Analog Devices Inc./Maxim Integrated MAX6726AKASHD3+

Overview

MAX6726AKASHD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC in an 8-pin SOT23 package, monitoring VCC1 (primary supply) and VCC2 (secondary supply) with factory-trimmed reset thresholds of 4.625V and 3.075V respectively, 210ms minimum reset timeout, push-pull active-low RST output, and integrated watchdog timer with 35s startup and 1.12s normal timeout. It ensures reliable system reset in telecom power supplies and industrial controllers.

For engineers reviewing the MAX6726AKASHD3+ datasheet, MAX6726AKASHD3+ pinout, MAX6726AKASHD3+ application, or MAX6726AKASHD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, and watchdog disable capability via floating WDI input.

Technical Context

The MAX6726AKASHD3+ implements independent voltage comparators for VCC1 and VCC2 with internal 20ppm/°C tempco and 0.5% hysteresis, asserting reset when either supply falls below its threshold. Its dual-mode watchdog uses a 35s minimum startup period after reset and transitions to 1.12s minimum normal timeout upon first WDI edge detection.

Reset assertion is latched for a fixed 210ms minimum timeout period after all monitored voltages recover; the internal timer restarts if any supply dips below threshold before timeout completion. The device supports manual reset via MR (with 50kΩ internal pullup to VCC1) and provides push-pull RST referenced to VCC1 and open-drain PFO referenced to VCC1.

Key Specifications

Pinout & Package

MAX6726AKASHD3+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in telecom and portable equipment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with MAX6726AKASHD3+, MAX6725AKASHD3+ offers identical monitoring specs but requires external pullup for RST, while TPS3808G33DBVR reduces functionality to single-rail supervision-neither provides the dual-supply assurance and integrated watchdog of the MAX6726AKASHD3+.

Availability

MAX6726AKASHD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6726AKASHD3+ 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 demanding industrial, automotive, and communications applications.

The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits targeting multivoltage systems where reliability, small footprint, and guaranteed operation down to 0.8V are critical design requirements.

FAQ

What are the factory-trimmed reset thresholds for MAX6726AKASHD3+?

The MAX6726AKASHD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, specified with ±1.5% tolerance over the full -40°C to +125°C operating range. These values are encoded in the "ASH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are verified during production test.

Does MAX6726AKASHD3+ support watchdog functionality, and how is it configured?

Yes, MAX6726AKASHD3+ includes a dual-mode watchdog timer with 35s minimum startup period after reset and 1.12s minimum normal timeout. It is enabled by driving WDI (pin 6) with periodic edges; leaving WDI unconnected disables the watchdog entirely using an internal 200nA detector, making MAX6726AKASHD3+ flexible for both watchdog and non-watchdog designs.

What is the reset timeout period of MAX6726AKASHD3+, and how is it set?

The MAX6726AKASHD3+ has a 210ms minimum reset timeout period, indicated by the "D3" suffix in its part number per Maxim's Reset Timeout Period Suffix Guide. This fixed timeout is factory-programmed and guarantees the reset signal remains asserted for at least 210ms after all monitored supplies exceed their thresholds, ensuring µP boot completion.

How does MAX6726AKASHD3+ handle brownout conditions where VCC1 or VCC2 drops near 0.8V?

MAX6726AKASHD3+ guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V, meaning it will assert reset reliably even during severe brownouts. This specification ensures deterministic behavior in automotive cold-crank or industrial line-dip scenarios where supply rails dip below nominal levels but remain above 0.8V.

What package type and pin count does MAX6726AKASHD3+ use?

MAX6726AKASHD3+ is packaged in an 8-pin SOT23 (also referred to as SOT23-8) with dimensions 2.9mm × 1.6mm × 1.1mm. This compact surface-mount package supports high-density PCB layouts in space-constrained applications like telecom modules and portable instrumentation, and is RoHS-compliant (+ suffix).