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