Analog Devices Inc./Maxim Integrated MAX6744XKSVD3+T

Overview

The MAX6744XKSVD3+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull reset output, VCC1 power-OK (POK1) output, and factory-trimmed reset thresholds of 2.925V (VCC1) and 2.188V (VCC2). It operates from -40°C to +85°C in a 5-pin SC70 package, draws only 6µA supply current, and provides a 150ms minimum reset timeout period-ideal for power-supply sequencing in portable multivoltage systems.

For engineers reviewing the MAX6744XKSVD3+T datasheet, MAX6744XKSVD3+T pinout, MAX6744XKSVD3+T application, or MAX6744XKSVD3+T equivalent, key selection criteria include its POK1 timing (37.5–75ms), dual fixed-threshold supervision, push-pull RESET drive capability, and compatibility with core/I/O supply sequencing requirements in battery-powered controllers and embedded processors.

Technical Context

The MAX6744XKSVD3+T monitors two independent supply rails (VCC1 and VCC2) using precision internal voltage references. Its POK1 output asserts high only after VCC1 exceeds 2.925V for ≥37.5ms, enabling controlled enablement of downstream regulators-critical for avoiding latch-up during power-up.

Reset assertion occurs when either VCC1 falls below 2.925V or VCC2 drops below 2.188V; the push-pull RESET output remains low for ≥150ms after both supplies recover. The device features no manual reset input (MR) or adjustable RSTIN-consistent with MAX6744's fixed dual-monitor architecture per Selector Guide and Pin Description.

Key Specifications

Pinout & Package

Package: 5-pin SC70 (1.6mm × 1.6mm, 0.95mm height, 0.65mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6741XKSVD3+T and TPS3808G33DBVR, the MAX6744XKSVD3+T uniquely combines push-pull RESET drive, factory-trimmed dual thresholds, and dedicated POK1 output in SC70-enabling simpler, smaller, and more reliable power sequencing in space-constrained multivoltage systems.

Availability

MAX6744XKSVD3+T is available at Aetrix Electronics and suitable for portable equipment, multivoltage systems, and notebook computers requiring stable component supply and long-term lifecycle support.

Supply support for MAX6744XKSVD3+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 management, sensing, and connectivity in demanding environments.

The MAX6736–MAX6745 family delivers ultra-low-power dual/triple-voltage supervision for portable and battery-operated systems where size, quiescent current, and sequencing accuracy are critical.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6744XKSVD3+T?

The MAX6744XKSVD3+T has a factory-trimmed VCC1 reset threshold of 2.925V, with ±0.075V tolerance over -40°C to +85°C. This value is confirmed in Table 1 of the datasheet under suffix "SY", and applies specifically to the MAX6744XKSVD3+T-not inferred from other variants. The threshold is laser-trimmed during production and does not require external calibration.

Does the MAX6744XKSVD3+T include a manual reset input (MR)?

No, the MAX6744XKSVD3+T does not include a manual reset input. Per the Pin Description table and Selector Guide, MAX6744 devices have RESET, GND, VCC2, POK1, and VCC1 pins-no MR terminal. This distinguishes it from MAX6736–MAX6739 and MAX6740–MAX6743 variants. The MAX6744XKSVD3+T relies solely on supply monitoring and POK1 sequencing.

What is the function of the POK1 pin on the MAX6744XKSVD3+T?

The POK1 pin on the MAX6744XKSVD3+T is an open-drain, active-high power-OK output that signals when VCC1 exceeds 2.925V for ≥37.5ms. It requires an external pullup resistor (typically 10kΩ to VCC1) and is used to enable downstream regulators-ensuring correct power-up sequence between I/O and core supplies. POK1 logic is independent of VCC2 and MR inputs.

Can the MAX6744XKSVD3+T monitor a 1.8V supply as VCC2?

No-the MAX6744XKSVD3+T has a fixed VCC2 threshold of 2.188V, optimized for 2.2V nominal supplies. Monitoring a 1.8V rail would cause premature reset assertion. For 1.8V core supervision, consider MAX6744 variants with suffix "SD" (VCC2 = 0.788V) or "SV" (VCC2 = 1.575V), or select MAX6738/MAX6739 with adjustable RSTIN input. The MAX6744XKSVD3+T's thresholds are immutable and factory-set.

What is the maximum sink current capability of the RESET output on the MAX6744XKSVD3+T?

The RESET output on the MAX6744XKSVD3+T is push-pull and can sink up to 1.2mA while maintaining VOL ≤ 0.4V (per Electrical Characteristics, VCC1 ≥ 2.38V, ISINK = 1.2mA). It can also source ≥500µA with VOH ≥ 0.8×VCC1. This eliminates need for external pullup resistors and ensures reliable reset assertion across process/voltage/temperature corners.