Analog Devices Inc./Maxim Integrated MAX6719UTYDD3-T

Overview

The MAX6719UTYDD3-T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in a 6-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and an externally adjustable RSTIN input down to 0.626V. It asserts an active-low open-drain reset output with 210ms minimum timeout, guarantees valid reset operation down to VCC1 or VCC2 = 0.8V, and supports manual reset and watchdog timer functions. It is used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6719UTYDD3-T datasheet, MAX6719UTYDD3-T pinout, MAX6719UTYDD3-T application, or MAX6719UTYDD3-T equivalent, key selection criteria include its dual-supply monitoring range (1.575V–4.625V on VCC1, 0.788V–3.075V on VCC2), 14µA typical supply current at 3.6V, 210ms reset timeout, open-drain RST output referenced to VCC1, and integrated RSTIN comparator with 626.5mV internal reference.

Technical Context

The MAX6719UTYDD3-T implements a dual-threshold voltage monitoring architecture: one factory-trimmed threshold for VCC1 (4.625V typical), another for VCC2 (3.075V typical), plus a high-impedance RSTIN input with 626.5mV internal reference for third-voltage supervision. Its reset logic combines OR-ed fault conditions - VCC1/VCC2 undervoltage, RSTIN undervoltage, or MR assertion - and holds reset active for a guaranteed minimum 210ms after all monitored voltages recover.

It integrates a dual-mode watchdog timer: 35s minimum startup period after reset, followed by 1.12s minimum normal timeout upon first WDI transition. The open-drain RST output requires an external pullup and remains functional down to VCC1 or VCC2 = 0.8V, supported by internal biasing that ensures correct logic state during low-voltage brownout recovery.

Key Specifications

Pinout & Package

MAX6719UTYDD3-T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, with gull-wing leads and standard thermal pad layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTYDD3-T, the MAX6719UTYDD3-T offers open-drain flexibility for shared reset buses but requires a pullup; compared with TPS3808G33DBVR, it delivers true triple-voltage supervision essential for heterogeneous power architectures, justifying its higher integration and pin count.

Availability

MAX6719UTYDD3-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, telecom line cards, and embedded networking switches requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed voltage thresholds.

Supply support for MAX6719UTYDD3-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 precision analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6715–MAX6729 family was designed specifically for space-constrained, multivoltage embedded systems needing reliable, low-power, factory-calibrated power-supply monitoring with minimal external components.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719UTYDD3-T?

The MAX6719UTYDD3-T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with a guaranteed range of 4.500V to 4.750V over temperature and supply variation. This value is encoded in the "YD" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6719UTYDD3-T, not the broader MAX6719 family.

Does the MAX6719UTYDD3-T support power-fail detection (PFI/PFO)?

No, the MAX6719UTYDD3-T does not include power-fail input (PFI) or power-fail output (PFO) functionality. Per the Selector Guide, only MAX6728/MAX6729 variants offer PFI/PFO. The MAX6719UTYDD3-T provides RSTIN for third-voltage monitoring but lacks the dedicated PFI comparator and PFO driver found in later family members.

What is the function of Pin 6 (RSTIN) on the MAX6719UTYDD3-T?

Pin 6 (RSTIN) on the MAX6719UTYDD3-T is a high-impedance input to an internal comparator referenced to a 626.5mV bandgap voltage. When the voltage at RSTIN falls below this threshold, the device asserts the RST output. It enables monitoring of a third supply (e.g., 0.9V, 1.2V, or 1.8V) using an external resistor divider, extending supervision beyond the fixed VCC1 and VCC2 rails.

Is the MAX6719UTYDD3-T pin-compatible with other MAX67xx SOT23-6 variants?

Yes, the MAX6719UTYDD3-T shares the same 6-pin SOT23-6 footprint and pinout with MAX6715–MAX6722 and MAX6723–MAX6727 SOT23-6 variants (e.g., MAX6716UTYDD3-T, MAX6720UTYDD3-T). However, functional differences exist - such as open-drain vs. push-pull RST, presence/absence of WDI or RSTIN - so electrical compatibility must be verified per application requirements.

What watchdog timeout periods does the MAX6719UTYDD3-T support?

The MAX6719UTYDD3-T supports a dual-mode watchdog timer: a 35s minimum startup timeout after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal timeout after the first valid edge on the WDI pin. This architecture prevents false timeouts during boot while ensuring rapid processor fault detection during steady-state operation.