Analog Devices Inc./Maxim Integrated MAX6734KASVD3+T

Overview

The MAX6734KASVD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring two fixed supply rails (VCC1 = +2.925V, VCC2 = +2.188V) and one adjustable rail via RSTIN (626mV threshold), featuring 210ms reset timeout, open-drain RST/WDO outputs, and manual reset input - deployed in telecom power sequencing and industrial embedded controllers.

For engineers reviewing the MAX6734KASVD3+T datasheet, MAX6734KASVD3+T pinout, MAX6734KASVD3+T application, or MAX6734KASVD3+T equivalent, this page delivers verified electrical specs, SOT23-8 pin mapping, real-world use cases in multivoltage systems, and validated alternative parts for voltage supervision design-in.

Technical Context

The MAX6734KASVD3+T implements dual fixed-threshold comparators (VTH1 = 2.925V, VTH2 = 2.188V) and a high-impedance adjustable comparator (VRSTIN = 626mV) with 3mV hysteresis, all referenced to an internal bandgap. Its reset logic asserts active-low RST when any monitored voltage falls below its threshold and holds for 140–280ms (D3 option).

It integrates a dual-mode watchdog timer: 35s minimum startup delay after reset, then 1.12s minimum normal timeout; WDI edge detection clears the timer, while WDO provides open-drain fault signaling independent of RST. MR input includes 50kΩ internal pullup and 1µs minimum pulse width support.

Key Specifications

Pinout & Package

MAX6734KASVD3+T is housed in an 8-pin SOT23 package (K8SN+1 outline), footprint-compatible with JEDEC MO-178AC, with 0.65mm pitch and 2.9mm × 1.6mm body size. Thermal resistance θJA = 180°C/W on 4-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6734KASVD3+T, the D5 variant offers extended reset hold time for slower-booting processors, while TPS3808G33DBVR reduces functionality to single-rail supervision - making MAX6734KASVD3+T uniquely balanced for compact multivoltage systems requiring both precision timing and watchdog independence.

Availability

MAX6734KASVD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6734KASVD3+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, communications, and automotive applications.

The MAX6730–MAX6735 family was engineered specifically for robust, low-power microprocessor supervision in multivoltage embedded systems - emphasizing reset accuracy, watchdog independence, and minimal external component count.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6734KASVD3+T?

The MAX6734KASVD3+T has a nominal VCC1 reset threshold of +2.925V (suffix 'S'), with guaranteed range 2.850V to 3.000V at +25°C. This value is factory-trimmed and specified over -40°C to +85°C with 20ppm/°C tempco. The MAX6734KASVD3+T uses this threshold to supervise +3.3V I/O rails in telecom and industrial systems.

Does the MAX6734KASVD3+T support monitoring a +1.2V core supply?

Yes - the MAX6734KASVD3+T supports +1.2V core monitoring via its RSTIN pin, which features a fixed 626mV internal reference. A resistive divider (e.g., R1 = 1.0MΩ, R2 = 1.1MΩ) scales +1.2V to ~626mV at RSTIN. The MAX6734KASVD3+T guarantees RSTIN input current ≤±25nA, enabling high-impedance, low-power sensing.

What is the watchdog timeout behavior after power-on for the MAX6734KASVD3+T?

After power-on reset, the MAX6734KASVD3+T enters a 35-second (minimum) initial watchdog mode before transitioning to 1.12-second (minimum) normal timeout. This allows full system initialization before watchdog enforcement begins. The MAX6734KASVD3+T asserts WDO low only if WDI remains static beyond these periods - critical for bootloader execution.

Can the MAX6734KASVD3+T operate with VCC1 = +1.8V?

Yes - the MAX6734KASVD3+T operates with VCC1 as low as +0.8V and guarantees valid reset output down to that level. At +1.8V, all specifications including VTH1 = 2.925V remain active, though VCC1 must exceed the reset threshold to avoid continuous assertion. The MAX6734KASVD3+T draws only 10µA typical at +1.8V, supporting low-voltage portable designs.

Is the MAX6734KASVD3+T pin-compatible with other MAX6734 variants?

Yes - all MAX6734 variants (e.g., MAX6734KASVD5+T, MAX6734KATGD3/V+T) share identical SOT23-8 pinout and footprint (K8SN+1). Differences are limited to reset thresholds, timeout period, and qualification grade - allowing drop-in replacement within same suffix family. The MAX6734KASVD3+T maintains full electrical and mechanical compatibility across the series.