The Intersil HC5503 low cost SLIC is optimized for use in small Analog or mixed Analog and Digital Key Telephone Systems (KTS) or PBX products. The low component count solution and surface mount package options, enable a small desktop Key System/PBX product to be achieved. The internal power dissipation of the end product is minimized by the low power consumption and minimal power supply voltage requirements of the HC5503.

Features
• Wide Operating Battery Range (-21V to -44V)
• Single Additional +5V Supply
• 25mA Short Loop Current Limit
• Ring Relay Driver
• Switch Hook and Ring Trip Detect
• Low On-Hook Power Consumption
• On-Hook Transmission
• ITU-T Longitudinal Balance Performance
• Loop Power Denial Function
• Thermal Protection
• Supports Tip, Ring or Balanced Ringing Schemes
• Low Profile Surface Mount Packaging
• Pin Compatible with Industry Standard HC5504B SLIC
• Pb-free Available

Applications
• Analog Subscriber Line Interfaces in Analog Key Systems and Digital ISDN PABX Systems
• Related Literature
    - AN571, Using Ring Sync with HC-5502A and HC-5504 SLICs