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.

Features
■ Full-feature set for central office applications
■ Also ideal for ISDN terminal adapters, pair gain, and cable telephony applications
■ Auxiliary input for second battery, and internal switch to enable its use to save power in short telephone loops
■ 5 V only operation or optional ±5 V operation for reduced power consumption
■ Low active power (85 mW typical) and scan power (61 mW typical) with 5 V only operation
■ Low active power (68 mW typical with auxiliary battery) and scan power (45 mW typical) with ±5 V operation
■ Quiet tip/ring polarity reversal
■ Per-line ringing available for short loops
■ Reduced overhead and increased current limit during ring mode for lower-battery operation or increased ring loop length
■ Supports meter pulse injection
■ Distortion-free full duplex from 0 mA dc loop current on-hook transmission
■ Convenient operating states:
    — Forward powerup
    — Polarity reversal powerup
    — Forward sleep
    — Ground start
    — Disconnect
■ Adjustable supervision functions:
    — Off-hook detector with longitudinal rejection
    — Ground key detector with longitudinal rejection
    — Ring trip detector
■ Independent, adjustable dc and ac parameters:
    — dc feed resistance (44-pin PLCC version)
    — Loop current limit
    — Termination impedance
■ Thermal protection