Analog Devices Inc./Maxim Integrated MAX6744XKRVD3

Overview

MAX6744XKRVD3 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 3.075V (VTH1) and 2.313V (VTH2). It monitors I/O and core supplies in multivoltage systems, asserts reset when either supply falls below its threshold, and maintains reset for ≥150ms after recovery. Designed for power-supply sequencing in portable and battery-powered equipment.

For engineers reviewing the MAX6744XKRVD3 datasheet, MAX6744XKRVD3 pinout, MAX6744XKRVD3 application, or MAX6744XKRVD3 equivalent, this page delivers verified specifications, SC70-5 package details, POK1 timing behavior, dual-threshold supervision logic, and validated alternative parts for sequencing-critical embedded designs.

Technical Context

The MAX6744XKRVD3 implements dual independent voltage monitoring with fixed thresholds on VCC1 (3.075V) and VCC2 (2.313V), both factory-trimmed over −40°C to +85°C. Its POK1 output deasserts high after VCC1 exceeds VTH1 for 37.5–75.0ms, enabling controlled VCC2 enablement without external timing components.

Reset assertion is synchronized across both monitored rails: RESET remains low until both VCC1 ≥ 3.075V and VCC2 ≥ 2.313V for ≥150ms (min), with internal timer restart on any subsequent threshold violation. The push-pull RESET output drives high to ≥0.8×VCC1 at 800µA source current and low to ≤0.4V at 3.2mA sink current.

Key Specifications

Pinout & Package

MAX6744XKRVD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height), optimized for space-constrained portable designs. 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 power-OK), 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 MAX6744XKRVD3, MAX6741XKRVD3 offers identical supervision thresholds and POK1 functionality but requires external pullup due to open-drain RESET, while TPS3808G33DBVR lacks dual-voltage support and sequencing features-making MAX6744XKRVD3 uniquely suited for coordinated I/O-core power management.

Availability

MAX6744XKRVD3 is available at Aetrix Electronics and suitable for power-supply sequencing, battery-powered equipment, and industrial controller applications requiring stable component supply, guaranteed −40°C to +85°C operation, and SC70-5 footprint compatibility.

Supply support for MAX6744XKRVD3 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 industrial and portable applications.

The MAX6736–MAX6745 family was engineered specifically for multivoltage microprocessor systems requiring compact, low-power supervision with sequencing support-addressing critical needs in notebook, GPS, and controller markets.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6744XKRVD3?

The MAX6744XKRVD3 has factory-trimmed reset thresholds of 3.075V ±75mV for VCC1 and 2.313V ±75mV for VCC2, as defined by the "RV" suffix in its part number. These values are guaranteed over the full −40°C to +85°C operating temperature range and do not require external calibration.

Does the MAX6744XKRVD3 support power-supply sequencing, and how does POK1 function?

Yes, the MAX6744XKRVD3 supports sequencing via its POK1 output. When VCC1 rises above 3.075V, POK1 remains low until VCC1 stays above threshold for 37.5–75.0ms, then goes high (open-drain, requires external pullup). This signal can directly enable a VCC2 DC/DC converter, ensuring strict I/O-before-core power-up order.

What is the reset timeout period for the MAX6744XKRVD3, and is it adjustable?

The MAX6744XKRVD3 uses the D3 timeout option, providing a guaranteed minimum reset timeout of 150ms and maximum of 300ms. This value is fixed by internal circuitry and not user-adjustable; alternative timing (e.g., 1200ms) requires the D7-suffixed variant (MAX6744XKRVD7).

Can the MAX6744XKRVD3 monitor a negative supply voltage?

No, the MAX6744XKRVD3 does not support direct negative voltage monitoring. Its VCC1, VCC2, and POK1 inputs are referenced to GND and operate only with positive supplies from 1.2V to 5.5V. Negative rail supervision requires external level-shifting circuitry or a dedicated comparator like the MAX6742/MAX6745.

What package type and pin count does the MAX6744XKRVD3 use?

The MAX6744XKRVD3 is supplied in a 5-pin SC70-5 package (1.6mm × 1.6mm body, 0.9mm max height). Pin 1 is RESET (push-pull), Pin 2 is GND, Pin 3 is VCC2, Pin 4 is POK1 (open-drain), and Pin 5 is VCC1-matching the pinout shown in Maxim's official datasheet Figure 15.