Analog Devices Inc./Maxim Integrated MAX6727AKASYD3+T

Overview

MAX6727AKASYD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit with externally adjustable third-voltage monitoring (RSTIN), 140ms reset timeout, and open-drain active-low RST output. It monitors VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed thresholds, guarantees valid reset down to VCC = 0.8V, and operates across –40°C to +125°C - used in telecom power management and industrial embedded controllers.

For engineers reviewing the MAX6727AKASYD3+T datasheet, MAX6727AKASYD3+T pinout, MAX6727AKASYD3+T application, or MAX6727AKASYD3+T equivalent, key selection criteria include dual-rail voltage monitoring capability, 140ms minimum reset timeout (suffix D3), RSTIN-adjustable threshold at 626.5mV ±15.5mV, open-drain RST output referenced to VCC1, and guaranteed operation at VCC1/VCC2 ≥ 0.8V.

Technical Context

The MAX6727AKASYD3+T implements independent dual-voltage comparators for VCC1 and VCC2, each with factory-trimmed reset thresholds and 0.5% hysteresis. Its RSTIN input uses an internal 626.5mV reference to monitor a third supply via external resistor divider, with 100nA max input current and 22µs propagation delay.

It features a 140ms (min) reset timeout timer (D3 suffix), open-drain RST output with 0.3V VOL at ISINK = 500µA (VCC ≥ 1.8V), and manual-reset input (MR) with 50kΩ internal pullup to VCC1 and 200ns MR-to-RST delay. No watchdog or power-fail functions are included in this variant.

Key Specifications

Pinout & Package

MAX6727AKASYD3+T is housed in an 8-pin SOT23 package (package code K8SN+1), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 180°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with MAX6723AKASYD3+T, MAX6727AKASYD3+T provides higher VCC1/VCC2 thresholds optimized for 3.0V/1.2V systems, while TPS3808G33DBVR offers lower current but sacrifices dual-rail capability - making MAX6727AKASYD3+T irreplaceable for multivoltage sequencing where both rails must be independently validated before release.

Availability

MAX6727AKASYD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, automotive ADAS camera ECUs, and medical portable monitor battery management requiring stable component supply across extended temperature ranges.

Supply support for MAX6727AKASYD3+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.

The MAX6715A–MAX6729A family delivers ultra-low-voltage, dual/triple-supply supervisory circuits in miniature SOT23 packages - engineered specifically for space-constrained, multirail embedded systems needing guaranteed reset behavior down to 0.8V.

FAQ

What is the reset timeout period of the MAX6727AKASYD3+T?

The MAX6727AKASYD3+T has a minimum reset timeout period of 140ms, as indicated by the 'D3' suffix in its part number. This timeout begins after all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds and ensures the microprocessor remains held in reset long enough to complete stable power-up initialization before release.

Does the MAX6727AKASYD3+T support watchdog functionality?

No, the MAX6727AKASYD3+T does not include watchdog functionality. Per the Pin Description table and Functional Diagram, it lacks WDI (Watchdog Input) connectivity. Watchdog capability is present only in MAX6721A–MAX6729A/MAX6797A variants with explicit WDI pin assignment - the MAX6727AKASYD3+T is a dedicated dual-supply supervisor with RSTIN adjustment.

What are the factory-trimmed reset thresholds for VCC1 and VCC2 on the MAX6727AKASYD3+T?

The MAX6727AKASYD3+T uses 'S' suffix for VCC1 (2.850V–3.000V, typ 2.925V) and 'G' suffix for VCC2 (1.080V–1.140V, typ 1.110V), per the Reset Voltage Threshold Suffix Guide. These thresholds are laser-trimmed at wafer test and guaranteed over temperature, eliminating need for external resistor networks for primary/secondary rail monitoring.

Can the MAX6727AKASYD3+T monitor a 1.8V supply using the RSTIN input?

Yes, the MAX6727AKASYD3+T can monitor a 1.8V supply via RSTIN using a resistor divider. With its 626.5mV internal reference, a ratio of R1/R2 = 1.87 achieves VEXT_TH = 1.8V. The low 100nA RSTIN input current allows high-value resistors (e.g., 1MΩ/536kΩ), minimizing divider power loss while maintaining accuracy.

Is the MAX6727AKASYD3+T pin-compatible with other devices in the MAX6715A–MAX6729A family?

The MAX6727AKASYD3+T uses the 8-pin SOT23 package (K8SN+1) and shares pinout compatibility with MAX6728A/MAX6729A/MAX6797A variants. However, pin functions differ: PFO and RST2 are no-connect in MAX6727A, while they are active in MAX6728A/MAX6729A - direct replacement requires verification of unused pin states and feature alignment.