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CPC75282: Dual Line Card Access Switch (LCAS)

Not recommended for new designs (PCN1050)

CPC75282 Image and PCN Link CPC75282 Block Diagram  
CPC75282 Block Diagram  


  • VoIP Gateways
  • Central Office (CO)
  • Digital Loop Carrier (DLC)
  • PBX Systems
  • Digitally Added Main Line (DAML)
  • Hybrid Fiber Coax (HFC)
  • Fiber In The Loop (FITL)
  • Pair Gain System
  • Channel Banks


  • Improved Switch dV/dt Immunity of 1500V/µs
  • Smart Logic for Power-Up/Hot-Plug State Control
  • Small 44-Pin TQFP Package
  • Low, Matched R_on
  • Monolithic IC Reliability
  • Eliminates the Need for Zero-Cross Switching
  • Flexible Switch Timing to Transition from Ringing Mode to Talk Mode
  • Clean, Bounce-Free Switching
  • Tertiary Protection Consisting of Integrated Current Limiting,
    Voltage Clamping, and Thermal Shutdown for SLIC Protection
  • 5V Operation with Very Low Power Consumption
  • Intelligent Battery Monitor
  • Latched Logic-Level Inputs, no External Drive Circuitry Required

CPC75282 Data Sheet (Rev E)

CPC75282 is our 1st Dual 6-pole LCAS IC; it has the highest dV/dt rating (1500V/µsec minimum) for all on-chip bidirectional switching power devices. This best-in-class dV/dt robustness rating makes the CPC75282 dual LCAS device the most reliable solution for the public switch telephone network (PSTN), which is commonly subjected to lightning or surge events. This rugged high voltage integrated circuit technology can also be used in communication over powerline, monitoring and remote metering applications.

The dV/dt enhancement for the CPC75282 device is made using our silicon-on-insulator (SOI), 330V BCDMOS process with trench isolation, which has been used for many years in central office (CO) telecom equipment requiring long operational life (20+ years). The integrated LCAS IC in TQFP packaging provides the electrical switching functionality of four mechanical 2-Form-C relays, enabling higher density line card designs, and provides a drop-in upgrade and second-source replacement of the Le75282.

The LCAS IC features digitally-controlled high-voltage switches used between a Subscriber Line Interface Chip (SLIC) and the PSTN tip/ring line. The CPC75282 provides make/break switch functions for battery feed, ringing, line test-out and ringing test. It also has integrated current-limiting and thermal shutdown, which work in conjunction with a voltage clamp, providing superior protection for the SLIC. In addition, the LCAS IC requires only a +5V supply for operation.

The dual 6-pole CPC75282 is fully specified over the -40 to +85°C industrial temperature range, and is available in an industry standard 44-lead TQFP package.

Click here for a Reliability Report for this device
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