Analog Devices Inc./Maxim Integrated ICL7665ACPA

Overview

The ICL7665ACPA from Maxim Integrated is a dual over/undervoltage monitoring IC for microprocessor systems, 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 delivers open-drain N-channel OUT1/OUT2 and open-drain P-channel HYS1/HYS2 outputs for battery-powered power-fail detection and brownout warning in embedded controllers.

For engineers reviewing the ICL7665ACPA datasheet, ICL7665ACPA pinout, ICL7665ACPA application, or ICL7665ACPA equivalent, this device supports precise low-power voltage supervision with externally set trip points above 1.3V, on-board hysteresis control, and compatibility with TTL-level interfacing via external pull-ups - critical for reliable reset generation and backup switching in portable and industrial systems.

Technical Context

The ICL7665ACPA integrates a precision 1.3V bandgap reference, two high-impedance comparators, and four open-drain outputs (two N-channel sinks, two P-channel sources) in a monolithic CMOS process. Its VSET1/VSET2 inputs accept externally divided voltages, with comparator trip points defined by the 1.3V internal reference and resistor networks.

Each detector provides independent hysteresis via HYST1/HYST2 current-source outputs tied to V+, enabling stable threshold behavior against noise. Propagation delay is typically 75µs, and input bias current is below 10nA - allowing use of high-value resistors (up to 10MΩ) without accuracy degradation.

Key Specifications

Pinout & Package

ICL7665ACPA is housed in an 8-pin plastic DIP package (0.300" width), with through-hole mounting and RoHS-compliant lead finish. Pin spacing follows JEDEC MS-001 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBZR and MAX6326UT46D3+, the ICL7665ACPA uniquely supports two independently programmable voltage thresholds with integrated hysteresis control - enabling compact, flexible supervision of multiple rails or sequential events (e.g., warning then shutdown) without additional components.

Availability

ICL7665ACPA is available at Aetrix Electronics and suitable for microprocessor voltage monitoring, battery backup switchover, and AC line brownout detection requiring stable component supply across industrial, medical, and portable electronics programs.

Supply support for ICL7665ACPA 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 power management, sensing, and interface applications in industrial, automotive, and communications systems.

The ICL7665ACPA belongs to Maxim's voltage supervisor product line, engineered specifically for low-power, dual-threshold monitoring in battery-critical and fault-tolerant embedded systems - emphasizing accuracy, flexibility, and minimal quiescent consumption.

FAQ

What is the guaranteed VSET1 threshold accuracy of the ICL7665ACPA over its full operating temperature range?

The ICL7665ACPA guarantees VSET1 threshold accuracy of ±2.5% over the full 0°C to +70°C operating temperature range, based on electrical characterization data showing VSET1 = 1.250V to 1.350V at TMIN to TMAX. This specification applies specifically to the ICL7665ACPA grade and reflects worst-case deviation including comparator offset drift and reference tempco. The 2% figure cited in general descriptions refers only to +25°C performance.

Can the ICL7665ACPA monitor voltages higher than its V+ supply rail?

Yes, the ICL7665ACPA can monitor input voltages significantly higher than its V+ supply rail using external resistor dividers on SET1 and SET2 pins. The device's input structure allows VSET inputs up to (V+ + 0.3V), but external dividers enable safe monitoring of voltages up to several hundred volts - as confirmed in the General Description and Typical Operating Circuit sections. Input current remains below 10nA, preserving accuracy even with high-impedance networks.

How does the hysteresis function work on the ICL7665ACPA, and what is required to implement it?

The ICL7665ACPA implements hysteresis using dedicated HYST1 and HYST2 P-channel current-source outputs referenced to V+. To activate hysteresis, connect each HYST pin to its corresponding SET pin via a resistor (R31/R32). When the comparator trips, the HYST output sources current into the SET divider, shifting the effective trip point - creating distinct upper and lower thresholds. The magnitude of hysteresis depends on R31/R32 value and V+, per formulas in the Applications Information section.

Is the ICL7665ACPA pin-compatible with earlier ICL7665 variants like the ICL7665CPA?

Yes, the ICL7665ACPA is pin-compatible with ICL7665CPA and ICL7665BCPA in the same 8-pin plastic DIP package. All share identical pinout, electrical interface, and functional block diagram. The 'A' suffix denotes improved VSET1 threshold accuracy (2% vs. unspecified for 'C' grade) and guaranteed temperature performance - no PCB layout changes are required when upgrading from ICL7665CPA to ICL7665ACPA.

What is the maximum sink current capability of the OUT1 and OUT2 outputs on the ICL7665ACPA?

The OUT1 and OUT2 outputs of the ICL7665ACPA are rated for a maximum sink current of 25mA each, as specified in the Absolute Maximum Ratings table. This is verified across all supply voltages from 2V to 15V and supports direct driving of TTL inputs, LEDs (with series resistor), or gate control of small-signal MOSFETs - provided the output saturation voltage (e.g., 0.20V at 2mA, V+ = 2V) remains within system logic thresholds.