Analog Devices Inc. ADM6315-31D2ARTZR7

Overview

ADM6315-31D2ARTZR7 from Analog Devices is a precision open-drain microprocessor supervisory circuit in SOT-143 package, monitoring 3.08 V supply with ±2.5% threshold accuracy over −40°C to +85°C, 20 ms minimum reset timeout, 5 μA typical supply current, and reset assertion down to VCC > 1 V. It serves as a system-level power integrity guard in embedded controllers requiring reliable brownout detection and manual reset capability.

For engineers reviewing the ADM6315-31D2ARTZR7 datasheet, ADM6315-31D2ARTZR7 pinout, ADM6315-31D2ARTZR7 application, or ADM6315-31D2ARTZR7 equivalent, key selection criteria include reset threshold tolerance, temperature range (−40°C to +125°C), manual reset input timing, open-drain output drive capability, and compatibility with low-voltage microcontrollers operating at 3.3 V or 5 V.

Technical Context

The ADM6315-31D2ARTZR7 integrates a precision voltage reference comparator with hysteresis, debounced manual reset input (MR), and open-drain RESET output. Its internal reference enables 3.08 V trip point with ±2.5% accuracy across −40°C to +85°C and ±3.5% up to +125°C.

It delivers 20 ms minimum reset timeout after VCC rise or MR release, supports reset assertion during VCC fall below threshold (35 μs typical delay), and accepts MR pulses ≥1 μs while rejecting transients <100 ns - enabling robust operation in electrically noisy automotive and industrial environments.

Key Specifications

Pinout & Package

ADM6315-31D2ARTZR7 is housed in a 4-lead SOT-143 package (RA-4), measuring 2.9 mm × 1.6 mm × 1.15 mm, optimized for space-constrained PCB layouts and automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US31D2+T and TPS3808G33DBVR, ADM6315-31D2ARTZR7 uniquely combines 3.08 V precision threshold, integrated MR debounce, open-drain output, and full −40°C to +125°C qualification - making it optimal for safety-critical systems demanding exact brownout detection and field-serviceable reset capability.

Availability

ADM6315-31D2ARTZR7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and smart energy meter MCU subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM6315-31D2ARTZR7 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 since 1965.

The ADM6315 family was designed specifically for robust, low-power microprocessor supervision in harsh environments - delivering precision voltage monitoring, glitch-immune manual reset, and guaranteed reset timing across automotive and industrial temperature grades.

FAQ

What is the exact reset threshold voltage of ADM6315-31D2ARTZR7 and how does it vary with temperature?

The ADM6315-31D2ARTZR7 has a nominal reset threshold of 3.08 V, with tolerance of ±2.5% over −40°C to +85°C and ±3.5% over −40°C to +125°C. This specification is confirmed in Table 1 and Table 5 of the Rev. I datasheet. The device uses an internal bandgap reference to maintain stability, and its temperature coefficient is 60 ppm/°C - meaning threshold drift is predictable and bounded across the full operating range. ADM6315-31D2ARTZR7 is therefore suitable for applications where consistent 3.3 V rail monitoring is required despite ambient fluctuations.

Does ADM6315-31D2ARTZR7 support manual reset, and what are the electrical requirements for the MR pin?

Yes, ADM6315-31D2ARTZR7 includes a dedicated MR (Manual Reset) input (Pin 3) that is active-low and internally debounced. The MR pin accepts input pulses ≥1 μs in duration and rejects transients <100 ns. Its logic thresholds are defined as 0.3 × VCC (VIL) and 0.7 × VCC (VIH) when VTH < 4 V - fully compatible with standard 3.3 V CMOS levels. When unused, MR may be left floating due to the internal 63 kΩ pull-up resistor. ADM6315-31D2ARTZR7 thus simplifies system-level reset control without external components.

What is the minimum reset timeout period for ADM6315-31D2ARTZR7, and is it guaranteed across temperature?

The ADM6315-31D2ARTZR7 provides a minimum reset timeout of 20 ms after VCC rises above the 3.08 V threshold or after the MR pin is released. This value is guaranteed across −40°C to +85°C (20 ms min) and −40°C to +125°C (16 ms min), per Table 1 in the datasheet. The timeout is generated by an internal RC timer and remains stable regardless of VCC variation within the 1 V to 5.5 V operating range - ensuring reliable processor initialization timing in ADM6315-31D2ARTZR7-based designs.

Can ADM6315-31D2ARTZR7 operate with supply voltages below 3.3 V, and what is its lowest functional VCC?

Yes, ADM6315-31D2ARTZR7 operates from VCC = 1 V to 5.5 V and asserts RESET down to VCC > 1 V - meaning it remains functional and capable of generating a valid reset signal even during severe brownout conditions. At VCC = 1 V, the RESET output can sink 80 μA while maintaining ≤0.3 V voltage drop, satisfying low-voltage logic interface requirements. This capability makes ADM6315-31D2ARTZR7 especially valuable in battery-powered systems where supply collapse must be detected early and reliably.

Is ADM6315-31D2ARTZR7 pin-compatible with other supervisory ICs, and which ones are explicitly documented?

Yes, ADM6315-31D2ARTZR7 is explicitly documented as pin-compatible with the ADM811 in the datasheet Features section. Both share identical 4-lead SOT-143 (RA-4) pinout: GND (Pin 1), RESET (Pin 2), MR (Pin 3), VCC (Pin 4). No PCB layout changes are required when migrating from ADM811 to ADM6315-31D2ARTZR7. However, ADM6315-31D2ARTZR7 offers tighter threshold accuracy (±2.5% vs. ±3.5% for ADM811), lower quiescent current (5 μA vs. 8 μA typ), and extended temperature range (−40°C to +125°C vs. −40°C to +85°C).