Analog Devices Inc./Maxim Integrated MAX6353LSUK+T

Overview

MAX6353LSUK+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 2.93V (VCC2), 20µA supply current, and operation over –40°C to +85°C. It monitors two independent power rails in multivoltage embedded systems and asserts reset if either supply drops below its threshold.

For engineers reviewing the MAX6353LSUK+T datasheet, MAX6353LSUK+T pinout, MAX6353LSUK+T application, or MAX6353LSUK+T equivalent, key selection criteria include dual-supply monitoring capability, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, manual-reset debouncing, and compatibility with 5-pin SOT23 PCB footprints for space-constrained designs.

Technical Context

The MAX6353LSUK+T implements dual independent voltage comparators with hysteresis, each tied to a dedicated supply input (VCC1 and VCC2), with reset assertion triggered when either falls below its precise threshold. Its push-pull RST output is referenced solely to VCC1 and guarantees valid logic levels across the full operating voltage range.

No watchdog timer or third-voltage monitor is integrated - unlike MAX6358/MAX6359/MAX6360 or MAX6355/MAX6356/MAX6357 variants - and it lacks open-drain configuration or RST2 output, distinguishing it from MAX6351, MAX6352, MAX6354, and MAX6355 series members.

Key Specifications

Pinout & Package

MAX6353LSUK+T is housed in a lead(Pb)-free 5-pin SOT23 package (package code U5-1), with 0.95mm pitch, 2.9mm × 1.6mm body size, and thermal pad omitted. Pin 1 is RST (active-low push-pull, referenced to VCC1); Pin 2 is GND; Pin 3 is MR (debounced manual-reset input); Pin 4 is VCC2; Pin 5 is VCC1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6353LSUK+T, MAX6353LTUK+T offers identical functionality with a higher VCC1 threshold ideal for +5V systems, while TPS3808G33DBVR provides lower-cost single-rail supervision but cannot replace dual-voltage coordination or ensure coordinated reset across two independent supplies.

Availability

MAX6353LSUK+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical handheld diagnostics, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6353LSUK+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 high-performance analog and mixed-signal ICs for industrial, communications, computing, and consumer applications.

The MAX6351–MAX6360 family delivers precision dual- and triple-voltage supervision for multirail embedded systems, targeting reliability-critical applications where coordinated reset across multiple power domains is essential.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6353LSUK+T?

The MAX6353LSUK+T has a factory-set VCC1 threshold of 4.38V (±0.08V at +25°C, ±0.13V over –40°C to +85°C) and a VCC2 threshold of 2.93V (±0.05V at +25°C, ±0.08V over temperature). These values are laser-trimmed during production and documented in the Voltage-Threshold Levels table of the MAX6351–MAX6360 datasheet. The "LS" suffix explicitly denotes this threshold pair, and the MAX6353LSUK+T maintains these values across its full industrial temperature range.

Does the MAX6353LSUK+T include a watchdog timer function?

No, the MAX6353LSUK+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358, MAX6359, and MAX6360 variants within the same family. The MAX6353LSUK+T is a dual-voltage supervisor with manual reset (MR) input and a single active-low push-pull RST output referenced to VCC1 - it lacks WDI pin, startup timeout, or normal-mode watchdog timing circuitry. This simplifies design for applications requiring only voltage monitoring and manual reset coordination.

What is the package type and pin configuration of the MAX6353LSUK+T?

The MAX6353LSUK+T uses a 5-pin SOT23 package (outline U5-1), with pin 1 = RST (active-low push-pull output referenced to VCC1), pin 2 = GND, pin 3 = MR (debounced manual-reset input), pin 4 = VCC2 (secondary supply input), and pin 5 = VCC1 (primary supply input). This matches the MAX6352/MAX6353/MAX6354 pinout group and is distinct from the 6-pin configurations used by MAX6351 or MAX6355-series devices.

Can the MAX6353LSUK+T operate with supply voltages below 2.0V?

Yes, the MAX6353LSUK+T guarantees valid reset output operation as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a key feature for brownout resilience. However, its specified operating range begins at VCC1/VCC2 = +1.2V (minimum over –40°C to +85°C), and full parameter performance (e.g., threshold accuracy, reset pulse width) is ensured only above that level. Below 1.2V, the device remains functional but may exhibit reduced timing or comparator precision, as noted in the Absolute Maximum Ratings and Electrical Characteristics tables.

Is the MAX6353LSUK+T pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6353LSUK+T shares the same 5-pin SOT23 pinout with MAX6352 and MAX6354, but differs electrically: MAX6352 has an open-drain RST output, while MAX6354's RST is referenced to VCC2. It is not pin-compatible with 6-pin variants (e.g., MAX6351, MAX6355, MAX6359) due to differing pin count and functions (e.g., RST2, RSTIN, WDI). Always verify pin mapping and electrical behavior - especially RST reference rail and output type - before substitution.