Analog Devices Inc. ADM709MANZ

Overview

ADM709MANZ from Analog Devices is a precision power supply monitor IC with active-low reset output, 4.40 V threshold, 140 ms minimum power-on reset timeout, and operation down to 1 V supply voltage; used for reliable microprocessor reset in industrial embedded systems requiring stable brownout detection.

For engineers reviewing the ADM709MANZ datasheet, ADM709MANZ pinout, ADM709MANZ application, or ADM709MANZ equivalent, key selection criteria include reset threshold accuracy (±0.15 V), guaranteed RESET assertion at VCC ≥ 1 V, 35 µA quiescent current at low VCC, and compatibility with +5 V/+3.3 V supply rails in N-8 DIP packaging.

Technical Context

The ADM709MANZ implements a bandgap-based voltage comparator with internal timing circuitry to generate a minimum 140 ms active-low reset pulse after VCC rises above 4.40 V. It asserts RESET during power-up, brownout (VCC < 4.25 V), and power-down (VCC down to 1 V).

Its RESET output is open-drain compatible, sinks up to 3.2 mA at VCC ≥ threshold, and features glitch immunity against short VCC transients-no external capacitor required but recommended for enhanced noise rejection near the VCC pin.

Key Specifications

Pinout & Package

ADM709MANZ is housed in an 8-pin plastic DIP (N-8) package with 0.3" width, 0.1" pin pitch, and standard through-hole footprint. Pins 1, 4, 5, 6, and 8 are no-connect; functional terminals are VCC (Pin 2), GND (Pin 3), and active-low RESET (Pin 7).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply monitor applications.

Compared with MAX709MCPA+, ADM709MANZ offers lower quiescent current and broader VCC range (down to 1 V); compared with TPS3808G33DBVR, it provides exact 4.40 V threshold and through-hole N-8 compatibility but consumes more current and lacks programmable delay.

Availability

ADM709MANZ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive body control modules, and telecom remote terminal units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM709MANZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM709 belongs to Analog Devices' power supply supervisor product line, designed specifically for deterministic microprocessor reset generation in industrial, automotive, and medical systems where reliability under voltage fault conditions is critical.

FAQ

What is the exact reset threshold voltage of the ADM709MANZ?

The ADM709MANZ has a nominal reset threshold of 4.40 V, with a guaranteed range of 4.25 V to 4.50 V over the full –40°C to +85°C temperature range. This value is laser-trimmed at wafer test and specified in the device's ordering guide and electrical characteristics table. The "M" suffix explicitly denotes the 4.40 V variant, distinguishing it from other ADM709 versions like L (4.65 V) or T (3.08 V). ADM709MANZ maintains this threshold stability without external components.

Does the ADM709MANZ require an external capacitor for reset timing?

No, the ADM709MANZ does not require an external capacitor for its 140 ms power-on reset timeout-the timing is fully internal and factory-trimmed. An external 0.1 µF capacitor is optional and recommended only for enhanced VCC line noise immunity, placed as close as possible to the VCC pin. The device's glitch immunity design ensures reliable operation without mandatory external timing components, simplifying board layout and reducing BOM count for ADM709MANZ implementations.

Can the ADM709MANZ operate with supply voltages below 3.3 V?

Yes, the ADM709MANZ operates with VCC as low as 1.0 V while maintaining valid RESET output assertion-guaranteed per datasheet specifications. Its internal circuitry remains functional down to this level, allowing it to hold a microprocessor in reset during deep brownout or battery depletion. However, the 4.40 V threshold means it will assert RESET whenever VCC falls below ~4.25 V; operation below 3.3 V occurs only during fault conditions, not normal regulation. ADM709MANZ is not intended as a low-voltage supervisor but excels at fail-safe shutdown integrity.

Is the ADM709MANZ pin-compatible with the MAX709 series?

Yes, the ADM709MANZ is pin-compatible with the MAX709M in the same N-8 DIP package-identical pin 1 orientation, VCC (Pin 2), GND (Pin 3), and RESET (Pin 7) assignments, with the same no-connect pins (1, 4, 5, 6, 8). This allows direct replacement in legacy MAX709M designs without PCB modification. ADM709MANZ improves upon MAX709M with lower quiescent current (35 µA vs. 50 µA typ) and extended VCC operational range down to 1 V, making it a functional upgrade for ADM709MANZ drop-in use cases.

What is the maximum sink current capability of the ADM709MANZ RESET output?

At VCC ≥ reset threshold, the ADM709MANZ RESET output can sink up to 3.2 mA while maintaining VOL ≤ 0.4 V, as specified for ADM709L/M variants. This is sufficient to directly drive standard TTL and CMOS microprocessor reset inputs without external buffering. The output is open-drain, requiring an external pull-up resistor to the target logic rail (typically +5 V or +3.3 V). For loads exceeding 3.2 mA or for bidirectional µP interfaces (e.g., MC68HC11), a series resistor (e.g., 4.7 kΩ) is recommended to prevent contention-details are documented in the ADM709MANZ application circuit guidance.