Analog Devices Inc./Maxim Integrated MAX6737XKSDD3

Overview

The MAX6737XKSDD3 from Maxim Integrated is a dual fixed-voltage microprocessor supervisor IC with push-pull active-low RESET output, manual reset input (MR), and factory-trimmed thresholds of 2.925V (VCC1) and 2.188V (VCC2). It features a 150ms minimum reset timeout period, 6µA supply current, and operates over –40°C to +85°C in a 5-pin SC70 package. It is used in portable multivoltage systems to ensure reliable power-on reset and brownout detection for I/O and core supplies.

For engineers reviewing the MAX6737XKSDD3 datasheet, MAX6737XKSDD3 pinout, MAX6737XKSDD3 application, or MAX6737XKSDD3 equivalent, key selection criteria include confirmed dual fixed-threshold supervision, push-pull RESET drive capability, MR timing compatibility (150ms timeout), SC70-5 thermal and layout constraints, and voltage threshold tolerance across temperature.

Technical Context

The MAX6737XKSDD3 monitors two independent supply rails-VCC1 (primary, e.g., I/O) and VCC2 (secondary, e.g., core)-and asserts RESET when either falls below its factory-set threshold. Reset remains asserted for ≥150ms after both supplies recover, with internal timer restart on any subsequent undervoltage event.

It implements a dedicated active-low MR input with 1.5kΩ internal pullup to VCC1, supporting momentary switch or logic-driven reset initiation. The push-pull RESET output drives high to VCC1 (≥0.8×VCC1 at 800µA source) and low to ≤0.4V (at 3.2mA sink), eliminating need for external pullup resistors.

Key Specifications

Pinout & Package

Package: 5-pin SC70 (1.6mm × 1.6mm, 0.5mm pitch, 0.9mm max height), surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6736XKSDD3, the MAX6737XKSDD3 eliminates external pullup needs and simplifies layout, while TPS3808G15DBVR offers lower IQ but cannot replace dual-monitoring functionality-making MAX6737XKSDD3 optimal for compact, dual-rail integrity assurance.

Availability

MAX6737XKSDD3 is available at Aetrix Electronics and suitable for portable equipment, multivoltage embedded controllers, and notebook power management requiring stable component supply, guaranteed -40°C to +85°C operation, and SC70 footprint compatibility.

Supply support for MAX6737XKSDD3 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 precision analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6736–MAX6745 family was designed specifically for low-power dual- and triple-voltage microprocessor supervision in space- and energy-constrained portable and embedded systems.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6737XKSDD3?

The MAX6737XKSDD3 has factory-trimmed reset thresholds of 2.925V for VCC1 and 2.188V for VCC2, with ±1.5% tolerance over the full –40°C to +85°C temperature range. These values are defined by the "S" and "Y" suffixes in the part number and are fully characterized in the device's Electrical Characteristics table.

Does the MAX6737XKSDD3 require an external pullup resistor on the RESET pin?

No, the MAX6737XKSDD3 features a push-pull RESET output, so it does not require an external pullup resistor. It actively drives high to ≥0.8×VCC1 (at 800µA) and low to ≤0.4V (at 3.2mA), enabling direct connection to most microprocessor reset inputs without additional components.

What is the function of the MR pin on the MAX6737XKSDD3, and what timing applies?

The MR pin on the MAX6737XKSDD3 is an active-low manual reset input with an internal 1.5kΩ pullup to VCC1. Pulling MR low for ≥1µs forces RESET low; RESET remains asserted for 150ms (D3 timeout) after MR returns high. This provides hardware-initiated reset for testing, service, or emergency recovery.

Can the MAX6737XKSDD3 monitor voltages below 1.0V, such as a 0.9V core rail?

No-the MAX6737XKSDD3 is configured for fixed dual thresholds (2.925V/2.188V) and does not support sub-1.0V monitoring. For 0.9V core supervision, consider the MAX6738/MAX6739 with RSTIN input or MAX6740/MAX6743 variants, which support adjustable thresholds down to 0.488V via external resistor dividers.

Is the MAX6737XKSDD3 pin-compatible with other devices in the MAX6736–MAX6745 family?

Yes, all MAX6736–MAX6745 devices use the same 5-pin SC70 package and identical pinout (RESET, GND, MR, VCC2, VCC1). However, functionality differs: MAX6737XKSDD3 has push-pull RESET and no PFI/PFO/POK1; swapping with MAX6742/MAX6745 would require schematic and firmware validation due to missing power-fail features.