TM1485FVB2 datasheet(7/12 Pages) PULSE

7 / 12 page

Pin number(s)

1, 28 . . . . . . . .

The positive supply for the line interface module. Connect to +5.0V for PECL applications,

and to Gnd for ECL applications.

2, 3

. . . . . . . .

DO , DO: Differential ECL data outputs. These outputs can drive 50 ohm loads connected to VCC

–2.0V. Recommend 330 ohms to Gnd.

7, 8

. . . . . . . .

Gnd (VEE): The negative supply for the line interface module. Connect to Gnd for

raised ECL (PECL) applications, and to –5.2V for standard ECL applications.

13, 14 . . . . . . . .

RX-, RX+ : Transformer coupled differential inputs to receiver section. For coax applications, RX-should

be connected to shield of cable/earth Gnd; RX+ should be connected to the center conductor. Earth

Gnd should be AC coupled to DC signal Gnd using a 0.027 µF capacitor, ~500V.

15, 16 . . . . . . . .

TX+ , TX- : Transformer coupled differential outputs to cable. For coax applications, TX- should be

connected to shield of cable/earth Gnd; TX+ should be connected to the center conductor. Earth Gnd

should be AC coupled to DC signal Gnd using a 0.027 µF capacitor, 500V.

21, 22 . . . . . . . .

Gnd (VEE): The negative supply for the line interface module. Connect to Gnd for

raised ECL (PECL) applications, and to –5.2V for standard ECL applications.

. . . . . . . .

VBB : Is an output pin, which is used for biasing up a threshold reference level, i.e. PECL (3.67V).

This pin can only source 1 mA maximum.

24, 25 . . . . . . . .

DI, DI : Differential ECL compatible data inputs to the transmitter side of the module.

4, 5, 6, 9, 10, 11, 12, 17,

18, 19, 20, 26, 27 . .These pins are "no connect;" do not apply Gnd, VCC, or signal lines to these pins.

Module Pinouts

Board Layout Considerations

0.1 µF capacitors should be ceramic and placed as close

to the VCC pins (1 & 28) of the transceiver as possible.

Differential lines should be of equal length.

Data out and signal detect output lines should be as short

as possible and isolated from noisy sources.

Controlled impedance traces from pins 14 (RX+) and 15

(TX+) of the transceiver to the BNCs or DB9 connector

must be used in order to control return loss.

A DC signal ground plane should occupy the complete

area directly beneath the transceiver LIM from pins 1-2

and 17-28.

TWO PEARL BUCK COURT

BRISTOL, PA 19007-6812

TEL 215-781-6400

FAX 215-781-6403

www.pulsespecialty.com

Fibre Channel Module — 7

PULSE SPECIALTY COMPONENTS

The earth ground plane should occupy the complete area

directly beneath pins 13-14 and 15-16.

There should be a separation of 0.050" between earth

and DC ground.

The earth ground should be AC coupled to DC ground

with a 0.027 µF capacitor on both sides of the

transceiver (TX side and RX side).

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