Analog Devices Inc./Maxim Integrated MAX6734KALTD3/V+T

Overview

MAX6734KALTD3/V+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +4.625V (VCC1), +3.075V (VCC2), and an adjustable input down to +0.63V via RSTIN. It features open-drain RST and WDO outputs, 140ms–280ms reset timeout (D3), manual reset input, and AEC-Q100 qualification for automotive use.

For engineers reviewing the MAX6734KALTD3/V+T datasheet, MAX6734KALTD3/V+T pinout, MAX6734KALTD3/V+T application, or MAX6734KALTD3/V+T equivalent, this device delivers precise multivoltage supervision with factory-set thresholds, low 14μA supply current, and robust transient immunity - critical for reliable boot sequencing and runtime fault detection in safety-conscious embedded systems.

Technical Context

The MAX6734KALTD3/V+T implements dual fixed-voltage comparators (VCC1 = 4.625V, VCC2 = 3.075V) and a high-impedance adjustable comparator (RSTIN threshold = 626mV) powered from VCC1. Its reset logic asserts active-low RST when any monitored voltage falls below its threshold or MR is pulled low, holding assertion for the D3 timeout (140–280ms).

It integrates a dual-mode watchdog timer: 35s minimum startup delay after reset, then 1.12s minimum normal timeout (tWD-S). The open-drain WDO output deasserts only when valid edges occur on WDI or all supplies exceed thresholds - ensuring lockup detection without false triggers during initialization.

Key Specifications

Pinout & Package

MAX6734KALTD3/V+T is housed in an 8-pin SOT23 package (K8SN+1 outline), footprint-compatible with industry-standard 8-pin SOT23 land patterns (90-0176), with lead(Pb)-free RoHS-compliant plating (+T suffix) and automotive qualification (/V).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6734KALTD3/V+T, MAX6734KATGD3/V+T offers different factory-set thresholds but identical watchdog, MR, and packaging - making it a direct alternative for alternate voltage combinations. TLV809E33DBVR provides only basic reset and cannot replace the triple-monitoring or watchdog functions required in complex embedded systems.

Availability

MAX6734KALTD3/V+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom line cards, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6734KALTD3/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 demanding industrial, automotive, and communications applications - emphasizing reliability, low power, and integration.

The MAX6730–MAX6735 family was developed specifically for high-reliability microprocessor supervision in multivoltage systems, combining reset, watchdog, and manual reset functions in minimal SOT23 packages with AEC-Q100 support.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6734KALTD3/V+T?

The MAX6734KALTD3/V+T has a factory-set VCC1 reset threshold of +4.625V (typical), with a guaranteed range of +4.500V to +4.750V at 25°C. This LT suffix corresponds to the primary supply monitor for +5V systems, and the threshold remains stable across temperature with 20ppm/°C tempco.

Does the MAX6734KALTD3/V+T support monitoring a third voltage, and how is it configured?

Yes, the MAX6734KALTD3/V+T supports monitoring a third voltage via the RSTIN pin, which has a fixed internal reference of +626mV. To monitor higher voltages (e.g., +1.2V, +1.8V), connect a resistive voltage divider between the target supply and GND, with the midpoint fed to RSTIN - the divider ratio sets the effective trip point.

What is the watchdog timeout behavior of the MAX6734KALTD3/V+T during power-up?

The MAX6734KALTD3/V+T implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR), it enters a 35s minimum startup delay before beginning normal 1.12s timeout cycles. This ensures the system completes full initialization before watchdog enforcement begins.

Is the MAX6734KALTD3/V+T pin-compatible with other devices in the MAX6730–MAX6735 family?

Yes, the MAX6734KALTD3/V+T uses the standard 8-pin SOT23 package (K8SN+1) shared with all MAX6734/MAX6735 variants. Pin functions are identical across the MAX6734/MAX6735 series, enabling layout reuse when switching between LT, TG, or other suffix options - though voltage thresholds differ.

What does the "/V+T" suffix indicate in MAX6734KALTD3/V+T?

The "/V" denotes AEC-Q100 qualification for automotive applications (Grade 3, −40°C to +85°C), and "+T" indicates lead(Pb)-free, RoHS-compliant packaging. Together, "/V+T" confirms the MAX6734KALTD3/V+T meets automotive reliability standards and environmental compliance requirements.