Analog Devices Inc./Maxim Integrated MAX6719UTLTD1

Overview

MAX6719UTLTD1 from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (1.575V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference) for auxiliary supply monitoring down to 0.62V. It asserts active-low open-drain reset output with 1.1ms minimum timeout and guarantees valid reset logic down to VCC1 or VCC2 = 0.8V. Used in multivoltage telecom and portable equipment for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6719UTLTD1 datasheet, MAX6719UTLTD1 pinout, MAX6719UTLTD1 application, or MAX6719UTLTD1 equivalent, key selection criteria include dual/third-supply monitoring capability, factory-trimmed thresholds, RSTIN adjustability, open-drain reset output configuration, and guaranteed operation at ultralow supply voltages (≥0.8V).

Technical Context

The MAX6719UTLTD1 implements independent voltage comparators for primary (VCC1), secondary (VCC2), and auxiliary (RSTIN) supplies, each with hysteresis (0.5% typical) and temperature-stable references (20ppm/°C). Its reset timeout timer is fixed at 1.1ms (min), triggered by any monitored supply falling below threshold or manual reset assertion.

It features an open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, and no watchdog or power-fail functionality-confirmed by Selector Guide and Pin Description tables showing MAX6719 as 3-monitor, open-drain RST only, no WDI/PFI/PFO.

Key Specifications

Pinout & Package

6-pin SOT23 package with exposed pad (not electrically connected). Pinout optimized for dual-supply monitoring plus adjustable third-input supervision without watchdog or power-fail functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTLTD1 and TPS3808G125DBVR, the MAX6719UTLTD1 uniquely supports adjustable third-supply monitoring in open-drain configuration-enabling flexible rail coverage without redesigning reset interface logic or adding external components.

Availability

MAX6719UTLTD1 is available at Aetrix Electronics and suitable for telecom infrastructure, portable medical devices, and industrial controllers requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for MAX6719UTLTD1 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 power, sensing, and interface applications in demanding environments.

The MAX6715–MAX6729 product line delivers compact, low-power supervisory circuits for multivoltage systems where reliability, small size, and guaranteed operation at ultralow supply voltages are critical.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719UTLTD1?

The MAX6719UTLTD1 has a factory-trimmed VCC1 reset threshold of 1.575V (typical, falling edge), with ±1.5% tolerance over temperature. This value is confirmed in the Electrical Characteristics table under "VCC1 Reset Threshold" with suffix 'L' corresponding to 1.575V. The MAX6719UTLTD1 uses this precise threshold to supervise 1.8V core supplies while maintaining margin against noise and drift.

Does the MAX6719UTLTD1 include watchdog timer functionality?

No, the MAX6719UTLTD1 does not include watchdog timer functionality. Per the Selector Guide and Pin Description, MAX6719 is explicitly listed without WDI (watchdog input) support. The MAX6719UTLTD1 provides only triple-supply monitoring (VCC1, VCC2, RSTIN), manual reset (MR), and open-drain reset output (RST). Watchdog capability begins with MAX6721 and higher variants.

What is the function of the RSTIN pin on the MAX6719UTLTD1?

The RSTIN pin on the MAX6719UTLTD1 is a high-impedance (±25nA) adjustable undervoltage comparator input with a 626.5mV internal reference. When the voltage at RSTIN falls below this threshold, the device asserts the RST output. Users configure it with an external resistor divider to monitor a third supply-e.g., a 5V rail scaled to 626.5mV-and the MAX6719UTLTD1 guarantees response within 22µs (tRSTIND).

Can the MAX6719UTLTD1 operate with VCC1 or VCC2 below 1.0V?

Yes, the MAX6719UTLTD1 guarantees valid reset output logic down to VCC1 or VCC2 = 0.8V, as specified in the Absolute Maximum Ratings and Detailed Description sections. Below 0.8V, reset behavior is not guaranteed. This feature ensures reliable brownout detection during deep sleep or battery-depletion scenarios where supply rails dip near cutoff.

What package type and pin count does the MAX6719UTLTD1 use?

The MAX6719UTLTD1 uses a 6-pin SOT23 package (SOT23-6), as confirmed in the Ordering Information table and Pin Configurations section. It has no exposed thermal pad connection, and all six pins are electrically assigned: RST, GND, MR, VCC2, RSTIN, and VCC1. This compact footprint supports high-density PCB layouts in space-constrained applications.