Analog Devices Inc./Maxim Integrated MAX6727KAZGD3+T

Overview

MAX6727KAZGD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and an externally adjustable RSTIN input down to 0.626V. It provides two open-drain active-low reset outputs (RST/RST1 and RST2), manual reset input, watchdog timer with 35s startup and 1.12s normal timeout, and operates from -40°C to +85°C in 8-pin SOT23. Used in multivoltage telecom and industrial systems requiring reliable power sequencing and brownout detection.

For engineers reviewing the MAX6727KAZGD3+T datasheet, MAX6727KAZGD3+T pinout, MAX6727KAZGD3+T application, or MAX6727KAZGD3+T equivalent, key selection criteria include dual independent reset outputs, factory-trimmed VTH1/VTH2 thresholds (2.25V/2.313V/2.375V and 2.125V/2.188V/2.250V), 210ms min reset timeout, 14µA typical supply current at 3.6V, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V.

Technical Context

The MAX6727KAZGD3+T implements a dual-threshold voltage monitor for primary (VCC1) and secondary (VCC2) supplies plus a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic asserts both RST/RST1 and RST2 simultaneously upon any monitored voltage drop below threshold, MR assertion, or watchdog timeout - maintaining low state for a fixed 210ms minimum timeout period after recovery.

It integrates a dual-mode watchdog timer: 35s minimum initial timeout after power-up/manual reset, transitioning to 1.12s minimum normal timeout after first WDI edge; manual reset includes 200ns delay and 100ns glitch rejection; RSTIN and PFI share identical 626.5mV reference with ±15mV tolerance and 3mV hysteresis.

Key Specifications

Pinout & Package

MAX6727KAZGD3+T is housed in an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm body height), optimized for space-constrained PCB layouts while maintaining thermal performance across -40°C to +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6727KAZGD3-T, the MAX6727KAZGD3+T offers identical electrical and timing behavior with lead-free termination; versus TPS3808G33DBVR, it delivers essential triple-supply supervision, dual reset outputs, and power-fail alerting - making it irreplaceable in complex embedded power architectures.

Availability

MAX6727KAZGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and battery-powered edge devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6727KAZGD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems needing compact, low-power, triple-rail supervision with integrated watchdog and power-fail signaling - targeting space- and power-constrained telecom and industrial control platforms.

FAQ

What is the exact reset timeout period for MAX6727KAZGD3+T?

The MAX6727KAZGD3+T has a guaranteed minimum reset timeout period of 140ms, typical value of 210ms, and maximum of 280ms. This fixed timeout is factory-set by the "D3" suffix and applies identically to both RST/RST1 and RST2 outputs after any reset trigger event - including VCC1/VCC2 undervoltage, RSTIN fault, MR assertion, or watchdog timeout.

Does MAX6727KAZGD3+T support monitoring a negative supply voltage?

Yes, MAX6727KAZGD3+T can monitor negative supplies using the PFI input with an appropriate resistor-divider network as shown in Figure 3b of the datasheet. When the negative rail drops, PFO goes high - enabling interrupt generation or cascaded reset assertion. The internal 626.5mV reference remains valid, and accuracy depends on resistor tolerance and PFI input current (±25nA).

How are the VTH1 and VTH2 thresholds determined for MAX6727KAZGD3+T?

The "KAZ" suffix in MAX6727KAZGD3+T specifies VTH1 = 2.25V/2.313V/2.375V and VTH2 = 2.125V/2.188V/2.250V per the Reset Voltage Threshold Suffix Guide. These are factory-trimmed values with ±1.5% initial accuracy and 20ppm/°C tempco - eliminating need for external calibration in most applications.

Can MAX6727KAZGD3+T generate a power-fail interrupt without asserting system reset?

Yes, MAX6727KAZGD3+T provides independent PFO (power-fail output) functionality. When PFI falls below 626.5mV, PFO asserts low immediately - with no reset timeout delay - allowing firmware to initiate controlled shutdown. This occurs without affecting RST/RST2 states unless the same fault also breaches VCC1/VCC2 or RSTIN thresholds.

What is the function of the two reset outputs (RST/RST1 and RST2) on MAX6727KAZGD3+T?

MAX6727KAZGD3+T features two physically separate open-drain reset outputs: RST/RST1 is referenced to VCC1 and intended for logic-domain reset, while RST2 is referenced to VCC2 for core-domain reset. Both assert simultaneously on any fault condition and remain low for the full 210ms timeout - enabling independent pullup to different supply rails or isolation via optocouplers.