Analog Devices Inc./Maxim Integrated MAX6315US29D4-T

Overview

MAX6315US29D4-T from Analog Devices is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an open-drain reset signal when voltage falls below 2.93V or upon manual reset assertion. It provides a guaranteed 1120ms minimum reset timeout period, consumes only 5μA typical supply current at 5.5V, and operates across -40°C to +125°C for use in battery-powered industrial controllers.

For engineers reviewing the MAX6315US29D4-T datasheet, MAX6315US29D4-T pinout, MAX6315US29D4-T application, or MAX6315US29D4-T equivalent, key selection factors include factory-trimmed 2.93V reset threshold, 1120ms timeout at full temperature range, open-drain RESET output compatible with voltages up to 6V, and SOT23-4 package compatibility with space-constrained embedded designs.

Technical Context

The MAX6315US29D4-T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider setting nominal VTH = 2.93V ±3.5% over -40°C to +125°C, and integrates a monolithic timer circuit that guarantees ≥1120ms reset assertion after VCC recovery or MR deassertion. Its MR input includes 63kΩ internal pullup and 100ns glitch rejection.

This device uses an open-drain n-channel MOSFET for RESET output, enabling level-shifting-e.g., monitoring a 3.3V rail while pulling RESET up to 5V-without external level translators. Immunity to short VCC transients is ensured by comparator overdrive response validated down to 35μs power-down delay.

Key Specifications

Pinout & Package

Supplied in a 4-pin SOT23 package (U4+1 outline), footprint-compatible with industry-standard 0.95mm pitch land pattern 90-0183.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6315US29D3-T and TPS3808G33DBVR, the MAX6315US29D4-T uniquely delivers 2.93V precision threshold with longest standard timeout (1120ms), enabling robust initialization in slow-ramping industrial power supplies while maintaining pin- and footprint-compatibility with other MAX6315 variants.

Availability

MAX6315US29D4-T is available at Aetrix Electronics and suitable for industrial motor controllers, battery-powered data loggers, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6315US29D4-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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The MAX6315 family is designed specifically for microprocessor supervisory functions in harsh-environment embedded systems, delivering factory-trimmed accuracy, ultra-low power, and wide-temperature operation without external components.

FAQ

What is the exact reset threshold voltage of the MAX6315US29D4-T?

The MAX6315US29D4-T has a factory-trimmed nominal reset threshold voltage of 2.93V, with tolerance of ±3.5% over the full -40°C to +125°C operating temperature range. This value is laser-trimmed during manufacturing and does not require external calibration. The MAX6315US29D4-T datasheet specifies V_TH = 2.93V ±3.5% under worst-case conditions, making it suitable for precise 3V system monitoring.

How long is the reset timeout period for the MAX6315US29D4-T?

The MAX6315US29D4-T guarantees a minimum reset timeout period of 1120ms after VCC rises above the 2.93V threshold or after the manual reset (MR) signal is deasserted. This value is specified at both -40°C to +85°C and -40°C to +125°C temperature ranges, with typical values reaching up to 2240ms at room temperature. The MAX6315US29D4-T uses an internal monolithic timer to ensure this timing consistency without external capacitors.

Can the MAX6315US29D4-T's RESET output be pulled up to a voltage higher than VCC?

Yes, the MAX6315US29D4-T features an open-drain RESET output rated for voltages up to +6.0V, allowing it to be pulled up to a rail higher than its own VCC supply. For example, it can monitor a 3.3V VCC while pulling RESET to a 5V logic domain. This capability is explicitly confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the MAX6315US29D4-T datasheet, supporting level-shifted reset signaling in mixed-voltage systems.

Does the MAX6315US29D4-T require an external pullup resistor on the RESET pin?

Yes, the MAX6315US29D4-T requires an external pullup resistor on the RESET pin because its output is open-drain. A 10kΩ resistor is recommended for most applications, connecting RESET to the target logic rail (e.g., 3.3V or 5V). The MAX6315US29D4-T datasheet specifies VOL ≤ 0.4V at ISINK = 3.2mA, confirming that the internal MOSFET can reliably sink sufficient current to maintain a valid logic-low state when the pullup is correctly sized.

What is the supply current consumption of the MAX6315US29D4-T?

The MAX6315US29D4-T draws only 5μA typical supply current at VCC = 5.5V and TA = +25°C, rising to 15μA maximum at +125°C. At 3.6V, typical current is 4μA (–40°C to +85°C) and 12μA (–40°C to +125°C). This ultra-low ICC enables multi-year operation in battery-powered applications such as wireless sensors and portable medical devices, and is a key specification verified across temperature in the MAX6315US29D4-T Electrical Characteristics table.