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Data Sheet
January 1998
T7256 Single-Chip NT1 (SCNT1) Transceiver
Lucent Technologies Inc.
57
Application Briefs
(continued)
T7256 Reference Circuit
(continued)
Table 29. T7256 Reference Schematic Parts List
(continued)
1. Kemet is a registered trademark of Kemet Laboratories Company, Inc.
2. Philips is a registered trademark of Philips Manufacturing Company.
3. Vitramon is a registered trademark of Vitramon, Inc.
4. Hewlett Packard is a registered trademark of Hewlett-Packard Company.
5. Polyswitch is a registered trademark of Raychem Corporation.
6. Bel and Bel Fuse are registered trademarks of Bel Fuse, Inc.
7. Molex is a registered trademark of Molex, Inc.
8. Pulse Engineering is a registered trademark of Pulse Engineering, Inc.
9. Dale is a registered trademark of Dale Electronics, Inc.
10.Valor is a registered trademark of Valor Electronics, Inc.
11.Advanced Power Components is a registered trademark of Advanced Power Technology, Inc.
12.Vacuumschmelze is a registered trademark of Vacuumschmelze GmbH.
Reference
Designator
R14, 15
Description
Source
Part #
SMC Resistor,
1.1 k
, 2 W, 5%
SMC Resistor,
75
, 1/8 W, 1%
SMC Resistor,
46.4
, 1/8 W, 1%
SMC Resistor,
100
, 1/8 W, 1%
ISDN U-interface
Transformer
Dale
WSC-2
R16, 17
Dale
CRCW120675R0F
R20—23
Dale
CRCW120646R4F
R24—27
Dale
CRCW12061000F
T1
Lucent
2754H2
Alternates (See footnote at the end of this table.):
Lucent 2754K2 (1500 Vrms breakdown)
Lucent 2809A (for EN60950 compliance)
Valor
10
PT4084 (619) 537-2500
Midcom 671-7759 (605) 886-4385
PE65498
Alternates:
Pulse Engineering PE-68988 (single transformer, rein-
forced insulation)
Valor PT5048 (619) 537-2500 (pin compatible)
Advanced Power Components
11
, LTD.
APC40498 (pin compatible)
APC2050S (single transformer, reinforced insulation)
US: Terry Manton, Inc. (rep), (201) 447-8821
Europe: 44-634-290588
Vacuumschmelze
12
(VAC) (single transformer,
reinforced insulation)
T60403-L4097-X017-80
U.S.: (908) 494-3530
Europe: 49-6181-38-2026
T7256
T2
ISDN S-Interface
Dual Transformer
Pulse
Engineering
(619) 674-8100
U1
Single-chip NT1 IC,
44-pin PLCC
Optocoupler
Lucent
U2
Hewlett
Packard
Lucent
HCPL-0701
U3
ISDN dc Termina-
tion IC
LH1465AB