| DISTINCTIVE CHARACTERISTICS Ideal for short-loop applications Ideal for ISDN terminal adaptor and fixed radio access applications On-chip ringing with on-chip ring-trip detector Low standby state power Battery operation: —VBAT1: –40.5 V to –75 V —VBAT2: –19 V to VBAT1 On-chip battery switching and feed selection On-hook transmission Two-wire impedance set by single external impedance Programmable constant-current feed Programmable Open Circuit voltage Programmable loop-detect threshold Current gain = 1000 Ground-key detector Tip Open state for ground-start lines Polarity reversal option available Internal VEE regulator (no external –5 V power supply required) Two on-chip relay drivers and snubber circuits (32 PLCC) |
