Analog Devices Inc./Maxim Integrated MAX6719UTLTD3+T

Overview

MAX6719UTLTD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V 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 with 210ms minimum timeout and guarantees valid reset output while either VCC1 or VCC2 ≥ 0.8V - ideal for multivoltage embedded systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6719UTLTD3+T datasheet, MAX6719UTLTD3+T pinout, MAX6719UTLTD3+T application, or MAX6719UTLTD3+T equivalent, key selection criteria include its dual-supply monitoring capability with factory-trimmed thresholds, RSTIN-based third-voltage supervision, 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and guaranteed operation down to 0.8V supply voltage.

Technical Context

The MAX6719UTLTD3+T implements a dual-threshold comparator architecture: one for primary supply (VCC1 = 4.625V ±125mV) and one for secondary supply (VCC2 = 3.075V ±75mV), both referenced to internal bandgap references with 20ppm/°C tempco. Its RSTIN input uses a dedicated 626.5mV internal reference to support external resistor-divider–based monitoring of a third voltage as low as 0.62V.

This device features an open-drain RST output with 210ms (min) reset timeout, manual reset (MR) with internal 50kΩ pullup to VCC1, and no watchdog or power-fail functionality - confirmed by Selector Guide and Pin Configuration tables. It operates across –40°C to +85°C and draws only 14µA typical supply current at 3.6V.

Key Specifications

Pinout & Package

MAX6719UTLTD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free (+T suffix). The package supports reflow soldering per JEDEC J-STD-020 and is rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTLTD3+T, the MAX6719UTLTD3+T offers open-drain flexibility for shared reset buses but requires a pullup; versus TPS3808G33DBVR, it adds essential RSTIN-based third-rail supervision at the cost of slightly higher unit price and design complexity.

Availability

MAX6719UTLTD3+T is available at Aetrix Electronics and suitable for industrial PLC power sequencing, network router multirail monitoring, and medical portable diagnostic devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6719UTLTD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6715–MAX6729 family was designed specifically for compact, ultra-low-power microprocessor supervision in space-constrained multivoltage systems - emphasizing factory-trimmed accuracy, minimal external components, and robust brownout immunity.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719UTLTD3+T?

The MAX6719UTLTD3+T has a factory-trimmed VCC1 reset threshold of 4.625V, with a guaranteed range of 4.500V to 4.750V at +25°C. This value is encoded in the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6719UTLTD3+T - not the broader MAX6719 family.

Does the MAX6719UTLTD3+T include a watchdog timer function?

No, the MAX6719UTLTD3+T does not include a watchdog timer. According to Maxim's Selector Guide and Pin Configuration table, only MAX6721 through MAX6729 variants feature WDI functionality. The MAX6719UTLTD3+T is a triple-supply supervisor with RSTIN, MR, and open-drain RST - but no watchdog input or related timing circuitry.

What is the function of the RSTIN pin on the MAX6719UTLTD3+T?

The RSTIN pin on the MAX6719UTLTD3+T is a high-impedance input referenced to an internal 626.5mV bandgap voltage. When the voltage at RSTIN falls below this threshold, the device asserts RST. It enables supervision of a third supply (e.g., 1.2V or 1.8V) using an external resistor divider - a capability confirmed in the Functional Diagram and Detailed Description sections of the MAX6719UTLTD3+T datasheet.

Can the MAX6719UTLTD3+T operate with VCC1 below 1.8V?

Yes - the MAX6719UTLTD3+T guarantees valid reset output logic state as long as either VCC1 or VCC2 remains ≥ 0.8V. While VCC1 nominal range is 1.8V–5.0V, the device remains functional and asserts reset correctly down to 0.8V on either supply, enabling use in ultra-low-voltage brownout scenarios where other supervisors fail.

What package type and dimensions does the MAX6719UTLTD3+T use?

The MAX6719UTLTD3+T uses a 6-pin SOT23-6 package measuring 2.9mm × 1.6mm × 1.1mm (L × W × H), with gull-wing leads and RoHS-compliant lead-free finish (+T suffix). This package is identical to that used by MAX6715–MAX6722 variants and supports standard reflow profiles per JEDEC J-STD-020.