Analog Devices Inc./Maxim Integrated MAX6320PUK29CY/V+T

Overview

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

For engineers reviewing the MAX6320PUK29CY/V+T datasheet, MAX6320PUK29CY/V+T pinout, MAX6320PUK29CY/V+T application, or MAX6320PUK29CY/V+T equivalent, this page delivers verified technical context, real-world design meaning for each specification, package-validated pin functions, and two confirmed alternative parts with documented functional and application differences.

Technical Context

The MAX6320PUK29CY/V+T implements a precision voltage monitor with ±2.5% reset threshold tolerance over –40°C to +125°C, guaranteed reset validity down to VCC = 1V, and immunity to negative VCC transients ≤4µs at 100mV under threshold. Its open-drain RESET output requires an external pullup resistor (e.g., 10kΩ) to any supply up to 6V.

It integrates a watchdog timer cleared by WDI edge transitions (≥50ns pulse width), with four factory-programmed timeout options - this variant uses the Y-suffix (1.6s typ). The MR input features 52kΩ internal pullup, 100ns glitch rejection, and supports TTL/CMOS logic levels depending on VCC.

Key Specifications

Pinout & Package

MAX6320PUK29CY/V+T is housed in a RoHS-compliant, lead-free SOT23-5 package (outline 21-0057, land pattern 90-0174), with thermal resistance θJA = 255.9°C/W on multilayer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320PUK46CY/V+T and TPS3808G18DBVR, the MAX6320PUK29CY/V+T uniquely balances 3.3V-system compatibility, integrated watchdog supervision, and automotive-grade reliability in a 5-pin footprint - making it optimal for cost- and space-constrained embedded controllers requiring full-feature reset management.

Availability

MAX6320PUK29CY/V+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, battery-powered medical sensors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6320PUK29CY/V+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6316–MAX6322 family targets robust microprocessor supervision in harsh environments, delivering factory-trimmed thresholds, integrated watchdogs, and AEC-Q100 qualification for mission-critical embedded control.

FAQ

What is the exact reset threshold voltage of MAX6320PUK29CY/V+T and how is it trimmed?

The MAX6320PUK29CY/V+T has a factory-trimmed nominal reset threshold of 2.93V, with tolerance of ±2.5% over –40°C to +125°C. This value is laser-trimmed during production using internal resistive dividers (per Table 1 in the datasheet), ensuring accuracy without external calibration. The "29" in the part number directly references the 2.93V threshold point in Maxim's standard 100mV increment series from 2.5V to 5.0V.

Does MAX6320PUK29CY/V+T support watchdog functionality, and what is its timeout period?

Yes, MAX6320PUK29CY/V+T includes a watchdog timer with a typical timeout period of 1.6 seconds, corresponding to the "Y" suffix in its ordering code. The timer resets on any rising or falling edge at the WDI pin (minimum pulse width 50ns) and is automatically cleared during reset assertion. If WDI remains static beyond 1.6s, the device asserts RESET to recover the microprocessor.

Can MAX6320PUK29CY/V+T operate reliably at VCC = 1.2V, and what happens to RESET output?

Yes, MAX6320PUK29CY/V+T guarantees valid reset operation down to VCC = 1.0V. At VCC = 1.2V, the internal comparators remain functional and RESET will assert correctly if VCC drops below 2.93V. However, the open-drain RESET output cannot actively sink current below ~1.0V - so external pullup design must ensure logic-low recognition even at low VCC, typically by selecting a high-value pullup (e.g., 100kΩ) to avoid loading the output.

What is the function of the MR pin on MAX6320PUK29CY/V+T, and how should it be used?

The MR (manual reset) pin on MAX6320PUK29CY/V+T is an active-low input that forces a reset when pulled low. It features a 52kΩ internal pullup to VCC, allowing it to be left unconnected when unused. For hardware reset initiation, connect a momentary switch from MR to GND. The pin rejects glitches <100ns and supports TTL/CMOS logic levels - no external debouncing or level-shifting is required in standard 3.3V or 5V systems.

Is MAX6320PUK29CY/V+T compatible with 5V microcontrollers despite its 2.93V reset threshold?

Yes, MAX6320PUK29CY/V+T is fully compatible with 5V microcontrollers. Its 2.93V reset threshold is intended for monitoring the microcontroller's core or I/O supply (e.g., a 3.3V LDO feeding a 5V-tolerant MCU), not the 5V rail itself. The open-drain RESET output can be pulled up to 5V independently, enabling clean interface to 5V reset inputs while supervising lower-voltage domains - a key advantage over push/pull alternatives.