This document is an introduction to the Mitel MH88622 product. It mainly introduces the features of the product, including dual line interface circuit, 2-4 wire conversion, constant current supply, battery supply to the line, current overload protection, etc.
The MH88622 is a dual subscriber interface (SLIC) that provides ringing generation, on‑hook transmission, transformer‑less 2‑4 wire conversion, constant current line feed, tip‑ring reversal and over‑current protection. It is implemented in a 40‑pin SIL package and operates from a -48 V battery and ±5 V supplies.
The document lists pin assignments, absolute maximum ratings, DC and AC electrical characteristics, functional description, approvals and mechanical dimensions, enabling designers to integrate the SLIC into telephone line cards.
| Supply Voltage (VEE) range | -15 V to +0.3 V |
|---|---|
| Operating Temperature | -40 °C to +85 °C |
| Loop Current (ILoop) | 25 mA to 40 mA |
| Ringing Frequency | 17 Hz to 68 Hz |
| Power Consumption | 300 mW |
The device operates from –40 °C to +85 °C.
The internal ringing generator can produce frequencies between 17 Hz and 68 Hz.
The MH88622 is supplied in a 40‑pin SIL package.