Analog Devices Inc./Maxim Integrated MAX6454UT31S

Overview

MAX6454UT31S from Maxim Integrated is a low-power dual-voltage µP supervisor IC with separate active-low open-drain VCC reset and manual reset outputs, factory-set 3.075V VCC reset threshold, adjustable RSTIN input (0.63V reference), 140ms min reset timeout, and guaranteed valid reset operation down to VCC = 1.0V - used in consumer electronics for coordinated soft/hard system reset sequencing.

For engineers reviewing the MAX6454UT31S datasheet, MAX6454UT31S pinout, MAX6454UT31S application, or MAX6454UT31S equivalent, this page delivers verified functional identity, SOT23-6 package mapping, confirmed pin roles, real-world timing behavior (3.36s MR setup period), and validated alternative options for voltage-monitoring supervisory circuits.

Technical Context

The MAX6454UT31S implements independent monitoring of VCC (3.075V threshold) and an externally adjustable voltage via RSTIN (0.63V comparator reference), with separate assertion paths for RESET (VCC/RSTIN-triggered) and MROUT (MR-triggered only). Its open-drain outputs require external pullups and support level-shifting across supply domains.

It features a fixed 3.36s extended MR setup timeout ('S' suffix), enabling pushbutton-initiated interrupt-before-reset functionality: short press asserts only MROUT (NMI), while ≥3.36s press asserts both MROUT and RESET. Reset assertion persists ≥140ms after all monitored voltages recover.

Key Specifications

Pinout & Package

Supplied in a 6-pin SOT23-6 package (U6-1 land pattern), footprint-compatible with industry-standard 2.9mm × 1.6mm outline and 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6454UT31S, MAX6456UT31S adds MR-gated RESET assertion for unified reset control, while TPS3808G33DBVR reduces quiescent current but eliminates RSTIN flexibility and dual-output sequencing - making MAX6454UT31S optimal for multi-rail consumer devices requiring independent NMI and reboot signals.

Availability

MAX6454UT31S 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 MAX6454UT31S 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 embedded systems.

The MAX6453–MAX6456 family was engineered specifically for dual-rail microprocessor supervision in consumer electronics, delivering independent reset outputs, adjustable monitoring, and robust transient immunity in minimal SOT23-6 form factor.

FAQ

What is the exact VCC reset threshold voltage for MAX6454UT31S?

The MAX6454UT31S has a factory-set VCC reset threshold of 3.075V, with a guaranteed tolerance of ±0.075V (min 3.00V, max 3.15V) over -40°C to +85°C. This value is encoded in the '31' suffix per Table 1 and applies exclusively to the VCC input; the RSTIN input uses a fixed 0.63V comparator reference.

Does MAX6454UT31S assert RESET when the manual reset input (MR) is pressed?

No - MAX6454UT31S does not assert the RESET output in response to MR activity. The MR input controls only the MROUT output. RESET is asserted solely when VCC falls below 3.075V or RSTIN falls below 0.63V. This strict separation is a defining feature of the MAX6454/MAX6453 variants, unlike MAX6455/MAX6456 which link MR to RESET.

What is the purpose of the 'S' suffix in MAX6454UT31S?

Per Table 2, the 'S' suffix denotes a 3.36s typical manual reset setup timeout period. This defines the minimum duration MR must be held low to initiate any action - though for MAX6454UT31S, MR only triggers MROUT regardless of hold time. The 'S' suffix is retained for family consistency and pin/package compatibility across the MAX6453–MAX6456 series.

Can MAX6454UT31S monitor a 1.2V supply using the RSTIN pin?

Yes - the RSTIN pin uses a precise 0.63V internal reference, so a resistor divider (e.g., R1 = 110kΩ, R2 = 250kΩ) scales the 1.2V supply to ~0.63V at RSTIN. The device guarantees RSTIN input current of ±25nA, enabling high-impedance dividers that minimize loading. Threshold hysteresis is 2.5mV, ensuring clean release after brownout recovery.

What package type and dimensions does MAX6454UT31S use?

MAX6454UT31S is supplied in a 6-pin SOT23-6 package (package code U6-1), measuring 2.9mm × 1.6mm × 1.1mm with 0.95mm lead pitch. It follows JEDEC MO-178AB standard, supports tape-and-reel delivery (2500 pcs/reel), and is available in both leaded and lead(Pb)-free versions (replace '-T' with '+T' for RoHS).