Miniature Token Ring Transceiver Module EPT7061GM ELECTRONICS INC. • Ideal for DTR Application with PHY Chip E.G. TI380C60 • • Optimized for 120Ω • • Recommended for UTP or STP Transmission • • Complies with or exceeds IEEE 802.5 Requirements • Electrical Parameters @ 25° C Impedance Insertion Loss (dB) [Xmit/Rcv] Chip Side 1-16 MHz Max. 150 32 MHz Min. Return Loss (dB Min.) 36 MHz Min. 1-6 MHz 44 MHz Min. 6-17 MHz Common Mode Rejection (dB Min.) 17-25 MHz 1-30 MHz 30-100 MHz 100-200 MHz Crosstalk (dB Min.) 200-300 MHz 1-16 MHz Cable Side Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv Xmit Rcv -.8 120 -7 -.8 -7 -25 -25 -25 -25 -16 -16 -16 -16 -9 -55 -9 -55 -50 -50 -40 -40 -30 -30 -45 Schematic 5 1 7 3 150 Ω Xmit Filter 4 120 Ω 8 2 Chip Side Cable Side 15 9 13 150 Ω 120 Ω Rcv Filter 14 10 16 12 Package Dimensions A J Pin 1 I.D. N PCA EPT7061GM Date Code B Pad Layout Q D M E C K L H PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 P F Dim. Min. A B C D E F G H I J K L M N P Q .980 .365 .390 --.010 --.500 .018 .008 --0° .025 --------- (Inches) Max. Nom. 1.00 .385 .410 --.020 --.520 .022 .012 --8° .045 --------- .990 .375 .400 .700 .015 .100 .510 .020 .010 .145 --.035 .040 .100 .055 .540 (Millimeters) Min. Max. Nom. 24.89 9.27 9.91 --.254 --12.70 .457 .203 --0° .635 --------- 25.40 9.78 10.41 --.508 --13.21 .559 .305 --8° 1.14 --------- 25.15 9.53 10.16 17.78 .381 2.54 12.95 .508 .254 .368 --.889 1.02 2.54 1.40 13.72 I G CST7061GMa Rev. 3 1/18/99 Product performance is limited to specified parameters. Data is subject to change without prior notice. TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com Miniature Token Ring Transceiver Module EPT7061GM ELECTRONICS INC. The circuit below is a guideline for interconnecting PCA’s EPT7061GM with a typical Token Ring PHY chip for 4 Mb/16Mb applications over STP or UTP cable. Further details of system design should be obtained from the specific chip manufacturer. Note that this module is optimized for a “voltage source” driver such as TI380C60. Only one type of cable should be driven by the module: either UTP or STP. Note that the two channels have identical filtering and other magnetics . This option is seen to be widely used by system designers when designing dedicated Token Ring systems. The pull down resistors to chassis via a cap shown around the RJ45 connector have been known to suppress unwanted radiation that unused wires pick up from the immediate environment. This is specially true if driving UTP cable. Their placement and use are to be considered carefully before a design is finalized. No specific recommendation is made here for phantom return circuitry: implementation varies. Please note that additional emission control has been observed if both nodes of the phantom bypass capacitor on the transmit channel are pulled to the chassis ground via suitable capacitors. It is recommended that there be a neat separation of ground planes in the layout. It is generally accepted practice to limit the plane off at least 0.05 inches away from the chip side pins of EPT7061GM. There need not be any ground plane beyond this point. For best results, PCB designer should design the outgoing traces preferably to be 50Ω (UTP), balanced and well coupled to achieve minimum radiation from these traces. Typical Application Circuit Connection to TI380C60 (or Equivalent). Only NIC side shown. 150Ω Rcv- Rcv+ PH-B +5V PH-A +5V 2 7 4 1 8 5 3 9 3 4 10 6 RJ45 Xmit± 1 50Ω/2W PHOUTA Rcv± 2 7 8 14 50Ω/2W PHOUTB 10µF 13 10µF Xmit+ 100Ω Xmit100Ω 442Ω DTR PHY 15 EPT7061GM 16 Notes : 1. Pins 3 & 4 are left unconnected. Applications vary. Your system may have a phantom drive return detection circuit needing pins 3 & 4 to be connected separately. PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 CST7061GMb Rev. 3 1/18/99 TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com