Analog Devices Inc./Maxim Integrated MAX6322HPUK29A

Overview

MAX6322HPUK29A from Maxim Integrated is a 5-pin µP supervisory circuit with watchdog timer and manual reset, designed to monitor VCC supply voltage and microprocessor activity in embedded systems. It features a factory-trimmed 2.93V reset threshold, 140ms minimum reset timeout, 1.6s typical watchdog timeout, active-high push/pull reset output, and guaranteed valid reset operation down to VCC = 1V - used in portable computers and battery-powered controllers.

For engineers reviewing the MAX6322HPUK29A datasheet, MAX6322HPUK29A pinout, MAX6322HPUK29A application, or MAX6322HPUK29A equivalent, key selection criteria include reset threshold accuracy (±2.5% over -40°C to +125°C), immunity to sub-4µs VCC transients, low 5µA typical supply current at 3.6V, and compatibility with bidirectional µP reset protocols such as Motorola 68HC11.

Technical Context

The MAX6322HPUK29A implements a precision voltage-monitoring comparator with 40ppm/°C temperature coefficient, coupled to a digital reset generator with fixed 140ms active timeout and a separate watchdog timer cleared by WDI edge transitions. Its active-high push/pull RESET output guarantees VOH ≥ 0.8×VCC and VOL ≤ 0.4V at VCC ≥ 4.5V with 800µA source/sink capability.

It integrates a manual reset input (MR) with internal 52kΩ pullup and 100ns glitch rejection, and a watchdog input (WDI) that accepts 50ns minimum pulse width and draws ≤160µA when driven high. The device operates across 1.0V–5.5V VCC and is specified for -40°C to +125°C industrial temperature range.

Key Specifications

Pinout & Package

MAX6322HPUK29A is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mountable with standard reflow profiles. Pin 1 is marked with a dot; pin numbering follows standard SOT23 top-view convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with MAX6322HPUK46A, the MAX6322HPUK29A provides earlier brownout response for 3.3V rails; compared with TPS3808G33DBVR, it delivers integrated watchdog and manual reset functionality at the cost of higher quiescent current - making it suitable for systems requiring comprehensive fault coverage over pure battery longevity.

Availability

MAX6322HPUK29A is available at Aetrix Electronics and suitable for portable computers, industrial controllers, and battery-powered sensors requiring stable component supply, long-term lifecycle support, and guaranteed performance across extended temperature ranges.

Supply support for MAX6322HPUK29A 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, computing, and communications markets.

The MAX6316–MAX6322 family was engineered to deliver robust, low-cost µP supervision with integrated watchdog and manual reset in miniature SOT23 packages - targeting space-constrained, battery-sensitive, and thermally demanding embedded applications.

FAQ

What is the exact reset threshold voltage of MAX6322HPUK29A?

The MAX6322HPUK29A has a factory-trimmed nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full -40°C to +125°C temperature range. This value is confirmed in Table 1 and Table 2 of the official Maxim datasheet (Rev 11, Feb 2013), and corresponds to the "29" suffix in the part number per the ordering guide.

Does MAX6322HPUK29A support manual reset functionality?

Yes, MAX6322HPUK29A includes a dedicated manual reset (MR) input (Pin 3) with internal 52kΩ pullup. Driving MR low for ≥1.5µs asserts RESET for the full 140ms timeout period. The MR pin rejects 100ns transients and is compatible with TTL/CMOS logic levels - enabling simple pushbutton or GPIO-based reset initiation without external components.

What is the watchdog timeout behavior of MAX6322HPUK29A?

MAX6322HPUK29A features a 1.6s typical watchdog timeout period (suffix "Y"). The internal timer clears on any rising or falling edge at the WDI pin (Pin 2); if no transition occurs within 1.6s, RESET asserts. When WDI is left unconnected, the timer is internally serviced every ~1.4s (7/8 of timeout), effectively disabling the watchdog function without external circuitry.

Can MAX6322HPUK29A operate reliably below 2.0V VCC?

Yes, MAX6322HPUK29A is fully specified to operate down to VCC = 1.0V. Its reset output remains valid (VOH ≥ 0.8×VCC, VOL ≤ 0.4V) and timing parameters remain guaranteed throughout this range - a key differentiator for brownout resilience in battery-powered systems where supply voltage may dip below 2.0V during discharge or load transients.

Is MAX6322HPUK29A pin-compatible with other devices in the MAX6316–MAX6322 family?

Yes, all MAX6316–MAX6322 devices share identical 5-pin SOT23 pinout and footprint. MAX6322HPUK29A uses Pin 1=GND, Pin 2=WDI, Pin 3=MR, Pin 4=VCC, Pin 5=RESET - matching the mechanical and electrical layout of MAX6316, MAX6317, MAX6318, MAX6319, MAX6320, MAX6321, and MAX6322 variants, enabling design reuse across threshold and feature configurations.