---
title: "Real-Time Clock (RTC)"
industry: "Computer, Electronic and Optical Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:REAL_TIME_CLOCK_RTC"
  data_integrity_hash: "ab46f25865c3077899541737b799dc43"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:REAL_TIME_CLOCK_RTC"
  data_source_uri: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/real-time-clock-rtc.md"
  official_resource_url: "https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/real-time-clock-rtc"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "-40°C to +85°C, 1.8V to 5.5V supply voltage, ±20 ppm frequency stability"
    unit: "ppm"
engineering_limits:
  max_safe_operating_point:
    value: 1.62
    unit: "V"
    consequence: "Quartz crystal piezoelectric effect degradation below minimum excitation voltage; silicon lattice damage beyond semiconductor thermal limits"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Electrostatic discharge exceeding 2000V HBM"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated ESD protection diodes with 8kV IEC 61000-4-2 rating"
  - node_2:
      trigger: "32.768 kHz crystal oscillator aging at 3 ppm/year"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Temperature-compensated crystal oscillator with ±2 ppm accuracy over operational range"
bom_nodes:
  quartz-crystal-oscillator:
    type: "part"
    urn: "URN:CNFX:ME:QUARTZ_CRYSTAL_OSCILLATOR"
    interface_type: "physical-logic-coupled"
  cmos-integrated-circuit:
    type: "component"
    urn: "URN:CNFX:ME:CMOS_INTEGRATED_CIRCUIT"
    interface_type: "physical-logic-coupled"
  backup-battery-holder:
    type: "component"
    urn: "URN:CNFX:ME:BACKUP_BATTERY_HOLDER"
    interface_type: "physical-logic-coupled"
  communication-interface-pins:
    type: "component"
    urn: "URN:CNFX:ME:COMMUNICATION_INTERFACE_PINS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "IEC 60747-14-1:2010 - SEMICONDUCTOR DEVICES - PART 14-1: SEMICONDUCTOR SENSORS - GENERIC SPECIFICATION FOR SENSORS"
    scope: "Verified Engineering Specification"
  - standard: "EN 61326-1:2013 - ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/real-time-clock-rtc.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "bf5ceb374a55105c4d8ef0573bf0fca444aa0c90d6d4d7b1fda998d8a6d2adf4"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Real-Time Clock (RTC)

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

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **-40°C to +85°C, 1.8V to 5.5V supply voltage, ±20 ppm frequency stability**. Failure boundary: **Crystal oscillator stops at 1.62V supply voltage, timekeeping fails at -55°C or +125°C junction temperature**, Mechanism: **Quartz crystal piezoelectric effect degradation below minimum excitation voltage; silicon lattice damage beyond semiconductor thermal limits**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Electrostatic discharge exceeding 2000V HBM | 8 | CMOS latch-up causing permanent short circuit | Integrated ESD protection diodes with 8kV IEC 61000-4-2 rating |
| 32.768 kHz crystal oscillator aging at 3 ppm/year | 8 | Cumulative time drift exceeding 5 seconds/month | Temperature-compensated crystal oscillator with ±2 ppm accuracy over operational range |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | ppm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Quartz Crystal Oscillator](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/quartz-crystal-oscillator.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Wafer Prober**, **Die Attach Machine**, **Wire Bonder**  
**Downstream Applications**: Motherboards, Embedded Systems, Automotive ECUs  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the typical accuracy of this RTC module?
**A**: Our RTC modules achieve ±5ppm accuracy using high-quality quartz crystal oscillators, equivalent to approximately 2.5 minutes per year deviation.

### Q: How long does the backup battery last during power outages?
**A**: The integrated lithium battery provides 5-10 years of backup timekeeping depending on environmental conditions and usage patterns.

### Q: What communication interfaces does this RTC support?
**A**: This RTC module supports standard I2C and SPI interfaces for easy integration with microcontrollers and embedded systems in electronic manufacturing applications.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- IEC 60747-14-1:2010 - SEMICONDUCTOR DEVICES - PART 14-1: SEMICONDUCTOR SENSORS - GENERIC SPECIFICATION FOR SENSORS
- EN 61326-1:2013 - ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Real-Time Clock (RTC)](https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/real-time-clock-rtc)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: REAL_TIME_CLOCK_RTC | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 14c68128
