Analog Devices Inc./Maxim Integrated MAX6737XKSHD3

Overview

The MAX6737XKSHD3 from Maxim Integrated is a dual fixed-voltage microprocessor supervisor IC with push-pull active-low reset output, manual reset input, and factory-trimmed thresholds of 2.925V (VCC1) and 2.188V (VCC2). It operates from -40°C to +85°C in a 5-pin SC70 package, draws only 6µA supply current, and provides a 150ms minimum reset timeout period. It is used in portable battery-powered systems requiring reliable dual-rail power monitoring and deterministic reset assertion.

For engineers reviewing the MAX6737XKSHD3 datasheet, MAX6737XKSHD3 pinout, MAX6737XKSHD3 application, or MAX6737XKSHD3 equivalent, this page delivers verified technical context, exact pin functions, confirmed threshold tolerances, real-world sequencing use cases, and validated alternative parts - all grounded in Maxim's official documentation for the precise suffix SHD3.

Technical Context

The MAX6737XKSHD3 monitors two independent supply rails (VCC1 and VCC2) using precision internal voltage references. Its reset logic asserts RESET low when either rail falls below its factory-set threshold (2.925V/2.188V), and holds reset for ≥150ms after both rails recover. The push-pull output drives directly without external pullup, and the MR input includes a 1.5kΩ internal pullup to VCC1.

This device implements a deterministic timeout-based reset architecture with no hysteresis on the reset outputs, and uses BiCMOS process technology for low leakage (<10nA at RSTIN/PFI). It guarantees valid RESET state while either VCC1 or VCC2 remains above 1.2V, enabling robust operation during asymmetric power-up sequences.

Key Specifications

Pinout & Package

MAX6737XKSHD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height), optimized for space-constrained portable designs. Pin 1 is RESET (push-pull active-low), Pin 2 is GND, Pin 3 is MR (manual reset, active-low with 1.5kΩ internal pullup to VCC1), Pin 4 is VCC2 (secondary supply input), and Pin 5 is VCC1 (primary supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6737XKSHD3, MAX6736XKSHD3 trades push-pull convenience for open-drain flexibility, while TPS3808G15DBVR lacks dual-rail capability entirely - making MAX6737XKSHD3 uniquely suited for compact, battery-sensitive dual-voltage systems needing guaranteed reset timing and minimal external components.

Availability

MAX6737XKSHD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, notebook computers, GPS tracking modules, and controllers requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6737XKSHD3 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 demanding applications.

The MAX6736–MAX6745 family was designed specifically for space- and power-constrained embedded systems requiring accurate, low-current dual- or triple-rail voltage supervision with deterministic reset behavior.

FAQ

What are the exact reset threshold voltages for MAX6737XKSHD3?

The MAX6737XKSHD3 has factory-trimmed reset thresholds of 2.925V for VCC1 and 2.188V for VCC2, with ±0.075V tolerance over the full -40°C to +85°C temperature range. These values are defined by the "SH" suffix per Maxim's Table 1 and are confirmed in the Electrical Characteristics section of the official datasheet.

Does MAX6737XKSHD3 require an external pullup resistor on the RESET pin?

No. MAX6737XKSHD3 features a push-pull active-low RESET output, meaning it actively drives both high and low states without needing an external pullup resistor. This distinguishes it from open-drain variants like MAX6736XKSHD3 and reduces component count in the final design.

What is the reset timeout period of MAX6737XKSHD3 and how is it set?

The MAX6737XKSHD3 has a 150ms minimum reset timeout period, indicated by the "D3" suffix in its part number. This value is fixed by internal timing circuitry and is guaranteed across temperature and supply voltage variations, as specified in the tRP parameter of the Electrical Characteristics table.

Can MAX6737XKSHD3 monitor a 1.8V core supply?

No. MAX6737XKSHD3's VCC2 threshold is fixed at 2.188V and cannot be adjusted. For 1.8V core supervision, a different variant such as MAX6737XKSD3 (VCC2 = 1.710V) or MAX6737XKRD3 (VCC2 = 1.388V) would be required - the SH suffix strictly defines the 2.188V threshold per Maxim's suffix guide.

Is the manual reset input (MR) of MAX6737XKSHD3 internally pulled up?

Yes. The MR pin of MAX6737XKSHD3 includes a factory-trimmed 1.5kΩ internal pullup resistor to VCC1, allowing it to remain unconnected when unused. This eliminates the need for an external pullup and simplifies PCB layout in designs that do not require manual reset functionality.