Analog Devices Inc./Maxim Integrated MAX6744XKZWD3

Overview

MAX6744XKZWD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with push-pull RESET output, VCC1 Power-OK (POK1) open-drain output, and factory-trimmed reset thresholds of 2.313V (VTH1) and 1.665V (VTH2). It monitors I/O and core supply rails 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 MAX6744XKZWD3 datasheet, MAX6744XKZWD3 pinout, MAX6744XKZWD3 application, or MAX6744XKZWD3 equivalent, key selection criteria include its dual fixed-threshold supervision, POK1 timing (37.5–75ms), 6µA supply current, SC70-5 package footprint, and guaranteed operation from –40°C to +85°C.

Technical Context

The MAX6744XKZWD3 implements independent dual-voltage monitoring with precision factory-set thresholds (VTH1 = 2.313V, VTH2 = 1.665V) and a dedicated VCC1 Power-OK (POK1) output. Its internal timeout logic ensures POK1 deasserts only after VCC1 exceeds VTH1 for ≥37.5ms, enabling controlled enablement of downstream supplies like VCC2.

Reset assertion is triggered by VCC1 < 2.313V, VCC2 < 1.665V, or MR low; RESET remains active for ≥150ms after all monitored voltages recover. The push-pull RESET output drives high to ≥0.8×VCC1 (ISOURCE = 800µA) and low to ≤0.4V (ISINK = 3.2mA), eliminating need for external pullup.

Key Specifications

Pinout & Package

MAX6744XKZWD3 is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6744XKZWD3, MAX6741XKZWD3 trades push-pull convenience for open-drain flexibility, while TPS3808G18DBVR reduces current draw but sacrifices dual-supply supervision and POK1 sequencing-making MAX6744XKZWD3 uniquely suited for compact, sequenced dual-rail designs.

Availability

MAX6744XKZWD3 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 MAX6744XKZWD3 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 interface applications.

The MAX6736–MAX6745 family delivers ultra-low-power dual/triple-voltage µP supervisors targeting portable, battery-operated, and space-constrained embedded systems requiring reliable power monitoring and sequencing.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6744XKZWD3?

The MAX6744XKZWD3 has a factory-trimmed VCC1 reset threshold (VTH1) of 2.313V, with tolerance of ±0.100V over the full –40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the datasheet under suffix "ZW" and applies specifically to the MAX6744XKZWD3 variant-not inferred from other members of the MAX6736–MAX6745 family.

Does the MAX6744XKZWD3 provide a manual reset input (MR)?

No, the MAX6744XKZWD3 does not include a manual reset (MR) input. Per the Selector Guide and Pin Description table, MAX6744 devices feature POK1 and dual fixed thresholds but omit MR-unlike MAX6736–MAX6739 variants. The MAX6744XKZWD3 relies solely on supply monitoring and POK1 sequencing, with no provision for external reset initiation.

What is the function of the POK1 pin on the MAX6744XKZWD3?

The POK1 pin on the MAX6744XKZWD3 is an open-drain active-high Power-OK output that signals VCC1 stability. It remains low until VCC1 exceeds its 2.313V threshold for ≥37.5ms (tPOKP), then goes high (with external pullup) to enable downstream circuitry-enabling precise VCC1-to-VCC2 power-supply sequencing in dual-rail systems.

Is the RESET output of the MAX6744XKZWD3 push-pull or open-drain?

The RESET output of the MAX6744XKZWD3 is push-pull active-low. As confirmed in the Selector Guide and Pin Description, MAX6744 devices use push-pull RESET-unlike MAX6736/MAX6738 which use open-drain. This allows direct connection to µP reset pins without external pullup resistors, simplifying design and reducing component count.

What package type and dimensions does the MAX6744XKZWD3 use?

The MAX6744XKZWD3 uses a 5-pin SC70-5 package measuring 2.0mm × 1.25mm with 0.65mm lead pitch. This ultra-small outline is specified in the Ordering Information section and Pin Configurations diagram, and is consistent across all MAX6736–MAX6745 variants offered in SC70 packaging.