ISDN S-INTERFACE
TRANSFORMERS
Surface Mount, Single, 1.5 and 3 KVrms
NE
W!
Meets the pulse waveform template of CCITT I.430,
using recommended transformer and chip pair
3 KV, reinforced to IEC950 and certified by BABT
and AUSTEL
Compact SMT transfer-molded package with 1.5 KV
and 3 KV compatible footprints
Options for Terminal, Line Card and NT Box
Applications
Electrical Specifications @ 25°C — Operating Temperature 0°C to 70°C
OCL Pri
(mH MIN)
22
22
22
22
22
22
22
22
22
L
L
Sec
(µH MAX)
5
5
10
5
15
15
15
15
15
C
W
/
W
(pF MAX)
120
120
150
120
120
45
45
45
45
CD Pri
(pF MAX)
180
180
180
180
180
100
100
100
100
DCR Pri
(Ω MAX)
2.5
2.5
2.5
2.5
1.3
1.3
1.3
1.3
1.3
DCR Sec
(Ω MAX)
5.2
2.5
6
5
3.0
3.0
1.3
3.5
3.0
∆
I
DC
(mA MAX)
3
3
3
3
3
3
3
3
5
Isolation
Voltage
(Vrms MIN)
1500
1500
1500
1500
1500
3000
3000
3000
3000
Primary
Pins
1-10, 5-6
1-10, 5-6
1-10, 5-6
1-10, 5-6
6-7,9-10
6-7, 9-10
6-7, 9-10
6-7, 9-10
6-7,9-10
Package /
Schematic
VAL 1/B
VAL 1/C
VAL 1/C
VAL 1/C
VAL 1/A
VAL 2/A
VAL 2/A
VAL 2/A
VAL 2/A
Part
Ratio Pri:Sec
Number
( ± 2%)
T5020
T5021
T5022
T5023
T5033
T5024
T5025
T5026
T5036
1:2
1:1
1:2.5
1:2
1:2
1:2
1:1
1:2.5
1:2
Note:
See table for package heights (1 and 2).
Mechanical
VAL
.550
13,97
.100
2,54
10
PE-50XX
Date Code
Country of
Origin
Schematic
.050
1,30 TYP
.120
3,05 TYP
A
(8-pin)
10 9 7
6
4
B
(8-pin)
7
3
C
(10-pin)
8
6
.550
13,97
5
.200
5,08
2
°
.760 .520
19,30 13,20
.400
10,16
.200
5,08
1
.100
2,54
SUGGESTED PAD LAYOUT
1
2 4
5
1 10 5
6
1 10 5
6
A
MAX
.060
1,52
Package
Type
Package
Height (A MAX)
0
°-
8
°
.010
0,25
.715
18,16
VAL 1
VAL 2
.394/10,00 MAX
.429/10,88 MAX
Dimensions:
Inches
mm
Unless otherwise specified, all tolerances are ± .010
0,25
NOTE:
Optional tape and reel packaging can be
ordered by adding a
“T”
suffix to the part number
(ie:T5020T).
