Analog Devices Inc./Maxim Integrated MAX6356TZUT+T

Overview

MAX6356TZUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with push-pull active-low reset referenced to VCC1, 3.08V VCC1 threshold, 2.32V VCC2 threshold, and adjustable RSTIN input for monitoring a third voltage at 1.22V. It operates over –40°C to +85°C in a 6-pin SOT23 package and ensures system reliability in multivoltage embedded controllers.

For engineers reviewing the MAX6356TZUT+T datasheet, MAX6356TZUT+T pinout, MAX6356TZUT+T application, or MAX6356TZUT+T equivalent, key selection criteria include dual-supply reset assertion behavior, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, 100ms minimum reset pulse width, and support for third-voltage monitoring via RSTIN.

Technical Context

The MAX6356TZUT+T monitors three supply rails: VCC1 (3.08V threshold), VCC2 (2.32V threshold), and an external voltage via RSTIN (1.22V comparator reference). Reset is asserted if either VCC1 or VCC2 drops below its threshold, or if RSTIN falls below 1.22V - enabling robust fault detection across heterogeneous power domains.

It features a debounced TTL/CMOS-compatible manual-reset input (MR), guarantees valid reset output as long as either VCC1 ≥ 1V or VCC2 ≥ 1V, and draws only 20µA typical supply current. No watchdog timer is included - confirmed by device family mapping (MAX6355/MAX6356/MAX6357 lack WDI functionality).

Key Specifications

Pinout & Package

MAX6356TZUT+T is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline) with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 is RST (active-low push-pull reset referenced to VCC1), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC2, Pin 5 is RSTIN (third-voltage monitor input), and Pin 6 is VCC1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6355TZUT+T and TPS3808G30DBVR, the MAX6356TZUT+T uniquely delivers push-pull reset drive plus integrated third-voltage supervision - reducing BOM count and PCB area in space-constrained multivoltage systems.

Availability

MAX6356TZUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered IoT sensors, multivoltage medical diagnostics, automotive body control modules, and intelligent instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX6356TZUT+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, computing, and consumer applications.

The MAX6351–MAX6360 product line delivers highly integrated, factory-trimmed supervisory circuits optimized for multivoltage embedded systems where reliability, low power, and minimal external components are critical.

FAQ

What is the function of the RSTIN pin on the MAX6356TZUT+T?

The RSTIN pin on the MAX6356TZUT+T is a dedicated input for monitoring a third voltage rail, with an internal 1.22V comparator threshold. When the voltage applied to RSTIN falls below this level, the device asserts its active-low RST output. This enables precise supervision of auxiliary supplies like ADC references or PLL bias voltages without adding discrete components. The MAX6356TZUT+T uses RSTIN exclusively for this purpose - it does not serve as a reset input or general-purpose comparator.

Does the MAX6356TZUT+T include a watchdog timer?

No, the MAX6356TZUT+T does not include a watchdog timer. It belongs to the MAX6355/MAX6356/MAX6357 subgroup, which adds the RSTIN third-voltage monitor but omits the WDI (watchdog input) functionality found in MAX6358/MAX6359/MAX6360 variants. The MAX6356TZUT+T provides only power-supply monitoring and manual reset - no timeout-based processor activity checking. For watchdog capability, consider MAX6359TZUT+T instead.

What are the exact voltage thresholds for VCC1 and VCC2 on the MAX6356TZUT+T?

The MAX6356TZUT+T has a VCC1 threshold of 3.08V (±0.05V at +25°C, ±0.15V over –40°C to +85°C) and a VCC2 threshold of 2.32V (±0.03V at +25°C, ±0.13V over temperature). These values are factory-trimmed and specified in the Voltage Threshold Levels table under suffix "TZ". Both thresholds are guaranteed to maintain accuracy across the full operating temperature range, supporting reliable detection of undervoltage conditions on dual-rail systems.

How does the MAX6356TZUT+T ensure reset validity during low-supply conditions?

The MAX6356TZUT+T guarantees valid reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a key specification enabling robust brownout response. Its push-pull RST output remains functional and correctly asserted even when one supply collapses near ground, provided the other stays above 1V. This behavior is explicitly tested and guaranteed per the Absolute Maximum Ratings and Electrical Characteristics tables, making the MAX6356TZUT+T suitable for systems requiring fail-safe reset under partial power loss.

Is the MAX6356TZUT+T pin-compatible with other devices in the MAX6351–MAX6360 family?

Yes, the MAX6356TZUT+T shares the same 6-pin SOT23 (U6-1) package and pinout as MAX6351, MAX6355, MAX6357–MAX6360 - including identical assignments for RST (Pin 1), GND (Pin 2), MR (Pin 3), VCC2 (Pin 4), RSTIN (Pin 5), and VCC1 (Pin 6). However, functional differences exist: MAX6356TZUT+T provides push-pull RST referenced to VCC1, while MAX6355TZUT+T offers open-drain RST and MAX6357TZUT+T provides push-pull RST referenced to VCC2. Board-level substitution requires verification of reset drive type and voltage reference.