Analog Devices Inc./Maxim Integrated MAX6314US26D1+T

Overview

MAX6314US26D1+T 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, 1ms minimum reset timeout period, 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 MAX6314US26D1+T datasheet, MAX6314US26D1+T pinout, MAX6314US26D1+T application, or MAX6314US26D1+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), bidirectional RESET output architecture with integrated 4.7kΩ pullup + active P-channel transistor, immunity to short VCC transients, MR input glitch rejection (100ns), and compatibility with systems requiring manual reset debouncing without external components.

Technical Context

The MAX6314US26D1+T implements a precision voltage-monitoring comparator with laser-trimmed resistive divider to detect VCC falling below 2.63V ±2.5%, triggering an internally timed reset assertion. Its RESET output combines an N-channel pulldown, a 4.7kΩ passive pullup, and a P-channel active pullup enabled for 2µs after RESET release - enabling fast rise time (<350ns typical at 100pF) even with multiple devices on the bus.

It integrates a transition edge flip-flop and one-shot timer to manage reset timing, supports manual reset via MR (with internal 63kΩ pullup), and maintains RESET validity down to VCC = 1V. The device operates across -40°C to +85°C and draws only 5µA at +25°C, making it suitable for low-power embedded monitoring.

Key Specifications

Pinout & Package

SOT143 package: 4-pin, surface-mount, lead-free (RoHS-compliant), -40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US26D1+T, MAX6315US26D1+T removes bidirectional capability but simplifies layout for unidirectional use, while TPS3808G125DBVR offers lower current and programmable timing at the cost of threshold inflexibility and different pinout - neither is pin-compatible, but both serve adjacent supervisory roles in cost- or power-sensitive designs.

Availability

MAX6314US26D1+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart meter communication cards, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6314US26D1+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6314 series is part of Maxim's precision supervisory IC portfolio, designed specifically for reliable power-on reset, brownout detection, and manual reset integration in resource-constrained µP systems - emphasizing low power, small size, and robust noise immunity.

FAQ

What is the exact reset threshold voltage of the MAX6314US26D1+T?

The MAX6314US26D1+T has a factory-trimmed nominal reset threshold 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 Electrical Characteristics table under "Reset Threshold (Note 1)" - confirming its suitability for monitoring 2.7V–3.3V logic supplies where precise brownout detection is critical. The MAX6314US26D1+T does not require external adjustment.

Does the MAX6314US26D1+T support bidirectional reset arbitration like the 68HC11?

Yes, the MAX6314US26D1+T is explicitly designed for bidirectional reset arbitration with µPs such as the Motorola 68HC11. Its RESET output integrates both an N-channel pulldown and a parallel 4.7kΩ pullup plus P-channel active pullup, allowing the µP to drive RESET low and the supervisor to do the same - enabling the µP to distinguish between internal and external reset sources by sampling RESET state after release. This behavior is confirmed in the Functional Diagram and Detailed Description sections of the datasheet.

What is the minimum reset timeout period for the MAX6314US26D1+T?

The MAX6314US26D1+T has a minimum reset timeout period of 1ms, as indicated by the "D1" suffix in its ordering code and verified in the Ordering Information table. This timeout begins after VCC rises above 2.63V or after MR is deasserted, and ensures the reset signal remains asserted long enough for safe microprocessor initialization. The actual timeout may vary slightly with temperature but remains ≥1ms under all conditions per specification.

Can the MR pin of the MAX6314US26D1+T be left floating?

Yes, the MR pin of the MAX6314US26D1+T can be left floating because it features an internal 63kΩ pullup resistor, as documented in the Pin Description and Applications Information sections. When unused, MR requires no external components. For manual reset functionality, connect a normally open momentary switch from MR to GND - no external debounce circuitry is needed due to the device's built-in 100ns glitch rejection.

Is the MAX6314US26D1+T RoHS-compliant and lead-free?

Yes, the MAX6314US26D1+T is RoHS-compliant and supplied in lead-free packaging, as confirmed by the Ordering Information footnote stating "Specify lead-free by replacing '-T' with '+T' when ordering" - and the "+T" suffix in the part number itself. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for SOT143 and is qualified for reflow soldering per industry standards.