Analog Devices Inc./Maxim Integrated MAX6454UT29S+T

Overview

MAX6454UT29S+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with separate active-low open-drain VCC reset and manual reset outputs, factory-set 2.925V VCC reset threshold, 0.63V adjustable RSTIN input, 140ms minimum reset timeout, and guaranteed valid reset operation down to VCC = 1.0V - used in consumer electronics power sequencing and brownout protection.

For engineers reviewing the MAX6454UT29S+T datasheet, MAX6454UT29S+T pinout, MAX6454UT29S+T application, or MAX6454UT29S+T equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, functional differences vs. MAX6453/MAX6455 variants, and real-world use cases for soft/hard reset coordination in embedded systems.

Technical Context

The MAX6454UT29S+T implements independent monitoring paths: one precision bandgap-based comparator for VCC (2.925V ±1.5% threshold), and a high-impedance adjustable comparator for RSTIN (0.630V ±15mV threshold) enabling external resistor-divider configuration. Its MR input controls only MROUT - not RESET - making it suitable for nonmaskable interrupt generation without triggering full system reboot.

This variant uses open-drain outputs for both RESET and MROUT, requiring external pullup resistors, and features 6µA typical supply current at 3.6V, 140ms min reset timeout, and immunity to transients ≤20µs when VCC dips 100mV below threshold - all specified across –40°C to +85°C.

Key Specifications

Pinout & Package

SOT23-6 package (6-pin, 1.6mm × 2.9mm, 0.95mm height), RoHS-compliant lead(Pb)-free construction (indicated by "+T" suffix), fully specified over –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6453UT29S+T, the MAX6454UT29S+T offers open-drain flexibility for multi-voltage domain interfacing but requires external pullups; compared with MAX6455UT29S+T, it lacks MR-controlled RESET, simplifying reset logic but removing soft/hard reset duality - ideal for dedicated interrupt-only use cases.

Availability

MAX6454UT29S+T is available at Aetrix Electronics and suitable for consumer electronics, industrial equipment, and medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6454UT29S+T 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 interface applications in industrial, communications, and consumer markets.

The MAX6453–MAX6456 family targets cost-sensitive, space-constrained embedded systems needing dual-path reset supervision with minimal external components and guaranteed operation across wide temperature and voltage ranges.

FAQ

What is the exact VCC reset threshold voltage for MAX6454UT29S+T?

The MAX6454UT29S+T has a factory-set VCC reset threshold of 2.925V, with ±1.5% tolerance over temperature (–40°C to +85°C). This value is fixed per the "29" suffix in the part number and confirmed in Table 1 of the datasheet. The MAX6454UT29S+T uses this threshold to monitor 3.3V supply rails with high accuracy and no external calibration required.

Does MAX6454UT29S+T support monitoring a 1.2V core rail?

Yes - the MAX6454UT29S+T supports monitoring a 1.2V core rail via its RSTIN pin, which has a fixed 0.630V threshold. By connecting RSTIN to the center tap of an external resistor divider (e.g., R1 = 1.0MΩ, R2 = 250kΩ), the device triggers reset when the 1.2V rail drops to ~1.17V. The MAX6454UT29S+T's high-impedance RSTIN input draws only ±25nA, minimizing divider current.

How does the manual reset input (MR) affect the RESET output in MAX6454UT29S+T?

In the MAX6454UT29S+T, the MR input affects 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. RESET is solely controlled by VCC and RSTIN voltage levels. This isolation is a key distinction from the MAX6455/MAX6456 variants and is explicitly documented in the General Description and Pin Description sections for MAX6454UT29S+T.

What package type and footprint does MAX6454UT29S+T use?

The MAX6454UT29S+T uses the SOT23-6 package (package code U6-1), measuring 1.6mm × 2.9mm with 0.95mm height and 0.95mm pin pitch. Land pattern number 90-0175 applies, and the "+T" suffix confirms lead(Pb)-free RoHS compliance. This compact, surface-mount package supports high-density PCB layouts in space-constrained consumer electronics where the MAX6454UT29S+T is commonly deployed.

Is MAX6454UT29S+T compatible with 1.8V microcontrollers?

Yes - the MAX6454UT29S+T operates from VCC = 1.0V to 5.5V and guarantees valid reset assertion down to VCC = 1.0V. Its open-drain RESET and MROUT outputs can interface with 1.8V logic when pulled up to 1.8V, and MR input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC). This makes the MAX6454UT29S+T suitable for mixed-voltage systems containing 1.8V µCs alongside higher-voltage rails.