Analog Devices Inc./Maxim Integrated MAX6316LUK45CY+T

Overview

MAX6316LUK45CY+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 4.5V factory-trimmed reset threshold (±1.5% at +25°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply voltage, provides manual reset input, and ensures reliable power-on/brownout reset for embedded controllers.

For engineers reviewing the MAX6316LUK45CY+T datasheet, MAX6316LUK45CY+T pinout, MAX6316LUK45CY+T application, or MAX6316LUK45CY+T equivalent, key selection criteria include reset threshold accuracy over temperature, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, and compatibility with systems requiring bidirectional or open-drain alternatives.

Technical Context

The MAX6316LUK45CY+T implements a precision bandgap-based reset generator with laser-trimmed resistive divider setting VRST = 4.5V ±1.5% at +25°C and ±2.5% over –40°C to +125°C. Its internal watchdog timer clears on WDI edge transitions and asserts reset if un-serviced for 1.6s (typ), with propagation delay tRD = 40µs during VCC fall.

Reset assertion is guaranteed for VCC < VRST, MR low, or WDI timeout; deassertion occurs after VCC rises above VRST plus 140ms (min) timeout. The push/pull output drives high/low actively (VOL ≤ 0.3V @ ISINK = 1.2mA, VOH ≥ 0.8×VCC @ ISOURCE = 500µA), eliminating external pullup components.

Key Specifications

Pinout & Package

MAX6316LUK45CY+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. Thermal resistance θJA = 255.9°C/W on multilayer board enables stable operation at full temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK45CY+T, the MAX6316MUK45CY+T enables bidirectional reset arbitration but adds complexity in timing validation, while MAX6320PUK45CY+T supports higher-voltage reset buses at the cost of an extra component and reduced noise immunity.

Availability

MAX6316LUK45CY+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6316LUK45CY+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 industrial, automotive, and communications markets, emphasizing high reliability and low power consumption.

The MAX6316–MAX6322 family targets microprocessor supervision in harsh environments, delivering factory-trimmed voltage thresholds, configurable timeouts, and AEC-Q100 qualification for mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage for MAX6316LUK45CY+T?

The MAX6316LUK45CY+T features a factory-trimmed reset threshold of 4.5V, specified as ±1.5% at +25°C and ±2.5% over the full –40°C to +125°C operating range. This precision is achieved using laser-trimmed resistors and ensures consistent brownout detection for 4.5V nominal supply rails without external calibration.

Does MAX6316LUK45CY+T support manual reset functionality?

Yes, MAX6316LUK45CY+T includes an active-low manual reset input (MR) pin. Pulling MR low forces a reset that remains asserted for the full 140ms timeout period after MR returns high. The MR pin has an internal 52kΩ pullup resistor, allowing it to be left unconnected when unused, and supports TTL/CMOS logic levels depending on system VCC.

How does the watchdog timer operate in MAX6316LUK45CY+T?

The MAX6316LUK45CY+T watchdog timer has a typical timeout of 1.6s. It clears on any rising or falling edge at the WDI pin and asserts reset if un-serviced for the full timeout period. The timer also resets automatically during power-on or manual reset assertion, ensuring continuous firmware monitoring without additional software overhead.

Is MAX6316LUK45CY+T qualified for automotive applications?

Yes, MAX6316LUK45CY+T is AEC-Q100 qualified and rated for operation from –40°C to +125°C. Its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, and robust SOT23 packaging make it suitable for automotive body control modules, infotainment power management, and other under-hood or cabin applications.

What package type and footprint does MAX6316LUK45CY+T use?

MAX6316LUK45CY+T uses a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) with gull-wing leads and RoHS-compliant lead-free finish (+T suffix). Its compact 2.9mm × 1.6mm footprint supports high-density PCB layouts, and thermal resistance θJA = 255.9°C/W on multilayer boards ensures stable performance at maximum junction temperature.