Analog Devices Inc./Maxim Integrated MAX6736XKZWD3

Overview

The MAX6736XKZWD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.925V, VTH2 = 1.665V), open-drain active-low RESET output, manual reset input (MR), and 150ms minimum reset timeout period. It monitors primary I/O supply (VCC1) and secondary core supply (VCC2) in portable systems requiring precise power sequencing and low quiescent current (6µA). Used in battery-powered controllers and multivoltage embedded systems.

For engineers reviewing the MAX6736XKZWD3 datasheet, MAX6736XKZWD3 pinout, MAX6736XKZWD3 application, or MAX6736XKZWD3 equivalent, key selection criteria include dual fixed-threshold monitoring (2.925V/1.665V), SC70-5 package compatibility, -40°C to +85°C industrial temperature range, open-drain RESET with external pullup requirement, and MR-initiated reset with 150ms timeout.

Technical Context

The MAX6736XKZWD3 implements dual independent voltage monitoring circuits with precision internal references (±1.5% threshold accuracy over temperature), each triggering RESET assertion when its respective supply falls below its factory-set threshold. Its reset logic includes automatic timeout restart on threshold re-violation and guaranteed RESET validity down to VCC1 ≥ 1.2V.

It features an internal 1.5kΩ MR pullup resistor, supports CMOS-level or pushbutton-driven manual reset, and asserts RESET within 35µs of VCC1/VCC2 transient crossing the threshold. The open-drain RESET output requires external pullup and sinks up to 3.2mA at VCC1 ≥ 4.25V with VOL ≤ 0.4V.

Key Specifications

Pinout & Package

Package: 5-pin SC70 (2.0mm × 1.25mm, 0.65mm pitch), moisture sensitivity level 1, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316HUT46D3-T and TPS3808G18DBVR, the MAX6736XKZWD3 uniquely provides factory-matched dual thresholds (2.925V/1.665V) in SC70-5, enabling compact, reliable supervision of I/O+core architectures without external components or timing adjustments.

Availability

MAX6736XKZWD3 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 MAX6736XKZWD3 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, sensing, and connectivity applications.

The MAX6736–MAX6745 product line delivers ultra-low-power dual/triple-voltage supervisors optimized for battery-operated and space-constrained embedded systems requiring accurate, factory-trimmed reset thresholds and minimal board area.

FAQ

What are the exact reset threshold voltages for MAX6736XKZWD3?

The MAX6736XKZWD3 has factory-trimmed reset thresholds of VTH1 = 2.925V (for VCC1) and VTH2 = 1.665V (for VCC2), as defined by the "ZW" suffix per Table 1 in the datasheet. These values are guaranteed over the full -40°C to +85°C temperature range with ±1.5% tolerance, and the MAX6736XKZWD3 uses these precise thresholds to supervise dual-rail systems without external resistors.

Does MAX6736XKZWD3 require an external pullup resistor on the RESET pin?

Yes, the MAX6736XKZWD3 features an open-drain RESET output and requires an external pullup resistor to the appropriate logic rail (typically VCC1 or another system voltage). The datasheet specifies that the RESET pin sinks up to 3.2mA at VCC1 ≥ 4.25V with VOL ≤ 0.4V, so the pullup value must be selected to ensure proper logic-high voltage under load - commonly 10kΩ to 100kΩ depending on bus capacitance and speed requirements. This design is inherent to the MAX6736XKZWD3's open-drain architecture.

What is the function of the MR pin on MAX6736XKZWD3?

The MR (Manual Reset) pin on MAX6736XKZWD3 is an active-low input that forces the RESET output low when pulled below 0.3×VCC1 for ≥1µs. After release, RESET remains low for the full 150ms timeout period (D3 option). An internal 1.5kΩ pullup resistor to VCC1 allows direct connection to a momentary switch or microcontroller GPIO without external biasing - a key feature distinguishing the MAX6736XKZWD3 from single-supply alternatives.

Can MAX6736XKZWD3 monitor a 1.2V core supply?

No, the MAX6736XKZWD3 is not specified to monitor a 1.2V core supply. Its VCC2 input supports factory-trimmed thresholds down to 0.788V (suffix "D"), but the "ZW" suffix fixes VTH2 at 1.665V, and the minimum valid VCC2 operating voltage is 0.9V per datasheet specifications. For 1.2V core supervision, a different variant such as MAX6736XKSD3-T (VTH2 = 0.788V) or MAX6738 with RSTIN adjustment would be required - the MAX6736XKZWD3's fixed 1.665V threshold is incompatible with reliable 1.2V monitoring.

What package type and dimensions does MAX6736XKZWD3 use?

The MAX6736XKZWD3 uses a 5-pin SC70 package (also labeled SC70-5), measuring 2.0mm × 1.25mm with 0.65mm lead pitch. It is a surface-mount, lead-free compatible package with moisture sensitivity level 1 (MSL1), suitable for standard reflow soldering. This compact footprint is identical across the MAX6736–MAX6745 family and enables high-density placement in portable electronics - the MAX6736XKZWD3 leverages this package to deliver dual supervision in minimal board area.