Analog Devices Inc./Maxim Integrated MAX6452UT44L

Overview

MAX6452UT44L 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), designed for reliable system reset control in brownout, power-up, and front-panel-initiated recovery scenarios.

For engineers reviewing the MAX6452UT44L datasheet, MAX6452UT44L pinout, MAX6452UT44L application, or MAX6452UT44L equivalent, this device delivers precise voltage monitoring, glitch-immune manual reset timing, push-pull or open-drain RESET output selection, and automotive-grade temperature operation (-40°C to +85°C) in a compact 6-pin SOT23 package.

Technical Context

The MAX6452UT44L integrates two independent reset comparators: one monitors VCC against a factory-trimmed 4.375V threshold (±1.5% accuracy, 60ppm/°C tempco), while the second monitors RSTIN against a precision 0.63V internal reference, enabling external resistor-divider configuration for custom supply thresholds down to 0.63V. It supports dual manual reset logic paths - MR1 requires sustained low assertion for 6.72s (L-suffix) before triggering a 140ms–280ms one-shot RESET pulse, whereas MR2 responds immediately to a rising edge with debounced assertion and 210ms debounce on release.

Its RESET output is open-drain (per ordering suffix "-T"), guaranteed functional down to VCC = 1.0V, with VOL ≤ 0.4V at 3.2mA sink and ILKG ≤ 1µA when deasserted. The device draws only 6µA typical supply current at 3.6V and operates across the full industrial temperature range with no external components required for basic supervision.

Key Specifications

Pinout & Package

MAX6452UT44L is housed in a RoHS-compliant 6-pin SOT23 package (package code U6-1, outline 21-0058), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and standard land pattern 90-0175.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6452UT44L, MAX6450UT44L removes immediate MR2 functionality but retains dual extended-reset capability, while MAX6449UT44L simplifies to single extended-reset input - both alternatives reduce feature count but sacrifice the unique dual-mode (extended + immediate) reset flexibility essential for user-interface-critical applications.

Availability

MAX6452UT44L is available at Aetrix Electronics and suitable for industrial PLC modules, automotive infotainment head units, and consumer set-top boxes requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.

Supply support for MAX6452UT44L 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, automotive, communications, and consumer markets.

The MAX6443–MAX6452 family was designed to deliver robust, low-power microprocessor supervision with configurable reset thresholds and intelligent manual reset logic for systems demanding immunity to switch bounce, voltage transients, and brownout conditions.

FAQ

What is the exact reset threshold voltage for MAX6452UT44L?

The MAX6452UT44L has a factory-trimmed VCC reset threshold of 4.375V (±1.5%), corresponding to the "44" suffix per Table 1. This value is guaranteed over -40°C to +85°C with 60ppm/°C tempco and 2×VTH hysteresis. The RSTIN input uses a separate 0.630V reference for adjustable monitoring.

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

No - MAX6452UT44L is specifically ordered with open-drain RESET output, indicated by the "-T" suffix in its full part number. Push-pull variants exist in the family (e.g., MAX6452UT44+T), but MAX6452UT44L requires an external pullup resistor (≥20kΩ) to function correctly in most µP reset circuits.

How does the MR2 input on MAX6452UT44L differ from MR1?

MR1 on MAX6452UT44L is an active-low input requiring ≥6.72s low assertion (L-suffix) to trigger RESET; MR2 is active-high and asserts RESET on any rising edge, with 210ms debounce on release. This enables MR2 to serve as instant test or smart-card detect signal, while MR1 handles deliberate system reset.

Can MAX6452UT44L monitor a 1.2V supply rail?

Yes - the RSTIN pin on MAX6452UT44L accepts an external resistor divider referenced to the internal 0.630V comparator threshold. Using R1 = 225kΩ and R2 = 250kΩ yields VMON-TH ≈ 1.2V, enabling precise supervision of low-voltage rails with negligible current draw due to RSTIN's <25nA input leakage.

What is the minimum VCC voltage at which MAX6452UT44L guarantees valid RESET output?

MAX6452UT44L guarantees correct RESET output logic state (low when asserted, high-impedance when deasserted) for VCC ≥ 1.0V. Below 1.0V, output behavior is not guaranteed - however, the device remains powered and functional down to VCC = 1.0V, ensuring reliable reset during brownout recovery.