Analog Devices Inc./Maxim Integrated MAX6353MTUK+T

Overview

The MAX6353MTUK+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC1, precision factory-set thresholds of 4.38V (VCC1) and 3.08V (VCC2), 20µA supply current, and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used in multivoltage embedded systems to ensure reliable power-on and brownout reset sequencing.

For engineers reviewing the MAX6353MTUK+T datasheet, MAX6353MTUK+T pinout, MAX6353MTUK+T application, or MAX6353MTUK+T equivalent, key selection criteria include dual-supply threshold accuracy, reset pulse width tolerance (100–280ms), manual-reset debouncing, SOT23-5 package compatibility, and absence of watchdog timer functionality in this variant.

Technical Context

This device monitors two independent supply rails (VCC1 and VCC2) and asserts an active-low reset when either drops below its respective threshold. Reset assertion is valid as long as at least one supply remains ≥1.0V, enabling robust operation during asymmetric rail collapse.

The MAX6353MTUK+T implements a fixed-threshold comparator architecture with 20ppm/°C tempco and 100ms minimum power-on reset pulse width. It features a debounced TTL/CMOS-compatible manual-reset input (MR), but excludes watchdog timer and third-voltage monitor inputs found in other family members.

Key Specifications

Pinout & Package

MAX6353MTUK+T is housed in a lead(Pb)-free 5-pin SOT23 package (U5-1 outline), with 1.6mm × 2.9mm footprint and 0.95mm height - compatible with standard high-density PCB assembly processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with MAX6353MTUK+T, the leaded MAX6353MTUK-T offers identical performance but fails RoHS compliance, while TPS3808G33DBVR reduces cost and complexity at the expense of dual-supply supervision - making MAX6353MTUK+T the sole choice for precise, RoHS-compliant dual-threshold reset in SOT23-5 footprint.

Availability

MAX6353MTUK+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and industrial IoT gateways requiring stable component supply with full RoHS compliance and extended temperature support.

Supply support for MAX6353MTUK+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, mixed-signal, and power-management ICs for industrial, computing, and communications applications.

The MAX6351–MAX6360 product line delivers dual- and triple-voltage microprocessor supervisors optimized for reliability-critical embedded systems requiring accurate, low-power, multi-rail power monitoring and reset generation.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6353MTUK+T?

The MAX6353MTUK+T has a factory-set VCC1 threshold of 4.38V (±0.13V over -40°C to +85°C) and VCC2 threshold of 3.08V (±0.15V over temperature). These values are laser-trimmed during production and documented in the Voltage-Threshold Levels table of the MAX6351–MAX6360 datasheet. The "MT" suffix explicitly denotes this 4.38V/3.08V combination.

Does the MAX6353MTUK+T include a watchdog timer function?

No, the MAX6353MTUK+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants (identified by "UT-T" or "UT+T" suffixes and 6-pin SOT23 packaging). The MAX6353MTUK+T is a 5-pin device with only dual-voltage monitoring and manual reset - confirmed by its pin configuration and Selector Guide.

What is the reset output type and drive capability of the MAX6353MTUK+T?

The MAX6353MTUK+T features an active-low push-pull reset output (RST pin) referenced to VCC1. It sinks 1.2mA at VCC1 ≥ 2.7V (VOL ≤ 0.3V) and 3.2mA at VCC1 ≥ 4.5V (VOL ≤ 0.4V), eliminating the need for external pull-up resistors and ensuring fast, rail-defined logic transitions without load dependency.

Can the MAX6353MTUK+T operate with supply voltages below 1.2V?

No - the absolute minimum operating supply is 1.2V for VCC1 and VCC2 over the full -40°C to +85°C range, per Electrical Characteristics. However, the reset output remains valid (i.e., correctly asserted or deasserted) as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, enabling reliable fault signaling during deep brownout down to 1.0V, though full device operation requires ≥1.2V.

Is the MAX6353MTUK+T pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6353MTUK+T shares the same 5-pin SOT23 package and pinout as MAX6352 and MAX6354 variants, but differs functionally: MAX6352 has open-drain RST, MAX6354's RST is referenced to VCC2, and MAX6353MTUK+T's RST is push-pull referenced to VCC1. Direct substitution requires verification of reset output type, voltage reference, and absence of watchdog/third-input features.