Analog Devices Inc./Maxim Integrated ICL7665ACSA+T

Overview

ICL7665ACSA+T from Maxim Integrated is a dual over/undervoltage microprocessor supervisor IC with two independently programmable comparators, a precision 1.3V internal bandgap reference, and open-drain N-channel OUT1/OUT2 plus open-drain P-channel HYS1/HYS2 outputs. It operates from 2.0V to 16V supply, draws only 3µA typical quiescent current, and provides ±2% VSET1 threshold accuracy at +25°C for battery-powered voltage monitoring in portable instrumentation and embedded control systems.

For engineers reviewing the ICL7665ACSA+T datasheet, ICL7665ACSA+T pinout, ICL7665ACSA+T application, or ICL7665ACSA+T equivalent, this page delivers verified functional identity, confirmed SO-8 package mapping, validated 8-pin terminal roles, real-world hysteresis implementation guidance, and two rigorously cross-checked alternative parts for voltage supervisor selection.

Technical Context

The ICL7665ACSA+T integrates a low-power 1.3V bandgap reference with two independent high-impedance comparators-each with externally adjustable trip points via resistor dividers on SET1 and SET2 pins. Its dual open-drain output architecture (N-channel OUT1/OUT2, P-channel HYST1/HYST2) enables flexible wire-OR configurations and TTL-level interfacing with external pull-ups.

Propagation delay is 75µs typical; input bias current is <10nA; VSET temperature coefficient is 100ppm/°C; and hysteresis is implemented by feeding HYSTx outputs back into the divider network-enabling precise upper/lower trip point control without external components beyond resistors.

Key Specifications

Pinout & Package

ICL7665ACSA+T 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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT46D3+T and TLV809EADBZR, the ICL7665ACSA+T uniquely supports dual independently programmable thresholds, integrated hysteresis current sources, and mixed N/P-channel open-drain outputs-making it irreplaceable for multi-rail fault monitoring and adaptive hysteresis designs requiring minimal external components.

Availability

ICL7665ACSA+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC power supervision, and embedded microcontroller reset management requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ICL7665ACSA+T 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+T belongs to Maxim's legacy voltage supervisor product line, designed specifically for low-power, dual-threshold microprocessor monitoring in battery-critical and multi-rail power systems where programmability and hysteresis control are essential.

FAQ

What is the exact function of the HYST1 and HYST2 pins on the ICL7665ACSA+T?

The HYST1 and HYST2 pins on the ICL7665ACSA+T are open-drain P-channel current sources referenced to V+. When the corresponding comparator trips (e.g., VSET1 > 1.3V), HYST1 turns ON and sources current into the SET1 resistor divider, lowering the effective trip threshold on the falling edge-thereby implementing programmable hysteresis. This eliminates need for external hysteresis circuitry and ensures noise immunity near trip points.

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

Yes-the ICL7665ACSA+T can monitor input voltages up to several hundred volts using high-value resistor dividers on SET1 and SET2. The internal comparators operate from the 1.3V reference, so only the divided-down voltage (≤V+) is applied to the pins. For example, a 100:1 divider enables monitoring of 130V inputs while presenting only 1.3V to SET1. Input leakage remains under 10nA, preserving accuracy.

What is the guaranteed operating temperature range for the ICL7665ACSA+T?

The ICL7665ACSA+T is specified for operation from 0°C to +70°C. This is confirmed in the Ordering Information table, where "ICL7665ACSA" maps to the "C" grade (0°C to +70°C) in the 8-pin SO package. The "A" suffix denotes improved 2% VSET1 accuracy at +25°C, but full-range performance-including propagation delay, supply current, and threshold stability-is validated across the entire 0°C to +70°C span.

How does the ICL7665ACSA+T achieve 3µA typical supply current?

The ICL7665ACSA+T achieves 3µA typical supply current through monolithic low-power CMOS design: its 1.3V bandgap reference and dual comparators are optimized for sub-10nA bias currents, and all internal nodes operate at minimal capacitance and switching activity. Measured data shows 2.6µA at V+ = 9V and TA = +25°C, with only 0.3µA increase from 2V to 15V supply-confirming true micropower behavior ideal for battery longevity.

Is the ICL7665ACSA+T pin-compatible with earlier ICL7665 variants like ICL7665CSA?

Yes-the ICL7665ACSA+T shares identical SO-8 pinout, electrical interface, and functional block diagram with ICL7665CSA and ICL7665BCSA. The "A" grade adds tighter VSET1 accuracy (±2% vs. ±12% for "C") and guaranteed tempco performance, but pin functions, timing, and DC characteristics remain fully compatible. No PCB layout changes are required when upgrading from ICL7665CSA to ICL7665ACSA+T.