MH88610

MH88610 ® Subscriber Line Interface Circuit (SLIC) Preliminary Information Features Transformerless 2-wire to 4-wire conversion Battery and ringing feed to line Off-hook and dial pulse detection Ring ground over-current protection Loop length detection Constant current feed MH88610 ISSUE 6 April 1995 Ordering Information 20 Pin SIL Package 0° C to 70° C Description Applications Line interface for: PABX Intercoms Key Telephone Systems Control Systems The Mitel MH88610 Subscriber Line Interface Circuit provides a complete interface between a switching system and a subscriber loop. Functions provided include battery feed and ringing feed to the subscriber line, 2-Wire to 4-Wire hybrid interfacing, constant current, loop length and dial pulse detection. The device is fabricated using thick film hybrid technology in a 20-pin single in-line package. LPGND VBat VDD VEE GNDA TF TIP RING RF RV Current &Voltage Sensing 2-Wire to 4-Wire Conversion VR VX Over Current Protection Constant Current Feed Loop Supervision VRef LOOP SHK CAP Figure 1 - Functional Block Diagram 2-97 MH88610 TF LPGND VR VRef VEE GNDA LOOP VX TIP RING RF VDD IC IC RV IC NC VBat CAP SHK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Preliminary Information Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name TF LPGND VR VRef VEE GNDA LOOP VX TIP RING RF VDD IC IC RV IC NC VBat CAP SHK Description TF Tip Feed. Internal ...