Analog Devices Inc./Maxim Integrated MAX6316MUK46CY+T

Overview

MAX6316MUK46CY+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with bidirectional active-low reset output, 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply and μP activity in embedded systems requiring robust brownout detection and Motorola 68HC11-compatible reset signaling.

For engineers reviewing the MAX6316MUK46CY+T datasheet, MAX6316MUK46CY+T pinout, MAX6316MUK46CY+T application, or MAX6316MUK46CY+T equivalent, key selection criteria include bidirectional reset compatibility, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316MUK46CY+T implements a dual-stage reset generator with integrated watchdog timer and manual reset input. Its bidirectional RESET output combines a 4.7kΩ pullup resistor with an active P-channel pullup FET, enabling fast low-to-high transitions (<666ns at 5V/400pF) critical for μPs like the 68HC11 that sample RESET state after two clock cycles.

Reset assertion occurs when VCC falls below 4.63V (±2.5% over -40°C to +125°C), MR is pulled low, or WDI remains static beyond 1.6s. The device guarantees valid logic levels on RESET down to VCC = 1V and features internal ESD protection on MR and WDI pins.

Key Specifications

Pinout & Package

MAX6316MUK46CY+T is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) with thermal resistance θJA = 255.9°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK46CY+T and TLV809K46DBVR, the MAX6316MUK46CY+T uniquely delivers bidirectional reset signaling with active pullup-enabling μP self-diagnostic capability-while retaining full watchdog and manual reset functionality in the same compact SOT23-5 footprint.

Availability

MAX6316MUK46CY+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical devices, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX6316MUK46CY+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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets, emphasizing reliability, integration, and power efficiency.

The MAX6316–MAX6322 family targets microprocessor supervision in harsh environments, combining reset monitoring, watchdog timing, and manual reset in miniature packages with AEC-Q100 qualification for automotive use.

FAQ

What is the exact reset threshold voltage of MAX6316MUK46CY+T and how does it vary with temperature?

The MAX6316MUK46CY+T has a factory-trimmed nominal reset threshold of 4.63V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full -40°C to +125°C operating range. Its reset threshold temperature coefficient is 40ppm/°C, meaning drift is less than 12mV across the entire temperature span - sufficient for stable operation in automotive under-hood applications where supply rails may fluctuate.

How does the bidirectional RESET output of MAX6316MUK46CY+T differ from standard open-drain or push/pull outputs?

The MAX6316MUK46CY+T's bidirectional RESET integrates a 4.7kΩ pullup resistor with an active P-channel FET that turns on when RESET rises above 0.65V, accelerating the low-to-high transition. Unlike passive open-drain outputs, this design ensures RESET reaches 0.85×VCC within two μP clock cycles - critical for Motorola 68HC11 and similar μPs that distinguish self-initiated vs. external resets by sampling RESET state after release.

Can MAX6316MUK46CY+T operate reliably during severe supply transients such as automotive load dump?

Yes. The MAX6316MUK46CY+T is immune to short negative-going VCC transients down to 200ns duration, including ground-to-VCC spikes common in automotive environments. Its internal architecture prevents false resets during load dump events, and the AEC-Q100 Grade 1 qualification confirms performance across -40°C to +125°C with no derating - making it suitable for direct integration into ECU power domains without additional transient suppression.

What is the watchdog timeout period of MAX6316MUK46CY+T and how is it triggered?

The MAX6316MUK46CY+T features a typical watchdog timeout period of 1.6s, corresponding to the 'Y' suffix in its ordering code. It is triggered when the WDI pin remains static (no rising or falling edge) for longer than 1.6s. The internal watchdog timer clears on any WDI edge or during reset assertion, and restarts counting once reset deasserts - providing deterministic fault recovery for firmware hangs without requiring external timing components.

Does MAX6316MUK46CY+T require external components for basic operation?

No. The MAX6316MUK46CY+T operates autonomously with no external components: its 4.63V reset threshold is laser-trimmed internally, the 140ms reset timeout and 1.6s watchdog period are factory-programmed, and the bidirectional RESET includes integrated 4.7kΩ pullup + active pullup FET. Only VCC decoupling (0.1µF ceramic) is recommended per standard analog design practice - eliminating BOM cost and layout risk.