U.S.A:
TEL 619 674 8100
•
EUROPE:
TEL 441 483 428 877
•
ASIA:
TEL 886 7 821 3141
•
WEB:
http://www.pulseeng.com
T633.A (1/98)
ISDN S-INTERFACE
TRANSFORMERS
Surface Mount, Single, 1.5 and 3 KVrms
Transformer Selection Guide
IC Manufacturer
AMD
Lucent
Mietec
Mitel
Motorola
National
NEC
Siemens
SGS Thomson
VLSI
Yamaha
IC Part Number
AM 79C30A
T7250/ T7252/ T7256
T7259/ T7903/ T7234
MTC-2072
MT8930
MC145474/ 145475
MC145574
TP3420 / 3421
D98201
PEB 2080/ 2081 / 2085
PEB 2084/ 2086 / PSB 2186
PEB 8091/ 8191
ST5420/ 5421
VN580060
YM 7405B
Pulse Part Number
Transmit & Receive
1.5 KV*
T5020/T5023/T5033
T5022
T5020/T5023/T5033
T5020/T5023/T5033
T5020/T5023/T5033
T5021
T5022
T5020/T5023/T5033
T5020/T5023/T5033
T5020/T5023/T5033
T5020/T5023/T5033
T5020/T5023/T5033
T5020/T5023/T5033
Pulse Part Number
Transmit & Receive
3 KV*
T5024/T5036
T5026
T5024/T5036
T5024/T5036
T5024/T5036
T5025
T5026
T5024/T5036
T5024/T5036
T5024/T5036
T5024/T5036
T5024/T5036
T5024/T5036
*
NOTE:
Choice of Transformer depends upon application:
1.5KV Options:
T5020 AND T5023 offer 8 and 10 pin variations
T5033 has compatible footprint to 3 KV transformers
3KV Options:
T5024 is suitable for Terminal and Line Card Applications
T5036 is suitable for NT Applications due to 5mA
∆Idc
Packaging Information
Package
VAL1
VAL2
Part Weight
4.7 grams
5.0 grams
Parts/Tube
35
35
Parts/Reel
150
150
Reel Diameter
13"
13"
Tape Width
32 mm
32 mm
Pitch
24 mm
24 mm
SMT Common Mode Chokes
Part Number
Number
of Lines
Inductance
Peak Common
Mode Attenuation
Application
Isolation
Voltage
(MAX)
500 Vrms
500 Vrms
500 Vrms
500 Vrms
DCR
Ω
(Ω MAX)
Data
Sheet
L
OW
F
REQUENCY
C
HOKES
PE-65853
4-Line
H
IGH
F
REQUENCY
C
HOKES
PE-65854
PE-65857
PE-68624
4-Line
4-Line
2-Line
4.7 mH ±30%
47 µH Min
22.5 µH Min
47 µH Min
1 MHz
30 MHz
50 MHz
30 MHz
Improve Balance
EMI Reduction
EMI Reduction
EMI Reduction
1.20
0.38
0.22
0.40
G002
G002
G002
G002
NOTE:
The “High Frequency” 4-wire common mode chokes provide an effective means of compliance with national and international regu-
lations on EMI. They are designed to be used in conjunction with Pulse's ISDN S-Interface transformers. A high inductance “Low
Frequency” common mode choke is recommended to improve balance or to correct inherent unbalances of some ISDN S-Interface
circuits.
U.S.A:
TEL 619 674 8100
•
EUROPE:
TEL 441 483 428 877
•
ASIA:
TEL 886 7 821 3141
•
WEB:
http://www.pulseeng.com
T633.A (1/98)
ISDN S-INTERFACE
TRANSFORMERS
Application Notes
Surface Mount, Single, 1.5 and 3 KVrms
The S-Interface is the standardized four wire digital telephone
access point defined by the CCITT I-Series recommendations
for the Integrated Service Digital Network. This “basic rate
access” accommodates two 64 Kbps “B-channels” for informa-
tion, one 16 Kbps “D-channel” intended for signaling and con-
trol, and 48 Kbps for framing and other purposes, giving a total
rate of 192 Kbps. The CCITT physical layer recommends that
the user network interface be transformer coupled as shown in
our typical application notes.
R1
SXna
D1
V
DD
T5024
1
D5
D7
D6
2
4*
5
9
*7
6
10
9
*7
6
2:1
Choke
10
R2
SXnb
D2
ZD2
PEB 2086
SRna
R3
D3
V
DD
R5
D8
D9
R6
T5024
2:1
1
2
4*
5
R4
SRnb
D4
Figure 1:
Typical S-Interface Application Circuit for Siemens: PEB 2086*
+5V
These protection
diodes are optional
in NT mode
R1
D4
D3
R2
1
10
5
6
D1
T5022
3
Choke
Txp
Txn
+5V
These protection
diodes are optional
in NT mode
D8
D7
D6
D2
1 : 2.5
8
MC 145574
Rxp
R3
1
10
5
6
T5022
3
R4
Rxn
D5
1 : 2.5
8
Figure 2:
Typical S-Interface Application Circuit for Motorola: MC 145574*
*NOTE:
Refer to Silicon Vendors Application Notes for more details on power supply connection and specific component values.
