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Keywords: transformers, turns ratio, inductance, primary winding, secondary winding, isolation voltage, Pulse Engineering, Halo Electronics, Bel Fuse, Coev Magnetics, Tyco

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APP 351: Sep 17, 2007

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APPLICATION NOTE 351

T1/E1 and T3/E3 Transformer Selection Guide

Abstract: This application note lists vender transformers that meet the specifications required for use with Maxim Single-Chip Transceivers (SCTs) and Line Interface Units (LIUs). Recommended transformers are made based on the following transformer specifications: turns ratio, primary inductance, leakage inductance, interwinding capacitance, and DC resistance for both 5V and 3.3V operation. Actual results are dependant on the integrity of the PCB design and other termination circuitry and should be verified by the customer.

Introduction
This application note applies to the following products:

T1/E1 LIUs T1 SCTs E1 SCTs T1/E1 SCTs T1/E1 Ethernet/Serial TDM T3/E3 LIUs T3/E3 SCTs

DS2148 DS2151 DS2153 DS2156 DS33R11 DS3150 DS3170

DS21348 DS2152 DS2154 DS2155 DS33R41 DS3151 DS3171

DS21Q48 DS21352 DS21354 DS21Q55 DS3152 DS3172

DS21Q348 DS21552 DS21554 DS21455 DS3153 DS3173

DS21448 DS21Q552 DS21Q554 DS21458 DS3154 DS3174

DS2149 DS21Q352 DS21Q354 DS26502 DS3251 DS3181

DS21349 DS2196 DS21Q59 DS26503 DS3252 DS3182

DS26303 DS21Q58 DS26504 DS3253 DS3183

DS26324 DS21Q50 DS26518 DS3254 DS3184

DS26334 DS26519 DS32504

DS26521 DS32506

DS26522 DS32508

DS26524 DS32512

DS26528

Table 1 shows the specifications for our 5V devices and Table 2 shows the specifications for our 3.3V devices. The specifications for selecting an appropriate transformer are given in the data sheets for each device and repeated below for simplicity. Table 3 lists the transformer part numbers from multiple vendors and matches them with the parts listed above.

Table 1. Transformer Specifications for 5V Operation

Specification Recommended Value

Turns Ratio, 5V Applications 1:1 (RX) and 1:15 or 1:1.36 (TX) ±5%

Primary Inductance 600µH minimum

Leakage Inductance 1.0µH maximum

Interwinding Capacitance 40pF maximum

Transmit Transformer DC Resistance

Primary (Device Side) 1.2Ω maximum

Secondary 1.2Ω maximum

Receive Transformer DC Resistance

Primary (Device Side) 1.2Ω maximum

Secondary 1.2Ω maximum

Table 2. Transformer Specifications for 3.3V Operation

Specification Recommended Value

Turns Ratio, 3.3V Applications 1:1 (RX) and 1:2 (TX) ±2%

Primary Inductance 600µH minimum

Leakage Inductance 1.0µH maximum

Interwinding Capacitance 40pF maximum

Transmit Transformer DC Resistance

Primary (Device Side) 1.0Ω maximum

Secondary 2.0Ω maximum

Receive Transformer DC Resistance

Primary (Device Side) 1.5Ω maximum

Secondary 1.2Ω maximum

Table 3. Transformer Part Information

Vendor Part Turns Ratio No.
of Ports Package Type No.
of Pins Temp
Range Hierarchy Maxim Device

Pulse PE-65388 1:1.15CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

PE-65586 1:1.36CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554

PE-65351 1:2CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

PE-64936 1CT:1 RX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

PE-65565 1:1.15CT and 1:2CT 1 Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TX1315 1CT:1CT RX only Surface Mount 6 -40°C to
+85°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554

TX1320 1CT:1.36CT TX Only Surface Mount 6 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554

TX1277 1CT:1CT and 1CT:2CT 1 Surface Mount 14 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59, DS33R11, DS33R41

PE-68882 1CT:1.15CT and 1CT:1CT 1 Surface Mount 14 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

PE-64952 1:2CT and 1:1.36 1 Through Hole 14 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554

PE-64953 1:2CT and 1:2CT 1 Through Hole 14 0°C to
+70°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

PE-65865 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

T1076 1:1.15CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

T1136 1CT:1CT and 1CT:1.36CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554

PE-68678 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

PE-68877 1CT:1CT and 1CT:2CT 1 Surface Mount 12 -40°C to
+85°C T1/E1 DS33R11, DS33R41

T1094 1CT:1CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

TX1099 1CT:1:0.8 and 1CT:1:0.8 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21348, DS21Q348, DS21448, DS26502, DS26503, DS26504, DS26521, DS26522, DS33R11

