Le79R70 - Zarlink

Le79R70 Ringing Subscriber Line Interface Circuit

The Le79R70 Ringing Subscriber Line Interface Circuit (RSLIC) device is a bipolar monolithic SLIC that offers on-chip ringing. Designers can achieve significant cost reductions at the system level for short-loop applications by integrating the ringing function on chip. Examples of such applications would be ISDN Terminal Adaptors and set top boxes. Using a C.

Features

„ Ideal for ISDN-TA and set top applications „ On-chip ringing with on-chip ring-trip detector „ Low Standby state power „ Battery operation: — VBAT1:
  –40 V to
  –67 V — VBAT2:
  –19 V to VBAT1 „ On-chip battery switching and feed selection „ On-hook transmission „ Polarity reversal option „ Programmable constant-current feed „ Programmable open circuit voltage „ Programmable loop-detect threshold „ Current gain = 1000 „ Two-wire impedance set by single component „ Ground-key detector „ Tip Open state for ground-start lines „ Internal VEE regulator (no external
  –5 V power supply required) „ Two on.