Analog Devices Inc./Maxim Integrated MAX6734KATGD3/V+T

Overview

MAX6734KATGD3/V+T from Maxim Integrated is an AEC-Q100 qualified triple-voltage microprocessor supervisor IC with open-drain reset and watchdog outputs, monitoring VCC1 at 3.075V (T suffix), VCC2 at 2.313V (G suffix), and adjustable RSTIN down to 626mV - all in an 8-pin SOT23 package. It delivers 140ms–280ms reset timeout (D3), 35s initial watchdog startup, and 1.12s normal watchdog timeout for automotive power-rail supervision.

For engineers reviewing the MAX6734KATGD3/V+T datasheet, MAX6734KATGD3/V+T pinout, MAX6734KATGD3/V+T application, or MAX6734KATGD3/V+T equivalent, this page provides verified circuit role, factory-set dual fixed thresholds + one adjustable input, AEC-Q100 qualification status, SOT23-8 mechanical data, and validated automotive-grade alternatives - all confirmed from Maxim's official documentation and ordering guide.

Technical Context

The MAX6734KATGD3/V+T implements a triple-supply monitoring architecture: two factory-trimmed comparators (VCC1 = 3.075V, VCC2 = 2.313V) and one high-impedance adjustable comparator (RSTIN = 626mV reference) enabling third-rail supervision via external resistor divider. Its independent watchdog timer features dual-mode timing - 35s min startup delay after reset and 1.12s min normal timeout - with WDI edge-triggered clearing logic.

All supervisory functions operate over -40°C to +85°C with guaranteed reset validity down to VCC1/VCC2 = +0.8V, 14µA typical supply current at +3.6V, and immunity to sub-100ns VCC transients. The open-drain RST and WDO outputs require external pullups and support bidirectional µP reset interfaces without contention when used with appropriate series resistors.

Key Specifications

Pinout & Package

MAX6734KATGD3/V+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), measuring 2.9mm × 1.6mm × 1.1mm with 0.65mm pitch. The package supports lead(Pb)-free RoHS compliance (+T suffix) and AEC-Q100 qualification (/V+T).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6734KATGD3/V+T, MAX6734KALTD3/V+T offers different fixed thresholds but identical package, AEC-Q100 qualification, and triple-rail architecture, whereas TPS3808G33DBVR is a single-rail alternative requiring supplemental supervision for multi-voltage designs.

Availability

MAX6734KATGD3/V+T is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power sequencing, and ADAS camera modules requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.

Supply support for MAX6734KATGD3/V+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 automotive, industrial, and communications applications, with emphasis on high-reliability power management and supervision solutions.

The MAX6730–MAX6735 family was engineered specifically for automotive and industrial multi-rail systems requiring simultaneous voltage monitoring, watchdog protection, and AEC-Q100 compliance - with MAX6734KATGD3/V+T targeting triple-supply applications in harsh environments.

FAQ

What does the 'T' and '/V+T' suffix indicate in MAX6734KATGD3/V+T?

The 'T' denotes lead(Pb)-free RoHS-compliant packaging, while '/V+T' explicitly confirms AEC-Q100 qualification for automotive use plus RoHS compliance. This dual suffix distinguishes MAX6734KATGD3/V+T from commercial-grade variants like MAX6734KATGD3+T and ensures full automotive reliability testing per Grade 3 temperature range.

How is the RSTIN pin used in MAX6734KATGD3/V+T for monitoring voltages above 0.63V?

The RSTIN pin in MAX6734KATGD3/V+T uses an internal 626mV reference voltage; to monitor higher voltages (e.g., +5V or +12V), connect a resistive voltage divider between the target rail and GND, with the midpoint fed to RSTIN. The divider ratio must scale the rail voltage to ≤626mV at RSTIN - for example, a 7.5:1 ratio monitors +5V as 667mV, slightly above threshold, requiring fine-tuning.

Does MAX6734KATGD3/V+T support push-pull reset output?

No, MAX6734KATGD3/V+T provides an open-drain RST output, as confirmed by its MAX6734 designation (vs. MAX6735 for push-pull). It requires an external pullup resistor to VCC1 or another valid supply; the output sinks current when asserted low and floats when deasserted - compatible with bidirectional µP reset pins when used with a 10kΩ series resistor.

What is the significance of the 'D3' suffix in MAX6734KATGD3/V+T?

The 'D3' suffix specifies a reset timeout period of 140ms minimum / 280ms maximum, selected from six factory-programmed options. This duration ensures sufficient reset hold time for complex automotive microcontrollers to complete internal initialization before releasing reset, while avoiding excessive delays that could impact system startup timing budgets.

Can MAX6734KATGD3/V+T operate with VCC1 and VCC2 swapped in the circuit?

Yes - MAX6734KATGD3/V+T automatically selects the higher of VCC1 or VCC2 as the active supply rail for internal biasing, allowing flexible layout where either pin may connect to the dominant rail. However, the VCC1 threshold (3.075V) and VCC2 threshold (2.313V) remain fixed to their respective pins regardless of voltage level, so correct assignment is required for accurate monitoring.