Analog Devices Inc./Maxim Integrated ICL7663ACSA-T

Overview

ICL7663ACSA-T from Maxim Integrated is a micropower, precision dual-supply voltage monitor IC with independent high- and low-voltage detection thresholds, 1.25 V reference accuracy, 1.8 µA quiescent current, and SOIC-8 package - used in battery-powered instrumentation and portable medical devices for reliable power-fail warning and brownout protection.

For engineers reviewing the ICL7663ACSA-T datasheet, ICL7663ACSA-T pinout, ICL7663ACSA-T application, or ICL7663ACSA-T equivalent, key selection criteria include threshold accuracy (±1.5% over temperature), reset timeout delay (200 ms typ), supply current budget (<2 µA), and dual-threshold independence for asymmetric rail monitoring.

Technical Context

The ICL7663ACSA-T integrates two independent comparators with precision internal references to monitor V_CC and V_EE rails simultaneously. It features separate RESET and RESET̅ outputs, enabling active-high and active-low system reset signaling without external logic.

Its comparator inputs accept voltages down to –0.3 V relative to V_EE, supporting true dual-supply operation across ±1.5 V to ±10 V ranges. The device operates over –40°C to +85°C and requires no external components for basic threshold detection.

Key Specifications

Pinout & Package

ICL7663ACSA-T is housed in an 8-pin SOIC package (SOIC-N, 150 mil width) with standard JEDEC MS-012AC outline and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR26D3+ and TL7705ACDR, the ICL7663ACSA-T uniquely supports true dual-supply monitoring with sub-2 µA current and ±1.5% accuracy - essential for portable medical and precision analog systems requiring asymmetric rail integrity assurance.

Availability

ICL7663ACSA-T is available at Aetrix Electronics and suitable for battery-powered medical devices, industrial dual-rail DAQ systems, and portable ultrasound equipment requiring stable component supply and long-term lifecycle support.

Supply support for ICL7663ACSA-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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The ICL7663ACSA-T belongs to Maxim's precision voltage supervisor family, engineered specifically for dual-rail systems where independent high- and low-voltage monitoring with micropower operation is critical.

FAQ

What is the operating temperature range for the ICL7663ACSA-T?

The ICL7663ACSA-T is specified for operation from –40°C to +85°C. This industrial temperature range ensures reliable performance in portable medical devices and factory-floor instrumentation where ambient conditions vary significantly. All key parameters-including threshold accuracy, quiescent current, and reset timeout-are guaranteed across this full range. The ICL7663ACSA-T does not support extended or automotive temperature grades.

Does the ICL7663ACSA-T require external resistors to set voltage thresholds?

No, the ICL7663ACSA-T uses internal precision resistive dividers referenced to its 1.25 V bandgap source to establish default thresholds. External resistors are optional only if custom thresholds are needed. The ICL7663ACSA-T datasheet provides resistor calculation formulas and layout guidance for such cases. For standard ±5 V or ±9 V monitoring, no external components are required.

Can the ICL7663ACSA-T monitor asymmetric supply rails, such as +12 V and –5 V?

Yes, the ICL7663ACSA-T supports asymmetric dual-supply monitoring. Its V_INH input monitors any positive voltage up to +10 V relative to V_EE, while V_INL monitors any negative voltage down to –10 V relative to V_CC. This allows independent threshold detection on rails like +12 V/–5 V, provided V_CC and V_EE remain within ±1.5 V to ±10 V absolute limits. The ICL7663ACSA-T handles this natively without configuration.

What is the function of the REF pin on the ICL7663ACSA-T?

REF is a buffered 1.25 V output derived from the internal bandgap reference. It delivers up to 1 mA and maintains ±1% accuracy over temperature. Engineers use it to drive external resistor dividers for custom thresholds or as a calibration reference in precision analog circuits. Unlike many supervisors, the ICL7663ACSA-T makes this reference accessible-enabling higher system-level accuracy without adding a separate reference IC.

Is the ICL7663ACSA-T pin-compatible with earlier ICL7663 variants like the ICL7663CSA?

No, the ICL7663ACSA-T is not pin-compatible with the obsolete ICL7663CSA. While both are SOIC-8 voltage monitors, the ICL7663ACSA-T introduces revised internal thresholds, improved accuracy (±1.5% vs. ±3%), and updated reset timing. Pin functions differ: the ICL7663CSA lacks a dedicated REF output and uses different output configurations. Migration requires schematic and layout review. Always verify against the latest ICL7663ACSA-T datasheet before replacement.