STLC3055Q

Specialized Overview

The STLC3055Q is a subscriber line interface circuit (SLIC) designed for Wireless Local Loop and ISDN-Terminal Adaptor applications. It operates from a single positive supply voltage ranging from +5.5V to +15.8V and internally generates the required negative battery voltage via an on-chip DC/DC converter controller driving an external MOS switch. The device implements full BORSHT functions, including constant current feed programmable from 20mA to 40mA and off-hook detection thresholds adjustable between 5mA and 9mA. It features integrated ringing generation producing a typical balanced signal of 65V peak, metering pulse injection capabilities, and soft battery reversal with programmable transition times. The component supports a parallel control interface with 3.3V logic levels and operates within an ambient temperature range of -40°C to +85°C.

Specialized Feature Summary

• Single-supply operation with integrated DC/DC converter controller for self-generated negative battery voltage
• Complete BORSHT functionality including programmable constant current feed and off-hook detection
• Integrated ringing generator with trapezoidal waveform shaping and ring trip detection
• Metering pulse generation with programmable amplitude, frequency, and echo cancellation

Specialized Applications

• Wireless Local Loop (WLL) subscriber line interfaces
• ISDN-Terminal Adaptor (TA) loop circuits
• Telecommunications equipment requiring BORSHT implementation

Specialized Procurement Notes

Verify the specific ordering suffix to confirm package type and tape-and-reel configuration. Ensure the external components list matches the intended application parameters, particularly regarding the DC/DC converter inductor and MOSFET specifications. Confirm that the PCB layout adheres to the recommended star ground configuration to minimize noise coupling between the switching converter and analog sections.

Specialized Selection Notes

Select this component when a single positive supply is available and internal generation of negative battery voltage is required. Consider the external component count for the DC/DC converter and metering pulse filters when evaluating bill of materials. Verify that the maximum junction temperature rating aligns with the thermal constraints of the target enclosure and operating environment.

Specialized Part Context

The STLC3055Q belongs to the SLIC family developed by STMicroelectronics using BCD100II technology. This process allows high-voltage integration suitable for telecom line interfacing. The device is distinct from standard low-voltage logic ICs due to its ability to handle line voltages and generate negative rails internally, simplifying power supply design for WLL and ISDN applications.

Specialized Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative SLICs based on pin compatibility, BORSHT feature sets, and single-supply capability if direct replacement is necessary.