8560GP

Data Sheet www.DataSheet4U.com April 2000 L8560 Low-Power SLIC with Ringing Features s s Description The L8560 full-feature, low-power subscriber line interface circuit (SLIC) is optimized for low power consumption while providing an extensive set of features. This part is ideal for ISDN terminal adapter applications and short-loop, power-sensitive applications such as pair gain and cable telephony. This part is also designed for PBX, DLC, or CO applications. The SLIC includes an auxiliary battery input and a battery switch. In short-loop applications, SLICs can be used in high battery to present a high on-hook voltage, and then switched to low battery to reduce off-hook power. To help minimize the required auxiliary battery voltage, the dc feed resistance and overhead voltage are set at 55 Ω and 6.7 V, respectively. This allows an undistorted on-hook transmission of a 3.14 dBm signal into a 900 Ω loop impedance. The device offers the reverse battery function. Using the reverse battery, the device can provide a balanced power ring signal to tip and ring. In this mode of operation, the battery switch is used to apply a high-voltage battery during ringing and a lower-voltage battery during the talk and idle states. Also included in the L8560 is a dc current-limit switch, which increases the dc current limit during power ringing. In addition, dc overhead voltage is reduced during the ring state. With the battery and current-limit switches, and overhead reduction, the L8560 can...