Analog Devices Inc. ADM13305-5ARZRL7

Overview

ADM13305-5ARZRL7 from Analog Devices is a dual-voltage supervisor IC designed to monitor a fixed 2.5 V supply and an adjustable 0.6 V reference input (via external resistor divider), providing both active-high and active-low reset outputs with 140 ms minimum timeout and 1.6 sec typical watchdog timer. It operates from 2.7 V to 5.5 V supply, draws ≤40 μA, and supports industrial temperature range (−40°C to +85°C) in an 8-lead SOIC_N package. Used in microcontroller-based systems requiring dual-rail power integrity verification.

For engineers reviewing the ADM13305-5ARZRL7 datasheet, ADM13305-5ARZRL7 pinout, ADM13305-5ARZRL7 application, or ADM13305-5ARZRL7 equivalent, key selection considerations include its dual-threshold architecture (fixed 2.25 V SENSE1 + adjustable 0.6 V SENSE2), push-pull RESET/RESET outputs, watchdog timer disable-by-float capability, and guaranteed reset assertion down to VDD ≥ 1.1 V.

Technical Context

The ADM13305-5ARZRL7 implements two independent undervoltage detection paths: SENSE1 monitors a fixed 2.25 V threshold (±3% over −40°C to +85°C), while SENSE2 accepts an externally programmable threshold centered at 0.6 V with zero hysteresis. Its internal oscillator drives both the 140 ms reset timeout and 1.6 sec watchdog timer, which resets on any WDI edge transition and disables when WDI floats.

Reset logic follows a strict priority hierarchy: manual reset (MR) and sensed undervoltage events both assert RESET/RESET simultaneously; the reset remains active for the full timeout period regardless of input recovery. The device uses push-pull output stages capable of sourcing/sinking 2–3 mA, with VOH = VDD − 0.4 V and VOL = 0.4 V under load, ensuring robust interface with 3.3 V and 5.5 V logic families.

Key Specifications

Pinout & Package

ADM13305-5ARZRL7 is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, R-8), 3.9 mm × 4.9 mm footprint, 1.75 mm height, with 1.27 mm lead pitch. RoHS-compliant, Pb-free, and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EPA+ and TPS3808G33DBVR, the ADM13305-5ARZRL7 uniquely delivers dual-rail monitoring with one fixed and one adjustable threshold plus integrated watchdog - enabling consolidated supervision where competing parts require multiple ICs or forfeit critical safety functions.

Availability

ADM13305-5ARZRL7 is available at Aetrix Electronics and suitable for industrial control systems, wireless infrastructure modules, notebook embedded controllers, and medical handheld devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for ADM13305-5ARZRL7 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 precision instrumentation, industrial automation, communications, and healthcare markets.

The ADM13305 family was engineered specifically for dual-rail microprocessor and DSP supervision in space- and power-constrained systems, emphasizing low quiescent current, flexible threshold configuration, and robust reset timing control.

FAQ

What is the exact threshold voltage for SENSE1 on the ADM13305-5ARZRL7?

The ADM13305-5ARZRL7 has a fixed SENSE1 threshold of 2.25 V (typical), with guaranteed range of 2.20 V to 2.32 V across the full −40°C to +85°C temperature range. This value is factory-trimmed and does not require external components - it is optimized for monitoring standard 2.5 V supplies with appropriate hysteresis.

Can the ADM13305-5ARZRL7 monitor a 5 V supply using SENSE2?

Yes, the ADM13305-5ARZRL7 can monitor a 5 V supply using SENSE2 by configuring an external resistor divider that scales 5 V down to 0.6 V at the pin. For example, R1 = 7.33 kΩ and R2 = 1 kΩ yields V_SENSE2 = 5 V × (1 kΩ / (7.33 kΩ + 1 kΩ)) ≈ 0.6 V. The device's 0.6 V reference is stable to ±0.5% over temperature.

Does the ADM13305-5ARZRL7 require external pull-up resistors on RESET and RESET outputs?

No, the ADM13305-5ARZRL7 features true push-pull output drivers on both RESET (active-low) and RESET (active-high) pins. Each output can source up to 3 mA and sink up to 3 mA, eliminating the need for external pull-up or pull-down resistors in standard 3.3 V or 5.5 V logic interfaces.

How does the watchdog timer behave when the WDI pin is left unconnected?

When the WDI pin is left floating (no external connection), the ADM13305-5ARZRL7 watchdog timer is automatically disabled - no reset pulses will be generated due to watchdog timeout. This behavior is intentional and documented in the datasheet; no pull-up or pull-down resistor is required to disable the function.

What is the minimum VDD required for RESET assertion on the ADM13305-5ARZRL7?

The ADM13305-5ARZRL7 guarantees RESET assertion begins when VDD reaches 1.1 V, and RESET remains valid throughout operation down to this level. This ensures reliable power-on reset initiation well before most microprocessors reach their minimum functional VDD, preventing undefined startup states.