Analog Devices Inc. ADM709LANZ

Overview

ADM709LANZ from Analog Devices is a precision power supply monitor IC with active-low reset output, 4.65 V threshold, 140 ms minimum power-on reset pulse, and operation down to 1 V supply voltage - used for reliable microprocessor reset in industrial embedded systems during power-up, brownout, and power-down events.

For engineers reviewing the ADM709LANZ datasheet, ADM709LANZ pinout, ADM709LANZ application, or ADM709LANZ equivalent, key selection criteria include reset threshold accuracy, guaranteed reset assertion below 1 V, 140 ms timeout stability over –40°C to +85°C, and compatibility with bidirectional µP reset lines requiring series resistance.

Technical Context

The ADM709LANZ integrates a precision voltage comparator and internal timer to generate a clean, glitch-immune active-low RESET signal. It asserts RESET when VCC drops below 4.65 V (±150 mV) and holds it low for ≥140 ms after VCC rises above threshold.

VCC supply range spans 1.0 V to 5.5 V across temperature; RESET remains functional at VCC as low as 1 V, enabling stable shutdown sequencing. The device uses no external components for basic operation but supports optional 0.1 µF VCC bypass and 100 kΩ pull-down for sub-1 V validity.

Key Specifications

Pinout & Package

ADM709LANZ is housed in an 8-pin plastic DIP (N-8) package with 0.3 inch body width and through-hole mounting. Pin 1 is marked by notch or dot; pins 1, 4, 5, 6, and 8 are no-connect (NC), simplifying layout and reducing routing complexity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX709LAN+ and TPS3808G15DBVR, the ADM709LANZ delivers superior low-voltage reset assurance (down to 1 V), lower quiescent current, and zero-component simplicity - making it optimal for cost-sensitive, reliability-critical industrial +5 V systems where proven DIP-mounting and minimal external parts are prioritized.

Availability

ADM709LANZ is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded data loggers, medical diagnostic instruments, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for ADM709LANZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM709 belongs to Analog Devices' precision power monitoring IC family, designed specifically for robust, single-chip reset generation in industrial, medical, and automotive microprocessor systems where supply integrity is mission-critical.

FAQ

What is the exact reset threshold voltage of the ADM709LANZ?

The ADM709LANZ has a nominal reset threshold of 4.65 V, with a guaranteed tolerance of ±150 mV (4.50 V to 4.75 V) over the full –40°C to +85°C temperature range. This value is laser-trimmed at wafer test and specified in the Absolute Maximum Ratings table under "Reset Threshold" for the "L" suffix variant. The ADM709LANZ is intended for +5 V system monitoring where precise trip point stability is essential.

Does the ADM709LANZ support operation below 1 V VCC?

The ADM709LANZ RESET output is guaranteed functional down to VCC = 1.0 V, but not below. When VCC falls below 1 V, RESET may float or become undefined. To ensure RESET remains low during deep undervoltage, a 100 kΩ pull-down resistor from RESET to GND is recommended - as documented in Figure 5 of the ADM709 datasheet. This external component extends deterministic behavior beyond the IC's native specification.

Can the ADM709LANZ drive a microcontroller reset pin directly?

Yes, the ADM709LANZ can drive most µP reset pins directly when the interface is unidirectional. Its RESET output sinks up to 3.2 mA at 0.4 V, meeting standard TTL/CMOS input low-level requirements. However, for microcontrollers with bidirectional reset lines (e.g., MC68HC11), a 4.7 kΩ series resistor is required between ADM709LANZ RESET and the µP pin to prevent signal contention - per Figure 6 in the datasheet.

What is the minimum power-on reset pulse width of the ADM709LANZ?

The ADM709LANZ guarantees a minimum power-on reset pulse width of 140 ms after VCC rises above the 4.65 V threshold. Typical duration is 280 ms, and maximum is 380 ms, all measured under full temperature and voltage range. This fixed timeout is generated by an internal RC timer and requires no external components - ensuring consistent µP initialization timing across units and conditions.

Is the ADM709LANZ pin-compatible with the MAX709 series?

Yes, the ADM709LANZ is a direct pin-compatible and functionally equivalent upgrade for the MAX709LAN in the 8-pin plastic DIP (N-8) package. Both share identical pinout (VCC=2, GND=3, RESET=7), same 4.65 V threshold, 140 ms minimum reset timeout, and industrial temperature range. No PCB changes are required when substituting ADM709LANZ for MAX709LAN in existing designs.