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, manual reset input, and watchdog timer. It features a factory-trimmed 4.63V reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. Designed for embedded control systems requiring reliable power-on/brownout detection and µP activity monitoring, it guarantees valid reset assertion down to VCC = 1V.

For engineers reviewing the MAX6316MUK47BY datasheet, MAX6316MUK47BY pinout, MAX6316MUK47BY application, or MAX6316MUK47BY equivalent, key selection considerations include its bidirectional reset interface (optimized for Motorola 68HC11), immunity to fast VCC transients (<4µs at 100mV under threshold), guaranteed operation across –40°C to +125°C, and internal 4.7kΩ pullup with active P-channel assist for fast RESET rise time on capacitive buses.

Technical Context

The MAX6316MUK47BY implements a dual-stage reset generator with voltage-monitoring comparator and programmable timeout counter, coupled with a transition-detecting watchdog timer cleared by rising or falling edges on WDI. Its bidirectional RESET output integrates a 4.7kΩ passive pullup and an active P-channel FET enabled when RESET rises above 0.65V, ensuring sub-500ns rise time compliance for high-speed µP reset handshaking.

Reset assertion occurs on VCC drop below 4.63V ±2.5%, MR low pulse ≥1.5µs, or WDI inactivity beyond 1.6s. The device ignores negative VCC transients ≤4µs duration at 100mV under threshold and draws only 5µA typical supply current at 3.6V, enabling use in battery-powered instrumentation and portable controllers.

Key Specifications

Pinout & Package

MAX6316MUK47BY is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, with lead-free marking "+T" option available. Pin 1 is marked via laser top-side code "ACDF" per Maxim standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316MUK47BY, MAX6316MUK46CY-T offers identical supervision functionality with legacy packaging, while TPS3808G33DBVR provides lower-cost basic reset supervision but omits bidirectional interface, manual reset, and 4.63V threshold precision-making it inadequate for applications requiring reset-source discrimination or 4.6V rail monitoring.

Availability

MAX6316MUK47BY is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, automotive body control modules, and smart energy meters requiring stable component supply with guaranteed long-term availability 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6316–MAX6322 family was designed specifically to provide robust, low-power µP supervision with configurable reset thresholds, watchdog timing, and specialized output types-including bidirectional interfaces for legacy microcontrollers-targeting reliability-critical embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6316MUK47BY?

The MAX6316MUK47BY has a factory-trimmed nominal reset threshold of 4.63V, with tolerance of ±2.5% over the full –40°C to +125°C temperature range. This value is confirmed in Table 1 and Standard Versions table of the Maxim datasheet, where "47" in the part number maps to 4.63V (e.g., MAX63___47_ _-T). The device guarantees reset assertion when VCC falls below this threshold and deassertion only after VCC rises above it plus the 140ms timeout period.

Does MAX6316MUK47BY support bidirectional reset functionality, and how does it differ from open-drain alternatives?

Yes, MAX6316MUK47BY features a true bidirectional active-low reset output designed explicitly for microprocessors like the Motorola 68HC11. Unlike open-drain outputs, it integrates both a 4.7kΩ internal pullup resistor and an active P-channel FET that engages during RESET rise to ensure sub-500ns transition time-even with 300pF bus capacitance. This allows the µP to distinguish between internally and externally asserted resets, a capability absent in open-drain supervisors such as MAX6320P.

What is the watchdog timeout period for MAX6316MUK47BY, and how is it configured?

The MAX6316MUK47BY has a typical watchdog timeout period of 1.6s, corresponding to the "Y" suffix in the ordering nomenclature (per Table 3). This value is factory-programmed and non-adjustable. The watchdog timer is cleared by any rising or falling edge on the WDI pin; if no edge occurs within 1.6s, RESET is asserted. Leaving WDI unconnected disables the watchdog function entirely, as the internal timer is serviced automatically at 7/8 of the nominal period.

Can MAX6316MUK47BY operate reliably during severe power supply transients?

Yes, MAX6316MUK47BY is specifically designed to ignore fast negative VCC transients: it remains immune to pulses as short as 4µs duration when the dip is ≤100mV below the 4.63V threshold. This immunity is verified in Figure 6 of the datasheet (MAX6316toc06) and enables stable operation in electrically noisy environments such as motor drives or automotive systems-without requiring additional filtering beyond a standard 0.1µF VCC bypass capacitor.

What are the absolute maximum ratings for VCC and RESET pins on MAX6316MUK47BY?

The MAX6316MUK47BY specifies an absolute maximum VCC rating of –0.3V to +6V, and RESET pin voltage must remain within –0.3V to (VCC + 0.3V). Exceeding these limits risks permanent damage. These values are documented in the Absolute Maximum Ratings table (page 2 of datasheet). Notably, RESET is rated for operation down to VCC = 1V, and the device guarantees valid logic levels on RESET throughout that range-unlike many competitors that fail below 2.0V.