Analog Devices Inc./Maxim Integrated MAX6452UT16L+T

Overview

MAX6452UT16L+T from Maxim Integrated is a dual-supply microprocessor reset supervisor IC with one fixed-threshold (1.575V) and one adjustable-threshold (0.63V reference) voltage monitor, extended manual reset setup period (6.72s), push-pull active-low RESET output, and 6-pin SOT23 package. It ensures reliable system initialization in brownout, power-up, and front-panel reset scenarios for consumer and industrial embedded systems.

For engineers reviewing the MAX6452UT16L+T datasheet, MAX6452UT16L+T pinout, MAX6452UT16L+T application, or MAX6452UT16L+T equivalent, key selection considerations include its dual manual reset architecture (MR1 extended + MR2 immediate), guaranteed RESET validity down to VCC = 1.0V, 6µA supply current, 140ms min reset timeout, and RSTIN-based external voltage monitoring capability.

Technical Context

The MAX6452UT16L+T integrates two independent reset comparators: one monitors VCC against a factory-set 1.575V threshold (±1.5% over temperature), while the other monitors RSTIN against a precision 0.630V internal reference, enabling configurable monitoring of voltages as low as 0.63V via external resistor divider. Its dual manual reset inputs operate asymmetrically-MR1 requires a 6.72s low assertion (suffix L), while MR2 triggers an immediate one-shot RESET pulse on rising edge.

RESET output is push-pull active-low with guaranteed logic state down to VCC = 1.0V, VOL ≤ 0.3V at ISINK = 1.2mA, and VOH ≥ 0.8×VCC when deasserted. Internal 50kΩ pullups on MR1 and MR2 eliminate external components, and MR2 features 210ms high-to-low debouncing to prevent false resets during card removal or switch bounce.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6+1), footprint compatible with standard 0.95mm pitch land pattern (Maxim outline 21-0058).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6452UT16L+T, MAX6451UT16L+T offers identical supervision logic but lacks RSTIN adjustability, while TPS3808G15DBVR provides simpler single-rail monitoring without extended setup or dual-input flexibility-making MAX6452UT16L+T uniquely suited for complex multi-rail, front-panel-integrated systems.

Availability

MAX6452UT16L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable/DSL modems, industrial equipment, and medical devices requiring stable component supply across extended temperature ranges.

Supply support for MAX6452UT16L+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 in industrial, automotive, and consumer markets.

The MAX6443–MAX6452 family delivers robust µP reset supervision with extended manual reset immunity and dual-voltage monitoring, targeting applications demanding high reliability in noisy or user-interactive environments.

FAQ

What is the exact VCC reset threshold voltage for MAX6452UT16L+T?

The MAX6452UT16L+T has a factory-set VCC reset threshold of 1.575V, specified with ±1.5% tolerance over the −40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet under suffix "16", and applies to the primary supply monitoring function. The MAX6452UT16L+T does not use a programmable or adjustable threshold for VCC-it relies solely on this precision trimmed value.

Does MAX6452UT16L+T support monitoring a 1.8V supply using the RSTIN pin?

Yes, MAX6452UT16L+T supports monitoring a 1.8V supply via RSTIN using an external resistor divider. With a 0.630V internal reference, setting R2 = 250kΩ and R1 ≈ 460kΩ yields VMON-TH = 0.63 × (460k + 250k)/250k ≈ 1.8V. The MAX6452UT16L+T's high-impedance RSTIN input draws only ±25nA, ensuring minimal divider current and accuracy.

What is the function of the MR2 pin on MAX6452UT16L+T?

The MR2 pin on MAX6452UT16L+T is an active-low manual reset input that triggers an immediate one-shot RESET pulse on its rising edge-not on falling edge. It features 210ms internal debouncing for high-to-low transitions to suppress removal glitches, making it ideal for smart-card detect or test-mode activation. Unlike MR1, MR2 does not require a sustained low condition.

Can MAX6452UT16L+T operate with VCC below 1.0V?

No-MAX6452UT16L+T is not guaranteed to operate or assert valid RESET below VCC = 1.0V. Its electrical specifications define operation from 1.0V to 5.5V, and RESET output logic is only assured down to VCC = 1.0V. Below this, VOL and VOH degrade, and internal comparators may become inactive. For sub-1V operation, alternate solutions must be considered.

Is MAX6452UT16L+T pin-compatible with other devices in the MAX6443–MAX6452 family?

MAX6452UT16L+T uses the 6-pin SOT23 package and shares pinout compatibility with MAX6449UT_ _ _+T, MAX6450UT_ _ _+T, and MAX6451UT_ _ _+T (all U6+1). However, it is not pin-compatible with 4-pin SOT143 (MAX6443/MAX6444) or 5-pin SOT23 (MAX6445–MAX6448) variants due to differing pin counts and RSTIN presence. Always verify pin mapping per device variant.