Analog Devices Inc./Maxim Integrated MAX6454UT23S+

Overview

MAX6454UT23S+ from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with separate VCC reset and manual reset outputs, designed for soft-system interrupt (MROUT) and hard-system reboot (RESET) functions. It features a factory-set 2.313V VCC reset threshold, adjustable RSTIN monitoring down to 0.63V, 140ms minimum reset timeout, open-drain outputs, and operation from 1.0V to 5.5V supply over –40°C to +85°C.

For engineers reviewing the MAX6454UT23S+ datasheet, MAX6454UT23S+ pinout, MAX6454UT23S+ application, or MAX6454UT23S+ equivalent, this device supports precise power-monitoring in consumer electronics, set-top boxes, and industrial equipment where independent control of interrupt and reset signals is required.

Technical Context

The MAX6454UT23S+ implements two independent reset paths: VCC reset triggers on monitored supply drop below 2.313V (±1.5% at +25°C), while RSTIN accepts an externally scaled voltage via resistor divider for secondary rail monitoring down to 0.63V. Its manual reset input (MR) controls only MROUT - not RESET - enabling non-disruptive system interrupts without full reboot.

It uses open-drain output architecture for both RESET and MROUT, requiring external pullups, and guarantees valid reset assertion down to VCC = 1.0V. The device draws only 6µA typical supply current at 3.6V and exhibits 60ppm/°C reset threshold tempco for stable performance across temperature.

Key Specifications

Pinout & Package

Package: SOT23-6, surface-mount, lead(Pb)-free (indicated by '+' suffix), 1.6mm × 2.9mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6454UT23T+, the MAX6454UT23S+ provides longer MR setup time for more deliberate interrupt-before-reset sequencing; compared with TPS3808G33DBVR, it delivers essential dual-output architecture and flexible secondary voltage monitoring absent in the TI part.

Availability

MAX6454UT23S+ is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable modems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6454UT23S+ 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 in industrial, consumer, and communications markets.

The MAX6453–MAX6456 family was engineered specifically for systems needing independent soft-interrupt and hard-reset signaling with minimal quiescent power and robust brownout immunity.

FAQ

What is the exact VCC reset threshold voltage for MAX6454UT23S+?

The MAX6454UT23S+ has a factory-trimmed VCC reset threshold of 2.313V, with ±1.5% tolerance at +25°C and 60ppm/°C tempco. This value is confirmed in Table 1 of the datasheet and applies specifically to the '23' suffix variant. The threshold remains stable across the full –40°C to +85°C operating range, making MAX6454UT23S+ suitable for applications monitoring 2.3V–2.5V system rails.

Does MAX6454UT23S+ support monitoring a secondary voltage lower than 2.313V?

Yes, MAX6454UT23S+ supports secondary voltage monitoring down to 0.63V via its RSTIN pin. An external resistor divider scales the target rail (e.g., 1.2V, 1.8V) to match the internal 0.63V reference. The formula VMON_TH = 0.63 × (R1 + R2)/R2 determines the trip point. This feature enables precise supervision of multiple rails with one MAX6454UT23S+ device.

How does the manual reset input (MR) affect the outputs of MAX6454UT23S+?

In MAX6454UT23S+, the MR input controls only the MROUT output - not the RESET output. Pulling MR low immediately asserts MROUT; it remains low for ≥140ms after MR returns high. RESET is unaffected by MR and responds solely to VCC or RSTIN voltage drops. This separation allows use of MROUT as a nonmaskable interrupt (NMI) while preserving autonomous power-fail reset behavior.

What are the absolute maximum ratings for MAX6454UT23S+?

MAX6454UT23S+ has absolute maximum ratings of VCC = –0.3V to +6V, open-drain outputs = –0.3V to +6V, MR/RSTIN = –0.3V to +6V, and MR/push-pull outputs = –0.3V to (VCC + 0.3V). Continuous power dissipation is 696mW at +70°C (derated 8.7mW/°C above), junction temperature limit is +150°C, and storage range is –65°C to +150°C. Exceeding these may cause permanent damage.

Is MAX6454UT23S+ pin-compatible with other devices in the MAX6453–MAX6456 family?

Yes, MAX6454UT23S+ shares identical SOT23-6 pinout and package dimensions with all MAX6453–MAX6456 variants, including MAX6453UT23S+, MAX6455UT23S+, and MAX6456UT23S+. Pin functions (RESET, GND, MROUT, VCC, RSTIN, MR) are consistent across the family. However, output type (open-drain vs. push-pull) and MR-to-RESET interaction differ between subfamilies - MAX6454/MAX6456 use open-drain, while MAX6453/MAX6455 use push-pull.