Analog Devices Inc./Maxim Integrated MAX6452UT23L+T

Overview

The MAX6452UT23L+T from Maxim Integrated is a dual-supply microprocessor reset supervisor IC with one fixed-threshold (2.313V) and one adjustable-threshold (0.63V reference) voltage monitor, active-low open-drain RESET output, one extended-setup manual reset input (MR1, t_MR = 6.72s), and one immediate-assertion manual reset input (MR2), operating across -40°C to +85°C in a 6-pin SOT23 package. It prevents nuisance resets in set-top boxes and industrial equipment by rejecting short switch closures and transient glitches.

For engineers reviewing the MAX6452UT23L+T datasheet, MAX6452UT23L+T pinout, MAX6452UT23L+T application, or MAX6452UT23L+T equivalent, key selection considerations include its dual manual reset logic (extended + immediate), 0.63V RSTIN reference for custom threshold setting, guaranteed RESET validity down to V_CC = 1.0V, 6µA supply current, and immunity to <20µs transients at 100mV overdrive.

Technical Context

This device implements two independent reset comparators: one monitors V_CC against a factory-set 2.313V threshold (±1.5% accuracy, 60ppm/°C tempco), while the second monitors an external voltage via RSTIN using a precision 0.630V internal reference. The MR1 input requires a 6.72s low assertion before triggering a 140ms–280ms RESET pulse, whereas MR2 asserts RESET immediately on a rising edge with 210ms debounce on release.

Its open-drain RESET output supports level-shifting up to 6V with external pullup, sinks ≥3.2mA at V_CC ≥ 4.25V, and guarantees valid logic state for V_CC ≥ 1.0V. Internal 50kΩ pullups on MR1/MR2 eliminate external components, and the BiCMOS process ensures stable operation across the full industrial temperature range.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6+1), 1.6mm × 2.9mm footprint, RoHS-compliant lead(Pb)-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6451UT23L+T, the MAX6452UT23L+T offers open-drain flexibility for multi-voltage systems but requires a pullup; versus TLV803EC23DBVR, it delivers critical dual-reset logic and adjustable monitoring at higher complexity and cost.

Availability

MAX6452UT23L+T is available at Aetrix Electronics and suitable for set-top boxes, cable modems, DVD players, and industrial PLC modules requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for MAX6452UT23L+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 industrial, communications, and consumer applications.

The MAX6443–MAX6452 family delivers robust µP supervision with extended manual reset timing and dual-threshold monitoring, targeting systems where accidental resets must be eliminated and multiple supply rails require coordinated reset behavior.

FAQ

What is the exact reset threshold voltage for MAX6452UT23L+T?

The MAX6452UT23L+T has a factory-set V_CC reset threshold of 2.313V (±1.5%), corresponding to the "23" suffix per Table 1. Its RSTIN input uses a precise 0.630V internal reference for external voltage monitoring - not a fixed threshold, but a reference enabling custom thresholds via resistor divider.

Does MAX6452UT23L+T support both push-pull and open-drain RESET outputs?

No - the MAX6452UT23L+T features an open-drain RESET output only, as indicated by the "+T" suffix and confirmed in the Ordering Information table. The push-pull variant is the pin-compatible MAX6451UT23L+T. An external pullup resistor is required for MAX6452UT23L+T to drive standard µP reset inputs.

How does the MR2 input function on MAX6452UT23L+T?

On the MAX6452UT23L+T, MR2 is an active-high input: a rising edge triggers an immediate 140ms–280ms RESET pulse. Its release is debounced for 210ms to prevent false deassertion during contact bounce. This differs from MR1, which requires a 6.72s low assertion - making MR2 ideal for fast events like smart-card insertion or test-mode entry.

Can MAX6452UT23L+T monitor a 1.8V supply?

Yes - the MAX6452UT23L+T can monitor a 1.8V supply using its RSTIN pin. With the internal 0.630V reference, a resistor divider (e.g., R1 = 182kΩ, R2 = 100kΩ) sets the trip point at 1.8V. The high-impedance RSTIN input draws only ±25nA, minimizing divider current and power loss.

What is the minimum V_CC required for MAX6452UT23L+T to guarantee valid RESET output?

The MAX6452UT23L+T guarantees valid RESET output logic (low-state sink capability and high-state leakage control) down to V_CC = 1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Below 1.0V, RESET behavior is not guaranteed - though external pulldown resistors may extend usability in specific push-pull configurations (not applicable to MAX6452UT23L+T's open-drain output).