The 3.3V family of ringing subscriber line interface circuits (SLIC), ISL5585, supports analog Plain Old Telephone Service (POTS) in short and medium loop length, wireless and wireline voice over broadband applications. Ideally suited for customer premise equipment, this family of products offers flexibility to designers with high ringing voltage and low power consumption system requirements. The ISL5585 family is capable of operating with 100V ringing battery supply, which translates directly to the amount of ringing voltage supplied to the subscriber. With the high operating voltage, subscriber loop lengths can be extended to 500Ω (i.e., 5,000 feet) and beyond, allowing this family to serve emerging Fiber In The Loop (FITL) markets. Other key features across the product family include: 3.3V VCC operation, low power consumption, ringing using sinusoidal or trapezoidal waveforms, robust auto-detection mechanisms for when subscribers go on or off hook, and minimal external discrete application components. Integrated test access features are also offered on selected products.
The ISL5585 family is a 3.3 V ringing subscriber line interface circuit (SLIC) designed for voice‑over‑broadband applications such as VoIP, FTTH and remote subscriber units. It supports a 100 V ringing battery supply, enabling long loop lengths and flexible deployment in customer premise equipment.
The datasheet details the device’s features, including low standby power consumption, programmable transient current limit, balanced and unbalanced ringing modes, and thermal shutdown. It also lists ordering options, pin descriptions for PLCC and QFN packages, absolute maximum ratings, electrical specifications, and package dimensions.
| Operating Voltage (VCC) | 3.3 V |
|---|---|
| Maximum Ringing Battery Supply | 100 V |
| Low Standby Power Consumption | 65 mW (at 75 V) |
| Package Types | 28‑lead PLCC and 32‑lead QFN |
The ISL5585 can operate with a 100 V ringing battery supply.
It is offered in 28‑lead PLCC and 32‑lead QFN surface‑mount packages.
Low standby power consumption is 65 mW when powered at 75 V.