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CPC7508: LCAS IC for Ringing SLICs  
CPC7508 Picture CPC7508 Apps Diagram  
Typical CPC7508 Application with SLIC  


  • Fiber to the Home (FTTH)
  • Fiber in the Loop (FITL)
  • VoIP Gateways
  • PBX Systems
  • Digitally Added Main Line (DAML)
  • Hybrid Fiber Coax (HFC)


  • TTL Logic-Level Inputs for 3.3V Logic Interfaces
  • Smart Logic for Power-Up and Hot-Plug State Control
  • Monolithic IC Reliability
  • Low, Matched R_on
  • Clean, Bounce-Free Switching
  • Integrated Current Limiting and Thermal Shutdown for SLIC Protection
  • +12V Operation With Power Consumption <25mW
  • Latched Logic-Level Inputs, No External Drive Circuitry Required
  • Small 16-Pin SOIC Package

CPC7508 Data Sheet (Rev 5)

The CPC7508 is a member of our next generation Line Card Access Switch family. This versatile monolithic high voltage IC features eight digitally controlled MOSFET switching relays for bidirectional transmission, particularly for ringing SLIC (RSLIC) telephony applications. When used with ringing SLICs, it provides the necessary functions to replace the two 2-Form-C electromechanical test relays used in contemporary Fiber To The Home (FTTH) and Optical Network Unit (ONU) deployments, as well as Voice over IP (VoIP) telephony terminals.

Solid state switches provide the mechanism for tip and ring line break, drop test, and channel test, while requiring only a single +12V supply for operation. Interface compatibility with 3.3V or 5V logic for switch state control is provided by the TTL logic level inputs. In addition, surge protection costs for the ringing SLIC (RSLIC) are greatly reduced due to the integrated current limit and thermal shutdown protection in each high-voltage switch on the CPC7508.

The CPC7508 is designed for fiber access units where EMR’s are used for test access and line monitoring functions, but solid-state switches are desired due to reduced operating noise, lower power consumption, and longer lifetimes. The CPC7508 also provides additional switches and integrates more functionality than restricted test capability RSLICs having a limited number of internal switches.

This monolithic, 8-pole, solid-state switch is available in a 16-pin SOIC package.


Click here for Reliability Report for this device


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