TX1467 1CT:1:1 and 1CT:1:1 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

TX1473 1:2 and 1:1 4 Surface Mount 32 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

T1068 1:2CT and 1:1CT 4 Surface Mount 40 0°C to
+70°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

TX1475 1CT:1CT and 1CT:2CT 4 Surface Mount 32 -40°C
to
+85°C T1/E1 DS26324, DS26334, DS26518, DS26519, DS26524, DS26528

T1114 1CT:1CT and 1CT:2CT 4 Surface Mount 40 -40°C to
+85°C T1/E1 DS26303

T1108 1:2CT and 1:1CT 4 Surface Mount 40 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

TX1292 1:1.36 and 1:1 4 Surface Mount 40 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554

PE-65968 1:2CT RX or TX Surface Mount 6 0°C to
+70°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184, DS3251, DS3252, DS3253, DS3254

PE-65969 1:2CT RX or TX Through Hole 6 0°C to
+70°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3170, DS3171, DS3172, DS3173, DS3174, DS3181, DS3182, DS3183, DS3184

T3002 1:2CT RX or TX Surface Mount 6 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

T3012 1:2CT RX or TX Surface Mount 6 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

T3021 1:2CT and 1:2CT 1 Surface Mount 16 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

T3047 1:1 4 Surface Mount 32 -40°C to
+85°C T3/E3 DS32501, DS32502, DS32503, DS32504, DS32512

T3049 1:2 4 Surface Mount 32 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3170, DS3171, DS3172, DS3173, DS3174, DS3181, DS3182, DS3183, DS3184

HALO Electronics TG38-1505A 1:1.15CT TX only Through Hole 6 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TD70-1205A 1:1.36CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TD15-1205A 1:2CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

TD02-1205A 1CT:1 RX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

TG04-1505NS 1CT:1CT RX only Surface Mount 6 -40°C to
+85°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

TG15-1505NS 1CT:2CT TX only Surface Mount 6 -40°C to
+85°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

TG38-1505NS 1:1.15CT TX only Surface Mount 6 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TG70-1505NS 1:1.36CT TX only Surface Mount 6 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TD63-1505D 1:1.15CT and 1:2CT 1 Through Hole 14 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TG63-1505N1 1:1.15CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TG35-1505N1 1CT:1.15CT and 1CT:1CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

TGSP-1467N1 1CT:1:1 and 1CT:1:1 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

TG28-1505N1 1CT:1CT and 1CT:1.36C 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554

TG74-1205N1 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

TG83-S006NU 1:2 and 1:1 4 Surface Mount 32 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

TG74-1205N1 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

TG07-0206NS 1:2CT TX or RX only Surface Mount 6 0°C to
+70°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154

TD07-0206NE 1:2CT TX or RX only Through Hole 6 0°C to
+70°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154

TG07-0356NS 1:2CT TX or RX only Surface Mount 6 0°C to
+70°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154

TG07-0406N1 1:2CT and 1:2CT 1 Surface Mount 16 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154

TG05-0206NU 1:2 4 Surface Mount 32 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154

Bel S553-3855-02 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

S553-0013-02 1:2CT and 1:1.36 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554

S553-0013-01 1CT:2CT and 1:1 1 Surface Mount 16 0°C to
+70°C T1/E1 DS21352, DS21354, DS2148, DS2155, DS2196, DS21Q352, DS21Q354, DS21Q48

S554-3184-01 1:2CT 1 Surface Mount 6 0°C to
+70°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

0554-3184-01 1:2CT 1 Through Hole 6 0°C to
+70°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

S553-6500-H5 1CT:1:1 and 1CT:1:1 4 Surface Mount 32 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21554, DS21Q552, DS21Q554

S554-6500-21 1:2 4 Surface Mount 32 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

S553-6500-C8 1:2 and 1:1 4 Surface Mount 32 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

0553-0013-RC 1:1.15CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

0553-0013-BC 1CT:1 RX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

0553-0013-1J 1:2CT and 1:2CT 1 Through Hole 14 0°C to
+70°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

0553-0013-2J 1:2CT and 1:1.36 1 Through Hole 14 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554

T2099S 1CT:1CT and 1CT:1.36CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554

T2006 1:1.15CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

T2007 1:1.36CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554

T2028S 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

T0034 1:2CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

S553-6500-76 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354

S553-6500-E6 1CT:1CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS21348, DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

S553-6500-H6 1CT:1:0.8 and 1CT:1:0.8 1 Surface Mount 32 -40°C to
+85°C T1/E1 DS21348, DS21Q348, DS21448, DS2155, DS2156

Coev PT-311 1:1.36CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554

PT-311ET 1:1.36CT TX only Through Hole 6 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554

