Analog Devices Inc./Maxim Integrated ICL7665ACSA

Overview

ICL7665ACSA from Maxim Integrated is a dual over/undervoltage microprocessor supervisor IC featuring two independently programmable voltage detectors, 2% threshold accuracy at +25°C for VSET1, 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 HYST1/HYST2 outputs for hysteresis control - deployed in battery-backed memory supervision and power-fail warning circuits.

For engineers reviewing the ICL7665ACSA datasheet, ICL7665ACSA pinout, ICL7665ACSA application, or ICL7665ACSA equivalent, this page delivers verified electrical parameters, confirmed SO-8 package mapping, validated dual-threshold detection behavior, real-world hysteresis implementation guidance, and direct alternative part comparisons for voltage monitoring designs requiring low-power, temperature-stable trip points.

Technical Context

The ICL7665ACSA integrates a precision 1.3V bandgap reference with two high-impedance comparators, enabling externally programmable overvoltage (OUT1) and undervoltage (OUT2) detection via SET1/SET2 resistor networks. Its architecture supports three hysteresis configurations - no hysteresis, hysteresis via dedicated P-channel outputs (HYST1/HYST2), or supply-synchronous hysteresis when VIN = V+.

Each detector operates with ≤10nA input leakage, allowing >1MΩ divider resistors without accuracy loss; propagation delay is 75µs typical. The device guarantees 2% VSET1 threshold accuracy across 0°C to +70°C, with 100ppm/°C tempco and <0.004%/V supply sensitivity - eliminating need for trim pots in most industrial and portable applications.

Key Specifications

Pinout & Package

ICL7665ACSA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and 4.9mm × 3.9mm body dimensions. Pin 1 is marked by a beveled corner or dot; pin numbering follows counterclockwise convention from top-left when viewed from component side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US29D3+ and TPS3808G12DBVR, the ICL7665ACSA uniquely delivers two fully independent, resistor-programmable voltage detectors with integrated hysteresis outputs in a single SO-8 package - making it the only solution among the three capable of true overvoltage + undervoltage pair supervision without external comparators or logic.

Availability

ICL7665ACSA is available at Aetrix Electronics and suitable for battery backup switching, power-fail warning, and microprocessor voltage monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for ICL7665ACSA 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, communications, and computing markets.

The ICL7665ACSA belongs to Maxim's legacy voltage supervisor product line, designed specifically for ultra-low-power, dual-threshold microprocessor monitoring in portable, battery-critical, and industrial control systems where precision and reliability outweigh integration density.

FAQ

What is the guaranteed VSET1 threshold accuracy of the ICL7665ACSA over temperature?

The ICL7665ACSA guarantees ±2.5% VSET1 threshold accuracy across its full operating temperature range of 0°C to +70°C, with ±2% accuracy at +25°C. This specification is validated per Maxim's datasheet Rev 3 (11/15) and includes contributions from reference drift, comparator offset, and tempco - enabling robust brownout detection without calibration in commercial-grade systems.

Can the ICL7665ACSA monitor voltages higher than its V+ supply?

Yes, the ICL7665ACSA can monitor input voltages significantly higher than V+ using external resistor dividers on SET1 and SET2 pins. Its input structure tolerates voltages up to several hundred volts when properly scaled, as confirmed in the General Description and Typical Operating Circuit sections - provided input currents remain within ±0.5mA limits to avoid latchup.

How does hysteresis work on the ICL7665ACSA, and which pins implement it?

Hysteresis on the ICL7665ACSA is implemented via dedicated open-drain P-channel outputs HYST1 and HYST2, which source current from V+ when their respective SET inputs exceed 1.3V. Connecting HYST1 to the SET1 divider network lowers the falling threshold, creating programmable hysteresis - a method explicitly detailed in Figures 4 and 5 of the datasheet and validated in Application Information.

What is the maximum sink current capability of OUT1 and OUT2 on the ICL7665ACSA?

The ICL7665ACSA specifies a maximum sink current of 25mA for both OUT1 and OUT2, measured at V+ = 5V and TA = +25°C. This rating is confirmed in the Absolute Maximum Ratings table and supports direct driving of TTL inputs (with external pull-up) or small LEDs - though typical applications use <2mA loads to maintain low power and ensure VOL ≤ 0.4V.

Is the ICL7665ACSA pin-compatible with earlier ICL7665 versions like ICL7665CSA?

Yes, the ICL7665ACSA is pin-compatible with ICL7665CSA and other members of the ICL7665 family in the same SO-8 package. All share identical pinout, electrical interface, and functional block diagram - differing only in threshold accuracy (2% vs. unspecified), tempco, and guaranteed performance over temperature, as documented in the Ordering Information and Electrical Characteristics tables.