REV 1.1.9 1/30/03

Characteristics subject to change without notice.

1 of 26

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X9521

Fiber Channel / Gigabit Ethernet Laser Diode Control for Fiber Optic Modules

BLOCK DIAGRAM

DATA

REGISTER

COMMAND

DECODE &

CONTROL

LOGIC

SDA

SCL

CONSTAT

REGISTER

PROTECT LOGIC

EEPROM

THRESHOLD

RESET LOGIC

4

2 kbit

8

7 - BIT

NONVOLATILE

MEMORY

WIPER

REGISTER

COUNTER

WP

8 - BIT

NONVOLATILE

MEMORY

WIPER

REGISTER

COUNTER

ARRAY

©2000 Xicor Inc., Patents Pending

Hot Pluggable

Dual DCP, EEPROM Memory

DESCRIPTION

The X9521 combines two Digitally Controlled Potentiome-

protection. All functions of the X9521 are accessed by an

industry standard 2-Wire serial interface.

The DCP’s of the X9521 may be utilized to control the bias

and modulation currents of the laser diode in a Fiber Optic

module. The 2 kbit integrated EEPROM may be used to

store module definition data.

The features of the X9521 are ideally suited to simplifying

the design of fiber optic modules which comply to the Giga-

bit Interface Converter (GBIC) specification. The integration

of these functions into one package significantly reduces

board area, cost and increases reliability of laser diode

modules.

FEATURES

• Two Digitally Controlled Potentiometers (DCP’s)

—100 Tap - 10k

Ω

—256 Tap - 100k

Ω

—Non-Volatile

—Write Protect Function

• 2 kbit EEPROM Memory with Write Protect & Block

• 2-Wire industry standard Serial Interface

—Complies to the Gigabit Interface Converter (GBIC)

specification

• Single Supply Operation

—2.7V to 5.5V

• Hot Pluggable

• Packages

—CSP (Chip Scale Package)

—20 Pin TSSOP

Preliminary Information