Analog Devices Inc./Maxim Integrated MAX6320PUK29CY+T

Overview

MAX6320PUK29CY+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with open-drain active-low reset output, 2.93V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity, provides manual reset input (MR), and asserts reset during power-up, brownout, or software hang conditions - used in battery-powered embedded controllers requiring reliable power-on initialization.

For engineers reviewing the MAX6320PUK29CY+T datasheet, MAX6320PUK29CY+T pinout, MAX6320PUK29CY+T application, or MAX6320PUK29CY+T equivalent, key selection criteria include its open-drain reset architecture (supports multi-supply reset bus), guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under VTH), and AEC-Q100 qualification for automotive-adjacent industrial use.

Technical Context

The MAX6320PUK29CY+T implements a voltage-monitoring comparator with 2.93V ±1.5% (±2.5% over temperature) threshold, paired with a digital reset generator that holds RESET low for ≥140ms after VCC rises above VTH. Its watchdog timer clears on any WDI edge and times out after 1.6s if unrefreshed - enabling detection of stalled firmware execution in microcontrollers.

It features an open-drain RESET output requiring an external pullup (to ≤6V), a manual reset input (MR) with internal 52kΩ pullup and 100ns glitch rejection, and watchdog input (WDI) compatible with three-state drivers sinking/sourcing ≥200µA. All functions operate across –40°C to +125°C with supply current as low as 3µA at 3.6V.

Key Specifications

Pinout & Package

MAX6320PUK29CY+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. The compact footprint supports high-density PCB layouts in space-constrained portable and automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320PUK29DZ+T and TPS3808G18DBVR, MAX6320PUK29CY+T uniquely combines 2.93V precision reset, 140ms timeout, 1.6s watchdog, open-drain output, and MR input in a single AEC-Q100-qualified SOT23 device - making it optimal for 3.3V embedded controllers needing robust, field-serviceable supervision.

Availability

MAX6320PUK29CY+T is available at Aetrix Electronics and suitable for industrial motor drives, medical wearables, automotive body control modules, and smart home sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6320PUK29CY+T 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX6316–MAX6322 family delivers highly integrated μP supervisory circuits targeting space-constrained, high-reliability embedded systems where accurate voltage monitoring, configurable reset timing, and watchdog safety are critical.

FAQ

What is the exact reset threshold voltage of the MAX6320PUK29CY+T?

The MAX6320PUK29CY+T has a factory-trimmed nominal reset threshold of 2.93V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during manufacturing and documented in Table 1 of the MAX6316–MAX6322 datasheet. The MAX6320PUK29CY+T uses the "29" suffix to denote this specific 2.93V variant.

Does the MAX6320PUK29CY+T support manual reset functionality?

Yes, the MAX6320PUK29CY+T includes a dedicated MR (manual reset) input on Pin 3. Pulling MR low forces an immediate reset assertion for the full duration of the 140ms timeout period. The pin features an internal 52kΩ pullup resistor, allowing it to be left unconnected when unused. The MAX6320PUK29CY+T also provides 100ns glitch rejection on MR to prevent spurious resets from noise.

What type of reset output does the MAX6320PUK29CY+T provide, and what external components are required?

The MAX6320PUK29CY+T provides an active-low open-drain RESET output on Pin 1. This requires an external pullup resistor to a supply rail (up to 6V). A 10kΩ resistor is typically sufficient for most applications. Unlike push-pull variants, this architecture enables wired-OR connections with other reset sources and level translation across different voltage domains - a key feature confirmed in the MAX6320PUK29CY+T's Selector Guide and Typical Operating Circuit.

Is the MAX6320PUK29CY+T qualified for automotive applications?

The MAX6320PUK29CY+T is AEC-Q100 qualified, meeting stress testing requirements for automotive electronics. While not marked with the "/V" automotive grade suffix, its qualification covers temperature cycling, humidity, and ESD robustness relevant to under-dash and body-control applications. This makes the MAX6320PUK29CY+T suitable for automotive-adjacent industrial systems and non-safety-critical vehicle subsystems where reliability under thermal and electrical stress is essential.

How does the watchdog timer in the MAX6320PUK29CY+T operate, and what is its timeout value?

The MAX6320PUK29CY+T watchdog timer clears on any rising or falling edge at the WDI pin and times out after 1.6s (typical) if unrefreshed - corresponding to the "Y" suffix in its part number. When asserted, it holds RESET low for the full 140ms timeout period. The timer is disabled by leaving WDI floating. This behavior is explicitly defined in the Selector Guide and Electrical Characteristics table for MAX6320P devices, confirming the 1.6s timeout for MAX6320PUK29CY+T.