HC5521 S E M I C O N D U C T O R ADVANCE INFORMATION SLIC Subscriber Line Interface Circuit January 1997 Features Description • Normal and Reversed DC Feed The HC5521 is a Monolithic Subscriber Line Interface Circuit (SLIC) for Analog Subscriber Line cards in Central Office and PABX switches. • 30mA Current Limit • Ringing, Test-In, and Test-Out Relay Drivers The HC5521 provides a comprehensive set of features for these applications including loop reversal, ground key detection, zero crossing ring relay operation, long loop drive and a mutually independent setting of the receive and transmit gains, and the two-wire impedance synthesis. An option is also provided for eliminating transhybrid balance on-chip. Advanced power management features combined with a small 44 lead MQFP package allow significant board space to be freed up for additional line circuits. • Ground Key Detector with Seperate Logic Output • Thermal Shutdown Protection with Alert Signal • On-Hook Transmission • Selectable Transmit and Receive Gain Setting • Selectable 2-Wire Impedance Matching • Zero Crossing Ring Trip Detection and Ring Relay Release • Parallel Digital Control and Status Monitoring • Protection Resistors inside Feedback Loop allows the use of PTC Devices without Impact on Longitudinal Balance Applications The HC5521 is fabricated in a Harris state of the art Bonded Wafer High Voltage process, providing freedom from traditional JI latch-up phenomena without the use of additional power supply filtering components or substrate tie connections. The very low parasitics and leakages associated with this process provide an exceptionally flat performance over frequency and temperature. Ordering Information • PABX/CO Line Circuits PART NUMBER TEMP. RANGE (oC) PACKAGE PKG. NO. HC5521CQ 0 to 70 44 Ld MQFP Q44.10x10 HC5521CM 0 to 70 44 Ld PLCC N44.65 Block Diagram RX TX TX4W RN KZO TA TB TEST CONTROL 4-WIRE INTERFACE / Z0 GKDO TIP SHDO 2-WIRE INTERFACE D2PRI D3PDI LOGIC TIPSEN RINGSEN RING D4RCI D5TBI RD D6TAI RING CONTROL AGND BIAS BATTERY REFERENCE RPSB POWER MANAGEMENT VCC VEE RDC RPST CDC CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. © Harris Corporation 1997 RPSR RPSG CP Copyright RBL CRTD BGND RGND VBAT RBH 4-35 File Number 4265