PT-306 1:2CT TX only Through Hole 6 0°C to
+70°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

PT-306ET 1:2CT TX only Through Hole 6 -40°C to
+85°C T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59

PT-312 1CT:1 RX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

PT-312ET 1CT:1 RX only Through Hole 6 -40°C to
+85°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

PT-323 1:1 RX only Through Hole 6 0°C to
+70°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

PT-323ET 1:1 RX only Through Hole 6 -40°C to
+85°C T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554

SMD601-05 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

SMD601-05ET 1:1.15CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554

SMD606-05 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C T1/E1 DS21352, DS21354

SMD606-05ET 1CT:1CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C T1/E1 DS21352, DS21354

SM01-T304M 1:2CT 1 Surface Mount 6 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

MGBBT-00019 1:2 4 Surface Mount 32 -40°C to
+85°C T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184

T1/E1 and T3/E3 Transformer Selection Information
If you have further questions on T1/E1 or T3/E3 transformer selection for our devices, please contact the Telecommunication Applications support team by email at , or call 01-972-371-6555. For more information about specific transformers, please consult the manufacturers using the information listed below.

Vendor List

Address Phone Fax Website

Pulse Engineering Inc.
12220 World Trade Drive
San Diego, CA 92128 858-674-8100 858-674-8262 www.pulseeng.com

HALO Electronics Inc.
1861 Landings Drive
Mountain View, CA 94043 650-903-3800 650-903-9300 www.haloelectronics.com

Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302 201-432-0463 201-432-9542 www.belfuse.com

Coev Magnetics (Tyco)
3003 9th Avenue SW
Watertown, SD 57201 605-886-3326 605-884-3640 www.coev.net

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(PDF, 744kB)

DS21Q348 3.3V E1/T1/J1 Line Interface Full Data Sheet
(PDF, 792kB)

DS21Q352 Quad T1/E1 Transceiver (3.3V, 5.0V) Full Data Sheet
(PDF, 176kB) Free Samples

DS21Q354 Quad T1/E1 Transceiver (3.3V, 5.0V) Full Data Sheet
(PDF, 176kB) Free Samples

DS21Q48 5V E1/T1/J1 Line Interface Full Data Sheet
(PDF, 1.1MB)

DS21Q50 Quad E1 Transceiver Full Data Sheet
(PDF, 784kB) Free Samples

DS21Q55 Quad T1/E1/J1 Transceiver Full Data Sheet
(PDF, 1.4MB)

DS21Q552 Quad T1/E1 Transceiver (3.3V, 5.0V) Full Data Sheet
(PDF, 176kB) Free Samples

DS21Q554 Quad T1/E1 Transceiver (3.3V, 5.0V) Full Data Sheet
(PDF, 176kB) Free Samples

DS21Q58 E1 Quad Transceiver Full Data Sheet
(PDF, 656kB)

DS21Q59 E1 Quad Transceiver Full Data Sheet
(PDF, 664kB)

DS26521 Single T1/E1/J1 Transceiver Full Data Sheet
(PDF, 1.7MB) Free Samples

DS26522 Dual T1/E1/J1 Transceiver Full Data Sheet
(PDF, 1.9MB) Free Samples

DS26524 Quad T1/E1/J1 Transceiver Full Data Sheet
(PDF, 2.4MB) Free Samples

DS26528 Octal T1/E1/J1 Transceiver Full Data Sheet
(PDF, 1.9MB) Free Samples

DS3150 3.3V, DS3/E3/STS-1 Line Interface Unit Full Data Sheet
(PDF, 716kB) Free Samples

DS3151 Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs Full Data Sheet
(PDF, 696kB) Free Samples

DS3152 Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs Full Data Sheet
(PDF, 696kB) Free Samples

DS3153 Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs Full Data Sheet
(PDF, 696kB) Free Samples

DS3154 Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs Full Data Sheet
(PDF, 696kB) Free Samples

DS3181 Single/Dual/Triple/Quad ATM/Packet PHYs with Built-In LIU Full Data Sheet
(PDF, 3.6MB)

DS3182 Single/Dual/Triple/Quad ATM/Packet PHYs with Built-In LIU Full Data Sheet
(PDF, 3.6MB) Free Samples

DS3183 Single/Dual/Triple/Quad ATM/Packet PHYs with Built-In LIU Full Data Sheet
(PDF, 3.6MB)

DS3184 Single/Dual/Triple/Quad ATM/Packet PHYs with Built-In LIU Full Data Sheet
(PDF, 3.6MB) Free Samples

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Download, PDF Format (78kB)
AN351, AN 351, APP351, Appnote351, Appnote 351