Analog Devices Inc./Maxim Integrated MAX6314US26D4

Overview

MAX6314US26D4 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 bidirectional reset I/Os (e.g., Motorola 68HC11). It features a factory-trimmed 2.63V reset threshold, 1120ms minimum reset timeout period, ±2.5% threshold accuracy over temperature, 5µA supply current, and SOT143 package. Used in portable/battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6314US26D4 datasheet, MAX6314US26D4 pinout, MAX6314US26D4 application, or MAX6314US26D4 equivalent, key selection criteria include bidirectional RESET compatibility, 2.63V VTH tolerance across -40°C to +85°C, 1120ms timeout for stable system initialization, immunity to short VCC transients, and elimination of external pull-up components.

Technical Context

The MAX6314US26D4 implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 2.63V reset threshold, supported by ±2.5% accuracy over full industrial temperature range. Its reset generator uses an internal timer to hold RESET low for ≥1120ms after VCC rises above threshold or MR deasserts.

RESET output combines a 4.7kΩ passive pull-up resistor with a p-channel active pull-up transistor enabled for 2µs after RESET transitions from low to high - enabling fast rise time (<35ns at C_L = 100pF) even with multiple devices on shared reset bus. MR input includes 63kΩ internal pull-up and 100ns glitch rejection.

Key Specifications

Pinout & Package

SOT143 package: 4-pin, single-ended, leaded or lead-free option; dimensions 1.3mm × 2.9mm × 1.0mm (height), thermal pad not present, rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US26D4, MAX6315US26D4 lacks the integrated bidirectional pull-up structure needed for 68HC11 compatibility, while TPS3808G33DBVR offers lower current but no MR pin or factory-set 2.63V threshold - making MAX6314US26D4 uniquely suited for legacy µP interfaces requiring precise 2.63V brownout detection and manual reset integration.

Availability

MAX6314US26D4 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed performance across -40°C to +85°C.

Supply support for MAX6314US26D4 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 family delivers precision voltage supervision with bidirectional reset capability, targeting legacy and cost-sensitive µP systems where compatibility with 68HC11-style reset architecture and minimal external components are essential design requirements.

FAQ

What is the exact reset threshold voltage of the MAX6314US26D4?

The MAX6314US26D4 has a factory-trimmed nominal reset threshold voltage of 2.63V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during production and specified in the Ordering Information table - distinct from other variants like MAX6314US25D4 (2.50V) or MAX6314US27D4 (2.70V).

Does the MAX6314US26D4 support bidirectional reset communication with the Motorola 68HC11?

Yes, the MAX6314US26D4 is explicitly designed for bidirectional reset compatibility with the Motorola 68HC11 and similar µPs. Its RESET pin integrates both an n-channel pulldown and a p-channel active pull-up with a 4.7kΩ resistor, enabling the µP to detect whether reset was initiated externally (by MAX6314US26D4) or internally (e.g., watchdog timeout) - a requirement for proper vector selection in 68HC11 firmware.

What is the minimum reset timeout period for the MAX6314US26D4?

The MAX6314US26D4 provides a minimum reset timeout period (t_RP) of 1120ms, as indicated by the "D4" suffix in the part number. This is the longest standard timeout offered in the MAX6314 family and ensures robust initialization of slow peripherals such as displays, modems, or encrypted storage controllers before firmware execution resumes.

Can the MAX6314US26D4 operate with supply voltages below 2.63V?

Yes, the MAX6314US26D4 operates from V_CC = 1.0V to 5.5V per Absolute Maximum Ratings and Electrical Characteristics tables. While it asserts RESET when V_CC falls below 2.63V, the device remains functional down to 1.0V - and RESET is guaranteed low for V_CC > 1V. Below 1V, RESET becomes high-impedance, requiring an external pull-down if validity to 0V is needed.

Is a manual reset input available on the MAX6314US26D4?

Yes, the MAX6314US26D4 includes a dedicated Manual Reset (MR) input (Pin 3) with internal 63kΩ pull-up resistance. A logic-low pulse on MR asserts RESET for the full 1120ms timeout period, even if V_CC remains stable. No external components are required - a momentary switch from MR to GND suffices, and optional 0.1µF capacitor to ground adds noise immunity in harsh environments.