The Intersil SLIC incorporates many of the BORSHT functions on a single IC chip. This includes DC battery feed, a ring relay driver, supervisory and hybrid functions. This device is designed to maintain transmission performance in the presence of externally induced longitudinal currents. Using the unique Intersil dielectric isolation process, the SLIC can operate directly with a wide range of station battery voltages.

Features
• Low Cost Version of the HC-5504B
• Capable of 5V or 12V (VB+) Operation
• Monolithic Integrated Device
• DI High Voltage Process
• Compatible With Worldwide PBX Performance Requirements
• Controlled Supply of Battery Feed Current for Short Loops (41mA)
• Internal Ring Relay Driver
• Allows Interfacing With Negative Superimposed Ringing Systems
• Low Power Consumption During Standby
• Switch Hook Ground Key and Ring Trip Detection Functions
• Selective Denial of Power to Subscriber Loops

Applications
• Solid State Line Interface Circuit for Analog and Digital PBX Systems
• Direct Inward Dial (DID) Trunks
• Voice Messaging PBXs
• Related Literature
    - AN549, The HC-5502S/4X Telephone Subscriber Line Interface Circuits (SLIC)
    - AN571, Using Ring Sync with HC-5502A and HC-5504 SLICs