Analog Devices Inc./Maxim Integrated MAX6719UTSYD5-T

Overview

MAX6719UTSYD5-T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (1.575V threshold), VCC2 (2.625V threshold), and an externally adjustable RSTIN input (626.5mV reference) for auxiliary supply monitoring down to 0.62V. It asserts active-low open-drain reset with 420ms minimum timeout and guarantees valid reset output while either VCC1 or VCC2 remains ≥0.8V - critical for low-power portable systems during brownout recovery.

For engineers reviewing the MAX6719UTSYD5-T datasheet, MAX6719UTSYD5-T pinout, MAX6719UTSYD5-T application, or MAX6719UTSYD5-T equivalent, key selection criteria include dual-supply monitoring with third adjustable rail support, 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and guaranteed operation down to 0.8V supply - all validated for telecom, industrial, and battery-operated equipment.

Technical Context

The MAX6719UTSYD5-T implements independent voltage comparators for primary (VCC1), secondary (VCC2), and auxiliary (RSTIN) rails, each with factory-trimmed thresholds and 20ppm/°C tempco. Its reset logic combines OR-gated fault detection across all three inputs and enforces a fixed 420ms minimum timeout after all monitored voltages recover.

It features an open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, and no watchdog or power-fail functionality - confirmed by Selector Guide and Pin Configuration tables. The device operates over -40°C to +85°C and draws only 14µA typical supply current at 3.6V, enabling ultra-low-power system supervision.

Key Specifications

Pinout & Package

MAX6719UTSYD5-T uses a 6-pin SOT23-6 package with exposed pad (not electrically connected). All pins are surface-mount compatible and rated for reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSYD5-T and TPS3808G33DBVR, the MAX6719UTSYD5-T uniquely provides open-drain reset compatibility with bidirectional µP interfaces while retaining full triple-rail supervision - making it optimal for space-constrained, multivoltage embedded systems requiring robust brownout handling.

Availability

MAX6719UTSYD5-T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLCs, telecom line cards, and battery-operated instrumentation requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6719UTSYD5-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 interface applications, with leadership in supervisory, PMIC, and data-converter solutions.

The MAX6715–MAX6729 family delivers ultra-low-voltage, multirail microprocessor supervision in miniature SOT23 packages - engineered specifically for space- and power-constrained embedded systems demanding high reliability across industrial and portable environments.

FAQ

What is the exact reset threshold voltage for VCC1 on MAX6719UTSYD5-T?

The MAX6719UTSYD5-T has a factory-trimmed VCC1 reset threshold of 2.625V (typical), with guaranteed range 2.550V to 2.700V at +25°C. This value is fixed by the 'S' suffix in the part number and applies to falling-edge detection only. The threshold exhibits ±20ppm/°C tempco and maintains ±1.5% accuracy over the full -40°C to +85°C operating range. MAX6719UTSYD5-T datasheet Table 1 confirms this as the standard 'S' code for VCC1.

Does MAX6719UTSYD5-T include watchdog timer functionality?

No, MAX6719UTSYD5-T does not include watchdog timer functionality. Per the Selector Guide and Pin Description table, MAX6719UTSYD5-T is explicitly listed without WDI (watchdog input) support. Only MAX6721 through MAX6729 variants include watchdog capability. MAX6719UTSYD5-T provides triple-voltage supervision with manual reset (MR) and adjustable RSTIN input, but no watchdog timeout or WDI pin.

What is the function of the RSTIN pin on MAX6719UTSYD5-T?

The RSTIN pin on MAX6719UTSYD5-T is a high-impedance (±25nA) adjustable undervoltage monitor input with a precise 626.5mV internal reference. When the voltage at RSTIN falls below this threshold, the device asserts the RST output. Users set the monitored supply's trip point using an external resistor divider: V_{EXT_TH} = 626.5mV × ((R1 + R2)/R2). MAX6719UTSYD5-T supports monitoring down to 0.62V, enabling supervision of auxiliary rails like DDR termination or analog references.

What package type and pin count does MAX6719UTSYD5-T use?

MAX6719UTSYD5-T uses a 6-pin SOT23-6 package with gull-wing leads and an exposed thermal pad (non-functional). Pinout is standardized across the MAX6715–MAX6729 family: Pin 1 = RST (open-drain), Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1, Pin 6 = RSTIN. The '-T' suffix indicates tape-and-reel packaging; lead-free version uses '+T' ordering code.

How does MAX6719UTSYD5-T ensure reliable reset during low-voltage conditions?

MAX6719UTSYD5-T guarantees valid reset output logic state while either VCC1 or VCC2 remains ≥0.8V - verified across temperature and process corners. Below this voltage, internal biasing fails and reset behavior is undefined. For operation down to 0V, a 100kΩ pull-down resistor on RST is recommended (per datasheet Figure 10), though this applies only to push-pull variants. Since MAX6719UTSYD5-T has open-drain RST, external pullup is mandatory and sufficient for normal operation above 0.8V.