Analog Devices Inc./Maxim Integrated MAX6316MUK46AY

Overview

MAX6316MUK46AY 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 integrity and µP activity in embedded control systems, asserting reset during brownout, software hang, or manual trigger - guaranteed valid down to VCC = 1V.

For engineers reviewing the MAX6316MUK46AY datasheet, MAX6316MUK46AY pinout, MAX6316MUK46AY application, or MAX6316MUK46AY equivalent, key selection factors include its bidirectional reset interface for Motorola 68HC11-compatible systems, immunity to sub-4µs VCC transients, internal 4.7kΩ pullup + active P-channel pullup, and -40°C to +125°C operation without external components.

Technical Context

The MAX6316MUK46AY implements a dual-stage reset generator with voltage monitoring and watchdog timer logic. Its bidirectional RESET output combines a 4.7kΩ passive pullup resistor and an active P-channel FET enabled above 0.65V (VPTH), ensuring fast low-to-high transition (<666ns at CL=400pF) even with multiple devices on the bus.

Watchdog functionality clears on any WDI edge (rising or falling) or reset assertion; timeout is factory-set to 1.6s (Y-suffix). Manual reset (MR) input features 52kΩ internal pullup, 100ns glitch rejection, and compatibility with TTL/CMOS logic levels - asserted low to force reset for full tRP duration.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (1.6mm × 2.9mm × 1.1mm), RoHS-compliant, lead-free (indicated by "+T" suffix; this part uses "-T" per ordering info).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK46AY and TPS3808G33DBVR, the MAX6316MUK46AY uniquely delivers bidirectional reset arbitration for legacy µPs while maintaining identical 4.63V threshold and 140ms/1.6s timing - making it irreplaceable in Motorola 68HC11-based designs requiring fault-source identification.

Availability

MAX6316MUK46AY 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 across extended temperature ranges and long production lifecycles.

Supply support for MAX6316MUK46AY 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 high-reliability embedded systems requiring robust power-on reset, brownout protection, and software watchdog supervision - especially where µP self-diagnostics and transient immunity are critical.

FAQ

What is the exact reset threshold voltage of the MAX6316MUK46AY?

The MAX6316MUK46AY 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 Table 2 of the datasheet, and corresponds to the "46" suffix in the part number. The MAX6316MUK46AY is specifically calibrated for 5V-system supervision with appropriate margin below nominal rail.

Does the MAX6316MUK46AY require external components to operate?

No, the MAX6316MUK46AY requires no external components for basic operation. It integrates a factory-trimmed voltage divider for 4.63V threshold detection, internal 52kΩ pullup on MR, 4.7kΩ passive pullup plus active P-channel FET on RESET, and a fully self-contained watchdog timer. Only decoupling capacitance (e.g., 0.1µF near VCC) is recommended for noise immunity - no timing resistors or capacitors are needed.

How does the bidirectional reset output of the MAX6316MUK46AY work with the Motorola 68HC11?

The MAX6316MUK46AY's bidirectional RESET output enables the Motorola 68HC11 to distinguish between external and internal reset sources. After reset, the µP releases RESET, waits two clock cycles, then samples its state: low indicates external cause (e.g., MAX6316MUK46AY assertion), high indicates self-assertion. The MAX6316MUK46AY's active pullup ensures RESET reaches 0.8×VCC within the tight timing window - a capability standard open-drain or push/pull outputs lack.

What is the watchdog timeout period for the MAX6316MUK46AY, and how is it configured?

The MAX6316MUK46AY has a typical watchdog timeout period of 1.6s, corresponding to the "Y" suffix in its ordering code. This value is factory-programmed and non-adjustable. The watchdog timer clears on any rising or falling edge at the WDI pin or during reset assertion. Leaving WDI unconnected disables watchdog functionality via internal periodic servicing - no external pullup or pulldown is required.

Is the MAX6316MUK46AY qualified for automotive applications?

The MAX6316MUK46AY is not automotive-qualified. Per the datasheet's Ordering Information section, automotive-grade versions are denoted by a "/V" suffix (e.g., MAX6316MUK46AY/V). This part uses the standard "-T" suffix, indicating commercial/industrial grade with -40°C to +125°C operation - suitable for under-hood automotive *body* modules but not AEC-Q100-certified for safety-critical powertrain or ADAS applications.