Analog Devices Inc./Maxim Integrated MAX6719UTTZD3-T

Overview

MAX6719UTTZD3-T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and an externally adjustable RSTIN input down to 0.626V. It asserts an active-low open-drain reset output when any monitored supply falls below its threshold, maintains reset for a guaranteed minimum 210ms timeout, and operates over -40°C to +85°C in 6-pin SOT23. It is used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6719UTTZD3-T datasheet, MAX6719UTTZD3-T pinout, MAX6719UTTZD3-T application, or MAX6719UTTZD3-T equivalent, key selection criteria include dual/third-supply monitoring capability, 210ms reset timeout, 0.626V RSTIN reference, open-drain RST output, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V.

Technical Context

The MAX6719UTTZD3-T integrates three independent voltage comparators: one for VCC1 (factory-trimmed threshold), one for VCC2 (factory-trimmed threshold), and one for RSTIN referenced to a 626.5mV internal bandgap. Its reset logic combines ORed fault detection with a monostable timeout circuit ensuring minimum 210ms assertion after all supplies recover.

It features a manual reset input (MR) with 50kΩ internal pullup to VCC1, supports noise-immune operation via 100ns MR glitch rejection, and guarantees correct reset state even when VCC1 or VCC2 drops to 0.8V - enabling robust low-voltage system supervision without external biasing.

Key Specifications

Pinout & Package

MAX6719UTTZD3-T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free capable. Pin 1 is marked with a dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTTZD3-T, MAX6719UTTZD3-T offers open-drain flexibility for mixed-voltage reset buses but requires a pullup; compared with TPS3808G33DBVR, it adds essential RSTIN-based third-supply supervision at the cost of slightly higher complexity.

Availability

MAX6719UTTZD3-T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, and portable medical sensors requiring stable component supply, long-lifecycle support, and guaranteed factory-trimmed voltage thresholds.

Supply support for MAX6719UTTZD3-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 and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on high-reliability industrial and communications solutions.

The MAX6715–MAX6729 family delivers ultra-low-voltage, multirail supervisory circuits optimized for space-constrained, battery-sensitive, and multivoltage embedded systems where deterministic reset behavior is mission-critical.

FAQ

What is the exact reset timeout period for MAX6719UTTZD3-T?

The MAX6719UTTZD3-T has a minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This is a factory-programmed, temperature-compensated delay ensuring consistent reset hold time across -40°C to +85°C. The actual timeout is typically 210ms at +25°C and varies within ±25% over temperature per datasheet specifications. This value applies regardless of which input (VCC1, VCC2, or RSTIN) triggers the reset event.

Does MAX6719UTTZD3-T support monitoring a 1.2V supply as the third voltage?

Yes, MAX6719UTTZD3-T supports monitoring a 1.2V supply via its RSTIN pin using an external resistor divider. With a 626.5mV internal reference, a 1.2V rail can be scaled to match the threshold by selecting R1 and R2 such that V_{EXT_TH} = 626.5mV × (R1 + R2)/R2. For example, R1 = 910kΩ and R2 = 1MΩ yields ~1.2V trip point. The RSTIN input draws only ±25nA, enabling high-value resistors to minimize power loss.

Can MAX6719UTTZD3-T operate with VCC1 = 1.8V and VCC2 = 1.2V simultaneously?

Yes, MAX6719UTTZD3-T is fully specified to operate with VCC1 as low as 1.8V and VCC2 as low as 0.9V. Its internal comparators and logic remain functional across this range, and the reset output is guaranteed valid as long as either VCC1 or VCC2 remains ≥0.8V. At these voltages, the device draws only ~10µA total supply current, making it ideal for low-power dual-rail applications like portable instrumentation.

Is the MR input on MAX6719UTTZD3-T internally pulled up?

Yes, the MR input on MAX6719UTTZD3-T includes a factory-trimmed 50kΩ internal pullup resistor to VCC1. This allows MR to be left unconnected when unused, simplifying PCB layout. When actively driven, MR accepts TTL- or CMOS-compatible logic levels (V_IL ≤ 0.3×VCC1, V_IH ≥ 0.7×VCC1) and rejects glitches shorter than 100ns. MR assertion forces reset for the full 210ms timeout, even if released early.

What package type and dimensions does MAX6719UTTZD3-T use?

MAX6719UTTZD3-T uses a 6-pin SOT23-6 package measuring 2.9mm × 1.6mm × 1.1mm (L × W × H) with standard gull-wing leads. It is RoHS-compliant and available in both leaded and lead-free versions (the "-T" suffix denotes lead-free). The package supports reflow soldering per JEDEC J-STD-020 and is compatible with automated pick-and-place assembly.