Analog Devices Inc./Maxim Integrated ICL7665AEPA

Overview

ICL7665AEPA from Maxim Integrated is a dual over/undervoltage microprocessor supervisor IC with precision internal 1.3V reference, 2% VSET1 threshold accuracy at +25°C, 3µA typical supply current, and operation from 2.0V to 16V supply. It monitors two independent voltage rails-e.g., 5.55V/5.45V overvoltage and 4.55V/4.45V undervoltage-for power-OK signaling in embedded industrial controllers.

For engineers reviewing the ICL7665AEPA datasheet, ICL7665AEPA pinout, ICL7665AEPA application, or ICL7665AEPA equivalent, key selection criteria include its -40°C to +85°C extended temperature grade, externally programmable trip points via resistor dividers, open-drain N-channel OUT1/OUT2 outputs, and P-channel hysteresis outputs (HYST1/HYST2) enabling noise-immune threshold detection without external components.

Technical Context

The ICL7665AEPA integrates a bandgap-based 1.3V reference with two high-impedance comparators, each driving an open-drain N-channel output (OUT1, OUT2) and a complementary open-drain P-channel hysteresis output (HYST1, HYST2). Its low 3µA quiescent current stems from monolithic CMOS design with <10nA input leakage and sub-100ppm/°C VSET tempco.

Each detector's trip point is set by external resistor dividers on SET1/SET2 pins, with hysteresis independently configured using HYST1/HYST2 current sources tied to V+. Propagation delay is 75µs typical, and output saturation voltages are specified down to 0.06V (V+ = 15V, IOUT = 2mA), supporting TTL-level interfacing with pull-ups.

Key Specifications

Pinout & Package

ICL7665AEPA is housed in an 8-pin plastic DIP package (0.300" wide) with through-hole mounting. Pin 1 is OUT1, pin 2 is HYST1, pin 3 is SET1, pin 4 is GND, pin 5 is SET2, pin 6 is HYST2, pin 7 is OUT2, and pin 8 is V+.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR29D3+ and TLV809E33DBZR, the ICL7665AEPA uniquely delivers dual independently programmable thresholds, on-chip hysteresis current sources, and ultra-low 3µA quiescent current-making it irreplaceable for battery-powered multi-rail supervision where accuracy, flexibility, and power efficiency are jointly critical.

Availability

ICL7665AEPA is available at Aetrix Electronics and suitable for industrial PLCs, battery-backed memory modules, portable medical devices, and telecom power management systems requiring stable component supply across extended temperature ranges.

Supply support for ICL7665AEPA 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) designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on low-power, high-reliability solutions.

The ICL7665AEPA belongs to Maxim's microprocessor supervisor product line, engineered specifically for robust voltage monitoring in harsh environments where extended temperature operation, low quiescent current, and dual-rail fault detection are mandatory.

FAQ

What is the guaranteed VSET1 threshold accuracy of the ICL7665AEPA over its full operating temperature range?

The ICL7665AEPA guarantees VSET1 threshold accuracy of ±2.5% over the full -40°C to +85°C temperature range, based on electrical characterization data showing VSET1 = 1.250V to 1.350V at TMIN to TMAX. This specification ensures reliable overvoltage detection without recalibration across industrial thermal cycles, and is tighter than the base ICL7665 grade. The ICL7665AEPA maintains this performance due to trimmed internal reference and comparator offset compensation.

Can the ICL7665AEPA monitor voltages higher than its 16V supply rail?

Yes, the ICL7665AEPA can monitor input voltages up to several hundred volts using external resistor dividers on SET1 and SET2 pins, while operating from a 2.0V–16V V+ supply. The device's input structure tolerates SETx voltages from (GND − 0.3V) to (V+ + 0.3V), so high-voltage monitoring relies entirely on attenuation via external resistors. For example, a 100:1 divider enables monitoring of 100V rails with 1V at SET1. The ICL7665AEPA itself remains powered only by its local V+ rail.

How does the hysteresis function work on the ICL7665AEPA, and what external components are required?

The ICL7665AEPA implements hysteresis using dedicated P-channel current-source outputs (HYST1, HYST2) that inject current into the SET1/SET2 nodes when their respective comparators trip. To configure hysteresis, connect HYST1 to SET1 and HYST2 to SET2 via external resistors (R31, R32); no additional op-amps or comparators are needed. The amount of hysteresis depends on V+, R31/R32 value, and the upper/lower trip voltages. The ICL7665AEPA datasheet provides exact formulas for calculating R31/R32 to achieve target hysteresis widths like 100mV.

What is the maximum sink current capability of the OUT1 and OUT2 pins on the ICL7665AEPA?

The OUT1 and OUT2 pins of the ICL7665AEPA are open-drain N-channel MOSFETs rated for a maximum sink current of 25mA each, with VOL ≤ 0.50V at 2mA and V+ = 2V. At V+ = 15V, saturation voltage drops to 0.06V at 2mA, enabling direct drive of TTL inputs or small LEDs with appropriate series resistors. This capability allows the ICL7665AEPA to interface directly with microcontroller interrupt pins or logic gates without buffer transistors, simplifying circuit design.

Is the ICL7665AEPA RoHS-compliant and lead-free?

Yes, the ICL7665AEPA carries the '+' suffix per Maxim's ordering nomenclature, indicating it is a lead(Pb)-free and RoHS-compliant package. It uses matte tin plating on the 8-pin plastic DIP leads and meets JEDEC J-STD-020 moisture sensitivity level 1 requirements. The RoHS compliance is verified per EU Directive 2011/65/EU and applies to all shipped units of ICL7665AEPA, ensuring environmental safety and global market acceptance.