STLC3055QTR

Specialized Overview

The STLC3055QTR is a Subscriber Line Interface Circuit (SLIC) optimized for Wireless Local Loop and ISDN-Terminal Adaptor applications. It implements all key BORSHT functions using a single supply voltage ranging from +5.5V to +15.8V. An on-chip DC/DC converter controller drives an external MOS switch to self-generate the required negative battery voltage. The device features a parallel control interface with 3.3V logic levels, integrated ringing generation, and metering pulse capabilities. It operates within an extended temperature range of -40°C to +85°C and includes integrated thermal protection.

Specialized Feature Summary

• Implements complete BORSHT functionality including feeding, supervision, signaling, and transmission.
• Generates negative battery voltage internally via a DC/DC converter controller driving an external P-channel MOSFET.
• Provides integrated ringing generator producing balanced trapezoidal waveforms with programmable transition times.
• Features programmable constant current feed and off-hook detection thresholds for flexible loop configuration.

Specialized Applications

• Wireless Local Loop (WLL) subscriber line interfaces
• ISDN-Terminal Adaptor (TA) line termination circuits
• Telecommunications equipment requiring single-supply SLIC solutions

Specialized Procurement Notes

Verify the specific ordering suffix QTR indicates tape and reel packaging when sourcing components. Confirm that the device version matches the required clock synchronization features, as certain revisions allow internal clock generation by connecting the CLK pin to CVCC. Ensure external component selection aligns with the specific application requirements for efficiency and noise performance.

Specialized Selection Notes

Select external components based on target line impedance, protection resistor values, and desired metering pulse characteristics. The RSENSE resistor determines the peak current limit for the DC/DC converter, impacting power availability during ring trip events. Choose the external MOSFET to meet voltage and current specifications, ensuring low on-resistance for optimal efficiency in high-impedance feeding modes.

Specialized Part Context

The STLC3055 belongs to a family of specialized analog interface circuits designed for telecommunications line interfacing. Unlike standard digital microcontrollers, this component handles high-voltage analog signals and power conversion directly. It serves as a bridge between low-voltage digital control systems and the higher voltage requirements of telephone lines, integrating complex power management and signal conditioning into a single package.

Specialized Replacement Considerations

Direct replacements must support single-supply operation with internal DC/DC generation for negative battery. Verify compatibility with 3.3V logic control interfaces and ensure equivalent BORSHT feature sets. Check if alternative devices require external clock synchronization or offer similar thermal protection mechanisms for direct board-level substitution.