Analog Devices Inc./Maxim Integrated MAX6719UTSDD3+

Overview

MAX6719UTSDD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (1.575V threshold), VCC2 (0.788V threshold), and an externally adjustable RSTIN input (626.5mV reference) with 210ms minimum reset timeout. It asserts active-low open-drain reset during undervoltage on any monitored rail and maintains reset for the full timeout after recovery - critical for reliable boot sequencing in multivoltage embedded systems.

For engineers reviewing the MAX6719UTSDD3+ datasheet, MAX6719UTSDD3+ pinout, MAX6719UTSDD3+ application, or MAX6719UTSDD3+ equivalent, key selection factors include its guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, immunity to short VCC transients, and support for manual reset, watchdog timer (35s startup / 1.12s normal mode), and auxiliary voltage monitoring via RSTIN.

Technical Context

The MAX6719UTSDD3+ integrates dual factory-trimmed voltage comparators (VTH1 = 1.575V, VTH2 = 0.788V) and a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic combines OR-ed fault detection across all three inputs and enforces a fixed 210ms (min) timeout using an internal RC timer.

It features an open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, and watchdog functionality with dual-mode timing: 35s minimum initial period post-reset and 1.12s minimum normal timeout after first WDI edge - enabling robust processor activity monitoring without false triggers during boot.

Key Specifications

Pinout & Package

MAX6719UTSDD3+ uses a 6-pin SOT23-6 package with exposed pad (thermal performance optimized). Pin 1 is RST (open-drain active-low reset), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is VCC2 (secondary supply input), Pin 5 is RSTIN (adjustable monitor input), and Pin 6 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSDD3+, the MAX6719UTSDD3+ provides open-drain flexibility for bidirectional reset interfaces but requires external pullup; versus TPS3808G33DBVR, it adds essential RSTIN-based third-rail monitoring at the cost of higher supply current - making it the only viable option for true triple-supply integrity assurance.

Availability

MAX6719UTSDD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical patient monitors, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6719UTSDD3+ 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 demanding industrial, communications, and computing applications.

The MAX6715–MAX6729 family was designed specifically for multivoltage microprocessor systems needing compact, low-power, triple-rail supervision with guaranteed operation down to 0.8V supply - addressing reliability gaps in legacy dual-supervisor architectures.

FAQ

What is the exact reset threshold voltage for VCC1 on MAX6719UTSDD3+?

The MAX6719UTSDD3+ has a factory-trimmed VCC1 reset threshold of 1.575V (typical), with tolerance of ±1.5% (1.530V to 1.620V) over temperature. This value is fixed by the "TS" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies regardless of VCC2 level or RSTIN state.

Does MAX6719UTSDD3+ support watchdog functionality?

Yes, MAX6719UTSDD3+ includes a dual-mode watchdog timer: a 35s minimum startup period after any reset event, followed by a 1.12s minimum normal timeout period triggered by the first valid edge on the WDI pin. The WDI pin is present and functional on this variant per the Selector Guide.

What is the purpose of the RSTIN pin on MAX6719UTSDD3+?

The RSTIN pin on MAX6719UTSDD3+ is a high-impedance input referenced to a 626.5mV internal bandgap voltage. It enables monitoring of a third system voltage (e.g., 1.1V, 2.5V) using an external resistor divider, extending supervision beyond the fixed VCC1/VCC2 rails - a defining feature distinguishing MAX6719UTSDD3+ from dual-supply variants.

What package type and pin count does MAX6719UTSDD3+ use?

MAX6719UTSDD3+ uses a 6-pin SOT23-6 package with exposed thermal pad. Pinout is standardized across the MAX6715–MAX6729 family: Pin 1 = RST (open-drain), Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = RSTIN, Pin 6 = VCC1 - confirmed in the Pin Configurations section of the datasheet.

Is MAX6719UTSDD3+ compatible with 0.8V supply operation?

Yes, MAX6719UTSDD3+ guarantees correct reset output logic state (valid high/low assertion) when either VCC1 or VCC2 remains ≥ 0.8V. This specification is explicitly tested and guaranteed - enabling reliable operation during deep brownout conditions where other supervisors may fail unpredictably.