Mitel MH88615 ONS SLIC is a complete interface between a switching system and a subscriber loop, providing various functions including battery feed, integral ringing amplifier feed, 2W to 4W conversion current feed, off-hook and dial pulse detection, etc. The device is packaged in a 20-pin single-in-line package and is suitable for applications such as PABX, pair gain systems, satellite communication systems, key telephone systems, marine systems, and cordless local loops.
The Mitel MH88615 ONS Subscriber Line Interface Circuit (SLIC) provides battery feed, an integral ringing amplifier, 2‑4 W conversion, constant current feed, off‑hook and dial‑pulse detection in a 20‑pin single‑in‑line package. It is intended for PABX, pair‑gain, satellite communication, key telephone, marine, and cordless local loop applications.
The document includes functional description, pin assignments, absolute maximum ratings, recommended operating conditions, DC and AC electrical characteristics, and mechanical dimensions for the three regional variants (Germany, UK, North America).
| Package | 20‑pin SIL |
|---|---|
| Supply Voltage (VDD) | +5 V |
| Battery Voltage (VBat) | -48 VDC |
| Loop Current Range | 18 mA – 30 mA |
| Ringer Equivalence Number (REN) | 5 |
| Return Loss (variant MH88615‑1) | 20 dB (200 Hz‑500 Hz) |
| Maximum Operating Temperature | 125 °C |
Pin 6 (VBat) supplies the battery voltage, typically -48 VDC, to the subscriber line.
Pin 14 (SHK) is the Switch Hook Detect output; it goes high when the line is off‑hook and low when the loop resistance is too high.