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 (primary supply), VCC2 (secondary supply), 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 and portable equipment for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6719UTSDD3 datasheet, MAX6719UTSDD3 pinout, MAX6719UTSDD3 application, or MAX6719UTSDD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), ultra-low 14µA typical supply current at 3.6V, RSTIN adjustable monitoring down to 0.626V, push-pull reset output referenced to VCC1, and immunity to sub-20µs VCC transients.

Technical Context

The MAX6719UTSDD3 implements independent voltage comparators for VCC1 and VCC2 with 20ppm/°C tempco and 0.5% hysteresis, plus a dedicated high-impedance RSTIN input with 626.5mV internal reference and ±25nA input current. It asserts an active-low push-pull RST output when any monitored voltage falls below its threshold and holds reset for a guaranteed minimum 210ms after all supplies recover.

This device integrates manual reset (MR) with 50kΩ internal pullup and 200ns MR-to-reset delay, but excludes watchdog timer and power-fail I/O - confirmed by Selector Guide entry for MAX6719 as "3 monitors, 1 open-drain RST, manual reset only". Its operation is validated across -40°C to +85°C with full functionality at VCC ≥ 0.8V.

Key Specifications

Pinout & Package

MAX6719UTSDD3 is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), lead-free, with gull-wing leads and standard JEDEC MO-178 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSDD3 and TPS3808G33DBVR, the MAX6719UTSDD3 uniquely delivers factory-trimmed triple-voltage supervision with push-pull RST in a 6-pin SOT23, enabling compact, low-component-count designs for multirail systems without external pullups or additional comparators.

Availability

MAX6719UTSDD3 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC modules, portable medical monitors, and battery-powered edge gateways requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across temperature.

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 industrial, communications, and computing markets.

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

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6719UTSDD3?

The MAX6719UTSDD3 has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C operating range. These values are fixed by the "TD" suffix in the part number and verified per the Reset Voltage Threshold Suffix Guide in the datasheet. The MAX6719UTSDD3 does not support user-adjustable VCC1/VCC2 thresholds - only RSTIN is externally adjustable.

Does MAX6719UTSDD3 include a watchdog timer function?

No, the MAX6719UTSDD3 does not include a watchdog timer. According to the Selector Guide, MAX6719 is explicitly listed with "√" under Manual Reset and "-" under Watchdog Input. The device provides only voltage monitoring (VCC1, VCC2, RSTIN), manual reset (MR), and push-pull RST output - no WDI pin or watchdog timeout circuitry is present in the MAX6719UTSDD3 silicon.

Can MAX6719UTSDD3 monitor a 1.2V supply using the RSTIN pin?

Yes, the MAX6719UTSDD3 can monitor a 1.2V supply using RSTIN by connecting an external resistor divider. With a 626.5mV internal reference, a divider ratio of R1/R2 = (1.2V / 0.6265V) − 1 ≈ 0.914 achieves trip at 1.2V. For example, R2 = 100kΩ and R1 = 91.4kΩ yields V_{EXT_TH} = 626.5mV × (191.4kΩ / 100kΩ) ≈ 1.20V. The MAX6719UTSDD3's ±25nA RSTIN input current ensures minimal error from divider loading.

What is the maximum allowable voltage on the RSTIN pin of MAX6719UTSDD3?

The absolute maximum rating for RSTIN is -0.3V to +6V with respect to GND, per the Absolute Maximum Ratings table. However, for functional operation, RSTIN must remain within 0V to VCC1 or VCC2 (whichever is higher), as the internal comparator reference is derived from the supply rails. Exceeding VCC by more than 0.3V risks latch-up or damage. The MAX6719UTSDD3 datasheet specifies RSTIN operation only within the valid supply range - never above VCC1 or VCC2.

Is MAX6719UTSDD3 pin-compatible with other devices in the MAX6715–MAX6729 family?

Yes, the MAX6719UTSDD3 is pin-compatible with all 6-pin SOT23 variants in the MAX6715–MAX6729 family (e.g., MAX6715UTxxDx-T, MAX6716UTxxDx-T, MAX6720UTxxDx-T), sharing identical pin 1–6 assignments: RST, GND, MR, VCC2, VCC1, RSTIN. This allows drop-in replacement for different threshold or output configurations - though functional compatibility (e.g., push-pull vs. open-drain RST) must be verified per application requirements.