Analog Devices Inc. ADM6339HARJZ-RL7

Overview

ADM6339HARJZ-RL7 from Analog Devices is a quad-voltage microprocessor supervisory circuit designed to monitor four independent supply rails-specifically configured for 5.0 V, 3.0 V, 1.8 V, and adjustable 1.23 V thresholds with ±5% tolerance. It delivers active-low open-drain RESET output with 200 ms typical timeout, operates from −40°C to +85°C, and draws only 55 μA quiescent current. It is used in server power sequencing and embedded microprocessor reset management.

For engineers reviewing the ADM6339HARJZ-RL7 datasheet, ADM6339HARJZ-RL7 pinout, ADM6339HARJZ-RL7 application, or ADM6339HARJZ-RL7 equivalent, key selection criteria include factory-set threshold accuracy (±5%), guaranteed RESET validity down to IN1 or IN2 = 1 V, internal 10 μA pull-up on RESET, glitch immunity, and SOT-23-6 packaging for space-constrained designs.

Technical Context

The ADM6339HARJZ-RL7 integrates four independent voltage comparators with pretrimmed thresholds: 5.0 V (−5% tol), 3.0 V (−5% tol), 1.8 V (−5% tol), and adjustable 1.23 V (±0.8% tol). Each input features 0.3% hysteresis relative to its threshold voltage, enhancing noise immunity against short transients.

IN2 serves as both monitored supply and internal power source; RESET remains valid as long as IN1 ≥ 1 V or IN2 ≥ 1 V. The open-drain RESET output includes an internal 10 μA pull-up to IN2 and asserts low when any input crosses its threshold-rising above for negative options, falling below for positive options-followed by a fixed 200 ms timeout before deassertion.

Key Specifications

Pinout & Package

ADM6339HARJZ-RL7 is housed in a JEDEC-compliant 6-lead SOT-23 package (RJ-6), measuring 2.90 mm × 1.60 mm × 1.15 mm, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6339EUT+T and TPS3808G33DBVR, ADM6339HARJZ-RL7 uniquely combines 5.0 V/3.0 V/1.8 V fixed thresholds with a precision 1.23 V adjustable input in one SOT-23-6 device-enabling compact, calibrated supervision of mixed-standard and custom rails without external components.

Availability

ADM6339HARJZ-RL7 is available at Aetrix Electronics and suitable for server power sequencing, industrial microcontroller reset, and telecom line card supervision requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ADM6339HARJZ-RL7 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 ADM6339 family was engineered for space-constrained, multi-rail embedded systems requiring deterministic reset behavior, low power, and factory-calibrated accuracy-targeting telecom infrastructure, enterprise storage, and industrial control applications.

FAQ

What voltage thresholds does the ADM6339HARJZ-RL7 monitor?

The ADM6339HARJZ-RL7 monitors four specific rails: IN1 at 5.0 V (−5% tolerance), IN2 at 3.0 V (−5% tolerance), IN3 at 1.8 V (−5% tolerance), and IN4 as an adjustable 1.23 V input (±0.8% accuracy). These thresholds are factory-trimmed and documented in the Ordering Guide; no configuration pins or registers are required to enable them. The ADM6339HARJZ-RL7 does not support user-programmable thresholds beyond the 1.23 V option.

Does the ADM6339HARJZ-RL7 require an external pull-up resistor on the RESET pin?

No, the ADM6339HARJZ-RL7 includes a 10 μA internal pull-up to IN2 on the open-drain RESET pin, sufficient for interfacing directly with 3.3 V or 5.0 V logic families. An external pull-up is only needed if driving a higher-voltage domain (e.g., 5 V logic while IN2 = 3.3 V), and even then, the internal circuitry prevents reverse current flow. The ADM6339HARJZ-RL7 datasheet confirms RESET remains valid with no external components under standard operating conditions.

How does the ADM6339HARJZ-RL7 handle brown-out conditions during power-down?

The ADM6339HARJZ-RL7 guarantees RESET output validity as long as IN1 ≥ 1 V or IN2 ≥ 1 V-enabling clean assertion of RESET during controlled power-down. When either supply drops below 1 V, RESET enters an undefined state, but the 200 ms timeout ensures the system remains held in reset until all monitored voltages fall definitively below their thresholds. This behavior is explicitly specified in Table 1 and General Description of the ADM6339HARJZ-RL7 datasheet.

Can unused inputs on the ADM6339HARJZ-RL7 be left floating?

No, unused inputs on the ADM6339HARJZ-RL7 must not float or be grounded. For positive-threshold inputs (e.g., IN3 or IN4 when configured for 1.23 V), connect directly to IN2. For negative-threshold variants (not applicable to ADM6339HARJZ-RL7), tie to a more negative supply. Floating inputs risk false resets due to leakage or noise; the ADM6339HARJZ-RL7 datasheet mandates proper termination in Pin Configuration and Theory of Operation sections.

What is the temperature coefficient of the voltage thresholds in the ADM6339HARJZ-RL7?

The ADM6339HARJZ-RL7 has a voltage threshold temperature coefficient (TCVTH) of 60 ppm/°C across the −40°C to +85°C range, as specified in Table 1 of the datasheet. This applies uniformly to all fixed and adjustable thresholds. Performance curves (e.g., Figure 5 and Figure 10) confirm <±0.02% drift over full temperature range for 1.8 V and 0.62 V options-consistent with the 60 ppm/°C spec. The ADM6339HARJZ-RL7 maintains this stability without external compensation.