Analog Devices Inc./Maxim Integrated MAX6741XKTGD3

Overview

The MAX6741XKTGD3 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 3.075V (VCC1) and 2.313V (VCC2), 150ms minimum reset timeout, and 6µA supply current. It monitors I/O and core supplies in portable multivoltage systems and asserts reset if either supply falls below its threshold.

For engineers reviewing the MAX6741XKTGD3 datasheet, MAX6741XKTGD3 pinout, MAX6741XKTGD3 application, or MAX6741XKTGD3 equivalent, key selection criteria include dual-supply monitoring with POK1 sequencing support, SC70-5 package compatibility, -40°C to +85°C operation, and precise factory-set thresholds for 3.3V/2.5V or 3.3V/1.8V rail combinations.

Technical Context

The MAX6741XKTGD3 implements two independent voltage comparators with internal 1.23V reference and resistor-divider scaling to generate precise VTH1 = 3.075V and VTH2 = 2.313V thresholds. Its POK1 output activates after VCC1 exceeds VTH1 for 37.5–75ms, enabling controlled power-up sequencing of VCC2.

Reset assertion is synchronized across both monitored rails with hysteresis of 0.5% and transient immunity up to 35µs at 100mV overdrive. The push-pull RESET output drives high to 0.8×VCC1 at 800µA, while POK1 requires an external pullup and asserts high only after VCC1 stabilization.

Key Specifications

Pinout & Package

MAX6741XKTGD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height) with gull-wing leads, optimized for space-constrained portable designs and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6744XKTGD3, the MAX6741XKTGD3 adds critical POK1 sequencing for VCC1-to-VCC2 enable control; versus TPS3808G33DBVR, it delivers dual-rail supervision and sequencing in the same SC70 footprint, eliminating design compromises in multivoltage systems.

Availability

MAX6741XKTGD3 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply and guaranteed long-term availability.

Supply support for MAX6741XKTGD3 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 in industrial, automotive, and consumer markets.

The MAX6736–MAX6745 product line delivers ultra-low-power dual/triple-voltage supervisors optimized for battery-operated and space-constrained multirail systems requiring reliable reset and power sequencing.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6741XKTGD3?

The MAX6741XKTGD3 has a factory-trimmed VCC1 reset threshold of 3.075V, with tolerance of ±75mV over the full -40°C to +85°C temperature range. This value is confirmed in Table 1 of the datasheet under suffix "T" for VCC1 and "Z" for VCC2, forming the "TZ" combination in the part number. The threshold remains stable due to internal 1.23V reference and laser-trimmed resistor network.

Does the MAX6741XKTGD3 support power-supply sequencing, and how is it implemented?

Yes, the MAX6741XKTGD3 supports power-supply sequencing via its open-drain POK1 output. When VCC1 rises above 3.075V and remains there for 37.5–75ms, POK1 deasserts high (with external pullup), enabling downstream control of VCC2. This ensures I/O rails stabilize before core power is applied-critical for processors requiring strict VCCIO-before-VCCINT sequencing. The MAX6741XKTGD3 implements this without external timing components.

What is the function of Pin 4 (POK1) on the MAX6741XKTGD3, and what external components does it require?

Pin 4 (POK1) is an open-drain active-high Power-OK output that signals VCC1 stability. It requires an external pullup resistor (typically 10kΩ to VCC1) to generate a logic-high level. Once VCC1 exceeds 3.075V for ≥37.5ms, POK1 transitions high to enable VCC2 regulators or other downstream circuitry. No capacitor or timing components are needed-the MAX6741XKTGD3 integrates the entire timing function internally.

How does the MAX6741XKTGD3 differ from the MAX6744XKTGD3 in terms of functionality and pinout?

The MAX6741XKTGD3 and MAX6744XKTGD3 share identical VCC1/VCC2 thresholds (3.075V/2.313V), 150ms timeout, and SC70-5 package, but differ in pin function: MAX6741XKTGD3 assigns Pin 4 to POK1 (open-drain high), while MAX6744XKTGD3 assigns Pin 4 to MR (manual reset input). Both use push-pull RESET on Pin 1. Thus, they are not pin-compatible; PCB layout must match the specific sequencing (MAX6741XKTGD3) or manual reset (MAX6744XKTGD3) requirement.

What is the supply current consumption of the MAX6741XKTGD3, and how does it vary with operating conditions?

The MAX6741XKTGD3 consumes ≤6µA total supply current across -40°C to +85°C, as specified in the Electrical Characteristics table. Typical ICC1 is 5–10µA at VCC1 = 3.3V or 1.8V, and ICC2 is 1–20µA depending on VCC2 voltage and load. This ultra-low current enables multi-year battery life in always-on applications like asset trackers and IoT sensors, with minimal impact on system power budget.