LE7920-1
SLIC (Subscriber Line Interface Circuit)
Product is discontinued and not allowed for new designs.
Overview
| The Le7920-1 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
- Control states: Active, Ringing, Standby, and Disconnect
- Low standby power (35 mW)
- -19 V to -58 V battery operation
- On-hook transmission
- Two-wire impedance set by single external impedance
- Programmable constant-current feed
- Programmable loop-detect threshold
- Programmable ring-trip detect threshold
- No -5 V supply required
- Current Gain = 500
- On-chip Thermal Management (TMG) feature
- Four on-chip relay drivers and relay snubbers, 1 ringing and 3 general purpose (32 PLCC)
