Analog Devices Inc. ADM6315-31D4ARTRL7

Overview

ADM6315-31D4ARTRL7 from Analog Devices is a precision open-drain microprocessor supervisory circuit that monitors 3.08 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C, asserts reset for ≥1120 ms after power-up or brownout, and supports manual reset via debounced MR input. It operates down to VCC > 1 V and consumes only 5 μA typical supply current, making it suitable for battery-backed industrial controllers and automotive safety modules.

For engineers reviewing the ADM6315-31D4ARTRL7 datasheet, ADM6315-31D4ARTRL7 pinout, ADM6315-31D4ARTRL7 application, or ADM6315-31D4ARTRL7 equivalent, key selection criteria include its 3.08 V trip point, 1120 ms minimum reset timeout, SOT-143 package footprint, open-drain RESET output compatible with mixed-voltage systems, and guaranteed glitch immunity on MR input.

Technical Context

The ADM6315-31D4ARTRL7 implements a precision bandgap-based voltage reference comparator with temperature-compensated threshold (60 ppm/°C), enabling reliable detection of ≤1.8% supply degradation. Its internal timing circuit generates a fixed 1120 ms reset assertion window after VCC rises above 3.08 V or MR is released.

It features an open-drain RESET output capable of sinking up to 3.2 mA at VCC > 4.25 V, allowing direct interface with higher-voltage logic families. The MR input includes built-in 100 ns glitch rejection and accepts ≥1 μs pulses, supporting robust manual reset in noisy environments without external RC filtering.

Key Specifications

Pinout & Package

ADM6315-31D4ARTRL7 is housed in a 4-lead SOT-143 package (RA-4), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads optimized for automated assembly and thermal performance (θJA = 330°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US31D4+T and TPS3808G31DBVR, the ADM6315-31D4ARTRL7 offers open-drain flexibility for multi-supervisor systems and lower quiescent current (5 μA vs. 8 μA), but trades off tighter threshold accuracy and ESD immunity for cost-sensitive industrial deployments.

Availability

ADM6315-31D4ARTRL7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and medical infusion pump controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM6315-31D4ARTRL7 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 reliable power-on reset and brownout protection in space-constrained microprocessor systems, emphasizing precision threshold stability, ultra-low power, and noise-immune manual reset capability.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6315-31D4ARTRL7?

The ADM6315-31D4ARTRL7 has a nominal reset threshold of 3.08 V, with a tolerance of ±2.5% over the −40°C to +85°C temperature range and ±3.5% over −40°C to +125°C. This value is laser-trimmed at wafer test and specified in Table 1 of the Rev. I datasheet. The ADM6315-31D4ARTRL7 uses an internal bandgap reference to maintain stability against supply and process variation.

Does ADM6315-31D4ARTRL7 require an external pull-up resistor on the RESET pin?

Yes, ADM6315-31D4ARTRL7 features an open-drain RESET output and requires an external pull-up resistor to the target logic rail (e.g., 3.3 V or 5 V). The datasheet specifies a maximum sink current of 3.2 mA at VCC > 4.25 V, so a 10 kΩ pull-up is typical for 3.3 V systems. Without this resistor, the ADM6315-31D4ARTRL7 cannot assert a valid high logic level on RESET.

What is the minimum pulse width required on the MR input to trigger a reset with ADM6315-31D4ARTRL7?

The MR input of ADM6315-31D4ARTRL7 requires a minimum low-going pulse width of 1 μs to guarantee recognition, per Table 1 in the datasheet. Pulses shorter than 100 ns are rejected as glitches. This specification ensures reliable manual reset activation while rejecting noise in electrically harsh environments where the ADM6315-31D4ARTRL7 is commonly deployed.

Can ADM6315-31D4ARTRL7 operate with supply voltages below 2.5 V?

Yes, ADM6315-31D4ARTRL7 operates with VCC as low as 1 V, and reset assertion remains functional down to this level with 80 μA sink capability on RESET. However, the 3.08 V threshold is only valid when VCC ≥ 2.5 V; below that, the device enters undervoltage lockout and asserts RESET continuously. This behavior is documented in the Absolute Maximum Ratings and General Description sections.

Is ADM6315-31D4ARTRL7 pin-compatible with the ADM811 series?

Yes, ADM6315-31D4ARTRL7 is explicitly stated as pin-compatible with the ADM811 in the datasheet Features section. Both devices use the same 4-lead SOT-143 (RA-4) package and share identical pin assignments: Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC. No PCB layout changes are required when substituting ADM6315-31D4ARTRL7 for ADM811-31D4 variants in existing designs.