Analog Devices Inc./Maxim Integrated MAX6719UTSFD2+

Overview

MAX6719UTSFD2+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 4.625V and 3.075V, 210ms reset timeout, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in multivoltage telecom power systems for reliable brownout detection and system initialization.

For engineers reviewing the MAX6719UTSFD2+ datasheet, MAX6719UTSFD2+ pinout, MAX6719UTSFD2+ application, or MAX6719UTSFD2+ equivalent, key selection concerns include dual-supply threshold accuracy (±1.5% over temperature), RSTIN's 626.5mV internal reference for auxiliary voltage monitoring, push-pull reset output compatibility with 3.3V/5V µP interfaces, and immunity to sub-20µs VCC transients.

Technical Context

The MAX6719UTSFD2+ implements independent dual-threshold comparators for VCC1 and VCC2, plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap, enabling precise monitoring of a third supply as low as 0.62V via external resistor divider. Its reset logic asserts active-low RST on any threshold violation and holds for a factory-set 210ms minimum timeout.

It integrates a manual reset input (MR) with 50kΩ internal pullup to VCC1, supports watchdog-free operation, and guarantees valid reset state when either VCC1 or VCC2 ≥ 0.8V - critical for low-voltage battery-backed systems where supply collapse must trigger deterministic reset before logic corruption occurs.

Key Specifications

Pinout & Package

MAX6719UTSFD2+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSFD2+, MAX6719UTSFD2+ provides direct-drive reset capability without external components; versus TPS3808G33DBVR, it adds essential RSTIN flexibility for systems requiring triple-supply validation - making it optimal for compact multivoltage designs where board space and functional completeness are critical.

Availability

MAX6719UTSFD2+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical diagnostics requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for MAX6719UTSFD2+ 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 demanding industrial, communications, and computing applications.

The MAX6715–MAX6729 family was designed specifically for space-constrained multivoltage systems needing reliable, low-quiescent-current supervision of primary, secondary, and auxiliary supplies - with emphasis on factory-trimmed accuracy and robust reset timing.

FAQ

What are the exact factory-trimmed reset thresholds for MAX6719UTSFD2+?

The MAX6719UTSFD2+ has factory-trimmed VCC1 and VCC2 reset thresholds of 4.625V and 3.075V respectively, with ±1.5% tolerance over -40°C to +85°C. These values are encoded in the "TS" suffix per Maxim's Reset Voltage Threshold Suffix Guide and confirmed in the Electrical Characteristics table of the official datasheet. The RSTIN input uses a fixed 626.5mV internal reference.

Does MAX6719UTSFD2+ include a watchdog timer?

No, MAX6719UTSFD2+ does not include a watchdog timer. Per the Selector Guide and Functional Diagram in the datasheet, only MAX6721–MAX6729 variants integrate WDI functionality. The MAX6719UTSFD2+ is a triple-supply supervisor with manual reset (MR), RSTIN monitoring, and push-pull RST output - but no watchdog input or timeout logic.

What is the reset timeout period of MAX6719UTSFD2+ and how is it set?

The MAX6719UTSFD2+ has a factory-set minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This value is fixed and non-adjustable - derived from internal RC timing and guaranteed over temperature. It is not configurable via external components or pins, and appears in the Reset Timeout Period Suffix Guide as D3 = 210ms (min).

Can MAX6719UTSFD2+ monitor a negative supply voltage?

Yes, MAX6719UTSFD2+ can monitor a negative supply using the RSTIN input with an appropriate resistor-divider network, as shown in Figure 3b of the datasheet. When configured this way, RSTIN detects when the negative rail rises toward zero (i.e., fails), causing RST to assert. Accuracy depends on R1/R2 matching and PFI threshold tolerance, but the 626.5mV reference remains valid regardless of polarity.

Is MAX6719UTSFD2+ pin-compatible with other MAX67xx devices in SOT23-6?

MAX6719UTSFD2+ shares the same 6-pin SOT23-6 footprint and pinout with MAX6715/16/19/20/21/22/23/24, as confirmed in the Pin Description table. However, functional compatibility requires verification: MAX6719UTSFD2+ has RSTIN on pin 6 and push-pull RST on pin 1, whereas MAX6715 lacks RSTIN and MAX6720 has open-drain RST - so electrical behavior differs despite mechanical compatibility.