MH89625C

® MH89625C OPS/DID PCM SLIC Preliminary Information Features Input impedance variants: - 600Ω - 200Ω + 680Ω // 0.1µ F - 200Ω + 560Ω // 0.1µ F Operates with a wide range of battery voltages Constant current battery feed with constant voltage fallback for long loop drive capabilities Overvoltage and short circuit protection Off-hook detection and LED indicator drive Dial pulse detection Ring trip filter with auto ring trip Ring relay driver plus three more uncommitted relay drivers Transformerless 2W to 4W conversion A/D and D/A conversion Conforms to A-Law PCM Analog and digital loopback Conforms to CCITT k.20 overvoltage surge requirements with external primary protection circuitry ISSUE 4 May 1995 Ordering Information MH89625C MH89625C- 5 MH89625C- 6 600 Ω 200 Ω + 680 Ω // 0.1 µ F 200 Ω + 560 Ω // 0.1 µ F 40 Pin DIL Package Description The Mitel MH89625C SLIC (Subscriber Line Interface Circuit) provides a complete interface between an off-premise telephone line and a digital switching system. All BORSCHT functions of Battery Feed, Overvoltage Protection, Ringing Feed, Line Supervision, Codec, 2-4 Wire Hybrid and Test are provided requiring only a few external components. The input impedance conforms with Chinese standard requirements. The device is fabricated using thick film hybrid technology which incorporates various technologies for high voltage capability, optimum circuit design and very high reliability. Applications Off premise...