Analog Devices Inc./Maxim Integrated MAX6353TWUK+T

Overview

MAX6353TWUK+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 3.08V (VCC1) and 1.67V (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 MAX6353TWUK+T datasheet, MAX6353TWUK+T pinout, MAX6353TWUK+T application, or MAX6353TWUK+T equivalent, key selection considerations include dual-supply threshold accuracy (±1.5% over -40°C to +85°C), manual-reset debouncing, absence of watchdog timer, and SOT23-5 package compatibility with space-constrained industrial controllers and portable equipment.

Technical Context

The MAX6353TWUK+T monitors two independent supply rails (VCC1 and VCC2) and asserts its single active-low push-pull RST output when either falls below its respective factory-trimmed threshold - 3.08V for VCC1 and 1.67V for VCC2. Its reset assertion is valid as long as at least one supply remains ≥1.0V, enabling robust operation during asymmetric rail collapse.

It features a debounced TTL/CMOS-compatible manual-reset input (MR), 100ms minimum power-on-reset pulse width, and no internal watchdog timer - distinguishing it from MAX6359/MAX6360 variants. The device operates across -40°C to +85°C and draws only 20µA typical supply current under full dual-rail bias.

Key Specifications

Pinout & Package

MAX6353TWUK+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 - optimized for high-density PCB layouts in portable and industrial applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6353TWUK+T, the leaded MAX6353TWUK-T offers identical performance but fails modern environmental compliance, while the TPS3808G16DBVR reduces functionality to single-rail supervision - making MAX6353TWUK+T the only RoHS-compliant, true dual-threshold solution in 5-pin SOT23 for 3.08V/1.67V systems.

Availability

MAX6353TWUK+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart energy meters, and multivoltage embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6353TWUK+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 industrial, communications, and computing applications - emphasizing high reliability, low power, and integration.

The MAX6351–MAX6360 family delivers dual- and triple-voltage µP supervisors targeting multirail systems where independent, accurate power-rail monitoring and deterministic reset generation are critical - especially in harsh or battery-constrained environments.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6353TWUK+T?

The MAX6353TWUK+T has factory-trimmed reset thresholds of 3.08V for VCC1 and 1.67V for VCC2, each with ±1.5% tolerance over -40°C to +85°C. These values are confirmed in the Voltage Threshold Levels table and Electrical Characteristics section of the official datasheet. The "TW" suffix explicitly denotes this 3.08V/1.67V combination, and the MAX6353TWUK+T implements them without external components.

Does the MAX6353TWUK+T include a watchdog timer function?

No, the MAX6353TWUK+T does not include a watchdog timer. It belongs to the MAX6353 subgroup (alongside MAX6354/MAX6356), which omits the WDI pin and associated timing circuitry. Watchdog functionality is only present in MAX6358/MAX6359/MAX6360 variants - confirmed by pin configuration diagrams showing Pin 5 as RST (not WDI) and absence of watchdog timing parameters in MAX6353-specific electrical characteristics.

What is the output type and drive capability of the RST pin on the MAX6353TWUK+T?

The RST pin on the MAX6353TWUK+T is an active-low push-pull output referenced to VCC1. It guarantees VOL ≤ 0.3V at ISINK = 1.2mA when VCC1 ≥ 2.7V, and VOH ≥ 0.8 × VCC1 at ISOURCE = 800µA for "T", "S", and "R" versions. This eliminates the need for an external pull-up resistor and allows direct interfacing with standard CMOS microprocessor reset inputs.

Can the MAX6353TWUK+T operate with supply voltages below 1.8V on either rail?

Yes - the MAX6353TWUK+T guarantees functional reset assertion and output validity as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. Its VCC2 threshold is 1.67V, and the device remains operational down to 1.2V (min spec) on both supplies across the full -40°C to +85°C range, supporting modern low-voltage logic domains.

Is the MAX6353TWUK+T pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6353TWUK+T uses the 5-pin SOT23 package and shares identical pinout with MAX6352/MAX6354 variants: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1. However, it is not functionally interchangeable with 6-pin variants (e.g., MAX6356) or those with different reset configurations (e.g., open-drain MAX6352), as confirmed in the Pin Description and Selector Guide sections of the datasheet.