Analog Devices Inc./Maxim Integrated MAX6735KATGD3+T

Overview

MAX6735KATGD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+3.075V nominal), VCC2 (+2.313V nominal), and an adjustable RSTIN input (626mV threshold). It features push-pull RESET and WDO outputs, 140ms–280ms reset timeout (D3 option), and operates across –40°C to +85°C. Used in multivoltage embedded systems requiring reliable power-on reset and lockup recovery.

For engineers reviewing the MAX6735KATGD3+T datasheet, MAX6735KATGD3+T pinout, MAX6735KATGD3+T application, or MAX6735KATGD3+T equivalent, this page delivers verified electrical parameters, SOT23-8 package layout, factory-set dual fixed thresholds plus adjustable third-channel monitoring, watchdog startup delay (35s min), and design-specific guidance for manual reset integration and transient immunity.

Technical Context

The MAX6735KATGD3+T implements a triple-supply supervisory architecture: two factory-trimmed voltage comparators (VCC1 = 3.075V, VCC2 = 2.313V) and one high-impedance adjustable comparator (RSTIN = 626mV reference) enabling third-rail monitoring via external resistor divider. Its dual-mode watchdog timer provides 35s minimum startup delay followed by 1.12s normal timeout, with independent push-pull WDO assertion on timeout or undervoltage.

Reset logic combines OR-ed fault conditions - VCC1/VCC2 undervoltage, RSTIN drop below 626mV, or active-low MR assertion - driving a push-pull RST output that remains asserted for the full D3 timeout (140–280ms). The device guarantees valid reset down to VCC1/VCC2 = +0.8V and draws only 14µA typical supply current at +3.6V.

Key Specifications

Pinout & Package

SOT23-8 package: 2.9mm × 1.6mm footprint, 1.1mm height, lead(Pb)-free, RoHS-compliant, thermal resistance θJA = 180°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6734KATGD3+T, the MAX6735KATGD3+T offers push-pull outputs eliminating pullup components, while TPS3808G33DBVR lacks the dual fixed + adjustable rail architecture essential for multivoltage SoC supervision.

Availability

MAX6735KATGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive electronics requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6735KATGD3+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 demanding industrial, automotive, and communications applications.

The MAX6730–MAX6735 family targets high-reliability embedded systems needing coordinated multi-rail reset, robust watchdog supervision, and operation across extended temperature ranges - specifically engineered for SoC-based equipment with tight power and space constraints.

FAQ

What are the exact factory-set reset thresholds for MAX6735KATGD3+T?

The MAX6735KATGD3+T has VCC1 threshold = +3.075V (T suffix) and VCC2 threshold = +2.313V (Z suffix), per Table 1 in the datasheet. These are factory-trimmed values with ±1.5% tolerance over –40°C to +85°C. The RSTIN input uses a fixed +626mV internal reference, enabling adjustable third-rail monitoring via external resistor divider.

Does MAX6735KATGD3+T support manual reset, and how is it implemented?

Yes, MAX6735KATGD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion for the full D3 timeout period (140–280ms) after release. A normally open momentary switch from MR to GND provides hardware reset without external components or debounce circuitry.

What is the watchdog behavior of MAX6735KATGD3+T during power-up?

Upon power-up or reset, MAX6735KATGD3+T enters a 35s minimum watchdog startup delay (tWD-L) to allow full system initialization. After this period - or after the first valid WDI edge - it switches to normal mode with 1.12s minimum timeout (tWD-S). WDO asserts low if no WDI transition occurs within the active timeout window.

Can MAX6735KATGD3+T monitor a +1.8V rail using the RSTIN pin?

Yes. To monitor +1.8V with MAX6735KATGD3+T's RSTIN pin (626mV threshold), use a resistor divider where R1 connects to +1.8V, R2 connects to GND, and RSTIN connects to the node between them. Set R1/R2 ratio so that (R2/(R1+R2)) × 1.8V = 0.626V - e.g., R1 = 187kΩ, R2 = 100kΩ yields ~0.626V at RSTIN.

What package type and RoHS status does MAX6735KATGD3+T use?

MAX6735KATGD3+T uses an 8-pin SOT23-8 package (2.9mm × 1.6mm), lead(Pb)-free and RoHS-compliant, indicated by the "+T" suffix. Thermal characteristics include θJA = 180°C/W and θJC = 60°C/W, supporting operation up to +85°C ambient with appropriate PCB copper area.