Analog Devices Inc./Maxim Integrated MAX6450UT16L-T

Overview

MAX6450UT16L-T from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (1.575V) and one adjustable-threshold (0.63V reference) voltage monitor, two extended-setup manual reset inputs (MR1/MR2), open-drain active-low RESET output, and 6.72s minimum manual reset pulse width - designed for reliable system reset in consumer electronics and industrial equipment where nuisance resets must be avoided.

For engineers reviewing the MAX6450UT16L-T datasheet, MAX6450UT16L-T pinout, MAX6450UT16L-T application, or MAX6450UT16L-T equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts - all grounded in the official MAX6443–MAX6452 family datasheet Rev 4 (3/2014).

Technical Context

The MAX6450UT16L-T implements a dual-monitor architecture: VCC is monitored against a factory-trimmed 1.575V threshold (±1.5% over -40°C to +85°C), while RSTIN accepts an externally scaled voltage via resistor divider referenced to a precision 0.630V internal comparator. Both monitors trigger a 140ms (min) / 210ms (typ) one-shot RESET pulse when their respective thresholds are violated.

It features two manual reset inputs - MR1 and MR2 - both requiring ≥6.72s low assertion (L-suffix) before asserting RESET; neither supports immediate reset. The open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.25V and remains valid down to VCC = 1.0V, with internal 50kΩ pullups on MR1 and MR2.

Key Specifications

Pinout & Package

MAX6450UT16L-T is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), RoHS-compliant, lead(Pb)-free option available as MAX6450UT16L+T.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6449UT16L-T, MAX6450UT16L-T provides open-drain flexibility for multi-device reset busing; compared with MAX6452UT16L-T, it offers stricter dual-extended-reset security at the cost of losing immediate-reset capability - making it optimal for tamper-resistant consumer devices.

Availability

MAX6450UT16L-T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable modems, industrial HMIs, and medical monitoring devices requiring stable component supply across extended temperature ranges and long-term production cycles.

Supply support for MAX6450UT16L-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, sensing, interface, and timing applications - with emphasis on high-reliability, low-power, and small-footprint solutions.

The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in cost-sensitive consumer and industrial systems where immunity to switch bounce, brownout, and transient noise is mandatory.

FAQ

What is the exact reset threshold voltage for MAX6450UT16L-T?

The MAX6450UT16L-T has a factory-set VCC reset threshold of 1.575V (±1.5% over temperature), per Table 1 suffix "16". Its RSTIN input references a precision 0.630V internal comparator (0.610V to 0.650V over -40°C to +85°C), enabling custom threshold setting via external resistor divider. This dual-threshold architecture allows simultaneous monitoring of primary and auxiliary supplies.

Does MAX6450UT16L-T support immediate manual reset?

No. MAX6450UT16L-T supports only extended-setup manual reset on both MR1 and MR2 inputs, each requiring ≥6.72s (L-suffix) low assertion before RESET pulses. It does not include an immediate-reset input like MAX6451/MAX6452's MR2 rising-edge trigger. This design prioritizes anti-nuisance-reset security over rapid diagnostic reset capability.

What package type and footprint does MAX6450UT16L-T use?

MAX6450UT16L-T is packaged in a 6-pin SOT23 (U6-1 outline, land pattern 90-0175), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, pin 4 = MR2, pin 5 = RSTIN, pin 6 = RESET. It is RoHS-compliant; the lead(Pb)-free version is ordered as MAX6450UT16L+T. No SOT143 or SOT23-5 variants exist for this part number.

Can MAX6450UT16L-T monitor a 1.2V supply?

Yes - using the RSTIN pin. With its 0.630V internal reference, MAX6450UT16L-T can monitor any voltage ≥0.63V by connecting RSTIN to the center tap of a resistor divider. For a 1.2V rail, select R2 = 250kΩ and calculate R1 ≈ 226kΩ using R1 = R2 × (1.2V / 0.63V − 1). The resulting threshold accuracy depends on resistor tolerance and temperature drift.

What is the minimum required pullup resistor for the open-drain RESET output of MAX6450UT16L-T?

The datasheet specifies a minimum 20kΩ pullup resistor to VCC for the open-drain RESET output of MAX6450UT16L-T. This value ensures proper logic-high level under worst-case sink conditions (e.g., 3.2mA at VCC ≥ 4.25V) while limiting current draw. Higher values (e.g., 100kΩ) may be used if rise time requirements permit and bus capacitance is low.