Analog Devices Inc. ADM6348-35ARTZ-R7

Overview

ADM6348-35ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 3.5 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C. It asserts an active-low RESET signal within 20 µs of VCC falling below 3.5 V, holds reset for ≥100 ms on power-up, and remains functional down to VCC = 1 V - enabling reliable startup and brownout protection in portable microprocessor systems.

For engineers reviewing the ADM6348-35ARTZ-R7 datasheet, ADM6348-35ARTZ-R7 pinout, ADM6348-35ARTZ-R7 application, or ADM6348-35ARTZ-R7 equivalent, key selection criteria include its 3.5 V reset threshold, 1 µA max supply current, open-drain output requiring external pull-up, 100 ms minimum timeout, and guaranteed operation at VCC as low as 1 V in extended temperature environments.

Technical Context

The ADM6348-35ARTZ-R7 implements a precision bandgap-based voltage reference and comparator to detect VCC drops below its factory-trimmed 3.5 V threshold (±2.5% over full temperature range). Its internal 100 ms reset timeout timer ensures stable system initialization before release from reset.

As an open-drain device, ADM6348-35ARTZ-R7 requires an external pull-up resistor to interface with bidirectional microprocessor reset inputs, supporting wired-OR configurations and shared reset buses. Glitch immunity rejects negative-going VCC transients up to 200 mV for durations under 1 µs, preventing spurious resets.

Key Specifications

Pinout & Package

ADM6348-35ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 270°C/W junction-to-ambient thermal resistance, optimized for space-constrained PCB layouts and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–T35 and TPS3808G33DBVR, ADM6348-35ARTZ-R7 offers optimal trade-off of 3.5 V specificity, ultralow 1 µA current, open-drain compatibility, and minimal 3-pin SOT-23 footprint - making it ideal for cost- and space-sensitive portable designs requiring precise 3.5 V supervision.

Availability

ADM6348-35ARTZ-R7 is available at Aetrix Electronics and suitable for telecommunications baseband modules, industrial microcontroller gateways, and portable medical diagnostic handhelds requiring stable component supply with RoHS-compliant packaging and full traceability.

Supply support for ADM6348-35ARTZ-R7 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.

The ADM63xx family delivers ultralow-power, precision voltage supervisors targeting battery-operated and thermally constrained embedded systems where reliability during power transients is critical.

FAQ

What is the exact reset threshold voltage of ADM6348-35ARTZ-R7 at 25°C?

The ADM6348-35ARTZ-R7 has a nominal reset threshold of 3.5 V at 25°C, with a guaranteed range of 3.447 V to 3.552 V per Table 2 of the Rev. B datasheet. This 3.5 V specification is factory-trimmed and applies specifically to the ADM6348-35ARTZ-R7 variant, not other members of the ADM6348 family.

Does ADM6348-35ARTZ-R7 require an external pull-up resistor, and why?

Yes, ADM6348-35ARTZ-R7 requires an external pull-up resistor on its open-drain RESET pin because its output cannot actively drive high. A typical 4.7 kΩ to 10 kΩ resistor to the host logic rail (e.g., 3.3 V or 3.5 V) ensures proper logic-high state when reset is inactive, enabling interoperability with bidirectional microprocessor reset inputs as shown in Figure 8 of the datasheet.

What is the minimum VCC voltage at which ADM6348-35ARTZ-R7 continues to assert RESET?

ADM6348-35ARTZ-R7 guarantees valid RESET assertion down to VCC = 1.0 V, as specified in the Absolute Maximum Ratings table and confirmed in the General Description. This allows the device to maintain system reset integrity during deep brownout conditions well below standard logic thresholds, ensuring controlled shutdown before data corruption occurs.

How does the reset timeout behavior of ADM6348-35ARTZ-R7 vary with temperature?

The reset timeout period of ADM6348-35ARTZ-R7 ranges from 100 ms to 280 ms, with a typical value of 185 ms at 25°C. As shown in Figure 6 of the datasheet, the timeout increases slightly with temperature - from ~160 ms at −40°C to ~260 ms at +85°C - ensuring conservative timing margins across the full industrial operating range.

Can ADM6348-35ARTZ-R7 be used to monitor a 3.3 V supply rail?

No, ADM6348-35ARTZ-R7 is specifically trimmed for 3.5 V supervision and is not suitable for monitoring 3.3 V rails. For 3.3 V applications, Analog Devices specifies the ADM6348-33ARTZ-R7 variant (3.3 V threshold), which shares identical package, pinout, and electrical characteristics except for the factory-set threshold voltage.