U Interface Transformer (2B1Q Coding Applications) Designed for use with Motorola MC145472 Turns Ratio ( + 3 % ) (Line : Chip) PARAMETER MIN. MAX. UNITS 25.38 28.62 mH Primary DC Resistance 7.0 ohms Secondary DC Resistance 3.0 ohms Primary Inductance (Line Side) 1 Flammability: Materials used in the production of these units meet requirements of UL94-VO and IEC 695-2-2 needle flame test. 2.0 : 1 Pins 7 to 5 with 8 & 6 shorted. Isolation (Hi-Pot) 2000 DC Bias Schematic 2 VRMS 80 5 8 Chip Side 6 mA Return Loss 10KHz & 25 KHz 20 dB Longitudinal Balance (281 Hz to 40 kHz) 55 dB 11 Line Side 7 NOTE: 1. Tested @10 kHz / 700 mV, on Line Side Operating Temp. Range -400C to +850C Physical Dimensions inches (mm) Primary is Line Side (Pins 5,8,6,7) Secondary is Chip Side (Pins 2,11) Surge Voltage Capability Metallic Voltage: 800 V peak, 10/560 µS Longitudinal Voltage: 2400 V peak, 10/700 µS RM-8 Package RHOMBUS P/N: T-13231 CUST P/N: DATE: 7/2/96 Rhombus Industries Inc. Transformers & Magnetic Products NAME: SHEET: 1 of 1 15801 Chemical Lane, Huntington Beach, CA 92649 Phone: (714) 898-0960 FAX: (714) 896-0971 www.rhombus-ind.com