Analog Devices Inc. ADM6315-44D4ARTRL7

Overview

ADM6315-44D4ARTRL7 from Analog Devices is a precision open-drain microprocessor supervisory circuit in SOT-143 package, monitoring 4.39 V supply with ±3.5% threshold accuracy over −40°C to +125°C, featuring 1120 ms minimum reset timeout, 5 μA typical supply current, and built-in debounced manual reset input. It ensures reliable power-up, brownout, and system recovery in safety-critical embedded controllers.

For engineers reviewing the ADM6315-44D4ARTRL7 datasheet, ADM6315-44D4ARTRL7 pinout, ADM6315-44D4ARTRL7 application, or ADM6315-44D4ARTRL7 equivalent, key selection criteria include reset threshold tolerance at temperature extremes, open-drain output drive capability into varied rail voltages, manual reset pulse immunity (≥1 μs), and compatibility with legacy ADM811-based layouts.

Technical Context

The ADM6315-44D4ARTRL7 implements a bandgap-referenced voltage comparator with hysteresis and internal timing capacitor for fixed reset timeout. Its reset assertion occurs within 35 μs during VCC fall at 1 mV/μs, and it maintains RESET low for ≥1120 ms after VCC rises above 4.39 V or MR deasserts.

It features an open-drain RESET output capable of sinking 3.2 mA at VCC > 4.25 V, with guaranteed operation down to VCC = 1 V and 80 μA sink current. The MR input accepts logic-low pulses ≥1 μs and rejects transients <100 ns, with internal 63 kΩ pull-up.

Key Specifications

Pinout & Package

ADM6315-44D4ARTRL7 is housed in a 4-lead SOT-143 package (RA-4), measuring 2.9 mm × 2.4 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 ADM6315-44D4ARTZR7 and MAX6315US44D4+T, the ADM6315-44D4ARTRL7 offers tighter threshold stability over temperature and lower operating current-critical for thermally constrained or battery-dependent applications where reset reliability must not degrade at +125°C.

Availability

ADM6315-44D4ARTRL7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC CPU modules, medical infusion pump controllers, and railway signaling interface boards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM6315-44D4ARTRL7 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control applications.

The ADM6315 family was designed specifically for robust microprocessor supervision in harsh environments-delivering accurate, temperature-stable reset thresholds and factory-programmed timeout periods without external components.

FAQ

What is the exact reset threshold voltage for ADM6315-44D4ARTRL7, and how does it vary with temperature?

The ADM6315-44D4ARTRL7 has a nominal reset threshold of 4.39 V, with tolerance of ±2.5% over −40°C to +85°C and ±3.5% over −40°C to +125°C. This variation is specified in the datasheet's "RESET VOLTAGE THRESHOLD" table and reflects the device's internal bandgap reference drift across temperature. At +125°C, the actual trip point may range from 4.24 V to 4.54 V, ensuring reliable reset assertion even under extreme thermal stress.

Does ADM6315-44D4ARTRL7 require an external pull-up resistor on the RESET pin?

Yes, ADM6315-44D4ARTRL7 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 that the output can sink up to 3.2 mA when VCC > 4.25 V, so the pull-up value must be selected to ensure proper logic-high voltage under worst-case sink current and voltage drop. Typical values range from 4.7 kΩ to 10 kΩ depending on bus capacitance and rise-time requirements.

Can ADM6315-44D4ARTRL7 monitor a 3.3 V supply rail?

No-ADM6315-44D4ARTRL7 is factory-trimmed for a 4.39 V threshold and is not suitable for direct 3.3 V rail supervision. For 3.3 V systems, Analog Devices offers variants such as ADM6315-31D4ARTRL7 (3.08 V) or ADM6315-33D4ARTRL7 (3.30 V). Using ADM6315-44D4ARTRL7 on a 3.3 V rail would result in permanent RESET assertion, as VCC never reaches the 4.39 V trip point.

What is the minimum pulse width required on the MR pin to trigger a reset with ADM6315-44D4ARTRL7?

The MR pin of ADM6315-44D4ARTRL7 requires a low-going pulse of at least 1 μs duration to guarantee recognition. The device debounces inputs and rejects transients shorter than 100 ns (typical), making it immune to contact bounce or EMI. Pulses between 100 ns and 1 μs may or may not trigger reset depending on process and temperature; therefore, system design must ensure ≥1 μs MR assertion for deterministic behavior.

Is ADM6315-44D4ARTRL7 pin-compatible with the ADM811 series?

Yes, ADM6315-44D4ARTRL7 is explicitly stated in the datasheet as pin compatible with the ADM811 series. Both devices use the same 4-lead SOT-143 (RA-4) package with identical pinout: Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC. This allows drop-in replacement in existing ADM811 layouts, provided the 1120 ms timeout and 4.39 V threshold meet the system's supervisory requirements.