Analog Devices Inc./Maxim Integrated MAX6356LSUT+T

Overview

MAX6356LSUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with precision reset thresholds for VCC1 (4.63V) and VCC2 (2.93V), plus an adjustable third-voltage monitor input (RSTIN, 1.22V threshold). It delivers active-low push-pull reset referenced to VCC1, debounced manual reset, and operates over –40°C to +85°C in a 6-pin SOT23 package-designed for reliable power sequencing in multivoltage embedded systems.

For engineers reviewing the MAX6356LSUT+T datasheet, MAX6356LSUT+T pinout, MAX6356LSUT+T application, or MAX6356LSUT+T equivalent, key selection criteria include dual-supply reset assertion logic, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, 100ms min reset pulse width, and support for third-voltage monitoring via external resistive divider.

Technical Context

The MAX6356LSUT+T implements independent voltage comparators for VCC1 and VCC2, asserting reset if either supply drops below its factory-set threshold (4.63V and 2.93V respectively). Its RSTIN input provides a fixed 1.22V comparator reference, enabling precise monitoring of a third rail via external resistor divider.

Reset output is active-low, push-pull, referenced to VCC1, with guaranteed low-level drive (≤0.3V at 50µA) and high-level output ≥0.8×VCC1 when VCC1 > VTH1(MAX). The device draws only 20µA typical supply current and maintains valid reset state as long as either VCC1 or VCC2 remains ≥1.0V.

Key Specifications

Pinout & Package

MAX6356LSUT+T is housed in a lead(Pb)-free 6-pin SOT23 package (U6-1 outline), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad option not included. 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 MAX6356LTUT+T, the MAX6356LSUT+T provides higher VCC1 trip point for tighter 5V rail supervision; compared with TPS3808G33, it uniquely integrates RSTIN for true triple-rail monitoring without external components or timing compromises.

Availability

MAX6356LSUT+T is available at Aetrix Electronics and suitable for industrial PLC power sequencing, medical sensor hub supervision, automotive body control modules, and IoT edge gateway power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6356LSUT+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, computing, communications, and consumer applications.

The MAX6351–MAX6360 family delivers multivoltage µP supervision with factory-trimmed thresholds, ultra-low power, and integrated third-rail monitoring-targeting space-constrained, reliability-critical embedded systems.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6356LSUT+T?

The MAX6356LSUT+T has a factory-trimmed VCC1 reset threshold of 4.63V, with guaranteed tolerance of ±0.09V over –40°C to +85°C. This value is confirmed in the Voltage-Threshold Levels table and Electrical Characteristics section of the official datasheet, where "LS" suffix denotes 4.63V/2.93V pairing. The MAX6356LSUT+T uses this precise threshold to supervise nominal 5V supplies in industrial and computing systems.

Does the MAX6356LSUT+T support monitoring of a third voltage, and how is it implemented?

Yes, the MAX6356LSUT+T supports third-voltage monitoring via its RSTIN pin, which features a fixed 1.22V internal comparator threshold. To monitor a voltage higher than 1.22V, connect an external resistive divider between the target rail and RSTIN, with the divider's bottom leg grounded. The MAX6356LSUT+T datasheet provides the exact formula: V_EXT = 1.22V × (1 + R1/R2). This eliminates need for additional supervisor ICs in multirail systems.

What is the reset output configuration of the MAX6356LSUT+T, and what are its drive capabilities?

The MAX6356LSUT+T features an active-low push-pull reset output (RST) referenced to VCC1. It guarantees VOL ≤ 0.3V at 50µA sink current over full temperature range, and VOH ≥ 0.8 × VCC1 when sourcing 350µA (for _W/_V versions) or VCC1 – 1.5V (for _T/_S/_R versions). This direct-drive capability removes need for external pull-up resistors and ensures robust interfacing with µP reset inputs.

How does the MAX6356LSUT+T behave when one supply drops below its threshold while the other remains valid?

The MAX6356LSUT+T asserts reset whenever *either* VCC1 drops below 4.63V *or* VCC2 drops below 2.93V *or* RSTIN falls below 1.22V-regardless of the state of the other supplies. Its reset output remains asserted as long as any monitored condition is violated, and resets only after all three conditions are simultaneously satisfied for the full timeout period (100–280ms). This OR-logic ensures fail-safe response to any single-rail fault.

Is the MAX6356LSUT+T compatible with systems where supply voltages may fall to 1.0V during brownout conditions?

Yes, the MAX6356LSUT+T guarantees valid reset output operation down to VCC1 = 1.0V or VCC2 = 1.0V, as explicitly stated in the datasheet's "Guaranteed RESET Valid to VCC1 = 1V or VCC2 = 1V" feature and Absolute Maximum Ratings. This allows reliable brownout detection and controlled shutdown even during deep undervoltage events-critical for data retention and safe state preservation in the MAX6356LSUT+T's target applications.