LE79271MQCT [Microchip]

The LE79271 Next Generation Subscriber Line Interface Circuit (SLIC) device, in combination with an LE792388 SLAC device, implements a DSL friendly, high density universal telephone line interface. This enables the design of a low cost, high performance, fully software programmable line interface with worldwide applicability. All AC, DC, and signaling parameters are programmable. Additionally, the NGCC chip-set has integrated self-test and line-test capabilities to resolve faults to the line or line circuit.

Designed to minimize POTS transients, optimizing CRC performance for triple play applications

Best-in-class GR-844 equivalent testing
• Fully validated test primitives and host routines
• Guaranteed performance parameters

Optimized for best-in-class density

Monitor of two-wire interface voltages and currents supports:
• Voice transmission
• Internal ringing generation
• Programmable DC feed characteristic
• Current limited and independent of battery
• Selectable off-hook and ground-key thresholds
• Subscriber line diagnostics
• Leakage and loop resistance
• Line capacitance and bell capacitance
• Foreign voltage sensing
• Power cross and fault detection

Supports 85 Vrms internal ringing
• Supports balanced and unbalanced ringing

3.3 V and battery supplies
• Supports two negative and one positive battery

Dual battery operation for system power saving
• Automatic battery switching
• Intelligent thermal management

Compatible with inexpensive protection networks

Metering capable
• 12 kHz and 16 kHz
• Smooth polarity reversal

Tip-open mode supports ground start signaling

Integrated test load switch

5 REN with DC offset

Features with Le79124 VCP
• 72 channel call aggregation
• GR-844 equivalent line testing