CMOS Integrated Circuit: Temperature Range -40°C to +85°C

Component Specifications

Definition

A CMOS (Complementary Metal-Oxide-Semiconductor) integrated circuit specifically designed for Real-Time Clock (RTC) functionality, utilizing CMOS technology to achieve extremely low power consumption while maintaining accurate timekeeping through an integrated oscillator and counter system. This component typically includes memory registers for storing time/date data and operates on a backup power source when main power is disconnected.

Working Principle

Utilizes CMOS transistor pairs to create logic gates with minimal static power consumption. An integrated quartz crystal oscillator generates precise timing signals (typically 32.768 kHz) that are divided down by counter circuits to track seconds, minutes, hours, and date. Time data is stored in volatile or non-volatile memory registers accessible through serial communication interfaces.

Materials

Silicon substrate with CMOS transistor structures, aluminum or copper interconnects, silicon dioxide insulation layers, quartz crystal resonator, ceramic or plastic packaging materials.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Memory	32-256 bytes RAM
Interface	I2C, SPI, or 3-wire serial
Time Accuracy	±2ppm to ±20ppm
Backup Current	300nA typical
Operating Voltage	1.8V to 5.5V
Temperature Range	-40°C to +85°C
Oscillator Frequency	32.768 kHz

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 60747, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Real-Time Clock (RTC)

An electronic component that keeps track of the current time and date independently of the main system power.

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Engineering Analysis

Risks & Mitigation

Crystal oscillator failure
Battery leakage
Data corruption during power transitions
ESD damage
Clock drift over temperature variations

FMEA Triads

Trigger: Crystal oscillator contamination or damage
Failure: Loss of timekeeping accuracy or complete clock stoppage
Mitigation: Implement hermetic sealing, use high-quality quartz crystals, add oscillator monitoring circuits

Trigger: Backup battery depletion or leakage
Failure: Loss of time data during power outages
Mitigation: Use lithium batteries with extended lifespan, implement battery monitoring, provide alternative power sources

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Time accuracy within ±5 minutes per year at 25°C

Test Method

JEDEC JESD22-A114 for ESD, MIL-STD-883 for environmental stress, ISO 16750 for automotive applications

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of CMOS Integrated Circuit

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Frequently Asked Questions

What is the main advantage of CMOS technology in RTC circuits?

CMOS technology enables extremely low power consumption, allowing RTC circuits to operate for years on small backup batteries while maintaining accurate timekeeping.

How does the RTC maintain time during power outages?

The RTC switches to a backup power source (typically a coin cell battery or supercapacitor) when main power is lost, preserving time data and continuing oscillator operation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

CMOS Integrated Circuit