Analog Devices Inc./Maxim Integrated MAX6314US26D3

Overview

MAX6314US26D3 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., 68HC11). It features a factory-trimmed 2.63V reset threshold, 140ms minimum reset timeout period, ±2.5% threshold accuracy over temperature, 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 MAX6314US26D3 datasheet, MAX6314US26D3 pinout, MAX6314US26D3 application, or MAX6314US26D3 equivalent, key selection considerations include its bidirectional RESET output architecture, integrated 4.7kΩ pull-up + active P-channel pull-up, manual reset input with internal 63kΩ pull-up, immunity to short VCC transients, and compatibility with systems requiring precise reset timing without external components.

Technical Context

The MAX6314US26D3 implements a precision voltage-monitoring comparator with laser-trimmed resistive divider to detect VCC falling below 2.63V (±2.5% over –40°C to +85°C), triggering a reset assertion that persists for ≥140ms after VCC recovers. Its RESET output combines an N-channel pulldown, a 4.7kΩ passive pull-up, and a 2µs active P-channel pull-up to ensure fast low-to-high transition on shared reset buses-even with multiple devices and stray capacitance.

It includes a debounced manual reset input (MR) with internal 63kΩ pull-up, supporting direct switch connection to GND. The device operates across VCC = 1.0V to 5.5V, draws only 5µA at +25°C, and remains functional down to VCC = 1V (RESET sinks current), with guaranteed logic-low RESET output for VCC > 1V.

Key Specifications

Pinout & Package

SOT143 package: 4-pin, surface-mount, -40°C to +85°C operating range, lead-free compatible (replace "-T" with "+T" for RoHS-compliant ordering).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US26D3, MAX6315US26D3 lacks the integrated pull-up and active pull-up transistor, making it incompatible with 68HC11-style bidirectional reset detection; TPS3808G26DBVR offers lower quiescent current but omits manual reset and requires PCB redesign due to different pin count and function mapping.

Availability

MAX6314US26D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart utility meters, and automotive body control units requiring stable component supply, long-lifecycle support, and guaranteed factory-trimmed performance.

Supply support for MAX6314US26D3 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 and mixed-signal ICs for power, sensing, and interface applications, with emphasis on high-reliability, low-power, and small-footprint solutions.

The MAX6314 family delivers cost-effective, single-function µP supervisory circuits optimized for battery-powered and industrial systems needing deterministic reset timing, manual reset capability, and immunity to supply transients-without external passive components.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6314US26D3?

The MAX6314US26D3 has a factory-trimmed nominal reset threshold of 2.63V, with ±2.5% accuracy over the full operating temperature range of –40°C to +85°C. This value is laser-trimmed during manufacturing and specified in the Electrical Characteristics table under "Reset Threshold (Note 1)" with test conditions confirming VTH = 2.63V ±2.5%.

Does MAX6314US26D3 support bidirectional reset communication with microcontrollers like the 68HC11?

Yes, MAX6314US26D3 explicitly supports bidirectional reset interfaces. Its RESET pin integrates an N-channel pulldown, a 4.7kΩ passive pull-up, and a 2µs active P-channel pull-up-enabling µPs such as the 68HC11 to pull the line low for self-reset detection while ensuring fast, reliable high-state recovery even with multiple devices on the bus.

What is the minimum reset timeout period for MAX6314US26D3, and how is it implemented?

The MAX6314US26D3 provides a minimum reset timeout period of 140ms. This is an internally programmed, fixed-duration interval generated by an on-chip timer that begins counting when VCC rises above 2.63V or when the MR input is deasserted. The timeout is guaranteed minimum-not typical-and ensures sufficient time for µP and peripheral initialization before release.

Can MAX6314US26D3 operate with supply voltages below 2.63V, and what happens to RESET output?

Yes, MAX6314US26D3 operates with VCC as low as 1.0V. When VCC falls below 1.0V, the RESET output becomes high-impedance (open-circuit) and no longer sinks current. For applications requiring RESET to remain valid down to 0V, a 100kΩ pull-down resistor to GND is recommended-per Figure 3 in the datasheet-to prevent floating states.

Is there an internal pull-up on the MR pin of MAX6314US26D3, and what is its value?

Yes, MAX6314US26D3 includes a 63kΩ internal pull-up resistor on the MR pin. This allows the pin to be left unconnected (NC) when manual reset is not required. To implement manual reset, connect a normally open momentary switch between MR and GND-no external components are needed for basic functionality.