The HC-5509A1 telephone Subscriber Line Interface Circuit integrates most of the BORSCHT functions on a monolithic IC. The device is manufactured in a Dielectric Isolation (DI) process and is designed for use as a high voltage interface between the traditional telephone subscriber pair (Tip and Ring) and the low voltage filtering and coding/decoding func- tions of the line card. Together with a secondary protection diode bridge and “feed” resistors, the device will withstand 1000V lightning induced surges, in plastic packages. The SLIC also maintains specified transmission performance in the presence of externally induced longitudinal currents. The BORSCHT functions that the SLIC provides are: • Battery Feed with Subscriber Loop Current Limiting • Overvoltage Protection • Ring Relay Driver • Supervisory Signaling Functions • Hybrid Functions (with External Op-Amp) • Test (or Battery Reversal) Relay Driver In addition, the SLIC provides selective denial of power to subscriber loops, a programmable subscriber loop current limit from 20 to 60mA, a thermal shutdown with an alarm out- put and line fault protection. Switch hook detection, ring trip detection and ground key detection functions ar
The Intersil HC-5509A1 is a monolithic Subscriber Line Interface Circuit (SLIC) designed for use in PBX, Central Office, and Digital Loop Carrier systems. It integrates most BORSCHT functions on a single dielectric isolation (DI) process chip, providing high-voltage protection and low-voltage filtering capabilities between the subscriber pair and line card circuits.
The document provides comprehensive electrical specifications, including A.C. transmission parameters, D.C. parameters for loop current programming, and relay driver output characteristics. It also details absolute maximum ratings, operating conditions for various package types (Ceramic DIP, Plastic DIP, PLCC, SOIC), and pin descriptions for interfacing with external components.
| Supply Voltage (Vp.) | +5V |
|---|---|
| Loop Current Limit Range | 20 to 60mA |
| Ring Sync Pulse Width | 50 to 500 us |
| Input Offset Voltage | +5 mV |
| Small Signal GBW | 1 MHz |
The device provides Battery Feed with Subscriber Loop Current Limiting, Overvoltage Protection, Ring Relay Driver, Supervisory Signaling Functions, Hybrid Functions, and Test Relay Driver.
The programmable subscriber loop current limit ranges from 20 to 60mA.