ISDN U-INTERFACE TRANSFORMER Turns Ratio (9-7), (connect 10-6) : (5-1) PARAMETER Primary Inductance 1 1.50 : 1 MIN. MAX. UNITS 73 98 mH Flammability: Materials used in the production of these units meet requirements of UL94-VO and IEC 695-2-2 needle flame test. Pins 10 to 6 with 9 & 7 shorted. Return Loss (10-25 kHz) 20 dB DC Resistance (10-6) (Connect 9-7) 10.4 15.6 ohms DC Resistance (5-1) 5.2 7.8 ohms Isolation (Hi-Pot) (Line to Chip) 2000 IDC 40 Longitudinal Balance 281 Hz - 40 kHz Above 40 kHz -20 dB/decade Surge Voltage Capability A Surface Mount Version of this part is available add suffix "G" to part number VRMS 55 mA dB Use with Lucent Technologies chip sets T7256, T7234, T7237, and T7264. Metallic. @ 800 V Peak 10/700 µsec Long. @ 2400 V Peak 10/560 µsec Physical Dimensions inches (mm) 1 10 2 9 Top View 3 8 4 7 5 6 .470 (11.94) MAX. .100 (2.54) MIN. .040 (1.02) TYP. .920 (23.37) MAX. 1.070 (27.18) REF. .900 (22.86) REF. Bottom View .150 (3.81) TYP. Terminal Dimensions .020 (.051) X .040 (1.02) Typical. .800 (20.32) Termination Numbers for Reference Only. Notch Indicates Pin #1 Schematic Diagram Pri Sec 5 Chip Side 9 6 10 1 7 Rhombus Industries Inc. Transformers & Magnetic Products Line Side RHOMBUS P/N: T-1280 CUST P/N: DATE: 8/23/99 NAME: SHEET: 1 of 1 15801 Chemical Lane, Huntington Beach, CA 92649 Phone: (714) 898-0960 FAX: (714) 896-0971 www.rhombus-ind.com