Analog Devices Inc. ADM6305D3ARJZ-RL7

Overview

ADM6305D3ARJZ-RL7 from Analog Devices is a dual-input programmable supervisory IC designed to monitor two independent voltage rails and generate an active-low open-drain reset signal for microprocessor systems. It features 1.23 V reset thresholds on both RST IN1 and RST IN2 inputs, 140 ms minimum reset timeout, 5 µA typical supply current, and operates across −40°C to +125°C in portable and multivoltage embedded applications.

For engineers reviewing the ADM6305D3ARJZ-RL7 datasheet, ADM6305D3ARJZ-RL7 pinout, ADM6305D3ARJZ-RL7 application, or ADM6305D3ARJZ-RL7 equivalent, key selection considerations include dual 1.23 V adjustable threshold compatibility, SOT-23 package footprint, guaranteed reset assertion down to VCC = 0.9 V, and absence of VCC monitoring - critical for systems where only external rails require supervision.

Technical Context

The ADM6305D3ARJZ-RL7 implements two independent high-impedance (±25 nA) comparator inputs with fixed 1.23 V thresholds, enabling resistor-divider-based monitoring of voltages >1.23 V. Its reset generator asserts RESET low when either input falls below threshold and holds it for 140–280 ms after recovery.

No internal VCC monitoring is performed; the device remains functional as long as VCC ≥ 0.9 V, and its open-drain output interfaces directly with microprocessor reset pins using a single external pull-up resistor. Glitch immunity is achieved via internal time-based filtering rather than hysteresis on the 1.23 V inputs.

Key Specifications

Pinout & Package

ADM6305D3ARJZ-RL7 is housed in a RoHS-compliant 5-lead SOT-23 (RJ-5) package with JEDEC MO-178-AA compliance, 1.30 mm max height, and 0.95 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with ADM6305D3ARJZ1-RL7, the ADM6305D3ARJZ-RL7 provides higher threshold accuracy for mid-range rails but cannot supervise sub-1 V supplies directly; compared with TPS3808G33DBVR, it delivers true dual-rail independence without external components but lacks VCC monitoring - making it optimal for externally referenced multivoltage systems.

Availability

ADM6305D3ARJZ-RL7 is available at Aetrix Electronics and suitable for microprocessor power sequencing, battery-powered data loggers, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges.

Supply support for ADM6305D3ARJZ-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, headquartered in Norwood, MA, with engineering expertise spanning precision sensing, power management, and reliability-critical IC design.

The ADM6305 family was developed specifically for compact, low-power dual-supply supervision in space-constrained embedded systems where independent rail monitoring and minimal quiescent current are mandatory design requirements.

FAQ

What is the exact reset threshold voltage for each input on the ADM6305D3ARJZ-RL7?

The ADM6305D3ARJZ-RL7 has a precisely trimmed 1.23 V reset threshold on both RST IN1 and RST IN2 inputs, with tolerance of ±1.5% over −40°C to +85°C and ±2.5% over −40°C to +125°C. This value is factory-set and non-adjustable - the "D3" and "Z" suffixes in the part number explicitly denote the 1.23 V dual-threshold configuration per Analog Devices' ordering guide.

Does the ADM6305D3ARJZ-RL7 monitor its own VCC supply?

No, the ADM6305D3ARJZ-RL7 does not monitor VCC. Its VCC pin is a power input only; the device remains functional as long as VCC ≥ 0.9 V, but no reset is generated based on VCC level. Supervision is exclusively performed on the two external RST IN1 and RST IN2 inputs - a key architectural distinction from the ADM6306 series.

What is the guaranteed minimum reset timeout period for ADM6305D3ARJZ-RL7?

The ADM6305D3ARJZ-RL7 provides a factory-programmed reset timeout of 140 ms minimum (200 ms typical, 280 ms maximum) over the full −40°C to +125°C operating range. This timeout begins after both RST IN1 and RST IN2 rise above their 1.23 V thresholds and holds the active-low RESET output asserted for the full duration.

Can ADM6305D3ARJZ-RL7 be used with a 1.8 V supply rail?

Yes, ADM6305D3ARJZ-RL7 can supervise a 1.8 V rail using an external resistor divider on RST IN1 or RST IN2. With its 1.23 V threshold, a 2:1 divider (e.g., 100 kΩ top, 150 kΩ bottom) scales 1.8 V to 1.08 V - insufficient; instead, a 1:1.5 divider yields ~1.2 V input. Precise ratio calculation must ensure VRSTIN ≥ 1.23 V at the rail's minimum valid voltage, accounting for resistor tolerance and temperature drift.

Is the RESET output of ADM6305D3ARJZ-RL7 compatible with 5 V microcontrollers?

Yes, the open-drain RESET output of ADM6305D3ARJZ-RL7 is fully compatible with 5 V microcontrollers. When pulled up to 5 V via an external resistor, it sinks up to 3.2 mA while maintaining VOL ≤ 0.4 V (at VCC > 4.25 V), satisfying standard TTL/CMOS input low-level requirements. The output remains valid as long as VCC ≥ 0.9 V, ensuring robustness during brownout conditions.