A hybrid integrated trunk and subscriber line interface
A two-chip hybrid integrated trunk and subscriber line interface has been fabricated for voice and data applications. This paper will discuss features including a programmable battery feed with lightning protection, battery-reversal signaling, 2-4 wire conversion, loop closure detection and power down capability.
A switching regulator and lightning protector for a subscriber line interface circuit
Two monolithic ICs, a switching regulator and a crowbar protector circuit fabricated in a 90-V complementary bipolar technology are described. These devices enhance the performance of a basic subscriber-line interface circuit (SLIC) by extending the range to the customer so that 20-mA DC feed current can be supplied to a 2800-/spl Omega/ loop without the need for a -72-V office battery. The power dissipation of the entire SLIC subsystem is at most 1.5 W for any length of subscriber loop. All circuitry is robustly protected from foreign 60-Hz and lightning voltages.
Buried injector logic: Second generation I2L performance
A vertically structured I<sup>2</sup>L gate, integrated with linear SBC processing, will be discussed. Previous (standard I<sup>2</sup>L) logic/linear function conflicts stemming from structural constraints have been reconciled, demonstrating second generation I<sup>2</sup>L performance with unrestrained SBC capability.