Editorial Technical Reference

Real-Time Clock Module

This page explains how Real-Time Clock Module is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A hardware component that provides precise timekeeping functionality for synchronization systems.

View Full Specifications Explore Manufacturing Sources
Real-Time Clock Module in a manufacturing environment
Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Real-Time Clock Module

Definition
The Real-Time Clock Module is a dedicated electronic component used within an Industrial Synchronization Controller to maintain accurate real-time tracking. It serves as the time reference source for synchronization operations, enabling coordinated timing across industrial processes and equipment. The module is designed for integration into systems where precise timekeeping is critical for operational consistency. It operates using a quartz crystal oscillator to generate stable clock signals, and it includes battery-backed memory to preserve timekeeping during power interruptions. The module continuously counts seconds, minutes, hours, and dates while providing synchronization pulses to the controller. Key parameters include a supply voltage range of 1.8–5.5 V DC for the I2C interface, a timekeeping current of 0.3–1.0 µA (typical 0.5 µA at 3.0 V), and an accuracy of ±2 ppm at 25 °C. The I2C bus frequency supports standard and fast modes up to 400 kHz. The module is rated for industrial-grade operating temperatures from -40 to 85 °C, with a storage temperature range of -55 to 125 °C. It operates in non-condensing humidity from 5% to 95% RH. ESD tolerance is ±2 kV per the HBM model, referenced to IEC 61000-4-2. Package sizes range from SOP-8 to TSSOP-8, with dimensions from 3.0 to 8.0 mm, and weight varies from 0.1 to 0.5 g depending on package type. The module is constructed with a quartz crystal, integrated circuit, and lithium battery. These specifications are directory reference ranges; for a specific application, verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The Real-Time Clock Module uses a quartz crystal oscillator to generate a stable clock signal. The oscillator's frequency is divided to count seconds, minutes, hours, and dates. A lithium battery provides backup power to maintain timekeeping when the main supply is interrupted. The module outputs synchronization pulses to the controller, ensuring coordinated timing. The I2C interface allows the controller to read and set the time. The module's accuracy is maintained by the crystal's frequency stability, typically ±2 ppm at 25 °C. The battery-backed memory ensures that time data is retained during power loss.
Common Materials
Quartz crystal, Integrated circuit, Lithium battery
Technical Parameters
ParameterTypical rangeNotes & selection driver
Supply Voltage1.8–5.5 V DCOperating range for I2C interface
Timekeeping Current0.3–1.0 µAAt 3.0 V, typical 0.5 µA
Accuracy±2 ppmAt 25 °C, typical ±2 ppm
I2C Bus Frequency0–400 kHzStandard and fast mode
Operating Temperature-40–85 °CIndustrial grade
Storage Temperature-55–125 °CNon-operating
Humidity5–95 % RHNon-condensing
ESD Tolerance±2 kVHBM modelIEC 61000-4-2
Package Size3.0–8.0 mmSOP-8 to TSSOP-8
Weight0.1–0.5 gDepends on package type

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

Components / BOM

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (electronic component, no pressure rating)
other spec: Supply voltage: 1.8V to 5.5V, Timekeeping accuracy: ±2ppm to ±20ppm depending on crystal, Backup current: 0.25μA to 1μA
temperature: -40°C to +85°C (industrial grade), -20°C to +70°C (commercial grade)
Media Compatibility
✓ Embedded systems with battery backup ✓ Industrial automation controllers ✓ Telecommunications timing equipment
Unsuitable: High-vibration environments without proper shock mounting
Sizing Data Required
  • Required timekeeping accuracy (ppm)
  • Backup power source specifications (battery type/capacity)
  • Communication interface requirements (I2C, SPI, parallel)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Battery Depletion
Cause: Primary cell exhaustion due to continuous operation beyond rated lifespan, accelerated by high temperature environments or manufacturing defects.
Crystal Oscillator Drift
Cause: Frequency deviation from aging, mechanical stress, or temperature coefficient effects, leading to timing inaccuracies.
Maintenance Indicators
  • System logs showing time resets or 'CMOS checksum error' messages during boot
  • Inconsistent timestamping in data logs or network synchronization failures
Engineering Tips
  • Implement periodic battery voltage monitoring with predictive replacement scheduling before critical thresholds
  • Use temperature-compensated crystal oscillators (TCXO) and ensure proper mechanical mounting to minimize thermal/mechanical stress

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60747-8:2010 Semiconductor devices - Discrete devices - Part 8: Field-effect transistors CE marking for EMC Directive 2014/30/EU

Quoted from the published standard.

Manufacturing Precision
  • Timekeeping accuracy: +/- 2 minutes per month at 25°C
  • Operating temperature range: -40°C to +85°C
Quality Inspection
  • Frequency stability test using precision frequency counter
  • Environmental stress screening (temperature cycling and vibration)
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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Real-Time Clock Module

Manufacturer profiles associated with Real-Time Clock Module.

Sourcing Real-Time Clock Module from China?
Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.
Request manufacturers We manufacture this

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Buyer enquiry

Request manufacturing insight for Real-Time Clock Module

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What to include
Share your product specifications, quantity, destination and target delivery date.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at [email protected].

Frequently Asked Questions

What is the supply voltage range for the I2C interface?

The supply voltage range for the I2C interface is 1.8–5.5 V DC. This is a reference range; verify the exact requirement for your specific module model.

How does the module maintain time during power interruptions?

The module uses a lithium battery to power the timekeeping circuitry when the main supply is off. This ensures that the clock continues to count and retains time data.

What is the accuracy of the real-time clock?

The accuracy is typically ±2 ppm at 25 °C. This means the clock may drift by up to 2 seconds per million seconds (about 1 minute per year). Actual accuracy depends on operating conditions.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, industrial grade. The storage temperature range is -55 to 125 °C. Ensure your application environment is within these limits.

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

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Synchronization Controller
View system integration details

Industrial Ecosystem & Supply Chain Structure

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Real-Time Clock Module.

RTC Module Timekeeping Module

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

Need to Manufacture Real-Time Clock Module?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
XY Positioning Stage
Last Product
Get QuotesChat