Clare's new 3rd Generation CPC769x Series Line Card Access Switch (LCAS) ICs Have Guaranteed 1500V/microsecond dV/dt Ratings for Central Office, Integrated Voice & Data and DSLAM Telephony Applications

The CPC769x series has the highest guaranteed dV/dt ratings (1500V/microsecond minimum) for all on-chip bidirectional switching power devices. This best-in-class dV/dt robustness rating makes the CPC769x LCAS devices the most reliable solution for Public Switched Telephone Network (PSTN) switching applications, particularly in harsh environments that are prone to lightning or surge events, as well as in Digital Subscriber Line Access Multiplexer (DSLAM) applications.

The dV/dt enhancements for the CPC769x devices are made in Clare’s bonded-wafer, silicon-on-insulator, 330V BCDMOS process with trench isolation, which has been used for many years in central office telecom equipment requiring long operational life (20+ years). The integrated LCAS IC in SOIC packaging replaces several electromechanical 2-Form-C relays, enabling higher density line card designs.

The LCAS IC features digitally-controlled high-voltage switching devices used between a Subscriber Line Interface Chip (SLIC) and the PSTN tip/ring line. LCAS provides make/break switch functions for battery feed, ringing, line test-out, test-in, and ringing test. Each high-voltage switch has integrated current-limiting and thermal shutdown, which works in conjunction with a voltage clamp, providing superior protection for the SLIC. The LCAS IC requires only a +5V supply for operation and TTL logic-level inputs for control.

The CPC7695BA, CPC7695BB, CPC7695BC are 10-pole devices, each in a 28-pin SOIC package, providing all telephony functions listed above. The A- and C-suffix versions feature a voltage feedback protection SCR, while the B-suffix version uses clamping diodes. The C version has an additional test monitor state mode. Package option “Z” provides designers with a smaller 20-pin SOIC version for higher density boards.

The CPC7691BA and CPC7691BB are simple 4-pole devices, each in a 16-pin SOIC package, for simple tip and ring line break and ringing injection/return control. The A-suffix version features a voltage feedback protection SCR while the B-suffix version uses clamping diodes.

Please contact us for further information or to request samples.