Analog Devices Inc./Maxim Integrated MAX6314US46D2+

Overview

MAX6314US46D2+ from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit designed to monitor V_CC 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. Used in portable equipment and critical µP power monitoring.

For engineers reviewing the MAX6314US46D2+ datasheet, MAX6314US46D2+ pinout, MAX6314US46D2+ application, or MAX6314US46D2+ equivalent, key selection criteria include bidirectional RESET compatibility, precise 4.63V V_TH, 20ms t_RP, immunity to short V_CC transients, and absence of external 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 an internal one-shot timer that enforces a guaranteed-minimum 20ms reset assertion after V_CC recovery or manual reset deassertion. Its RESET output combines a 4.7kΩ pull-up resistor with a p-channel active pull-up transistor to ensure fast low-to-high transition under capacitive load - critical for reliable reset source identification on bidirectional µP reset pins.

It includes a debounced manual reset input (MR) with 63kΩ internal pull-up, supports operation from 2.5V to 5.5V, and maintains RESET assertion down to V_CC = 1V. The device is immune to V_CC transients ≤100µs (at 4.63V threshold), and exhibits ±2.5% reset threshold accuracy over –40°C to +85°C.

Key Specifications

Pinout & Package

SOT143 package: 4-pin, surface-mount, lead-free compatible (designated by '+' suffix), footprint optimized for space-constrained PCBs.

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 transistor-increasing rise time risk on capacitive reset buses-while TPS3808G33DBVR targets 3.3V systems and cannot replace the precise 4.63V threshold or MR-integrated debounce of the MAX6314US46D2+ in 5V industrial designs.

Availability

MAX6314US46D2+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production 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 high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.

The MAX6314 family was designed specifically for reliable, low-component-count µP supervision in space- and power-constrained systems, emphasizing precision voltage thresholds, bidirectional reset compatibility, and transient immunity.

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 range. This value is laser-trimmed during production and specified in the Ordering Information table; it is not adjustable or user-configurable. The 4.63V threshold aligns with common 5V system brownout detection requirements.

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

No, the MAX6314US46D2+ does not require an external pull-up resistor. Its RESET output integrates a 4.7kΩ passive pull-up resistor in parallel with a p-channel active pull-up transistor. This dual-stage structure ensures fast low-to-high transition times-even under 300pF bus capacitance-eliminating the need for external components while supporting bidirectional reset protocols like those used by the 68HC11.

What is the minimum reset timeout period for the MAX6314US46D2+?

The MAX6314US46D2+ provides a minimum reset timeout period (t_RP) of 20ms. This is the guaranteed minimum duration that the RESET output remains asserted after V_CC rises above 4.63V or after the MR input is deasserted. The actual timeout may be longer due to process variation but will never fall below 20ms, ensuring robust µP initialization across temperature and voltage conditions.

Can the MAX6314US46D2+ interface with microcontrollers other than the 68HC11?

Yes, the MAX6314US46D2+ can interface with any microcontroller featuring a bidirectional reset I/O pin that follows a similar timing-based source-identification protocol (e.g., sampling RESET state after a defined delay). While explicitly validated for the 68HC11, its electrical characteristics-including 0.8V MR input threshold, 4.7kΩ RESET pull-up, and active pull-up timing-make it compatible with other µPs requiring deterministic reset source discrimination without external circuitry.

Is the MAX6314US46D2+ RoHS-compliant and lead-free?

Yes, the MAX6314US46D2+ is RoHS-compliant and supplied in lead-free packaging. The '+' suffix in the part number explicitly denotes lead-free construction per Maxim/Analog Devices' packaging standards. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for SOT143 and is qualified for reflow soldering per industry-standard profiles.