LE7942B
SLIC (Subscriber Line Interface Circuit)
Product is discontinued and not allowed for new designs.
Overview
The Le7942B Subscriber Line Interface Circuit implements the basic telephone line interface functions, and enables the design of low cost, high performance, POTS line interface cards. |
Detailed Block Diagram

Features & Benefits
- Programmable constant-current feed
- Receive current gain = 500
- Programmable loop-detect threshold
- Low standby power
- Performs polarity reversal
- Ground-key detector
- Pin for external ground-key noise filter capacitor
- Test relay driver option
- Compatible with Le7942 Device
- Tip Open state for ground-start lines
- -19 V to -58 V battery operation
- Ideal for PBX and KTS applications
- On-chip switching regulator for low-power dissipation
- Can be used with or without the on-chip switching regulator
- On-hook transmission