Analog Devices Inc. ADM6326-26ARTZ-R7

Overview

ADM6326-26ARTZ-R7 from Analog Devices is an ultralow-power microprocessor reset circuit in a 3-lead SOT-23 package, providing active-low push-pull reset output with 2.63 V nominal threshold voltage, 100 ms minimum reset timeout, and guaranteed operation down to 1 V supply. It monitors power rails in portable and embedded systems where brownout immunity and sub-1 µA quiescent current are critical.

For engineers reviewing the ADM6326-26ARTZ-R7 datasheet, ADM6326-26ARTZ-R7 pinout, ADM6326-26ARTZ-R7 application, or ADM6326-26ARTZ-R7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), glitch immunity against negative V_CC transients, push-pull output drive capability (1.6 mA sink), and compatibility with low-voltage microcontrollers requiring stable reset assertion during power-up and brownout conditions.

Technical Context

The ADM6326-26ARTZ-R7 integrates a precision voltage reference, comparator with hysteresis (6.3 mV), and internal 100–280 ms reset timeout timer. Its reset generator asserts RESET within 20 µs when V_CC falls below 2.63 V ±2.5%, holding it active for ≥100 ms after V_CC recovers above threshold.

Designed for single-supply monitoring, it operates across −40°C to +85°C with supply current ≤1.0 µA at 3 V and supports V_CC from 1.0 V to 5.5 V. The push-pull output drives low to ≤0.3 V at 1.6 mA, eliminating need for external pull-up resistors unlike open-drain variants.

Key Specifications

Pinout & Package

ADM6326-26ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 270°C/W junction-to-ambient thermal resistance. Pin 1 is GND, Pin 2 is active-low RESET output, and Pin 3 is V_CC input - no external components required for basic operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with ADM6326-26ARTZ-R7, MAX809TRD3-T requires external biasing and offers lower ICC but lacks push-pull drive, while TPS3808G12DBVR provides tighter timeout control and higher V_CC headroom at slightly higher quiescent current - both serve distinct layout and system-level timing requirements.

Availability

ADM6326-26ARTZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart meter communication units requiring stable component supply, RoHS compliance, and long-term production continuity.

Supply support for ADM6326-26ARTZ-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 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 ADM6326 series belongs to Analog Devices' precision voltage supervisor product line, engineered specifically for ultralow-power, single-rail reset monitoring in battery-operated and space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of ADM6326-26ARTZ-R7 and how does it vary with temperature?

The ADM6326-26ARTZ-R7 has a nominal reset threshold of 2.63 V at 25°C, with guaranteed tolerance of ±2.5% over the full −40°C to +85°C operating range. At temperature extremes, the threshold ranges from 2.564 V (min at −40°C) to 2.696 V (max at +85°C), as specified in Table 2 of the Rev. B datasheet. This tight drift ensures consistent brownout detection across environmental conditions without recalibration.

Does ADM6326-26ARTZ-R7 require any external components to function as a reset supervisor?

No, ADM6326-26ARTZ-R7 operates autonomously with only three connections: V_CC, GND, and RESET. Its push-pull output eliminates the need for an external pull-up resistor, unlike open-drain reset ICs. No capacitors, resistors, or timing components are required - the 100–280 ms reset timeout is fully integrated and factory-trimmed.

Can ADM6326-26ARTZ-R7 monitor a 2.63 V supply while powered from a different rail, such as 3.3 V?

No - ADM6326-26ARTZ-R7 monitors only the voltage applied to its V_CC pin (Pin 3). It cannot supervise an independent 2.63 V rail while being powered from another voltage. The device derives both its operating power and reference from the same V_CC input, making it a single-supply supervisor optimized for self-monitoring applications.

What is the minimum V_CC at which ADM6326-26ARTZ-R7 guarantees valid RESET output assertion?

ADM6326-26ARTZ-R7 guarantees functional RESET output down to V_CC = 1.0 V, as stated in the Absolute Maximum Ratings and General Description sections. Below this, the internal comparator and output driver may not operate reliably. This feature enables robust reset hold during deep brownout events common in battery-depleted systems.

How does the glitch immunity of ADM6326-26ARTZ-R7 protect against false resets?

ADM6326-26ARTZ-R7 incorporates built-in immunity to fast negative-going V_CC transients: it ignores pulses shorter than ~100 µs when the overdrive (V_TH − V_CC) is ≤100 mV, per Figure 5 in the datasheet. This prevents spurious resets caused by switching noise, ESD coupling, or transient load dumps - ensuring reset is asserted only during sustained undervoltage conditions.