Analog Devices Inc./Maxim Integrated MAX6450UT16L

Overview

MAX6450UT16L 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. It ensures reliable system reset during power-up, brownout, and front-panel-initiated recovery in consumer electronics and industrial embedded systems.

For engineers reviewing the MAX6450UT16L datasheet, MAX6450UT16L pinout, MAX6450UT16L application, or MAX6450UT16L equivalent, this page delivers verified functional identity, confirmed SOT23-6 package mapping, validated 6-pin terminal roles, exact reset timeout (140ms min), precise VCC threshold (1.575V ±1.5%), and real-world design implications for manual reset immunity and RSTIN-based monitoring.

Technical Context

The MAX6450UT16L integrates two independent reset comparators: one monitors VCC against a factory-trimmed 1.575V threshold (±1.5% over -40°C to +85°C), while the second monitors RSTIN against a precision 0.630V internal reference (±0.015V, -40°C to +85°C). Both comparators drive a shared open-drain RESET output with guaranteed assertion down to VCC = 1.0V.

Its dual manual reset architecture requires MR1 and MR2 to be held low simultaneously for ≥6.72s (L-suffix) before generating a 140ms–280ms one-shot RESET pulse; MR2 also supports immediate edge-triggered assertion via rising-edge detection with 210ms debouncing. The device uses BiCMOS process and operates across -40°C to +85°C.

Key Specifications

Pinout & Package

MAX6450UT16L is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant, tape-and-reel packaged (2500 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6449UT16L, MAX6450UT16L adds immediate MR2 edge-triggering capability; compared with MAX6452UT16L, it provides dual extended-setup inputs rather than mixed-mode reset-choice depends strictly on whether system requires dual long-press, single long-press + immediate, or dual immediate reset behavior.

Availability

MAX6450UT16L is available at Aetrix Electronics and suitable for set-top box power sequencing, DVD player brownout recovery, cable modem firmware updates, industrial PLC watchdog interfacing, and medical device power integrity requiring stable component supply across extended temperature ranges.

Supply support for MAX6450UT16L 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 high-reliability industrial and automotive solutions.

The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in noisy consumer and industrial environments, featuring extended manual reset immunity, dual-monitor capability, and ultra-low quiescent current.

FAQ

What is the exact VCC reset threshold voltage for MAX6450UT16L?

The MAX6450UT16L has a factory-trimmed VCC reset threshold of 1.575V, with ±1.5% tolerance over the full -40°C to +85°C operating range. This value is defined by the "16" suffix per Table 1 and is guaranteed-not typical-across temperature and supply voltage variations. The threshold exhibits 60ppm/°C tempco and 2×VTH hysteresis.

How does the dual manual reset function work on MAX6450UT16L?

MAX6450UT16L requires both MR1 and MR2 to be held low for ≥6.72 seconds (L-suffix) to assert RESET for 140–280ms. Additionally, a rising edge on MR2 alone triggers an immediate RESET pulse (debounced 210ms), enabling two distinct reset modes: long-press system reset and quick edge-triggered recovery-both managed within a single IC.

Can MAX6450UT16L monitor a 1.2V supply rail?

Yes. MAX6450UT16L uses its RSTIN pin with a 0.630V internal reference to monitor external rails. To supervise a 1.2V supply, connect RSTIN to a resistor divider (e.g., R1 = 90.5kΩ, R2 = 100kΩ) yielding VMON-TH = 0.63 × (190.5/100) ≈ 1.2V. Leakage current is <25nA, minimizing divider power loss.

What is the minimum VCC required for MAX6450UT16L to guarantee RESET assertion?

MAX6450UT16L guarantees valid RESET assertion down to VCC = 1.0V. Below this, output sinking capability degrades rapidly. The device remains functional and monitors VCC down to 1.0V, ensuring brownout detection even during deep undervoltage events common in battery-powered or unregulated supply scenarios.

Does MAX6450UT16L support open-drain and push-pull RESET outputs?

No. MAX6450UT16L features open-drain RESET only, as indicated by the "T" suffix in its ordering code (UT16L). Push-pull variants exist in the family (e.g., MAX6443US16L), but MAX6450UT16L requires an external pullup resistor (≥20kΩ) to VCC or another logic rail to define the high state of the RESET signal.