Analog Devices Inc./Maxim Integrated MAX6736XKSYD3

Overview

The MAX6736XKSYD3 from Maxim Integrated is a dual fixed-voltage microprocessor supervisor IC in SC70-5 package, monitoring VCC1 at 2.925V and VCC2 at 2.188V with open-drain active-low RESET output, 150ms minimum reset timeout, and manual reset input (MR). It asserts reset when either supply falls below its factory-trimmed threshold and maintains reset for the full timeout after recovery - ideal for portable battery-powered systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the MAX6736XKSYD3 datasheet, MAX6736XKSYD3 pinout, MAX6736XKSYD3 application, or MAX6736XKSYD3 equivalent, key selection criteria include dual fixed-threshold supervision (2.925V/2.188V), 6µA quiescent current, SC70-5 footprint compatibility, -40°C to +85°C operation, and MR-initiated reset with 150ms timeout - all critical for low-power embedded designs with tight board space constraints.

Technical Context

The MAX6736XKSYD3 implements two independent voltage comparators with precision factory-trimmed thresholds (VTH1 = 2.925V, VTH2 = 2.188V) referenced to internal bandgap references. Its reset logic combines ORed fault detection across VCC1 and VCC2, with a monostable timeout circuit ensuring minimum 150ms assertion after any threshold violation.

It features an internal 1.5kΩ pullup on MR, supports CMOS-level manual reset triggering, and uses open-drain RESET output requiring external pullup - enabling bidirectional µP reset I/O interfacing via series resistor. No POK, RSTIN, PFI, or PFO functionality is present per device family configuration.

Key Specifications

Pinout & Package

MAX6736XKSYD3 is housed in a 5-pin SC70-5 package (1.6mm × 1.6mm × 0.9mm height), optimized for ultra-compact 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 MAX6316HUT46D3-T and TPS3808G125DBVR, the MAX6736XKSYD3 uniquely delivers factory-trimmed dual-threshold supervision in the smallest possible footprint - making it optimal where board area is constrained and fixed rail voltages (2.925V/2.188V) match system architecture.

Availability

MAX6736XKSYD3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, notebook subsystems, GPS tracking modules, and battery-powered IoT edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6736XKSYD3 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, automotive, and consumer markets.

The MAX6736–MAX6745 product line delivers ultra-low-power dual/triple-voltage supervisors targeting space- and energy-constrained portable electronics needing reliable, factory-calibrated power monitoring without external components.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6736XKSYD3?

The MAX6736XKSYD3 has factory-trimmed reset thresholds of 2.925V for VCC1 and 2.188V for VCC2, as indicated by the "SY" suffix per Maxim's Table 1. These values are specified over -40°C to +85°C with ±1.5% tolerance and enable precise supervision of common 3.0V I/O and 2.2V core rails without external calibration. The MAX6736XKSYD3 does not support adjustable thresholds.

Does the MAX6736XKSYD3 support power-fail detection or POK output functionality?

No, the MAX6736XKSYD3 does not include power-fail input (PFI), power-fail output (PFO), or power-OK (POK1) functionality. Per the Selector Guide and Pin Configurations, it belongs to the MAX6736/MAX6737 group - which offers only dual fixed-voltage supervision with MR and open-drain/push-pull RESET. For PFI/PFO capability, consider MAX6742XKSYD3 or MAX6745XKSYD3 instead.

What is the function of the MR pin on the MAX6736XKSYD3, and how is it biased?

The MR pin on the MAX6736XKSYD3 is an active-low manual reset input with an internal 1.5kΩ pullup resistor to VCC1. Pulling MR to GND for ≥1µs forces RESET low immediately, and RESET remains asserted for the full 150ms timeout after MR returns high. This enables pushbutton or logic-controlled system recovery without external biasing components - a key design simplification confirmed in the Pin Description table.

Can the MAX6736XKSYD3 be used with a 1.8V VCC2 supply?

Yes, the MAX6736XKSYD3 supports VCC2 operation down to 1.0V per Absolute Maximum Ratings and Electrical Characteristics tables. While its factory-trimmed VCC2 threshold is 2.188V, the device functions correctly with 1.8V VCC2 supply - monitoring that rail against the 2.188V threshold will assert RESET if VCC2 drops below 2.188V, which is appropriate for detecting brownout on a nominal 2.2V rail. The MAX6736XKSYD3 datasheet confirms VCC2 operating range of 1.0V to 3.3V.

Is the RESET output of the MAX6736XKSYD3 push-pull or open-drain?

The RESET output of the MAX6736XKSYD3 is open-drain active-low, as confirmed in the Selector Guide (row MAX6736 shows "X" under OPEN-DRAIN RESET and "-" under PUSH-PULL RESET) and Pin Description (RESET pin function states "open-drain outputs require an external pullup resistor"). This configuration allows wired-OR reset bus implementation and level-shifting flexibility - essential for interfacing with µPs having bidirectional reset I/O pins.