W89C92 Ver la hoja de datos (PDF) - Winbond

Número de pieza

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Lista de partido

W89C92

TRANSCEIVER FOR COAXIAL CABLE (TCC)

Winbond 

W89C92

PCB Layout Guidelines

(1) VDD and VSS should be connected to ground and a -9V DC copper plane, respectively, to dissipate

the power heat. The overlapped power and ground copper plane form a coupling capacitor that can

decouple high frequency noise on the power line. The -9V DC and ground must be as close as

possible to VDD and VSS of the W89C92 to reduce line inductance. A good power plane layout will

improve the MTBF of the W89C92.

(2) The trace between the coaxial cable and RXI and the isolating diode should be made as short as

possible. All the metal traces and the copper plane should be as far as possible from the RXI trace. A

longer RXI trace will induce more shunt capacitance loading, while closer traces induce larger

capacitance. This extra capacitance may overload the coaxial cable beyond the 2 pF stated in the

IEEE 802.3 specification. The RXI trace should be made as thick as possible to reduce the line

inductance. The maximum length of the RXI trace, 4 cm, is recommended.

A Cheapernet MAU implementation with the TCC

+

5V

_

DC to DC

Converter

1.5K Each

9V (Isolated)

+

−

COAX

1

16

2

15

4

13

5

12

7

10

8

9

CSO+

1

CSO-

2

CLS

16

TXO

15 1N4148

DI+

3

W

8

RXI

14

VSS

9

4C

13 VSS

9

VSS

52

ER-

12

DI-

T

C

ER+ 1 k 1%

6 C 11

DO+

7

VDD

10

DO-

8

SQE

9

- 10 -

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