Analog Devices Inc./Maxim Integrated MAX6314US42D2

Overview

MAX6314US42D2 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 4.20V 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 reset and brownout protection.

For engineers reviewing the MAX6314US42D2 datasheet, MAX6314US42D2 pinout, MAX6314US42D2 application, or MAX6314US42D2 equivalent, key selection criteria include its bidirectional RESET output architecture, precise 4.20V threshold, 20ms timeout, immunity to short VCC transients, and compatibility with µPs requiring active pullup-assisted reset line rise time control.

Technical Context

The MAX6314US42D2 implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 4.20V nominal reset threshold, supported by ±2.5% accuracy over –40°C to +85°C. Its RESET output combines an n-channel pulldown, a p-channel active pullup transistor, and a 4.7kΩ passive pullup resistor-enabling fast low-to-high transition even under high capacitive load conditions typical of multi-device reset buses.

It integrates a monostable timer that guarantees RESET remains asserted for ≥20ms after VCC rises above 4.20V or after manual reset (MR) deassertion. MR includes a 63kΩ internal pullup and accepts logic-low pulses ≥1µs to trigger reset, with built-in glitch rejection (100ns) and noise immunity via optional 0.1µF bypass.

Key Specifications

Pinout & Package

SOT143 package: 4-pin, single-row, gull-wing lead frame; 1.3mm × 2.9mm body, 0.95mm height, 0.95mm lead pitch; rated for –40°C to +85°C operating temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US42D2, MAX6315US42D2-T lacks the integrated p-channel pullup needed for fast reset-line transitions on bidirectional µP inputs, while TPS3808G33DBVR offers lower current but targets 3.3V systems and requires external timing components for timeout adjustment-making MAX6314US42D2 optimal for 4.2V-threshold, bidirectional-reset, and zero-component-count implementations.

Availability

MAX6314US42D2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed parametric consistency across production lots.

Supply support for MAX6314US42D2 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, computing, and consumer applications.

The MAX6314 family delivers precision, low-power µP supervisory circuits optimized for systems requiring deterministic reset behavior, minimal external components, and compatibility with legacy and modern bidirectional reset architectures.

FAQ

What is the exact reset threshold voltage for MAX6314US42D2?

The MAX6314US42D2 has a factory-trimmed nominal reset threshold voltage of 4.20V, 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 of the datasheet.

Does MAX6314US42D2 support bidirectional reset interfaces like the Motorola 68HC11?

Yes, MAX6314US42D2 is explicitly designed for bidirectional reset I/Os. Its RESET pin integrates both an n-channel pulldown and a p-channel active pullup in parallel with a 4.7kΩ resistor-enabling µPs such as the 68HC11 to detect reset source (internal vs. external) by sampling RESET state after release, as described in the functional diagram and Detailed Description section.

What is the minimum reset timeout period for MAX6314US42D2?

The MAX6314US42D2 has a minimum reset timeout period (t_RP) of 20ms. This is the guaranteed duration RESET remains asserted after VCC rises above 4.20V or after MR is deasserted. The actual timeout may vary slightly with temperature but remains ≥20ms across –40°C to +85°C.

Can MAX6314US42D2 operate with supply voltages below 2.5V?

Yes, MAX6314US42D2 operates from V_CC = 1.0V to 5.5V. While its reset threshold is fixed at 4.20V, it continues to function as a supervisory device down to 1.0V-ensuring valid RESET output behavior (e.g., guaranteed low state) even during deep brownout recovery, though reset assertion only occurs when V_CC falls below 4.20V.

Is an external pullup resistor required for the RESET pin of MAX6314US42D2?

No, an external pullup resistor is not required for MAX6314US42D2. The device integrates a 4.7kΩ passive pullup resistor and a p-channel active pullup transistor on the RESET pin-designed to eliminate external components while ensuring fast rise time (<500ns under 390pF load) for reliable bidirectional reset communication.