Typical Application Circuit* for the LXT441 Utilizing Rhombus Transformers 35 pF 35 pF 8.192 MHz Rhombus P/N T-998 or T-1195 XTALI TD SCTE RD SCR 1 DTE or SCC XTALO 1CT : 1CT Rt TTIP 6.2V Rs 28 Ω Cs .01µ F 2 Primary Line Protection 6.2V DTR RTS Rt TRING 3 DSR CTS RI DCD LCRT LCTR LXT441 AD <0:7> RD WR CS ALE INT BSY RST Micro Controller 2kΩ 2kΩ +5V +5V +5V +5V +5V 4 Current Sense RTIP 1CT : 1CT 30.1 k Ω Rr 6.2V Primary Line Protection 1kΩ VINT 6.2V RRING 30.1 k Ω TEST1 N/C TEST2 DGND AVCC TVCC DVCC AGND TGND DGND 0.47 µ F Rr Rhombus P/N T-998 or T-1195 Notes: 1. Minimum required signal set for DTE/SCC communication. 2. EIA530 input control signals. Tie to GND if not used. 3. Additional optional EIA530 signals. 4. Connect all +5V supplies to same power plane at bypass capacitor. 0.47 µ F 0.47 µ F The T-998 is a 10 Pin EP style ferrite geometry. (Bobbin wound Thru hole package) A surface mount version of this part is available, add suffix "G". The T-1195 is a toroid wound, encapsulated, surface mount transformer. Please refer to data sheets for full details. Specifications subject to change without notice. Rhombus Industries Inc. *SOURCE: Level One LXT441 Data Sheet (August 1998 Revision 2.2) 15801 Chemical Lane, Huntington Beach, CA 92649-1595 Tel: (714) 898-0960 • Fax: (714) 896-0971