Analog Devices Inc./Maxim Integrated MAX6452UT29L+T

Overview

MAX6452UT29L+T from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (2.925V) and one adjustable-threshold (0.63V reference) voltage monitor, extended manual reset setup period (6.72s), active-low open-drain RESET output, and 6-pin SOT23 package. It ensures reliable system reset during power-up, brownout, and front-panel-initiated recovery in consumer electronics and industrial equipment.

For engineers reviewing the MAX6452UT29L+T datasheet, MAX6452UT29L+T pinout, MAX6452UT29L+T application, or MAX6452UT29L+T equivalent, key selection considerations include its dual manual reset architecture (MR1 extended + MR2 immediate), guaranteed RESET assertion down to VCC = 1.0V, 6µA supply current, 140ms min reset timeout, and RSTIN-based monitoring of voltages as low as 0.63V.

Technical Context

The MAX6452UT29L+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.925V threshold (±1.5% over -40°C to +85°C), while the other monitors RSTIN against a precision 0.630V internal reference (±0.015V, ±2.5mV hysteresis). Its dual manual reset inputs operate asymmetrically-MR1 requires a 6.72s low assertion (L-suffix), while MR2 triggers an immediate one-shot RESET pulse on rising edge.

RESET is open-drain with guaranteed VOL ≤ 0.4V at ISINK = 3.2mA (VCC ≥ 4.25V) and leakage < 1µA when deasserted. Internal 50kΩ pullups on MR1/MR2 eliminate external components, and the device remains functional across VCC = 1.0V–5.5V with full temperature guarantee (-40°C to +85°C).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6451UT29L+T, the MAX6452UT29L+T offers open-drain compatibility with multi-voltage systems but requires a pullup; versus TPS3808G33DBVR, it provides dual-rail monitoring and asymmetric reset inputs at higher ICC, enabling more robust system-level recovery workflows.

Availability

MAX6452UT29L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable/DSL modems, and industrial equipment requiring stable component supply, long-term lifecycle support, and guaranteed performance across extended temperature ranges.

Supply support for MAX6452UT29L+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, and interface applications, with emphasis on reliability and integration.

The MAX6443–MAX6452 family delivers highly configurable µP reset supervision targeting consumer, industrial, and automotive systems where immunity to transient glitches and flexible manual reset behavior are critical.

FAQ

What is the exact VCC reset threshold voltage for MAX6452UT29L+T?

The MAX6452UT29L+T has a factory-trimmed VCC reset threshold of 2.925V, with ±1.5% tolerance over the full -40°C to +85°C operating range. This value is confirmed in Table 1 of the datasheet under suffix "29", and applies specifically to the MAX6452UT29L+T - not inferred from adjacent variants. The threshold exhibits 60ppm/°C tempco and 2×VTH hysteresis.

Does MAX6452UT29L+T support monitoring a 1.2V supply rail?

Yes, the MAX6452UT29L+T supports monitoring a 1.2V rail using its RSTIN pin. With the internal 0.630V reference and an external resistor divider (e.g., R1 = 909kΩ, R2 = 1MΩ), the monitored threshold becomes VMON-TH = 0.63 × (R1 + R2)/R2 ≈ 1.2V. The RSTIN input draws only ±25nA, enabling high-impedance dividers that minimize current drain.

How does the MR2 pin function on MAX6452UT29L+T?

The MR2 pin on MAX6452UT29L+T is an immediate-response manual reset input: a rising edge (low-to-high transition) triggers a one-shot RESET pulse lasting ≥140ms. It is internally debounced for 210ms on the falling edge to prevent false assertions during switch bounce. Unlike MR1, MR2 requires no extended hold time - making it ideal for smart-card detect or emergency interrupt signals.

What package type and dimensions does MAX6452UT29L+T use?

The MAX6452UT29L+T uses a 6-pin SOT23 package (package code U6+1), measuring 1.6mm × 2.9mm with 0.95mm height. Pin pitch is 0.95mm, and the land pattern follows Maxim's outline no. 21-0058. This compact RoHS-compliant package supports automated assembly and fits high-density consumer PCB layouts.

Can MAX6452UT29L+T operate with VCC below 1.0V?

No - the MAX6452UT29L+T is guaranteed to function only down to VCC = 1.0V. Below this, RESET output logic state is not assured, and internal comparators may become inactive. For applications requiring valid reset down to 0V, a pulldown resistor (e.g., 100kΩ) must be added to the RESET line - but only if using the push-pull variant (MAX6451), not the open-drain MAX6452UT29L+T.