Analog Devices Inc./Maxim Integrated ICL7665AESA

Overview

ICL7665AESA from Maxim Integrated is a dual over/undervoltage monitor IC for microprocessor supervision, featuring two independently programmable voltage detectors with 2% threshold accuracy at +25°C, 3µA typical quiescent current, and operation from 2.0V to 16V supply. It monitors voltages ≥1.3V using external resistor dividers and delivers open-drain N-channel OUT1/OUT2 and open-drain P-channel HYS1/HYS2 outputs - used in battery-backed memory systems for brownout detection and power-fail warning.

For engineers reviewing the ICL7665AESA datasheet, ICL7665AESA pinout, ICL7665AESA application, or ICL7665AESA equivalent, this device supports precise, low-power voltage supervision in portable and industrial embedded systems where supply stability, temperature drift control (100 ppm/°C), and hysteresis-enabled noise immunity are critical selection criteria.

Technical Context

The ICL7665AESA integrates a precision 1.3V bandgap reference, two high-impedance comparators, and four open-drain outputs - two N-channel sinks (OUT1, OUT2) and two P-channel sources (HYST1, HYST2). Its trip points are set externally via resistor dividers on SET1/SET2 pins, with hysteresis controlled by HYST1/HYST2 feedback paths.

It operates across -40°C to +85°C (industrial grade), maintains 2% VSET1 accuracy over temperature (1.250V–1.350V), and exhibits <10 µA max supply current. Propagation delay is typically 75 µs, and input bias current is <10 nA - enabling use of >1 MΩ divider networks without accuracy loss.

Key Specifications

Pinout & Package

ICL7665AESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27 mm pitch and 5.0 mm × 4.0 mm body size.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBZR and MAX6326UT46D3+, the ICL7665AESA uniquely supports two independently programmable thresholds with on-chip hysteresis sources - enabling compact, accurate dual-supply fault detection without external components or firmware intervention.

Availability

ICL7665AESA is available at Aetrix Electronics and suitable for microprocessor supervision, battery backup switching, and power-fail warning applications requiring stable component supply across industrial temperature ranges and long-lifecycle designs.

Supply support for ICL7665AESA 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The ICL7665AESA belongs to Maxim's precision voltage supervisor product line, engineered for ultra-low-power, high-accuracy supply monitoring in battery-critical and mission-reliability applications - emphasizing threshold stability, minimal quiescent draw, and robust latchup immunity.

FAQ

What is the supply voltage range for the ICL7665AESA?

The ICL7665AESA operates from 2.0V to 16V, with guaranteed performance across its full industrial temperature range (-40°C to +85°C). This range accommodates both low-voltage battery systems (e.g., 3V lithium) and higher-voltage industrial supplies (e.g., 12V or 15V rails), making the ICL7665AESA suitable for diverse embedded power monitoring tasks without external regulators.

How accurate is the voltage threshold of the ICL7665AESA?

The ICL7665AESA guarantees ±2% accuracy on VSET1 at +25°C (1.275V–1.325V) and maintains ±2.5% over -40°C to +85°C (1.250V–1.350V). This precision eliminates the need for external trimming in most applications and ensures reliable trip-point behavior in temperature-varying environments - a key advantage over generic comparators or less-stable supervisors.

Can the ICL7665AESA monitor two different supply voltages simultaneously?

Yes - the ICL7665AESA features two independent comparator inputs (SET1 and SET2), each configurable via external resistor dividers to monitor distinct voltage rails. For example, SET1 can supervise a 5V microprocessor supply while SET2 tracks a 3.3V I/O rail or battery voltage, with separate open-drain outputs (OUT1/OUT2) and hysteresis paths (HYST1/HYST2) for each channel.

What type of outputs does the ICL7665AESA provide?

The ICL7665AESA provides four outputs: two open-drain N-channel outputs (OUT1, OUT2) and two open-drain P-channel outputs (HYST1, HYST2). OUT1 and OUT2 sink current when active (low), ideal for driving TTL inputs or pulling down reset lines. HYST1 and HYST2 source current from V+, enabling direct hysteresis feedback without external transistors - a unique capability not found in most voltage monitors.

Does the ICL7665AESA require external components to function?

Yes - the ICL7665AESA requires external resistor dividers on SET1 and SET2 to scale monitored voltages down to its internal 1.3V reference, plus optional hysteresis resistors connected to HYST1/HYST2. However, no external reference, op-amps, or comparators are needed: the internal 1.3V bandgap, dual comparators, and hysteresis drivers are fully integrated - reducing total solution size and component count significantly compared to discrete alternatives.