Analog Devices Inc./Maxim Integrated MAX6316MUK47BY+

Overview

MAX6316MUK47BY+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with bidirectional active-low reset output, 4.7V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity and provides manual reset and watchdog functionality for embedded control systems requiring robust brownout detection and μP reset coordination.

For engineers reviewing the MAX6316MUK47BY+ datasheet, MAX6316MUK47BY+ pinout, MAX6316MUK47BY+ application, or MAX6316MUK47BY+ equivalent, key selection criteria include its bidirectional reset interface for Motorola 68HC11-compatible systems, guaranteed reset validity down to VCC = 1V, immunity to sub-4µs negative VCC transients, and integrated 4.7kΩ pullup with active P-channel enhancement for fast RESET rise time under capacitive loading.

Technical Context

The MAX6316MUK47BY+ implements a precision voltage monitor using laser-trimmed resistors to set VRST = 4.7V ±2.5%, with hysteresis of 3mV and temperature coefficient of 40ppm/°C. Its bidirectional reset architecture combines a 4.7kΩ passive pullup with an active P-channel FET that engages when RESET rises above 0.65V (VPTH) and disengages after reaching 0.85×VCC or timing out after 2µs.

It integrates a watchdog timer cleared by WDI edges (min pulse width 50ns) or reset assertion, with four selectable timeout periods - here configured to 1.6s (Y-T variant). Manual reset (MR) is supported with 52kΩ internal pullup, 100ns glitch rejection, and 230ns propagation delay at VCC = 5V.

Key Specifications

Pinout & Package

MAX6316MUK47BY+ is housed in a miniature 5-pin SOT23 package (outline 21-0057, land pattern 90-0174), optimized for space-constrained embedded applications. The device uses a standard pinout compatible with the MAX6316–MAX6322 family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316MUK46CY+, MAX6316MUK47BY+ offers +70mV higher reset threshold for improved noise margin in noisy 5V systems; compared with TLV803EB29DBZR, it delivers full supervisory functionality including watchdog, MR, and bidirectional reset-critical for μP-based controllers requiring fault resilience.

Availability

MAX6316MUK47BY+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded control systems, intelligent instruments, and industrial controllers requiring stable component supply with AEC-Q100 qualification and extended temperature support.

Supply support for MAX6316MUK47BY+ 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 power, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6316–MAX6322 product line delivers compact, factory-trimmed supervisory circuits with configurable reset thresholds, watchdog timers, and specialized reset outputs-including bidirectional variants like MAX6316MUK47BY+-to simplify power-up sequencing and fault recovery in μP-based systems.

FAQ

What is the exact reset threshold voltage of MAX6316MUK47BY+ and how does it vary with temperature?

The MAX6316MUK47BY+ has a nominal reset threshold of 4.70V 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 temperature coefficient is 40ppm/°C, resulting in maximum deviation of approximately ±11.8mV per 10°C change. This precision is achieved via laser-trimmed internal resistors, eliminating need for external calibration.

Does MAX6316MUK47BY+ require an external pullup resistor on the RESET pin?

No, MAX6316MUK47BY+ does not require an external pullup resistor on the RESET pin. It integrates a 4.7kΩ internal pullup resistor combined with an active P-channel FET that engages during RESET rise transitions. This dual-stage pullup ensures rapid voltage rise (≤666ns with 400pF load at 5V) even under heavy capacitive loading from multiple devices on the reset bus.

How does the watchdog timer in MAX6316MUK47BY+ respond to WDI signal transitions?

The MAX6316MUK47BY+ watchdog timer clears on any rising or falling edge at the WDI pin, with minimum detectable pulse width of 50ns. If no edge occurs within the 1.6s timeout period, RESET is asserted. When WDI is left unconnected, the internal timer is automatically serviced at intervals equal to 7/8 of the watchdog period, effectively disabling the watchdog function without external hardware.

Can MAX6316MUK47BY+ operate reliably during severe supply voltage droop?

Yes, MAX6316MUK47BY+ guarantees valid reset assertion down to VCC = 1.0V, ensuring deterministic behavior during deep brownout conditions. Its internal circuitry remains functional and RESET output remains logic-low until VCC recovers above 4.7V and sustains the 140ms timeout period. This capability prevents spurious μP execution in systems with weak or collapsing power rails.

What is the purpose of the bidirectional RESET output in MAX6316MUK47BY+ and which microprocessors benefit most?

The bidirectional RESET output in MAX6316MUK47BY+ enables direct interface with microprocessors like the Motorola 68HC11 that use the same pin for both asserting and sampling reset status. It allows the μP to distinguish between externally generated resets (e.g., power failure) and self-generated resets (e.g., watchdog timeout) by observing RESET line behavior during startup, supporting vector-based fault recovery without external logic.