Analog Devices Inc./Maxim Integrated MAX6737XKTZD3

Overview

The MAX6737XKTZD3 from Maxim Integrated is a dual fixed-voltage microprocessor supervisor IC in SC70-5 package, monitoring VCC1 and VCC2 supply rails with factory-trimmed thresholds of 3.075V and 2.313V respectively, featuring push-pull active-low RESET output, manual reset input (MR), and 150ms minimum reset timeout period. It ensures reliable power-on reset and brownout detection in portable battery-powered systems requiring low quiescent current (6µA) and compact footprint.

For engineers reviewing the MAX6737XKTZD3 datasheet, MAX6737XKTZD3 pinout, MAX6737XKTZD3 application, or MAX6737XKTZD3 equivalent, key selection criteria include confirmed dual-supply monitoring capability, push-pull RESET drive strength (VOH ≥0.8×VCC1, VOL ≤0.4V at 3.2mA), MR input pullup impedance (0.75–3.0kΩ to VCC1), -40°C to +85°C operation, and SC70-5 thermal performance (247mW at +70°C).

Technical Context

The MAX6737XKTZD3 implements independent voltage comparators for VCC1 and VCC2, each referenced to precision internal bandgap-derived thresholds (±1.5% over temperature). Reset assertion occurs when either supply falls below its threshold, and deassertion requires both supplies to remain above thresholds for the full 150ms timeout - with timer restart on any subsequent undervoltage event.

Its push-pull RESET output eliminates external pullup requirements and supports direct interfacing to CMOS inputs, while the dedicated MR pin features internal 1.5kΩ pullup and 150ms timeout after release, enabling robust momentary switch-based reset initiation without external debounce circuitry.

Key Specifications

Pinout & Package

Package: 5-pin SC70-5 (2.0mm × 1.25mm × 0.95mm, 0.65mm pitch), surface-mount, lead-free compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with MAX6736XKTZD3 and TPS3808G33DBVR, the MAX6737XKTZD3 uniquely delivers dual-rail supervision with push-pull RESET in SC70-5-enabling smaller BOM, faster reset release, and guaranteed coordination between I/O and core supply stability.

Availability

MAX6737XKTZD3 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply, long-term lifecycle support, and consistent factory-trimmed voltage thresholds.

Supply support for MAX6737XKTZD3 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 in industrial, automotive, and consumer markets.

The MAX6736–MAX6745 family was engineered specifically for low-power dual- and triple-voltage microprocessor supervision in space-constrained portable electronics, emphasizing ultra-low IQ, factory-trimmed accuracy, and minimal external components.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6737XKTZD3?

The MAX6737XKTZD3 has factory-trimmed reset thresholds of 3.075V for VCC1 and 2.313V for VCC2, as indicated by the "TZ" suffix per Table 1 in the datasheet. These values are specified over -40°C to +85°C with ±1.5% tolerance and enable precise monitoring of standard 3.3V I/O and 2.5V core rails. The MAX6737XKTZD3 does not support adjustable thresholds.

Does the MAX6737XKTZD3 require an external pullup resistor on the RESET pin?

No, the MAX6737XKTZD3 features a push-pull RESET output, eliminating the need for an external pullup resistor. Its output actively drives high (VOH ≥0.8×VCC1) and low (VOL ≤0.4V at 3.2mA), making it compatible with direct connection to CMOS reset inputs. This distinguishes the MAX6737XKTZD3 from open-drain variants like MAX6736XKTZD3.

What is the function and timing behavior of the MR pin on the MAX6737XKTZD3?

The MR pin on the MAX6737XKTZD3 is an active-low manual reset input with an internal 1.5kΩ pullup to VCC1. When pulled low for ≥1µs, it forces RESET low immediately and holds it for 150ms after MR returns high. This enables reliable pushbutton reset without external debounce components. The MAX6737XKTZD3 MR functionality is identical across all D3-timed variants.

Can the MAX6737XKTZD3 monitor a 1.8V core supply?

Yes, the MAX6737XKTZD3 monitors VCC2 over 0.9V to 3.3V, and its 2.313V threshold is appropriate for supervising a 2.5V core rail. For a 1.8V core, the MAX6737XKTZD3 is not suitable - instead, select a variant with lower VCC2 threshold (e.g., "TW" = 1.665V or "TI" = 1.388V suffix). The MAX6737XKTZD3's fixed thresholds cannot be adjusted externally.

Is the MAX6737XKTZD3 RoHS-compliant and available in lead-free packaging?

Yes, the MAX6737XKTZD3 is RoHS-compliant and available in lead-free packaging. Per the Ordering Information section, lead-free versions are ordered by replacing the "-T" suffix with "+T" (e.g., MAX6737XKTZD3+T). The SC70-5 package meets JEDEC standards for moisture sensitivity level (MSL) 1 and supports standard reflow profiles.