Analog Devices Inc./Maxim Integrated MAX6741XKWGD3+

Overview

MAX6741XKWGD3+ from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull RESET and open-drain VCC1 Power-OK (POK1) output, factory-trimmed reset thresholds of 1.665V (VCC1) and 0.788V (VCC2), 150ms minimum reset timeout, 6µA supply current, and SC70-5 package. It ensures reliable power-on reset and enables precise VCC1-to-VCC2 power-supply sequencing in portable multivoltage systems.

For engineers reviewing the MAX6741XKWGD3+ datasheet, MAX6741XKWGD3+ pinout, MAX6741XKWGD3+ application, or MAX6741XKWGD3+ equivalent, key selection criteria include its dual fixed-threshold monitoring, POK1 timing for sequencing control, low-quiescent-current operation, and compatibility with core/I/O rail sequencing requirements in battery-powered embedded controllers.

Technical Context

The MAX6741XKWGD3+ integrates two independent voltage monitors with factory-set thresholds (VTH1 = 1.665V, VTH2 = 0.788V), a 150ms reset timeout timer, and a dedicated open-drain POK1 output that asserts high only after VCC1 exceeds VTH1 for 37.5–75.0ms. Its internal logic guarantees RESET deassertion only when both VCC1 and VCC2 remain above their thresholds for the full tRP period.

It operates across -40°C to +85°C, draws ≤10µA total supply current (ICC1 + ICC2), supports VCC1 from 1.0V to 5.5V and VCC2 from 0.752V to 0.824V, and features 0.5% threshold hysteresis to reject noise-induced false resets on monitored rails.

Key Specifications

Pinout & Package

MAX6741XKWGD3+ uses a 5-pin SC70-5 package with exposed pad (not electrically connected). Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is VCC2 (secondary supply input), Pin 4 is POK1 (open-drain active-high), and Pin 5 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisor applications.

Compared with MAX6741XKWGD7+, the MAX6741XKWGD3+ provides faster system boot via shorter 150ms reset timeout; compared with TPS3808G18DBVR, it delivers integrated dual-rail supervision and hardware-enforced sequencing-eliminating external components and timing uncertainty in multivoltage designs.

Availability

MAX6741XKWGD3+ is available at Aetrix Electronics and suitable for portable multivoltage systems, notebook computer power management, and industrial controller power sequencing requiring stable component supply, guaranteed lead-free packaging, and full production traceability.

Supply support for MAX6741XKWGD3+ 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 management, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6736–MAX6745 product line delivers ultra-low-power dual/triple-voltage µP supervisors optimized for battery-operated and space-constrained multirail systems requiring accurate, sequenced power-up and brownout protection.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6741XKWGD3+?

The MAX6741XKWGD3+ has factory-trimmed reset thresholds of 1.665V for VCC1 (±0.045V over -40°C to +85°C) and 0.788V for VCC2 (±0.024V over temperature). These values are defined by the "W" and "D" suffixes per Maxim's Table 1 and are fully tested and guaranteed-not adjustable or user-configurable. The MAX6741XKWGD3+ does not include an RSTIN pin, so no external adjustment is possible.

Does the MAX6741XKWGD3+ support power-supply sequencing, and how is it implemented?

Yes, the MAX6741XKWGD3+ supports sequencing via its open-drain POK1 output. When VCC1 rises above 1.665V and remains there for 37.5–75.0ms (tPOKP), POK1 goes high (open-drain pulled up externally) and can be used to enable a downstream VCC2 regulator. This ensures VCC1 stabilizes before VCC2 powers up-critical for processors requiring I/O-before-core sequencing. The MAX6741XKWGD3+ implements this natively without external timing components.

What is the function of the POK1 pin on the MAX6741XKWGD3+, and what external components are needed?

The POK1 pin on the MAX6741XKWGD3+ is an open-drain active-high output signaling VCC1 validity. It requires an external pullup resistor (typically 10kΩ to VCC1 or system 3.3V) to generate a logic-high signal. No capacitor or timing components are needed-the 37.5–75.0ms assertion delay is internal. POK1 remains independent of MR, VCC2, and RESET states, making it ideal for clean, isolated sequencing control in the MAX6741XKWGD3+.

Can the MAX6741XKWGD3+ monitor a 0.9V core supply, and what is the lowest supported VCC2 voltage?

No-the MAX6741XKWGD3+ supports VCC2 thresholds down to 0.752V (min) per datasheet Absolute Maximum Ratings and Electrical Characteristics, but its factory-trimmed VCC2 threshold for the "D" suffix is fixed at 0.788V. A 0.9V rail exceeds the upper limit of its specified VCC2 monitoring range (0.752V–0.824V), so it cannot reliably detect undervoltage on a 0.9V supply. For 0.9V monitoring, a different variant (e.g., "F" suffix, VTH2 = 1.050V) or alternate supervisor would be required.

What is the supply current consumption of the MAX6741XKWGD3+, and how does it vary with voltage and temperature?

The MAX6741XKWGD3+ consumes 6µA typical total supply current (ICC1 + ICC2) at +25°C, with maximum 10µA over -40°C to +85°C. Per Typical Operating Characteristics (Fig. TOC01–TOC03), current remains stable across temperature and varies <10% from 1.0V to 5.5V VCC1. At VCC1 = 1.8V/VCC2 = 1.2V, total current is ~7µA at +85°C-confirming suitability for always-on battery applications where leakage must be minimized.