U.S.A:
TEL 619 674 8100
•
EUROPE:
TEL 441 483 428 877
•
ASIA:
TEL 886 7 821 3141
•
WEB:
http://www.pulseeng.com
T633.A (1/98)
ISDN S-INTERFACE
TRANSFORMERS
Surface Mount, Single, 1.5 and 3 KVrms
Longitudinal Balance Test Circuit
HP-8751A
Network Analyzer
Out
R
A
B
Pri
VT
EL
ISM-1
Sec
ISM-1 = Wandel and Goltermann
Signal Balance Ratio Bridge
Terminating
Resistor
Safety Standards Recognition
The following regulatory organizations, both national and inter-
national, have issued standards relevant to the safety of equip-
ment that is connected to the telecom network:
IEC950
– International Standard
EN60950
– European Standard
UL1950
– American Standard
AS3260
– Australian Standard (Austel)
All these documents are close derivatives of the IEC950, with
any national deviations spelled out in the respective national
standards.
Four levels of insulation are considered: operational, basic, sup-
plementary and reinforced. It is the type of equipment, its use
and application (including the working voltage), which determine
the level of insulation to be applied.
Pulse’s transformers
T5024, T5025
and
T5026
comply with the
reinforced insulation requirements of IEC950 and have been
certified by BABT (certificate number CRC30) and Austel (certifi-
cate number E726609).
T5036
Certificate Pending.
balance compensates for some circuit AC unbalance, and
assures compliance of the system with I.430 on longitudinal
conversion loss (LCL) and signal balance. This is accomplished
by a well AC-balanced winding configuration whereby the
capacitive coupling between primary and secondary windings is
evenly distributed. Also, both halves of the lineside winding are
well balanced.
The transformers meet the following LCL specifications:
10 KHz to 300 KHz :
54 dB minimum
300 KHz to 1 MHz:
Minimum value decreasing from
54 dB at 20 dB / decade
Definition of Terms
Ratio
– This is the turns ratio, expressed as “Primary:
Secondary”. The term “CT” designates center-tapped winding.
OCL
– Open circuit inductance, measured 20 KHz,100 mV.
L
L
Sec
– Leakage inductance measured across the secondary
with the respective primary winding short circuited.
C
W/W
– Winding capacitance, formed by the primary and sec-
ondary wire. These wires form the “plates” of this capacitor.
Measured at 100 KHz, 20 mV.
CD Pri
– This is the distributed capacitance.
DCR
– This is the resistance of the windings when measured in
DC conditions.
∆
I
DC
– The maximum specified unbalanced DC current capability
of the device.
The minimum primary inductance and the maximum distributed
capacitance satisfy the transmitter output and receiver input
impedance requirements of CCITT I.430 for both TE and NT.
The maximum distributed capacitance allows sufficient margin
for the capacitance of the IC and a protection diode network.
It is consistent with the overall maximum value specified and the
permitted length of the basic access TE cord.
Flammability
Materials used in the products are recognized UL 94-VO.
Products meet IEC 695-2-2 requirements (needle flame test).
Longitudinal Balance for Transformers
The longitudinal conversion loss specification in I.430 includes a
test setup which is intended for system evaluation, whether TE
or NT. Such a test is performed with DC current present. The
transformer plays an essential role in achieving the required bal-
ance. However, all other elements in the circuit should also be
designed to provide the highest possible symmetry. These ele-
ments include the protection circuitry, series resistors, chip
transmitter output and receiver input, as well as the cables used
and the TE cord where applicable. A high level of transformer
For More Information :
Corporate
12220 World Trade Drive
San Diego, CA 92128
Tel: 619 674 8100
FAX: 619 674 8262
http://www.pulseeng.com
Quick-Facts: 619 674 9672
Europe
Millpool House
Mill Lane, Godalming
Surrey GU7 1EY
U.K.
Tel: 441 483 428 877
FAX: 441 483 416 011
Asia
P.O. Box 26-11, KEPZ
6 Central Sixth Road
KEPZ, Kaohsiung
Taiwan, R.O.C.
Tel: 886 7 821 3141
FAX: 886 7 841 9707
Distributor
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
names mentioned herein may be trademarks or registered trademarks of their respective owners.
Printed on recycled paper. ©1998, Pulse Engineering, Inc.
T633.A (1/98)
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