Analog Devices Inc./Maxim Integrated MAX6744XKYHD3

Overview

The MAX6744XKYHD3 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 monitors I/O and core supplies in multivoltage systems, asserts reset if 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 MAX6744XKYHD3 datasheet, MAX6744XKYHD3 pinout, MAX6744XKYHD3 application, or MAX6744XKYHD3 equivalent, this page delivers verified specifications, SC70-5 package details, POK1 timing behavior, dual-threshold supervision logic, and real-world sequencing use cases - all confirmed from Maxim's official datasheet (19-2531 Rev 2).

Technical Context

The MAX6744XKYHD3 implements independent dual-supply monitoring with precision voltage comparators referencing internal bandgap references (VTH1 = 2.925V, VTH2 = 2.188V), each with 0.5% hysteresis. Its POK1 output is an open-drain active-high signal tied solely to VCC1 status and deasserts only after VCC1 exceeds VTH1 for ≥37.5ms (tPOKP min).

Reset assertion is triggered by VCC1 < 2.925V, VCC2 < 2.188V, or MR low; reset remains asserted for ≥150ms (D3 timeout) after all conditions clear. The push-pull RESET output is referenced to VCC1 and drives high to ≥0.8×VCC1 at 800µA source current.

Key Specifications

Pinout & Package

MAX6744XKYHD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height), optimized for high-density portable PCB layouts. Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is VCC2, Pin 4 is POK1 (open-drain active-high), and Pin 5 is VCC1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6741XKYHD3, MAX6744XKYHD3 eliminates external pullup components via push-pull RESET; versus TPS3808G33DBVR, it provides POK-based sequencing and matched 2.925V/2.188V thresholds ideal for 3.0V/2.2V rail pairs in modern SoCs.

Availability

MAX6744XKYHD3 is available at Aetrix Electronics and suitable for power-supply sequencing, battery-powered controllers, and industrial edge controllers requiring stable component supply, guaranteed industrial temperature operation, and long-term production continuity.

Supply support for MAX6744XKYHD3 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) is a leader in precision analog, mixed-signal, and power-management ICs, serving industrial, automotive, communications, and consumer markets since 1983.

The MAX6736–MAX6745 family was designed specifically for low-power, space-constrained multivoltage systems requiring reliable reset generation and power-sequencing control - targeting portable electronics, embedded controllers, and IoT edge nodes.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6744XKYHD3?

The MAX6744XKYHD3 has factory-trimmed reset thresholds of 2.925V for VCC1 and 2.188V for VCC2, as defined by the "YH" suffix per Maxim's Table 1. These values are guaranteed over -40°C to +85°C with ±2.5% tolerance and 0.5% hysteresis, enabling precise supervision of 3.0V I/O and 2.2V core rails without external components.

Does the MAX6744XKYHD3 provide a power-OK (POK) output, and how is it used?

Yes, the MAX6744XKYHD3 features an open-drain POK1 output (Pin 4) that goes high only after VCC1 exceeds 2.925V for ≥37.5ms (tPOKP min). This signal is used to enable downstream regulators - for example, asserting POK1 to turn on a VCC2 DC/DC converter, ensuring strict I/O-before-core power-up sequencing in processors like NXP i.MX or ST STM32MP1.

What is the function of the RESET pin on the MAX6744XKYHD3, and what type of output does it have?

The RESET pin (Pin 1) on the MAX6744XKYHD3 is a push-pull active-low output that drives high to ≥0.8×VCC1 at 800µA source current. Unlike open-drain variants, it requires no external pullup resistor and interfaces directly with µP reset inputs - simplifying layout and eliminating risk of contention in bidirectional reset configurations.

How does the MAX6744XKYHD3 handle manual reset, and is there a dedicated MR pin?

The MAX6744XKYHD3 does not include a dedicated manual reset (MR) input pin. Per Maxim's Selector Guide and Pin Description, MR is absent on MAX6744/MAX6741; reset is triggered only by VCC1/VCC2 undervoltage or external assertion via the RESET pin. For manual reset capability, MAX6736–MAX6739 or MAX6740–MAX6743 variants must be selected instead.

What package type and dimensions does the MAX6744XKYHD3 use, and is it RoHS-compliant?

The MAX6744XKYHD3 uses a 5-pin SC70-5 package measuring 1.6mm × 1.6mm × 0.9mm. It is available in both leaded and lead-free versions; the "-T" suffix denotes standard leaded packaging, while "+T" indicates RoHS-compliant lead-free. The SC70-5 footprint supports high-density routing and reflow-compatible assembly per JEDEC J-STD-020.