Analog Devices Inc./Maxim Integrated MAX6734AKAVDD3+T

Overview

MAX6734AKAVDD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring two factory-set supply rails (VCC1 = +2.625V, VCC2 = +0.788V) and one adjustable input (RSTIN = 626mV threshold), featuring open-drain RST/WDO outputs, 280ms reset timeout, and operation from -40°C to +125°C. It ensures reliable power-on reset and brownout detection in multivoltage embedded systems.

For engineers reviewing the MAX6734AKAVDD3+T datasheet, MAX6734AKAVDD3+T pinout, MAX6734AKAVDD3+T application, or MAX6734AKAVDD3+T equivalent, key selection criteria include dual fixed-threshold monitoring, adjustable third-rail support down to +0.63V, 14µA typical supply current, immunity to short VCC transients, and SOT23-8 packaging for space-constrained designs.

Technical Context

The MAX6734AKAVDD3+T implements a triple-supply supervision architecture: VCC1 and VCC2 are monitored by dedicated comparators with factory-trimmed thresholds (+2.625V and +0.788V respectively), while RSTIN uses an internal 626mV reference to monitor a third voltage via external resistor divider. All three inputs feed into a shared reset logic block that asserts active-low RST after any threshold violation.

Its watchdog timer operates in dual-mode: a 35s minimum startup delay after reset enables full system initialization, followed by a 1.12s minimum normal-mode timeout triggered by WDI edge transitions. The open-drain RST and WDO outputs require external pullups and remain valid down to VCC1/VCC2 = +0.8V, supporting robust reset signaling across wide supply ranges.

Key Specifications

Pinout & Package

MAX6734AKAVDD3+T is housed in an 8-pin SOT23-8 package (K8S-3), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and JEDEC MO-178 compliant outline. Its compact footprint supports high-density PCB layouts in portable and networking equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6735AKAVDD3+T, the MAX6734AKAVDD3+T requires external pullups but offers greater flexibility in mixed-voltage interface design; versus TPS3808G33DBVR, it adds essential third-rail supervision and manual reset-critical for complex embedded systems where RSTIN monitoring of core voltage or auxiliary supplies is required.

Availability

MAX6734AKAVDD3+T is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC modules, medical imaging subsystems, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6734AKAVDD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, computing, and consumer markets.

The MAX6730A–MAX6735A product line delivers highly integrated microprocessor supervisors with multi-rail monitoring, independent watchdogs, and extended temperature operation-designed specifically for reliability-critical embedded systems where power integrity and firmware robustness are paramount.

FAQ

What are the factory-set reset thresholds for MAX6734AKAVDD3+T?

The MAX6734AKAVDD3+T has factory-set VCC1 and VCC2 thresholds of +2.625V and +0.788V respectively, per the "RD" and "DD" suffixes in its part number. These values are guaranteed over -40°C to +125°C with ±75mV and ±22mV tolerances. The RSTIN input uses a fixed 626mV internal reference, enabling monitoring of third voltages ≥0.63V via external resistor divider. This configuration is confirmed in Table 1 and Electrical Characteristics sections of the MAX6734AKAVDD3+T datasheet.

Does MAX6734AKAVDD3+T support manual reset functionality?

Yes, MAX6734AKAVDD3+T includes an active-low manual reset input (MR) with a built-in 50kΩ pullup resistor to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer. RST remains asserted for the full 280ms reset timeout period after MR is released high. This feature enables field-service reset via pushbutton and is explicitly documented in the Pin Description and Detailed Description sections for MAX6734AKAVDD3+T.

What is the watchdog timeout behavior of MAX6734AKAVDD3+T?

MAX6734AKAVDD3+T employs a dual-mode watchdog: a 35s minimum startup delay after any reset event (power-up, brownout, or MR assertion), followed by a 1.12s minimum normal-mode timeout after the first valid WDI edge. The watchdog asserts WDO low if WDI remains static beyond these periods. This behavior is inherent to the MAX6734AKAVDD3+T silicon design and is verified in the Watchdog section and Figure 3 of its datasheet.

Can MAX6734AKAVDD3+T monitor a +1.2V supply rail?

Yes, MAX6734AKAVDD3+T can monitor a +1.2V rail using its RSTIN pin. With an internal 626mV reference, a simple resistor divider (e.g., R1 = 100kΩ, R2 = 110kΩ) scales +1.2V to ~626mV at RSTIN. The MAX6734AKAVDD3+T's RSTIN input draws only ±100nA, minimizing divider current. This method is validated in Figure 2 and Applications Information section for MAX6734AKAVDD3+T.

What package type and pin count does MAX6734AKAVDD3+T use?

MAX6734AKAVDD3+T uses an 8-pin SOT23-8 package (K8S-3), with 2.9mm × 1.6mm footprint and gull-wing leads. This is confirmed in the Ordering Information table and Package Information section of the MAX6734AKAVDD3+T datasheet. The pinout differs from 6-pin variants (e.g., MAX6732A) by adding VCC2 and RSTIN terminals to support triple-supply monitoring.