibility and adjustable secondary monitoring at modest current penalty.

Availability

MAX6453UT23S is available at Aetrix Electronics and suitable for set-top boxes, industrial PLCs, medical infusion pumps, and automotive telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6453UT23S 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, connectivity, and security applications.

The MAX6453–MAX6456 family delivers dual-output µP supervision targeting consumer, industrial, and medical systems needing independent interrupt and reboot control with minimal external components.

FAQ

What is the factory-set VCC reset threshold voltage for MAX6453UT23S?

The MAX6453UT23S has a factory-set VCC reset threshold of 2.313V ±1.5%, as indicated by the "23" suffix per Table 1 in the datasheet. This value is laser-trimmed during production and remains stable across -40°C to +85°C with 60ppm/°C tempco. The threshold applies directly to the VCC pin and requires no external components. MAX6453UT23S uses this precise trip point to initiate RESET assertion when the main supply falls below specification.

Does MAX6453UT23S support monitoring a secondary voltage, and how is it configured?

Yes, MAX6453UT23S supports secondary voltage monitoring via the RSTIN pin, which has a fixed 0.630V threshold. To monitor a custom voltage (e.g., 1.2V or 1.8V), connect RSTIN to the center node of an external resistor divider between the target rail and ground. Use R2 = 250kΩ and calculate R1 = R2 × (VMON_TH / 0.63 − 1). MAX6453UT23S's 25nA max RSTIN leakage ensures minimal divider current draw and high accuracy.

How does the manual reset input (MR) behave on MAX6453UT23S?

On MAX6453UT23S, the MR input controls only the MROUT output - it has no effect on the RESET output. When MR is pulled low, MROUT asserts immediately and remains low for ≥140ms after MR returns high. The internal 50kΩ pullup eliminates external components. This behavior differs from MAX6455UT23S, where MR can trigger both outputs. MAX6453UT23S thus provides safe, isolated interrupt signaling without risk of accidental system reboot.

What output type does MAX6453UT23S use, and what are its drive capabilities?

MAX6453UT23S uses active-low push-pull outputs for both RESET and MROUT, eliminating the need for external pullup resistors. At VCC ≥ 2.55V and ISINK = 1.2mA, VOL ≤ 0.3V; at VCC ≥ 4.75V and ISOURCE = 800µA, VOH ≥ 0.8 × VCC. These specifications ensure robust interfacing with standard CMOS inputs across its 1.0V–5.5V operating range. MAX6453UT23S push-pull architecture simplifies layout and improves noise immunity versus open-drain alternatives.

Is MAX6453UT23S suitable for applications requiring reset assertion below 1.0V VCC?

No - MAX6453UT23S guarantees valid RESET output only down to VCC = 1.0V. Below this, current-sinking capability degrades and output logic state becomes indeterminate. For VCC < 1.0V operation, consider adding a 100kΩ pulldown resistor between RESET and GND (per Figure 6), but note this is only effective for push-pull outputs like those on MAX6453UT23S. The device itself does not assert RESET below 1.0V; MAX6453UT23S is designed for systems where supervision ends at that threshold.