FIGURE 1: SCHEMATIC DIAGRAM TABLE 1: ELECTRICAL SPECIFICATIONS AT 25 OC ISDN U HIGH ISOLATION TRANSFORMER DESIGNED USE WITH AT&T's T7256 AND T7264 TRANCEIVER ICs. PARAMETER SPEC LIMITS TYP. MAX. MIN. TURNS RATIO: 7-10 : 5-1 (SEC :PRI) -------- PRIMARY INDUCTANCE (5-1): VOLTAGE = 0.250Vrms FREQUENCY = 1.0 KHZ 78.0 1 : 1.50 UNITS -------- + 3% 88.0 mHy 83.0 DOT/CHAMPHER DENOTES PIN #1 1 10 PRI #1B PRIMARY (LINE SIDE) PRIMARY DC BIAS CURRENT THD < 70dB 0 FULL PRIMARY LEAKAGE IND: (5-1) VOLTAGE = 0.250Vrms FREQUENCY = 10.0 KHZ -------- DCR: FULL PRIMARY (5-1) FULL SECONDARY (7-10) -------- 90 180 mA 4 SEC #1B 8 SECONDARY (CHIP SIDE) SEC #1A PRI #1A µHy 250 2 7 5 --------------- LONGITUDINAL BALANCE OF PRI. 1KHz TO 4 KHz 4KHz TO 160 KHz -60 -58 Cw/w @ 10KHz (PRI TO SEC) 10.80 11.50 12.50 13.50 Ohms Ohms -75 -65 --------------- dB dB -------- 80 120.0 pF 3000 -------- -------- Vac HI-POT: 50/60Hz PRIMARY TO SECONDARY NOTE: 1) PRIMARY CENTER TAP IS FORMED BY CONNECTING PIN#2 TO PIN#4 NOTE 1: INSULATION SYSTEM TO UL1950, IEC950: 1) ALL MATERIALS TO MEET "UL" , "CSA" , & "IEC" REQUIRMENTS 2) CONSTRUCTED TO MEET 5mm CREEPAGE REQUIRMENTS 3) ALL MATERIALS ARE CLASS B (130OC) OR BETTER. 4) VARNISH FINISHED ASSEMBLY FIGURE 2: PHYSICAL DIMENSIONS IN MM, (inches) 11 1 PIN#1 I.D. WHITE DOT 10 2 9 8 3 7 4 6 5 25.75 (1.014) MAX P PM-IU10 M YYWW 4.85 (.191) 1 5.00 (.197) 4-PLCS 17.00 (.670) MAX 5 2 3.0 (.118) 4.5 (.177) 20.0 (.787) 20.0 (.787) 1 26.0 (1.024) MAX CORE TAPED 3 4 5 0.8 DIA. 11-PLCS 20.0 (.787) 3.75 (.148) 5-PLCS EPC25 11 10 9 C L 8 7 6 18.75 (.738) P Premier M Magnetics Inc. UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN MM DIMENSIONAL TOLERANCES ARE: DECIMALS ANGLES .X + .50 + 0 O 30' .XX + .25 DO NOT SCALE DRAWING REV. 02/28//96 04/11/96 05/09/96 DESCRIPTION OF CHANGES ORIGINAL RELEASE INCREASED INDUCTANCE UPDATED DESIGN TO IMPROVE BOTH LP & REDUCE THD. ISDN U TRANSFOMER CONTROL DRAWING PREMIER P/N: PM-IU10 REVISION: 05/09/96 DRAWN BY: TOM O'NEIL REF: AT&T T7256/T7264 SCALE: NONE SHEET: 1 OF 3