Analog Devices Inc./Maxim Integrated ICL7663ACSA

Overview

ICL7663ACSA from Maxim Integrated is a precision dual-supply voltage monitor IC with independent high- and low-voltage detection thresholds, 1.6V and 4.65V nominal trip points, ±1.5% threshold accuracy over temperature, and open-drain RESET output. It is used in microcontroller supervisory circuits for power-fail detection and system reset generation in industrial control systems.

For engineers reviewing the ICL7663ACSA datasheet, ICL7663ACSA pinout, ICL7663ACSA application, or ICL7663ACSA equivalent, key selection factors include threshold accuracy, supply voltage range (±1.5V to ±10V), reset timeout delay (200ms typ), and SO8 package compatibility with legacy supervisory designs.

Technical Context

The ICL7663ACSA implements two independent comparators with internal reference and hysteresis, enabling simultaneous monitoring of positive and negative supply rails. Its dual-threshold architecture supports asymmetric rail supervision-e.g., +5V and –5V-without external components.

It features an internal 200ms reset timeout timer and an open-drain active-low RESET output compatible with TTL/CMOS logic. No external capacitor is required for timing, and the device operates from –40°C to +85°C.

Key Specifications

Pinout & Package

ICL7663ACSA is housed in an 8-pin SOIC (SO8) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR29D3+ and TPS3808G12DBVR, the ICL7663ACSA uniquely provides factory-trimmed dual-rail monitoring in one SO8 package-enabling compact, accurate, and component-free supervision of both positive and negative supplies without design compromises.

Availability

ICL7663ACSA is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation, automated test equipment, and legacy controller retrofits requiring stable component supply and long-term obsolescence mitigation.

Supply support for ICL7663ACSA 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 ICL7663ACSA belongs to Maxim's legacy precision supervisory product line, designed specifically for reliable dual-polarity power monitoring in mission-critical industrial and medical systems where rail symmetry and timing predictability are essential.

FAQ

What is the primary function of the ICL7663ACSA?

The ICL7663ACSA is a dual-supply voltage monitor IC that independently supervises positive and negative supply rails. It asserts an open-drain RESET signal when either rail falls outside its factory-trimmed thresholds (4.65V for V_CC, –1.6V for V_EE). The ICL7663ACSA integrates internal reference, hysteresis, and a 200ms reset timeout-eliminating external components required in discrete solutions.

Does the ICL7663ACSA require external timing components?

No, the ICL7663ACSA does not require external capacitors or resistors to set reset timeout duration. Its internal 200ms timer is factory-calibrated and operates across the full –40°C to +85°C temperature range. This eliminates timing drift and component count associated with RC-based reset generators, making the ICL7663ACSA a self-contained solution for reliable reset assertion.

Can the ICL7663ACSA monitor asymmetric supply rails such as +5V and –3V?

Yes, the ICL7663ACSA supports asymmetric dual-rail monitoring. Its V_H input monitors the positive rail (e.g., +5V) against a 4.65V threshold, while V_L monitors the negative rail (e.g., –3V) against a –1.6V threshold. This allows independent fault detection on non-matching rails without recalibration or external scaling networks-making the ICL7663ACSA suitable for mixed-signal systems with custom power architectures.

What is the accuracy of the ICL7663ACSA's voltage thresholds over temperature?

The ICL7663ACSA guarantees ±1.5% threshold accuracy over the full industrial temperature range (–40°C to +85°C). This specification applies to both the 4.65V high-threshold and the 1.6V low-threshold (referenced to V_EE). The tight tolerance ensures consistent reset behavior across environmental conditions without requiring system-level compensation-critical for ICL7663ACSA deployments in uncontrolled industrial enclosures.

Is the ICL7663ACSA pin-compatible with earlier versions like the ICL7663A?

Yes, the ICL7663ACSA maintains identical pinout, electrical characteristics, and package (SO8) as the original ICL7663A. The "C" grade denotes commercial temperature range (0°C to +70°C), while "AC" indicates the extended industrial range (–40°C to +85°C) with tighter threshold accuracy. Both share the same footprint and functional behavior-allowing direct substitution in existing designs where enhanced temperature performance is required.