Analog Devices Inc./Maxim Integrated MAX6719UTYHD3

Overview

MAX6719UTYHD3 from Maxim Integrated is a triple-voltage microprocessor supervisory IC that monitors VCC1 (primary), VCC2 (secondary), and an externally adjustable third supply via RSTIN. It asserts an active-low open-drain reset output when any monitored voltage falls below its threshold (VTH1 = 4.625 V, VTH2 = 3.075 V, VRSTIN = 626.5 mV), with a guaranteed 210 ms (min) reset timeout period and operation down to VCC = 0.8 V. It supports manual reset, watchdog timer, and is used in multivoltage telecom and industrial systems.

For engineers reviewing the MAX6719UTYHD3 datasheet, MAX6719UTYHD3 pinout, MAX6719UTYHD3 application, or MAX6719UTYHD3 equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, confirmed triple-supply monitoring capability, reset timing behavior under brownout conditions, and real-world selection guidance for dual/triple supervisory replacements.

Technical Context

The MAX6719UTYHD3 integrates three independent voltage comparators - one for VCC1 (factory-trimmed at 4.625 V), one for VCC2 (3.075 V), and one for the high-impedance RSTIN input referenced to a 626.5 mV internal bandgap - enabling precise undervoltage detection across three rails. Its reset logic combines OR-ed fault inputs (VCC1/VCC2/RSTIN/MR) with a monostable timeout circuit ensuring minimum 210 ms assertion after recovery.

This device implements a dual-mode watchdog timer: a 35 s (min) startup period after reset, followed by a 1.12 s (min) normal timeout triggered by WDI edge transitions. All reset outputs are open-drain, requiring external pullups, and the IC maintains valid reset state down to VCC1 or VCC2 = 0.8 V - critical for low-voltage brownout immunity in battery-powered equipment.

Key Specifications

Pinout & Package

MAX6719UTYHD3 is housed in a 6-pin SOT23-6 package with gull-wing leads, 0.95 mm pitch, and JEDEC MO-178AC compliant dimensions (2.9 mm × 1.6 mm × 1.1 mm). Pin 1 is marked with a dot; device orientation follows standard SOT23 pin 1 indicator.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6719UTYHD3, MAX6720UTYHD3 offers identical supervision functionality but with push-pull reset drive - simplifying interface design at the cost of reduced flexibility in mixed-voltage reset networks. TPS3808G33DBVR serves only 3.3 V systems and cannot replace MAX6719UTYHD3 in true triple-rail configurations without supplemental circuitry.

Availability

MAX6719UTYHD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and portable medical equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed factory-trimmed voltage thresholds.

Supply support for MAX6719UTYHD3 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6715–MAX6729 family was designed specifically for compact, multivoltage embedded systems needing reliable, low-quiescent-current supervision of two or three independent power rails - with emphasis on brownout resilience and minimal PCB footprint.

FAQ

What is the exact reset timeout period for MAX6719UTYHD3?

The MAX6719UTYHD3 has a guaranteed minimum reset timeout period of 210 ms, corresponding to the 'D3' suffix in its part number. This value is factory-trimmed and specified over the full -40°C to +85°C operating temperature range. The actual timeout may vary slightly due to process and temperature, but will never fall below 210 ms under worst-case conditions. This duration ensures robust µP initialization and peripheral stabilization before release from reset.

Does MAX6719UTYHD3 support monitoring a 1.2 V auxiliary supply?

Yes, MAX6719UTYHD3 supports monitoring a 1.2 V auxiliary supply using its RSTIN pin. With an internal reference of 626.5 mV, a simple resistor divider (e.g., R1 = 110 kΩ, R2 = 120 kΩ) scales the 1.2 V rail to ~626 mV at RSTIN. The device's ±25 nA input leakage ensures minimal error, and the 3 mV hysteresis provides noise immunity. This capability is confirmed in the MAX6719/MAX6720 datasheet section "Adjustable Input Voltage".

Is the reset output of MAX6719UTYHD3 push-pull or open-drain?

The reset output of MAX6719UTYHD3 is open-drain, as confirmed by the Selector Guide and Pin Description table in the datasheet. Pin 1 (RST/RST1) requires an external pullup resistor to VCC1 or another appropriate rail. This configuration allows wired-OR reset signaling and voltage-level translation across different logic families - a key advantage over push-pull outputs in complex multirail systems.

Can MAX6719UTYHD3 operate with VCC1 = 1.8 V and VCC2 = 1.2 V?

Yes, MAX6719UTYHD3 is fully specified to operate with VCC1 = 1.8 V and VCC2 = 1.2 V. Its VCC1 monitoring range spans 1.8 V to 5.0 V, and VCC2 covers 0.9 V to 3.3 V. The device guarantees correct reset logic state down to VCC1 or VCC2 = 0.8 V, making it suitable for modern low-voltage SoC and FPGA platforms. Supply current remains below 28 µA at these levels per the Electrical Characteristics table.

What is the function of the WDI pin on MAX6719UTYHD3?

The WDI (Watchdog Input) pin on MAX6719UTYHD3 monitors µP activity to detect software hangs. If WDI remains static (high or low) beyond the watchdog timeout - 35 s after reset, then 1.12 s thereafter - the device asserts reset. Edge transitions on WDI clear the timer. This dual-mode architecture prevents false triggers during boot while ensuring rapid fault response during runtime. WDI accepts TTL/CMOS logic levels and draws <1 µA.