Analog Devices Inc./Maxim Integrated MAX6314US29D3-T

Overview

MAX6314US29D3-T from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit that monitors V_CC supply voltage and asserts a bidirectional RESET signal when voltage falls below 2.93V or upon manual reset assertion. It features a factory-trimmed 2.93V reset threshold, 140ms minimum reset timeout period, ±1.8% threshold accuracy at +25°C, and operates across -40°C to +85°C in SOT143 package. It is used for reliable power-on/power-down reset control in 68HC11-compatible µP systems.

For engineers reviewing the MAX6314US29D3-T datasheet, MAX6314US29D3-T pinout, MAX6314US29D3-T application, or MAX6314US29D3-T equivalent, this page delivers verified electrical parameters, bidirectional reset interface details, SOT143 terminal mapping, thermal performance data, and direct alternatives for µP reset supervision in battery-powered and industrial embedded designs.

Technical Context

The MAX6314US29D3-T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 2.93V reset threshold, and integrates an internal timer that guarantees RESET remains active for ≥140ms after V_CC recovers above threshold or MR deasserts. Its bidirectional RESET output combines a 4.7kΩ pull-up resistor with a P-channel active pull-up transistor, enabling fast low-to-high transitions on capacitive reset buses.

This architecture supports deterministic reset source identification in µPs like the 68HC11 by allowing the processor to sample RESET state after releasing it - distinguishing external (supervisor-initiated) from internal (watchdog or fault-initiated) resets. The device draws only 5µA typical supply current and rejects transients ≤100ns at 2.93V–V_CC overdrive.

Key Specifications

Pinout & Package

SOT143 (4-pin, surface-mount) package with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. RoHS-compliant lead-free version available as MAX6314US29D3+T.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP reset supervision applications.

Compared with MAX6314US29D3-T, MAX6315US29D3-T removes the bidirectional interface complexity but requires external components, while TPS3808G33DBVR reduces current draw and improves accuracy at the cost of losing manual reset and bidirectional compatibility - making MAX6314US29D3-T uniquely suited for legacy 68HC11 and multi-source reset bus designs.

Availability

MAX6314US29D3-T is available at Aetrix Electronics and suitable for industrial controllers, portable test instruments, medical diagnostic devices, and automotive infotainment ECUs requiring stable component supply, long-term lifecycle support, and guaranteed SOT143 packaging consistency.

Supply support for MAX6314US29D3-T 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 industrial, communications, and computing applications, with emphasis on high-reliability power management and interface solutions.

The MAX6314 family was engineered specifically for µP reset supervision in systems requiring bidirectional reset I/O compatibility, factory-trimmed voltage thresholds, and minimal external components - targeting cost-sensitive yet robust embedded control applications.

FAQ

What is the exact reset threshold voltage of the MAX6314US29D3-T?

The MAX6314US29D3-T has a factory-trimmed nominal reset threshold voltage of 2.93V, 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 confirmed in the Electrical Characteristics table of the official datasheet. The 2.93V threshold is specific to the "US29" variant and distinct from other members of the MAX6314 family.

Does the MAX6314US29D3-T support bidirectional reset communication with the 68HC11 microcontroller?

Yes, the MAX6314US29D3-T 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 in parallel with a 4.7kΩ resistor, enabling the µP to drive RESET low and the supervisor to assert reset - allowing the 68HC11 to distinguish external versus internal reset sources via timed sampling of the RESET line state.

What is the minimum reset timeout period specified for the MAX6314US29D3-T?

The MAX6314US29D3-T provides a minimum reset timeout period (t_RP) of 140ms, as indicated by the "D3" suffix in the part number. This guaranteed minimum duration ensures the microprocessor has sufficient time to stabilize clocks, initialize peripherals, and execute boot code before release from reset - critical for reliable startup in industrial and medical systems.

Can the MAX6314US29D3-T operate down to 1V supply voltage?

Yes, the MAX6314US29D3-T operates across a V_CC range of 1.0V to 5.5V. Its RESET output is guaranteed to sink current and remain valid down to V_CC = 1V. Below 1V, RESET becomes high-impedance; for applications requiring validity down to 0V, a 100kΩ pull-down resistor on the RESET line is recommended per the datasheet's Figure 3 guidance.

Is there a lead-free version of the MAX6314US29D3-T available?

Yes, the lead-free version of the MAX6314US29D3-T is designated MAX6314US29D3+T and uses the same SOT143 package. Per Maxim's ordering information, the "+T" suffix replaces "-T" to specify lead-free packaging, and both versions share identical electrical specifications, thermal ratings, and pinout. Tape-and-reel packaging is standard for both variants.