Analog Devices Inc./Maxim Integrated MAX6736XKZGD3

Overview

The MAX6736XKZGD3 from Maxim Integrated is a dual-voltage microprocessor supervisor IC with two factory-trimmed reset thresholds (VTH1 = 2.925V, VTH2 = 0.788V), 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.

For engineers reviewing the MAX6736XKZGD3 datasheet, MAX6736XKZGD3 pinout, MAX6736XKZGD3 application, or MAX6736XKZGD3 equivalent, key selection criteria include dual fixed-threshold supervision, SC70-5 package footprint, 6µA quiescent current, -40°C to +85°C operation, and compatibility with battery-powered embedded controllers requiring reliable power-on reset and brownout detection.

Technical Context

The MAX6736XKZGD3 implements independent voltage monitoring for VCC1 (1.8V–5.0V range) and VCC2 (0.9V–3.3V range) using precision bandgap references. Its reset assertion logic combines analog comparators with a digital timeout counter that restarts on any threshold violation during the 150ms (min) reset pulse width.

It features an internal 1.5kΩ pullup on MR, supports CMOS-level manual reset triggering, and guarantees valid RESET state down to VCC1 = 1.2V. The open-drain RESET output requires an external pullup and interfaces directly with bidirectional µP reset pins without contention.

Key Specifications

Pinout & Package

MAX6736XKZGD3 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 (open-drain active-low), Pin 2 is GND, Pin 3 is MR (active-low manual reset), 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 MAX6316HPUK31D3-T and TPS3808G18DBVR, the MAX6736XKZGD3 uniquely delivers verified dual-threshold supervision in the smallest footprint, making it irreplaceable in space-limited dual-rail designs where simultaneous I/O and core rail monitoring is mandatory.

Availability

MAX6736XKZGD3 is available at Aetrix Electronics and suitable for portable medical sensors, notebook power management, industrial PLC I/O modules, and GPS tracking devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6736XKZGD3 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, sensing, and connectivity applications in industrial, medical, and consumer markets.

The MAX6736–MAX6745 family was engineered specifically for multivoltage microprocessor systems needing compact, low-power, dual- or triple-rail supervision with guaranteed reset timing and factory-trimmed accuracy.

FAQ

What are the exact reset threshold voltages for MAX6736XKZGD3?

The MAX6736XKZGD3 has factory-trimmed reset thresholds of VTH1 = 2.925V (±2.5%) for VCC1 and VTH2 = 0.788V (±2.5%) for VCC2, as defined by the "SZ" suffix per Table 1 in the datasheet. These values are tested and guaranteed over -40°C to +85°C and enable precise supervision of 3.0V I/O and 0.8V core supplies without external components. The MAX6736XKZGD3 does not support adjustable thresholds.

Does MAX6736XKZGD3 support manual reset functionality?

Yes, MAX6736XKZGD3 includes a dedicated active-low manual reset input (MR) on Pin 3. Pulling MR low for ≥1µs forces RESET low for 150ms (min), after which RESET remains asserted for the full timeout period. An internal 1.5kΩ pullup to VCC1 eliminates the need for an external resistor, simplifying pushbutton integration. This function operates independently of VCC1/VCC2 levels.

What is the reset output type and drive capability of MAX6736XKZGD3?

MAX6736XKZGD3 features an open-drain active-low RESET output (Pin 1) capable of sinking 3.2mA at VCC1 ≥ 4.25V with VOL ≤ 0.4V. It requires an external pullup resistor (typically 10kΩ to VCC1) and interfaces directly with bidirectional µP reset pins. Unlike push-pull variants, this configuration avoids contention in shared reset buses and supports wired-OR configurations.

Can MAX6736XKZGD3 monitor negative supply voltages?

No, MAX6736XKZGD3 cannot directly monitor negative voltages. Its VCC1 and VCC2 inputs are specified for 1.0V to 5.5V (VCC1) and 0.9V to 3.3V (VCC2) positive supplies only. For negative rail monitoring, use MAX6742/MAX6745 variants with PFI/PFO pins and external resistor networks as shown in Figure 4 of the datasheet. The MAX6736XKZGD3 lacks PFI/PFO functionality entirely.

What is the operating temperature range and supply current of MAX6736XKZGD3?

MAX6736XKZGD3 operates from -40°C to +85°C and draws 6µA typical supply current (ICC1 + ICC2) at +25°C with VCC1 = 3.3V and VCC2 = 2.5V. Current remains stable across temperature (see Figure MAX6736-45 toc01), enabling reliable operation in battery-powered industrial and medical devices where thermal drift and power budget constraints are critical.