Analog Devices Inc./Maxim Integrated MAX6719UTTZD3+T

Overview

MAX6719UTTZD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in SOT23-6 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 MAX6719UTTZD3+T datasheet, MAX6719UTTZD3+T pinout, MAX6719UTTZD3+T application, or MAX6719UTTZD3+T equivalent, key selection factors 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, and push-pull active-low reset output referenced to VCC1.

Technical Context

The MAX6719UTTZD3+T implements independent voltage comparators for VCC1 and VCC2 with ±20ppm/°C tempco and 0.5% hysteresis, plus a high-impedance RSTIN input tied to a 626.5mV internal reference for externally adjustable third-supply monitoring. It asserts an active-low push-pull RST output when any monitored voltage falls below its threshold.

Reset assertion is sustained for a guaranteed minimum 210ms timeout after all supplies recover; the device remains functional with valid reset logic state even as VCC1 or VCC2 drops to 0.8V, enabling robust low-voltage operation in battery-backed or dynamically scaled systems.

Key Specifications

Pinout & Package

MAX6719UTTZD3+T uses a 6-pin SOT23-6 package with exposed pad (no thermal pad connection required). Pin 1 is RST (active-low push-pull reset output), Pin 2 is GND, Pin 3 is MR (active-low manual reset input with 50kΩ internal pullup to VCC1), Pin 4 is VCC2 (secondary supply input), Pin 5 is VCC1 (primary supply input), and Pin 6 is RSTIN (adjustable undervoltage comparator input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTTZD3+T and TPS3808G33DBVR, the MAX6719UTTZD3+T uniquely delivers factory-trimmed dual thresholds, RSTIN-adjustable third-supply monitoring, and push-pull reset in one SOT23-6 package - making it the only option for space-constrained triple-rail systems requiring zero external components on the reset path.

Availability

MAX6719UTTZD3+T is available at Aetrix Electronics and suitable for telecom power management, industrial multirail controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

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 was engineered specifically for multivoltage embedded systems needing compact, low-power, triple-supply supervision with guaranteed operation down to 0.8V - targeting telecom, computing, and portable equipment markets.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6719UTTZD3+T?

The MAX6719UTTZD3+T 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 encoded in the "TT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and verified in the Electrical Characteristics table of the official datasheet.

Does the MAX6719UTTZD3+T support watchdog timer functionality?

No, the MAX6719UTTZD3+T does not include a watchdog timer. Per the Selector Guide, only MAX6721 through MAX6729 variants integrate WDI functionality. The MAX6719UTTZD3+T is a triple-supply supervisor with RSTIN monitoring, manual reset (MR), and push-pull RST output - but no watchdog input or timeout logic.

What is the function of the RSTIN pin on the MAX6719UTTZD3+T and how is it configured?

The RSTIN pin on the MAX6719UTTZD3+T is a high-impedance input (±25nA leakage) tied to an internal 626.5mV reference voltage. To monitor a third supply, connect a resistor divider from that supply to GND with the midpoint at RSTIN. The trip voltage is calculated as V_{EXT_TH} = 626.5mV × (R1 + R2)/R2. Leave RSTIN unconnected or tie to VCC1/VCC2 if unused.

Can the MAX6719UTTZD3+T operate reliably when VCC1 drops below 1.0V?

Yes, the MAX6719UTTZD3+T guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V. This is explicitly specified in the Absolute Maximum Ratings and Detailed Description sections. Below 0.8V, reset behavior is not guaranteed - so system design must ensure VCC1 or VCC2 remains ≥0.8V during critical reset assertion/deassertion windows.

What package type and lead finish does MAX6719UTTZD3+T use?

The MAX6719UTTZD3+T uses a 6-pin SOT23-6 package with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix. It features gull-wing leads, 0.95mm pitch, and a body size of 2.9mm × 1.6mm × 1.1mm. No thermal pad is present, and standard SOT23 reflow profiles apply.