Analog Devices Inc./Maxim Integrated MAX6744XKZGD3

Overview

The MAX6744XKZGD3 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 2.313V (VTH1) and 2.188V (VTH2). It monitors I/O and core supply rails in multivoltage systems, asserts reset if either supply drops below its threshold, and maintains reset for ≥150ms after recovery. Designed for power-supply sequencing in portable and embedded controllers.

For engineers reviewing the MAX6744XKZGD3 datasheet, MAX6744XKZGD3 pinout, MAX6744XKZGD3 application, or MAX6744XKZGD3 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 MAX6744XKZGD3 implements independent dual-supply monitoring with precision factory-set thresholds (VTH1 = 2.313V, VTH2 = 2.188V) and a dedicated open-drain POK1 output referenced to VCC1. Its reset assertion is triggered by VCC1 < VTH1, VCC2 < VTH2, or MR low, with internal 150ms timeout (D3 suffix) and no restart inhibition during timeout.

POK1 activation follows VCC1 crossing VTH1 with a fixed 37.5–75.0ms delay (tPOKP), enabling controlled enablement of downstream regulators. The device uses BiCMOS process (249 transistors), operates from -40°C to +85°C, and draws only 5–10µA ICC1 at 1.8–3.3V, making it suitable for battery-backed systems requiring deterministic sequencing.

Key Specifications

Pinout & Package

MAX6744XKZGD3 is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable designs. Pin functions are validated per Maxim's Pin Description table and Pin Configurations diagram (page 15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6741XKZGD3, the MAX6744XKZGD3 offers direct push-pull reset drive eliminating external components, while TPS3808G33DBVR lacks both dual-supply capability and POK1 - making MAX6744XKZGD3 uniquely suited for compact, sequenced multivoltage designs.

Availability

MAX6744XKZGD3 is available at Aetrix Electronics and suitable for portable medical sensors, notebook I/O power sequencing, and industrial PLC controllers requiring stable component supply, guaranteed -40°C to +85°C operation, and ultra-low 6µA quiescent current.

Supply support for MAX6744XKZGD3 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.

The MAX6736–MAX6745 family was designed specifically for low-power, space-constrained multivoltage systems requiring deterministic reset and power-sequencing - targeting portable, battery-operated, and embedded controller markets.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6744XKZGD3?

The MAX6744XKZGD3 has factory-trimmed reset thresholds of 2.313V for VCC1 and 2.188V for VCC2, as defined by the "ZG" suffix per Maxim's Table 1. These values are guaranteed over -40°C to +85°C with ±1.5% tolerance and include built-in hysteresis (0.5%) to prevent chatter during threshold crossings.

Does the MAX6744XKZGD3 provide power-OK functionality, and how is it implemented?

Yes, the MAX6744XKZGD3 features a dedicated open-drain POK1 output (Pin 4) that remains low until VCC1 exceeds 2.313V for 37.5–75.0ms (tPOKP). This signal is used to enable downstream regulators - for example, holding VCC2 off until VCC1 is stable - enabling reliable I/O-before-core power sequencing.

What is the reset output type of the MAX6744XKZGD3, and how does it interface with microprocessors?

The MAX6744XKZGD3 has a push-pull active-low RESET output (Pin 1), eliminating the need for an external pullup resistor. It can drive µP reset pins directly; for bidirectional reset I/O ports, a 4.7kΩ series resistor is recommended to prevent contention, as documented in Maxim's Figure 5.

What is the guaranteed reset timeout period for the MAX6744XKZGD3, and is it adjustable?

The MAX6744XKZGD3 has a fixed minimum reset timeout period of 150ms (tRP), indicated by the "D3" suffix. This value is not user-adjustable - it is internally trimmed and guaranteed across temperature and voltage. The timeout begins only after all monitored supplies exceed their thresholds and is not inhibited by subsequent dips.

What package type and dimensions does the MAX6744XKZGD3 use, and what are its assembly requirements?

The MAX6744XKZGD3 uses a 5-pin SC70-5 package measuring 2.0mm × 1.25mm with 0.65mm lead pitch. It is compatible with standard Pb-free reflow profiles (JEDEC J-STD-020), requires no special stencil design, and supports automated pick-and-place. Thermal pad is not present; standard SC70 land pattern applies.