Analog Devices Inc./Maxim Integrated MAX6452UT44L-T

Overview

MAX6452UT44L-T from Maxim Integrated is a dual-supply microprocessor supervisory circuit with one fixed-threshold (4.375V) and one adjustable-threshold (0.63V reference) reset monitor, featuring one extended-setup manual reset input (MR1, 6.72s typical) and one immediate-assertion manual reset input (MR2), operating over -40°C to +85°C in a 6-pin SOT23 package for embedded power sequencing and brownout protection in consumer and industrial systems.

For engineers reviewing the MAX6452UT44L-T datasheet, MAX6452UT44L-T pinout, MAX6452UT44L-T application, or MAX6452UT44L-T equivalent, key selection criteria include its dual-monitor architecture (VCC + RSTIN), 6.72s MR1 setup period immunity to nuisance resets, open-drain RESET output, 6µA supply current, and guaranteed reset assertion down to VCC = 1.0V - critical for low-power, high-reliability system initialization.

Technical Context

The MAX6452UT44L-T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 4.375V threshold (±1.5% accuracy), while the second monitors an external voltage via RSTIN using a precision 0.630V internal reference with 2.5mV hysteresis. Both comparators feed into a shared reset timeout timer that asserts RESET for ≥140ms after any monitored supply recovers.

Its dual manual reset architecture combines MR1 (active-low, 6.72s extended setup, internal 50kΩ pullup) and MR2 (active-low, immediate rising-edge-triggered, 200ns propagation delay, 210ms debounced deassertion), enabling coordinated interrupt-before-reset and smart-card-detect functionality without external timing components.

Key Specifications

Pinout & Package

MAX6452UT44L-T is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 is marked by a dot; device orientation follows JEDEC MO-178.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6450UT44L-T and TPS3808G33DBVR, MAX6452UT44L-T uniquely delivers combined fixed+adjustable voltage monitoring, extended + immediate manual reset inputs, and open-drain output - enabling compact, feature-rich supervision in space-constrained multi-rail designs without compromising reliability or flexibility.

Availability

MAX6452UT44L-T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, smart card readers, and industrial PLC modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6452UT44L-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6443–MAX6452 family was designed specifically for robust microprocessor supervision in noisy, multi-rail environments - emphasizing extended manual reset immunity, low quiescent current, and guaranteed operation down to 1.0V VCC.

FAQ

What is the exact reset threshold voltage for MAX6452UT44L-T?

The MAX6452UT44L-T has a factory-trimmed VCC reset threshold of 4.375V (±1.5%), corresponding to the "44" suffix per Table 1. Its RSTIN comparator uses a precision 0.630V internal reference (±1.5%) to monitor external voltages via resistor divider - enabling accurate supervision of rails from 0.63V up to 5.5V.

Does MAX6452UT44L-T support both push-pull and open-drain RESET outputs?

No, MAX6452UT44L-T features an open-drain RESET output only, as confirmed by the Ordering Information table and Pin Configurations section. It requires an external pullup resistor (minimum 20kΩ) to VCC or another logic rail. Push-pull variants exist in the family (e.g., MAX6451UT44L-T) but are distinct part numbers.

How does the MR2 input on MAX6452UT44L-T function compared to MR1?

MR1 on MAX6452UT44L-T is an extended-setup input requiring ≥6.72s low pulse to trigger RESET, while MR2 is edge-triggered: a rising edge immediately asserts RESET for ≥140ms. MR2 also features 210ms debounced deassertion to prevent false removal detection - making it ideal for smart-card insertion sensing.

Can MAX6452UT44L-T monitor a 1.2V core supply?

Yes, MAX6452UT44L-T can monitor a 1.2V core supply using its RSTIN pin. With the internal 0.630V reference, a resistor divider (e.g., R1 = 909kΩ, R2 = 250kΩ) sets the trip point to 1.2V. The RSTIN input draws only ±25nA, minimizing divider current and power loss - critical for battery-powered systems.

What is the minimum VCC voltage at which MAX6452UT44L-T guarantees valid RESET operation?

MAX6452UT44L-T guarantees valid RESET assertion and logic state down to VCC = 1.0V, as specified in the Electrical Characteristics table. Below 1.0V, output drive capability degrades; for applications requiring RESET validity down to 0V, a 100kΩ pulldown resistor is recommended - though this applies only to push-pull variants, not the open-drain MAX6452UT44L-T.