Analog Devices Inc./Maxim Integrated MAX6320PUK30BX

Overview

MAX6320PUK30BX from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with open-drain active-low reset output, manual reset input, and watchdog timer. It features a factory-trimmed 3.0V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. Designed for brownout protection and system recovery in battery-powered embedded controllers.

For engineers reviewing the MAX6320PUK30BX datasheet, MAX6320PUK30BX pinout, MAX6320PUK30BX application, or MAX6320PUK30BX equivalent, this device delivers guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), and integrated open-drain reset compatible with multi-supply systems up to 6V.

Technical Context

The MAX6320PUK30BX implements a voltage-monitoring architecture that asserts reset when VCC falls below 3.0V (factory-trimmed ±1.5% at +25°C), remains asserted for ≥140ms after VCC recovers, and includes a manual reset input (MR) with 1.5µs minimum pulse width and 100ns glitch rejection. Its watchdog timer clears on any WDI edge and times out after 1.6s if unserviced.

It uses an NMOS open-drain RESET output requiring an external pullup resistor (e.g., 10kΩ to ≤6V), supports MR pullup via internal 52kΩ resistor, and guarantees VOL ≤0.4V at ISINK = 3.2mA (VCC ≥4.5V). Operating voltage range is 1.0V to 5.5V with supply current as low as 3µA at VCC = 3.6V.

Key Specifications

Pinout & Package

Package: 5-pin SOT23, surface-mount, lead(Pb)-free option available (replace "-T" with "+T" in order code).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320PUK30BX, the MAX6320PUK30D-T extends reset duration for marginal power supplies, while TPS3808G30DBVR trades watchdog capability for ultra-low ICC - both require PCB layout review due to differing pinouts and lack of drop-in compatibility.

Availability

MAX6320PUK30BX is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for MAX6320PUK30BX 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 targets space-constrained embedded systems needing robust, low-power supervisory functions - specifically engineered for reliable reset generation, manual intervention, and watchdog supervision in harsh environments.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6320PUK30BX?

The MAX6320PUK30BX has a factory-trimmed nominal reset threshold of 3.0V, specified as ±1.5% at +25°C and ±2.5% over the full operating temperature range of -40°C to +125°C. This value is confirmed in Table 1 of the datasheet and applies directly to the "30" suffix in the part number, indicating the 3.0V variant. The MAX6320PUK30BX does not require external calibration or trimming.

Does MAX6320PUK30BX include a watchdog timer, and what is its timeout period?

Yes, the MAX6320PUK30BX includes a watchdog timer with a typical timeout period of 1.6 seconds, corresponding to the "Y" suffix in its ordering code. The watchdog clears on any rising or falling edge at the WDI pin and asserts reset if unserviced for the full timeout duration. This behavior is explicitly documented in the Selector Guide and Electrical Characteristics tables for the MAX6320P series.

What type of reset output does MAX6320PUK30BX provide, and what external components are needed?

The MAX6320PUK30BX provides an active-low open-drain RESET output, requiring an external pullup resistor to a voltage rail up to 6V. A 10kΩ resistor is sufficient in most applications. Unlike push/pull variants, it does not source current - only sinks - enabling level-shifting and wired-OR configurations. No other external components are required for basic operation.

Can MAX6320PUK30BX operate reliably during severe supply voltage drops?

Yes, the MAX6320PUK30BX guarantees valid reset output down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset assertion even during deep brownout conditions where many supervisors lose functionality. The device continues monitoring and asserting reset until VCC rises above 3.0V and remains stable for ≥140ms.

Is MAX6320PUK30BX qualified for automotive applications?

The base MAX6320PUK30BX is rated for -40°C to +125°C operation and is AEC-Q100 qualified, as noted in the Benefits and Features section. Automotive-grade versions are designated with "/V" in the order code (e.g., MAX6320PUK30BX/V+T), confirming qualification for automotive body electronics and infotainment systems per AEC-Q100 Grade 1 requirements.