Analog Devices Inc./Maxim Integrated MAX6727KAYHD3+T

Overview

MAX6727KAYHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It asserts active-low open-drain reset outputs with 210ms minimum timeout, supports manual reset and watchdog timer, and operates from -40°C to +85°C for reliable power sequencing in multivoltage embedded systems.

For engineers reviewing the MAX6727KAYHD3+T datasheet, MAX6727KAYHD3+T pinout, MAX6727KAYHD3+T application, or MAX6727KAYHD3+T equivalent, this page delivers verified specifications, dual open-drain RST output behavior, RSTIN-based third-supply monitoring capability, watchdog startup timing (35s/1.12s), and validated alternative options for dual/triple-supply supervision.

Technical Context

The MAX6727KAYHD3+T implements independent voltage comparators for primary (VCC1), secondary (VCC2), and auxiliary (RSTIN) supplies, each referenced to factory-trimmed thresholds with ±1.5% accuracy over temperature. Its dual open-drain RST outputs share identical logic control but drive separate pins-enabling independent reset signaling to multiple system domains without contention.

It integrates a dual-mode watchdog timer: a 35s minimum startup period after any reset event, followed by a 1.12s minimum normal timeout triggered by WDI edge transitions. The manual reset input (MR) features a 50kΩ internal pullup to VCC1 and guarantees reset assertion for ≥200ns after MR release, ensuring robust debounced reset initiation.

Key Specifications

Pinout & Package

MAX6727KAYHD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for high-density PCB layouts in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6727KAYHD3+T, MAX6725KAHGD3+T offers complementary output types but fewer independent reset channels, while TPS3808G33DBVR reduces size and current draw at the expense of triple-supply capability and supervision features.

Availability

MAX6727KAYHD3+T is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC controllers, medical imaging sensor nodes, and 5G small cell baseband units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6727KAYHD3+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 industrial, automotive, communications, and computing markets, with emphasis on reliability and integration.

The MAX6715–MAX6729 family delivers compact, ultra-low-power supervisory solutions for multivoltage systems-specifically engineered to replace discrete reset circuits and reduce board area in space-critical embedded designs.

FAQ

What are the exact reset threshold voltages for MAX6727KAYHD3+T?

The MAX6727KAYHD3+T has factory-trimmed VCC1 reset threshold of 4.625V (±1.5%) and VCC2 threshold of 3.075V (±1.5%). Its RSTIN input uses a precise 626.5mV internal reference, allowing external resistor dividers to set custom trip points-for example, a 1.2V rail monitored with 1.93:1 resistor ratio. These values are guaranteed over the full -40°C to +85°C operating range.

Does MAX6727KAYHD3+T support watchdog functionality, and how does it operate?

Yes, MAX6727KAYHD3+T includes a dual-mode watchdog timer. After any reset event (power-up, MR, or brownout), it enters a 35s minimum startup period to allow full system initialization. Once the first valid WDI edge occurs, it switches to 1.12s minimum normal timeout mode. This architecture prevents false timeouts during boot while enforcing strict runtime software supervision-ensuring the MAX6727KAYHD3+T remains responsive to hung firmware.

How many reset outputs does MAX6727KAYHD3+T provide, and what type are they?

MAX6727KAYHD3+T provides two independent active-low reset outputs (pins 1 and 4), both open-drain. They share identical logic control-asserting simultaneously when VCC1, VCC2, or RSTIN falls below threshold, MR is pulled low, or the watchdog times out-and remain low for the full 210ms timeout period. This dual-output design enables concurrent reset of separate subsystems (e.g., CPU and FPGA) without shared pull-up conflicts.

Can MAX6727KAYHD3+T monitor a 1.2V core supply, and how is it configured?

Yes, MAX6727KAYHD3+T monitors a 1.2V core supply via its RSTIN pin using the internal 626.5mV reference. Configure with a resistor divider: R1 between 1.2V rail and RSTIN, R2 between RSTIN and GND. For exact trip at 1.2V, use R1/R2 ≈ 0.92 (e.g., R1 = 92kΩ, R2 = 100kΩ). The MAX6727KAYHD3+T's 25nA max RSTIN input current ensures minimal divider loading and high accuracy.

What package and pin count does MAX6727KAYHD3+T use, and is it RoHS-compliant?

MAX6727KAYHD3+T uses an 8-pin SOT23-8 package (2.0mm × 2.1mm footprint) with lead-free +T suffix confirming RoHS compliance. The package supports reflow soldering per JEDEC J-STD-020, and its thermal characteristics (714mW max power dissipation at +70°C) ensure stable operation in high-density industrial PCB layouts. Pinout is fully documented in the Maxim datasheet for MAX6727KAYHD3+T.