Analog Devices Inc./Maxim Integrated MAX6736XKYDD3+

Overview

The MAX6736XKYDD3+ from Maxim Integrated is a dual-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.925V, VTH2 = 2.188V), 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 and multivoltage systems, asserting reset if either falls below its threshold. Designed for battery-powered equipment, it draws only 6µA typical supply current.

For engineers reviewing the MAX6736XKYDD3+ datasheet, MAX6736XKYDD3+ pinout, MAX6736XKYDD3+ application, or MAX6736XKYDD3+ equivalent, this device serves as a space-constrained, low-power supervisory solution for dual-rail power sequencing and fault detection in notebook computers, GPS modules, and POS terminals-where precise voltage monitoring and minimal quiescent current are critical.

Technical Context

The MAX6736XKYDD3+ implements independent dual-supply monitoring with fixed thresholds on both VCC1 and VCC2 inputs, using internal bandgap references and comparator circuitry to detect undervoltage conditions. Its reset assertion logic is edge-triggered on falling supply rails and includes built-in hysteresis (0.5%) to reject transients.

It features an open-drain RESET output requiring external pullup, a CMOS-compatible MR input with 1.5kΩ internal pullup to VCC1, and operates across the full industrial temperature range (–40°C to +85°C) with guaranteed functionality down to VCC1 ≥ 1.2V. The 150ms reset timeout (D3 suffix) is generated by an internal RC timer with ±25% tolerance over temperature.

Key Specifications

Pinout & Package

MAX6736XKYDD3+ is housed in a 5-pin SC70 package (1.6mm × 1.6mm × 0.9mm height), optimized for high-density portable designs. Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is MR (manual reset input), 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 MAX6737XKYDD3+, the MAX6736XKYDD3+ offers open-drain flexibility for multi-drop reset buses but requires an external pullup; versus TPS3808G15DBVR, it delivers true dual-rail supervision in half the footprint-critical for space-constrained portable designs.

Availability

MAX6736XKYDD3+ is available at Aetrix Electronics and suitable for portable medical sensors, notebook power management, GPS tracking modules, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6736XKYDD3+ 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, computing, and portable applications.

The MAX6736–MAX6745 family was designed specifically for low-power, space-constrained dual- and triple-voltage supervision in battery-operated and multirail embedded systems-emphasizing ultra-low IQ, factory-trimmed accuracy, and SC70 packaging.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6736XKYDD3+?

The MAX6736XKYDD3+ has a factory-trimmed VCC1 reset threshold of 2.925V (±2.5%) at +25°C, as defined by the "Y" suffix in its part number per Table 1 of the datasheet. This value is guaranteed over the full –40°C to +85°C operating range and applies specifically to the MAX6736XKYDD3+ variant-not other members of the MAX6736–MAX6745 family.

Does the MAX6736XKYDD3+ support manual reset functionality?

Yes, the MAX6736XKYDD3+ includes a dedicated active-low manual reset input (MR) on Pin 3. Pulling MR low for ≥1µs forces the open-drain RESET output low for the full 150ms timeout period. An internal 1.5kΩ pullup resistor to VCC1 allows direct connection to a momentary switch without external components.

What package type and dimensions does the MAX6736XKYDD3+ use?

The MAX6736XKYDD3+ is packaged in a 5-pin SC70 (also labeled SC70-5) case measuring 1.6mm × 1.6mm × 0.9mm. It is lead-free and RoHS-compliant, with pin 1 marked by a dot. This compact footprint is significantly smaller than industry-standard SOT23-6 packages and supports high-density PCB layouts.

Can the MAX6736XKYDD3+ monitor a 1.8V core supply?

Yes-the MAX6736XKYDD3+ monitors VCC2 (Pin 4) with a fixed threshold of 2.188V, which is suitable for supervising 2.2V nominal core supplies. For a true 1.8V rail, the MAX6736XKYDD3+ is not appropriate; instead, variants like MAX6736XKSD3+ (VTH2 = 1.665V) or MAX6736XKRD3+ (VTH2 = 1.388V) would be required per Table 1.

Is an external pullup resistor required for the RESET output of the MAX6736XKYDD3+?

Yes-an external pullup resistor is mandatory for the open-drain RESET output (Pin 1) of the MAX6736XKYDD3+. A typical value is 10kΩ connected between Pin 1 and VCC1. Without this pullup, the RESET signal cannot transition high, preventing proper µP release after power stabilization.