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| SEMICONDUCTOR HC5521 SLIC Subscriber Line Interface Circuit Description The HC5521 is a Monolithic Subscriber Line Interface Circuit (SLIC) for Analog Subscriber Line cards in Central Office and PABX switches. 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. 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. ADVANCE INFORMATION January 1997 Features * Normal and Reversed DC Feed * 30mA Current Limit * Ringing, Test-In, and Test-Out Relay Drivers * 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 * PABX/CO Line Circuits Ordering Information PART NUMBER HC5521CQ HC5521CM TEMP. RANGE (oC) 0 to 70 0 to 70 PACKAGE 44 Ld MQFP 44 Ld PLCC PKG. NO. Q44.10x10 N44.65 Block Diagram RX TA TB GKDO SHDO D2PRI D3PDI D4RCI D5TBI D6TAI AGND BGND RGND VBAT VCC VEE BIAS BATTERY REFERENCE RING CONTROL RD RBH RBL CRTD RPSB POWER MANAGEMENT RPSR RPST RPSG LOGIC 2-WIRE INTERFACE TIP TIPSEN RINGSEN RING TEST CONTROL 4-WIRE INTERFACE / Z0 TX TX4W RN KZO CP RDC CDC CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright (c) Harris Corporation 1997 File Number 4265 4-35 |
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