Analog Devices Inc./Maxim Integrated MAX6314US46D2

Overview

MAX6314US46D2 from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit designed to monitor VCC supply voltage and assert a bidirectional reset signal for µPs with compatible reset I/Os (e.g., Motorola 68HC11). It features a factory-trimmed 4.63V reset threshold, 20ms minimum reset timeout period, ±1.8% threshold accuracy at +25°C, 5µA supply current, and SOT143 package. It is used in portable/battery-powered equipment requiring reliable power-on and brownout reset control.

For engineers reviewing the MAX6314US46D2 datasheet, MAX6314US46D2 pinout, MAX6314US46D2 application, or MAX6314US46D2 equivalent, key selection criteria include bidirectional RESET compatibility, precise 4.63V threshold tolerance, 20ms timeout timing, immunity to short VCC transients, and absence of external pull-up components.

Technical Context

The MAX6314US46D2 implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 4.63V reset threshold, and integrates a monostable timer that guarantees RESET remains asserted for ≥20ms after VCC rises above threshold or manual reset deassertion. Its RESET output combines a 4.7kΩ passive pull-up resistor with a p-channel active pull-up transistor enabled for 2µs during low-to-high transitions - enabling fast rise times even under high capacitive load conditions typical in multi-device reset buses.

This architecture directly supports bidirectional reset protocols used by the 68HC11 and similar µPs: the device detects whether RESET is pulled low by the µP itself (self-reset) or by external sources (supervisor-initiated), allowing differentiated reset vector handling. MR input includes a 63kΩ internal pull-up and accepts logic-low manual reset pulses without external debounce circuitry.

Key Specifications

Pinout & Package

SOT143 (4-pin, surface-mount) package with exposed pad option; footprint compatible with JEDEC MO-178AC standard. Thermal performance optimized for industrial temperature range (-40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US46D2, MAX6315US46D2 omits the active pull-up circuitry-reducing complexity but eliminating bidirectional protocol support-while TPS3808G33DBVR trades threshold flexibility and pin compatibility for ultra-low current and adjustable timing, making neither a drop-in replacement.

Availability

MAX6314US46D2 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, handheld test equipment, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6314US46D2 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 analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6314 series was developed specifically to address bidirectional reset interface challenges in µP-based systems-enabling reliable reset source discrimination without external components or layout compromises.

FAQ

What is the exact reset threshold voltage of the MAX6314US46D2?

The MAX6314US46D2 has a factory-trimmed nominal reset threshold voltage of 4.63V, with ±1.8% accuracy at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during manufacturing and specified in the Ordering Information table as "NOMINAL VTH (V) = 4.63".

Does the MAX6314US46D2 require an external pull-up resistor on the RESET pin?

No, the MAX6314US46D2 does not require an external pull-up resistor. It integrates a 4.7kΩ pull-up resistor in parallel with a p-channel active pull-up transistor on the RESET pin, enabling direct interface with bidirectional reset I/Os like those found on the Motorola 68HC11. This eliminates the need for external components in standard configurations.

What is the minimum reset timeout period for the MAX6314US46D2?

The MAX6314US46D2 has a minimum reset timeout period (t_RP) of 20ms. This internally programmed delay ensures RESET remains asserted for at least 20ms after VCC rises above 4.63V or after the manual reset (MR) input is deasserted, providing sufficient time for µP initialization.

Can the MAX6314US46D2 be used with microcontrollers other than the 68HC11?

Yes, the MAX6314US46D2 can be used with any microcontroller featuring a bidirectional reset I/O pin that follows the same protocol as the 68HC11 - i.e., one that pulls RESET low for ~4 E-clock cycles, releases it, waits ~2 E-clock cycles, then samples RESET's state to determine reset source. Compatibility depends on timing and electrical behavior, not brand.

Is the MR input of the MAX6314US46D2 debounced internally?

Yes, the MR input of the MAX6314US46D2 is internally debounced. The device includes glitch rejection of up to 100ns and a minimum MR input pulse width requirement of 1µs, allowing direct connection of a momentary switch from MR to GND without external RC filtering or digital debounce circuitry.