Analog Devices Inc./Maxim Integrated MAX6315US30D4+T

Overview

MAX6315US30D4+T from Analog Devices is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an open-drain active-low RESET signal when voltage falls below 3.00V or when manual reset (MR) is asserted. It guarantees reset assertion for ≥1120ms after VCC recovery or MR release, operates from -40°C to +125°C, draws only 5μA at 5.5V, and uses a 4-pin SOT23 package for space-constrained embedded power monitoring.

For engineers reviewing the MAX6315US30D4+T datasheet, MAX6315US30D4+T pinout, MAX6315US30D4+T application, or MAX6315US30D4+T equivalent, key selection criteria include its factory-trimmed 3.00V reset threshold, guaranteed 1120ms minimum timeout over temperature, open-drain output capable of level-shifting above VCC, immunity to sub-100ns MR glitches, and compatibility with μP reset pins requiring debounced manual initiation.

Technical Context

The MAX6315US30D4+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistors setting a nominal 3.00V reset threshold (±3.5% over -40°C to +125°C), paired with a monolithic timer circuit generating a fixed 1120ms minimum reset timeout period. Its open-drain RESET output uses an n-channel MOSFET switch rated for 6V max pullup, enabling level-shifted reset signaling across supply domains.

Manual reset input (MR) features an internal 63kΩ pullup resistor, accepts logic-low pulses as short as 1μs, rejects transients <100ns, and propagates reset within 500ns. The device remains functional down to VCC = 1.0V and maintains RESET low until VCC exceeds 1V, ensuring reliable brownout detection in battery-powered systems.

Key Specifications

Pinout & Package

MAX6315US30D4+T is housed in a RoHS-compliant 4-pin SOT23 package (package code U4+1), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for high-density PCB layouts in portable and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6314US30D4+T, MAX6315US30D4+T offers simpler integration for unidirectional reset systems and lower cost; versus TPS3808G30DBVR, it adds critical MR functionality and open-drain flexibility at modest current penalty - making it the preferred choice for field-serviceable or multi-supply embedded systems.

Availability

MAX6315US30D4+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6315US30D4+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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and timing solutions.

The MAX6315 family was designed specifically for robust, low-power microprocessor supervision in space- and energy-constrained embedded systems - delivering factory-trimmed accuracy, guaranteed timeout, and integrated MR functionality without external components.

FAQ

What is the exact reset threshold voltage of MAX6315US30D4+T and how does it vary with temperature?

The MAX6315US30D4+T has a nominal reset threshold of 3.00V, factory-trimmed with ±1.8% tolerance at +25°C and ±3.5% over the full -40°C to +125°C operating range. Its tempco is 60ppm/°C, meaning threshold drift is bounded and predictable - critical for systems where brownout detection must remain accurate across thermal extremes without calibration.

Does MAX6315US30D4+T require external components to operate?

No, MAX6315US30D4+T requires no external components for basic operation: the 3.00V threshold and 1120ms timeout are factory-programmed, MR includes a 63kΩ internal pullup, and RESET is open-drain with defined sink capability. Only an external pullup resistor (e.g., 10kΩ) on RESET is needed - eliminating trimming resistors, capacitors, or discrete logic traditionally used in reset circuits.

Can MAX6315US30D4+T's RESET output be pulled up to a voltage higher than its VCC supply?

Yes, MAX6315US30D4+T's open-drain RESET output is rated for up to 6.0V, allowing it to be pulled up to a higher-voltage rail (e.g., 5V) while monitoring a lower VCC (e.g., 3.3V). This enables level-shifted reset signaling - essential when coordinating reset across multiple power domains in complex systems without additional level translators.

What is the minimum VCC voltage at which MAX6315US30D4+T guarantees RESET assertion?

MAX6315US30D4+T guarantees RESET remains asserted down to VCC = 1.0V, per its Electrical Characteristics table. Below 1.0V, the device may lose ability to sink current reliably at RESET. This 1.0V lower limit ensures robust brownout detection even during deep discharge of lithium-based batteries or severe line sags in industrial power supplies.

How does the manual reset (MR) input behave when left unconnected?

When left unconnected, MAX6315US30D4+T's MR pin is internally pulled up to VCC via a 63kΩ resistor, holding it at logic-high and disabling manual reset. No external pullup is required. If used, a normally open momentary switch from MR to GND provides clean, debounced reset initiation - leveraging the device's built-in 100ns glitch rejection to suppress contact bounce.