Analog Devices Inc./Maxim Integrated MAX6727KAVHD1

Overview

MAX6727KAVHD1 from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 2.925V and 1.665V respectively, 210ms reset timeout, and open-drain dual RST outputs - used to ensure reliable power-on reset and brownout protection in multivoltage embedded systems.

For engineers reviewing the MAX6727KAVHD1 datasheet, MAX6727KAVHD1 pinout, MAX6727KAVHD1 application, or MAX6727KAVHD1 equivalent, key selection criteria include its dual open-drain reset outputs, adjustable third-supply monitoring via RSTIN, watchdog timer support, manual reset input, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V.

Technical Context

The MAX6727KAVHD1 integrates three independent voltage monitors: VCC1 (2.925V threshold), VCC2 (1.665V threshold), and RSTIN (626.5mV internal reference), each triggering active-low reset assertion when its input falls below threshold. It features a 210ms minimum reset timeout period and supports manual reset (MR) with 50kΩ internal pullup and 1µs minimum pulse width.

This device implements a dual-mode watchdog timer: 35s minimum startup period after reset, followed by 1.12s minimum normal timeout; WDI transitions clear the timer, and failure to update within timeout asserts reset. All reset outputs are open-drain, requiring external pullups, and operate reliably with VCC1 or VCC2 ≥ 0.8V.

Key Specifications

Pinout & Package

MAX6727KAVHD1 is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm footprint), thermally optimized for high-density PCB layouts and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6727KAVHD1, MAX6725KAHVD1 offers push-pull RST2 for direct CMOS interfacing but sacrifices RSTIN adjustability, while TPS3808G33DBVR reduces cost and current for basic 3.3V reset-only use cases but eliminates multirail coordination and watchdog functionality entirely.

Availability

MAX6727KAVHD1 is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC controllers, portable medical monitors, and 5G small cell baseband units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6727KAVHD1 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, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.

The MAX6715–MAX6729 family delivers compact, ultra-low-voltage supervisory solutions targeting multivoltage embedded systems where reliability, small size, and accurate threshold monitoring are critical.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6727KAVHD1?

The MAX6727KAVHD1 has factory-trimmed reset thresholds of 2.925V (typical, falling) for VCC1 and 1.665V (typical, falling) for VCC2, as defined by the "AV" suffix in its part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +85°C and exhibit ±1.5% tolerance at +25°C.

Does MAX6727KAVHD1 support watchdog functionality, and what are its timeout periods?

Yes, MAX6727KAVHD1 includes a dual-mode watchdog timer: a 35s minimum startup timeout after any reset event (power-up, MR, or watchdog-triggered), followed by a 1.12s minimum normal timeout during steady-state operation. A valid edge on WDI clears the timer; absence of edges longer than timeout asserts reset for 210ms.

How many reset outputs does MAX6727KAVHD1 provide, and what are their electrical types?

MAX6727KAVHD1 provides two active-low open-drain reset outputs: RST/RST1 (pin 1/4, referenced to VCC1) and RST2 (pin 8, referenced to VCC2). Both require external pullup resistors and support wired-OR configurations for multi-IC reset arbitration.

Can MAX6727KAVHD1 monitor a third supply voltage, and how is it configured?

Yes, MAX6727KAVHD1 monitors a third supply via the RSTIN pin (pin 5), which compares the input against a 626.5mV internal reference. A resistor divider from the target supply to GND sets the trip point using V_{EXT_TH} = 626.5mV × (R1 + R2)/R2, enabling monitoring down to 0.62V.

What is the minimum supply voltage at which MAX6727KAVHD1 guarantees valid reset output behavior?

MAX6727KAVHD1 guarantees correct reset output logic state (asserted or deasserted) as long as either VCC1 or VCC2 remains above 0.8V - a key feature for robust brownout detection in systems with asymmetric rail collapse or partial power loss scenarios.