Analog Devices Inc./Maxim Integrated MAX6719UTSFD1+T

Overview

MAX6719UTSFD1+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (1.8V–5.0V), VCC2 (0.9V–3.3V), and an externally adjustable third supply via RSTIN (threshold = 626.5 mV). It asserts active-low open-drain reset with 1.1 ms minimum timeout and guarantees valid reset output down to VCC1 or VCC2 = 0.8 V. Used in multivoltage embedded systems requiring reliable power sequencing and brownout detection.

For engineers reviewing the MAX6719UTSFD1+T datasheet, MAX6719UTSFD1+T pinout, MAX6719UTSFD1+T application, or MAX6719UTSFD1+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% typical), ultra-low 14 µA supply current at 3.6 V, RSTIN-adjustable third-voltage monitoring capability, and guaranteed operation over –40°C to +85°C industrial temperature range.

Technical Context

The MAX6719UTSFD1+T integrates three independent voltage monitors: two factory-trimmed thresholds for primary (VCC1) and secondary (VCC2) supplies, plus a high-impedance RSTIN input referenced to a 626.5 mV internal bandgap. Its reset logic combines OR-ed fault conditions - any monitored supply falling below threshold, MR assertion, or RSTIN undervoltage - triggering a single open-drain RST output held low for a fixed 1.1 ms minimum timeout period.

This device belongs to the MAX6715–MAX6729 family with BiCMOS process (1072 transistors), featuring immunity to short VCC transients (<20 µs at 100 mV overdrive), 20 ppm/°C reset threshold tempco, and guaranteed reset validity even when either VCC1 or VCC2 drops to 0.8 V - enabling robust operation during deep brownouts.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6, surface-mount, lead-free (+T suffix), 1.6 mm × 2.9 mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSFD1+T (push-pull RST) and TPS3808G33DBVR (dual-rail only), the MAX6719UTSFD1+T uniquely delivers open-drain reset flexibility plus factory-trimmed dual thresholds and RSTIN adjustability in one 6-pin SOT23 - making it optimal for space-constrained multivoltage systems needing configurable third-rail supervision.

Availability

MAX6719UTSFD1+T is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, medical portable devices, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6719UTSFD1+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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX6715–MAX6729 product line delivers ultra-low-voltage, triple-supply supervisory circuits optimized for space-constrained embedded systems requiring reliable power monitoring, brownout protection, and manual reset capability in minimal footprint.

FAQ

What is the exact reset timeout period for MAX6719UTSFD1+T?

The MAX6719UTSFD1+T has a minimum reset timeout period of 1.1 ms, as indicated by the "D1" suffix in its part number. This is a fixed, factory-programmed delay that begins when all monitored supplies rise above their respective thresholds and ends when the RST output deasserts. The actual timeout may vary slightly with temperature and supply voltage but remains ≥1.1 ms across the full –40°C to +85°C operating range.

Does MAX6719UTSFD1+T support monitoring a negative supply voltage?

Yes, MAX6719UTSFD1+T can monitor a negative supply using the RSTIN pin with an external resistor divider configured per Figure 3a/b in the datasheet. When the negative rail drops, RSTIN falls below 626.5 mV, asserting RST. Accuracy depends on resistor tolerance, PFI threshold variation (±1.5%), and VCC stability. No internal polarity inversion is provided - the circuit relies on external biasing.

What are the absolute maximum ratings for VCC1 and VCC2 on MAX6719UTSFD1+T?

The absolute maximum rating for both VCC1 and VCC2 pins on MAX6719UTSFD1+T is –0.3 V to +6.0 V with respect to GND. Exceeding these limits risks permanent damage. For normal operation, VCC1 must be between 0.8 V and 5.5 V, and VCC2 between 0.8 V and 5.5 V - though functional monitoring ranges are narrower: VCC1 = 1.8–5.0 V and VCC2 = 0.9–3.3 V per specification.

Can MAX6719UTSFD1+T be used without connecting the MR pin?

Yes, MAX6719UTSFD1+T can be used with MR unconnected. The device includes an internal 50 kΩ pullup resistor to VCC1, ensuring MR remains at logic high and does not assert reset unintentionally. If manual reset functionality is required, connect a normally open momentary switch from MR to GND; no external debounce components are needed due to built-in 100 ns glitch rejection.

How does the RSTIN input achieve 0.62 V minimum monitoring capability?

The RSTIN input of MAX6719UTSFD1+T references an internal 626.5 mV bandgap voltage. By configuring an external resistor divider (R1/R2) between the supply to be monitored and GND, with RSTIN connected to the divider midpoint, the trip point becomes V_{EXT_TH} = 626.5 mV × (R1 + R2)/R2. Selecting large R1/R2 values (e.g., 1 MΩ/100 kΩ) yields a 6.89 V threshold; reducing R2 to 10 kΩ gives ~6.89 V × (100 kΩ/10 kΩ) = 0.62 V - enabling sub-1 V rail supervision.