ICS556-01 datasheet(2/6 Pages) ICST

2 / 6 page

MDS 556-01 B

Revision 020204

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Broadcom 25 MHz LVDS Clock

ICS556-01

Pin Assignment

Pin Descriptions

External Component Selection

The ICS556-01 requires a minimum number of external

components for proper operation. A 100

Ω termination

resistor between CLK and CLK is provided on-chip.

Decoupling Capacitors

A decoupling capacitor of 0.01

µF should be connected

between VDD and GND on pins 2 and 3 as close to the

ICS556-01 as possible. For optimum device

performance, the decoupling capacitor should be

mounted on the component side of the PCB. Avoid the

use of vias in the decoupling circuit.

LVDS Driver Termination

A general LVDS interface is shown in Figure 2. In a 100

differential transmission line environment, LVDS drivers

require a matched load termination of 100 across near

the receiver input. For a multiple LVDS outputs buffer, if

only partial outputs are used, it is recommended to

terminate the un-used outputs.

VDD

GND

CLK

I C S 556- 01

8 P i n ( 1 73m i l ) T S S O P or SO I C

CLK

GND

Number

Name

Type

Pin Description

Input

Crystal connection.

VDD

Power

Power supply. Connect to 2.5 V.

GND

Power

Connect to ground.

GND

Power

Connect to ground.

5CLK

Output

Inverting differential clock output.

CLK

Power

Differential clock output.

Input

Output Enable. Internal pull-up resistor.

Input

Crystal connection.

F I G URE 2 . T Y P I CA L LVDS

DRIVE R TE RMINATIO N

100 ohm

2.5V

100 Ohm Differential Transmission Line

LVDS_Driver

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