Analog Devices Inc./Maxim Integrated MAX6737XKYHD3+T

Overview

The MAX6737XKYHD3+T 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), operating over -40°C to +85°C in a 5-pin SC70 package. It asserts reset when either supply falls below its threshold and maintains reset for ≥150ms after both supplies recover. Designed for portable and multivoltage systems, it enables reliable power-up sequencing and fault detection in battery-powered controllers and GPS equipment.

For engineers reviewing the MAX6737XKYHD3+T datasheet, MAX6737XKYHD3+T pinout, MAX6737XKYHD3+T application, or MAX6737XKYHD3+T equivalent, key selection criteria include its push-pull RESET output (no external pullup required), 6µA supply current, dual fixed thresholds, 150ms timeout, and SC70-5 footprint compatibility with space-constrained embedded designs.

Technical Context

The MAX6737XKYHD3+T monitors two independent supply rails-VCC1 (primary I/O supply) and VCC2 (secondary core supply)-using precision internal voltage references. Its reset logic combines analog comparators with a digital timeout counter that restarts on any threshold violation during the reset period.

It features an active-low manual reset input (MR) with internal 1.5kΩ pullup to VCC1, debounced via a dedicated 150ms timeout circuit. The push-pull RESET output is referenced to VCC1 and drives high to ≥0.8×VCC1 when deasserted, eliminating need for external pullup resistors unlike open-drain variants.

Key Specifications

Pinout & Package

Package: 5-pin SC70 (1.6mm × 1.6mm, 0.5mm pitch, thin-profile surface-mount).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6736XKYHD3+T, the MAX6737XKYHD3+T eliminates external pullup components and simplifies layout, while TPS3808G15DBVR reduces functionality to single-rail supervision-making MAX6737XKYHD3+T the optimal choice for space-constrained dual-supply systems requiring guaranteed reset timing and ultra-low current.

Availability

MAX6737XKYHD3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage systems, and notebook computers requiring stable component supply with lead-free compliance and tape-and-reel packaging.

Supply support for MAX6737XKYHD3+T 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 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 electronics, delivering precision thresholds, minimal quiescent current, and compact SC70 packaging.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6737XKYHD3+T?

The MAX6737XKYHD3+T has factory-trimmed reset thresholds of 2.925V for VCC1 and 2.188V for VCC2, as indicated by the "YH" suffix per Maxim's Table 1. These values are guaranteed over -40°C to +85°C with ±1.5% tolerance and require no external calibration or resistor networks.

Does the MAX6737XKYHD3+T require an external pullup resistor on the RESET pin?

No, the MAX6737XKYHD3+T features a push-pull RESET output, so it drives high to ≥0.8×VCC1 when deasserted and does not require an external pullup resistor-unlike open-drain variants such as MAX6736XKYHD3+T.

What is the reset timeout period of the MAX6737XKYHD3+T, and is it adjustable?

The MAX6737XKYHD3+T has a fixed minimum reset timeout period of 150ms, denoted by the "D3" suffix. This timeout is not user-adjustable-it is internally generated and guaranteed across temperature and supply voltage variations.

Can the MAX6737XKYHD3+T monitor a 1.8V core supply?

No-the MAX6737XKYHD3+T is configured with fixed thresholds of 2.925V (VCC1) and 2.188V (VCC2). For 1.8V core monitoring, a different variant such as MAX6737XKSD3+T (VCC2 = 1.665V) or MAX6737XKRD3+T (VCC2 = 1.388V) would be required, as specified in Table 1.

Is the manual reset input (MR) of the MAX6737XKYHD3+T internally pulled up?

Yes, the MR pin of the MAX6737XKYHD3+T includes an internal 1.5kΩ pullup resistor to VCC1, allowing it to be left unconnected when unused. When asserted, MR must be held low for ≥1µs to trigger reset, and the output remains low for 150ms after MR returns high.