The Le79242 Dual Intelligent Subscriber Line Interface Circuit (ISLIC) device, in combination with an Le79228x ISLAC device, implements the telephone line interface function. This enables the design of a low cost, high performance, fully software programmable line interface for multiple applications worldwide.
Feature
- Monitor of two-wire interface voltages and currents supports:
- Voice transmission
- Programmable DC feed characteristics
- Independent of battery
- Current limited
- Selectable off-hook and ground-key thresholds
- Subscriber line diagnostics
- Leakage resistance
- Loop resistance
- Line capacitance
- Bell capacitance
- Foreign voltage sensing
- Power cross and fault detection
- Supports 115 VPK internal ringing
- 5 REN with DC offset
- 3.3-V and battery supplies
- Dual battery operation for system power saving
- Automatic battery switching
- Intelligent thermal management
- Compatible with inexpensive protection networks
- Accommodates low tolerance fuse resistors or PTC thermistors
- Metering capable
- 12 kHz and 16 kHz
- Smooth polarity reversal
- Tip-open state supports ground start signaling
- Integrated test load switch/relay drivers
Applications
- Enables a cost-effective voice solution for short-to-medium loop applications providing POTS and integrated test capabilities
- VoIP
- DLC
- IVD
